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View Full Version : Regina to LH 2.4 Swap


thelostartof
01-23-2013, 02:00 AM
Ok so I just spent some time looking over the wiring diagrams and as far as I can tell the only thing really different about the two is the wiring for the drivers side fender (MAP and Ign coil/powerstage for regina vs AMM/powerstage for LH (well coil wiring would go to other side). Both EZK and REX seem to use the same pins to go from Fuel->Ign and back.

Besides that everything else maps out to the same pins on each ECU. Does anyone happen to have both ECU's or wiring plugs that they can compare? I will if/when I find time to check out what I have stashed in the shed. I mean even the color's match for what pin they come out of the ECU. A rough look tells me I can just wire the MAP wiring to an AMM plug along with extend the Ign Coil wiring and then wire up and power stage. Once all of that is done besides swapping flex plate in my theory it should work. Since I already need to ditch the AW71L as it is slipping and has a converter that works when it wants to I have no problem putting an LH flexplate in there when I put in this late model AW71 in it.

Has anyone else done this?

Since my 'project' 1991 740 n/a (LH 2.4) is being sold to a friend that needs a car I need to rework my plans back to converting my regina car to LH so I can +T and enjoy it a bit more.

So yea there is my odd thinking for tonight, I will see if I can post the wiring I am looking at and ya'll can tell me how off I am.

Stiggy Pop
01-23-2013, 12:57 PM
I bought a '93 regina 940 on Sunday that I am considering +T'ing and swapping to 2.4. I'm going to be stripping down my wrecked 91 940t this weekend so I could be able to take a look at ecu's/connectors on both.

my regina car has a block mounted dist., is that typical?

thelostartof
01-23-2013, 01:01 PM
Regina cars can have block mount or head mount. I have owned both setups.

CaffeineSam
01-23-2013, 01:12 PM
Regina cars can have block mount or head mount. I have owned both setups.

Seriously ?

Could we swap in a head mounted distributor from a LH car and call it a day ?

2manyturbos
01-23-2013, 01:24 PM
Seriously ?

Could we swap in a head mounted distributor from a LH car and call it a day ?

Yes, and no. The Regina cars that came with the block mount distributor came that way because Volvo was using up the left over 240 engines. That would likely mean they have a non-slotted cam installed in them. I have never checked whether they do or not. Obviously, if they have the slot, or, if you swap the cam for one with the slot, you can change over to a head mount distributor.

Harlard
01-23-2013, 01:26 PM
The main reason I just traded the Regina car for an LH one was because I am too lazy to swap trannies and their respective flexplates :cool:

Kjets On a Plane
01-23-2013, 01:33 PM
Yes, and no. The Regina cars that came with the block mount distributor came that way because Volvo was using up the left over 240 engines. That would likely mean they have a non-slotted cam installed in them. I have never checked whether they do or not. Obviously, if they have the slot, or, if you swap the cam for one with the slot, you can change over to a head mount distributor.

^this.
Had several 1993 Reginas with a block mount dist. Some had slotted cams, some did not when I had them apart to check them out, adjust valves or do a headgasket.

The Regina does have some nasty intermittent bugs and that stupid coil (can be swapped for lh parts), but late model Regina cars 92-93+ are pretty reliable. As good or better on fuel Econ than the lh ones. Block mount dist real nice. Head mount is bean counter, annoying, leaky, costly, and idiotic.

+T a 7 series? People give away turbo ones, relatively abundantly.

thelostartof
01-23-2013, 01:39 PM
My reason for doing it is easier to +t.

Swapping the dizzy location does nothing for lh, lh needs the proper rpm wheel on the crank/ flex plate. So my plan is to redo wiring and swap flex plate when I am swapping transmissions. I can test the car without the trans hooked up so if it doesn't work quick and easy to put the Regina stuff back on.


Now to make sense of the last little bit of wiring and then find a weekend to do it.

CaffeineSam
01-23-2013, 01:49 PM
Yes, and no. The Regina cars that came with the block mount distributor came that way because Volvo was using up the left over 240 engines. That would likely mean they have a non-slotted cam installed in them. I have never checked whether they do or not. Obviously, if they have the slot, or, if you swap the cam for one with the slot, you can change over to a head mount distributor.

Yeah well my cam is a K slotted for a LH 2.2 engine so I guess I would be good. The original cam was non-slotted though.

What would you plug the distributor with for a test run though, that's another question altogether...

Sorry for derailing the thread OP.

CaffeineSam
01-23-2013, 01:55 PM
(...) that stupid coil (can be swapped for lh parts).

Come again ? I'm interested...

Plug in a power stage and a LH coil ?

My reason for doing it is easier to +t.

Swapping the dizzy location does nothing for lh, lh needs the proper rpm wheel on the crank/ flex plate. So my plan is to redo wiring and swap flex plate when I am swapping transmissions. I can test the car without the trans hooked up so if it doesn't work quick and easy to put the Regina stuff back on.


Now to make sense of the last little bit of wiring and then find a weekend to do it.

Doesn't LH need a hall sensor signal ?

thelostartof
01-23-2013, 01:58 PM
Yes that is what the flex plate / flywheel does n An lh 2.4 car. That is why there is an rpm sensor on the back of engine.

The lh2.4 distributors do not have the hall sensor in them like lh 2.2.

CaffeineSam
01-23-2013, 02:05 PM
Yes that is what the flex plate / flywheel does n An lh 2.4 car. That is why there is an rpm sensor on the back of engine.

The lh2.4 distributors do not have the hall sensor in them like lh 2.2.

Ah ! A pretty good idea...

Kjets On a Plane
01-23-2013, 02:28 PM
My reason

Swapping the dizzy location does nothing for lh, lh needs the proper rpm wheel on the crank/ flex plate. So my plan is to redo wiring and swap flex plate when I am swapping transmissions. I can test the car without the trans hooked up so if it doesn't work quick and easy to put the Regina stuff back on.


Now to make sense of the last little bit of wiring and then find a weekend to do it.
the right way would be to repair it so it is a clean na car and sell it to someone that just needs a car and buy a 7series turbo. That might make rational sense in the global 2012 economy, which is not the tb way.

The head mount dist would allow one to use stock coil and ignition wire set. Not that there is really any reference window for "right" here and it would not make any meaningful difference as far as crank angle sensing or spark triggering or distribution really.

The again a 7 series +T...yeah...not going to touch that...yikes.

thelostartof
01-23-2013, 03:07 PM
My 944 has a restored salvage title, ipd sways, near perfect grey/cloth interior, ecode headlights, s90 tails, less than two year old heater core i installed, new brakes and bushings and $400 worth of properly tinted windows. The only real flaw is the paint is coming apart and the transmission is in need of replacement one of these years as the lockup works when it wants to. Never mind the custom 4-2-1 header and full new exhaust I built for it along with the silicone cooling hoses and vac lines along with strut brace and under chassis brace. Never mind the new tires and wheel spacers with 850r wheels.

How much do you think your normal person would pay for that and what would be the cost to replace all of that plus find another car in as nice of shape as mine.

The rational thing to do is when swapping the transmission to swap the flex plate and re route maybe 7 wires to make the car lh 2.4 so I can easily turbo it with the custom manifold I am planning on building. As it will be the least amount of effort, time and money spent to have a 93+ turbo car vs buying one with leather or tan interior and swapping everything over or having to buy all of those parts new and install.

Unless 93+ grey/cloth interior turbo cars with all of those upgraded and new parts grow on trees in your area. Because if they do I would gladly trade mine for one from there.

aaron740gl
01-23-2013, 08:02 PM
I swapped from regina to lh 2.4. I ended up swappin the whole harness whivh was a big mistake. It became a nitemare of wiring diagrams and a bunch of "wtf". In the end i finally got it. Ended up swapping pins in the big bulkhead connectors on each side. I should have just swapped over the plugs like you plan on doing. Probably alot easier. I considered it, but got confused about some of the wires. Overall i got it done, and it runs good. Once i figured it all out, it sarted and ran, right off the rip, i installed B cam, swapped to block mount dizzy that has the vacuum adv. on there. It advances on its own and retards in boost and the ecu doesnt have a clue, it thinks its running perfect.

boostabear
01-23-2013, 08:10 PM
Watching this as my DD is a Regina 745, that runs great for now, but if something happens I wouldn't mind swapping it to LH2.4 and a simple +t.

aaron740gl
01-23-2013, 08:37 PM
I know someone here on tb +t'd regina. Maybe more than one person i dont know. I think there is another guy in arizona that has had good luck with boosting regina. I swapped to lh because nobody know much about regina.. Im sure with supporting mods one can make good power with regina, of course a wideband should be the first investment.

CaffeineSam
01-23-2013, 09:23 PM
500dollar740ti did it for pennies using the cold start injector.

740volvo allegedly pushed the enveloppe and ran up to 260 hp with a VAFC module and bigger injectors.

I'm going to try with a SMT-6, slightly bigger injectors and more crap.

LWCook
01-23-2013, 09:39 PM
^this.
Had several 1993 Reginas with a block mount dist. Some had slotted cams, some did not when I had them apart to check them out, adjust valves or do a headgasket.

The Regina does have some nasty intermittent bugs and that stupid coil (can be swapped for lh parts), but late model Regina cars 92-93+ are pretty reliable. As good or better on fuel Econ than the lh ones. Block mount dist real nice. Head mount is bean counter, annoying, leaky, costly, and idiotic.

+T a 7 series? People give away turbo ones, relatively abundantly.

In my experience, Regina absolutely has better fuel economy. I can back that up with data from 2 LH and 2 Regina cars. Regina ain't smart, but sometimes stupid plows ahead and gets the job done better.

thelostartof
01-23-2013, 10:56 PM
I just checked and LH and Regina use the same plugs, I need to validate the pinout and after that it sounds like my idea of just rewiring the Map to a AMM plug and then REX coil wires into power stage and coil, and with a proper LH flexplate it will be LH.

Motivation found.

lookforjoe
01-23-2013, 11:53 PM
Sounds like a solid plan. Regina blows. In our northeast climate, they had more problems than any other EMS. That coil setup is complete crap. The shop I do some work for has at least one customer that is determined to keep his Regina wagon, converting to 2.4 makes the most sense, if a tranny job or rear main is also upcoming....

Lord_Athlon
01-24-2013, 12:09 AM
lmk if yoou want a hand

boosted12a
01-24-2013, 12:48 AM
as a regina owner, i must say thnks! ive been kicking around the idea myself and trying to decide to keep my 940 or not. no +t here but was planning a worked head, headder along with the other stuff ive done. to get the most bang out of the parts i figure regina was gonna be a problem. plus for 2.4, the o2 sensor can be found for 39$

Kjets On a Plane
01-24-2013, 12:59 AM
I dunno shoot...got a 90 744ti m46 for 2400 with paperwork to new, braces, bars, new tires, solid engine no slap or leak down, 2.5" 2 straight thrrough muffler stainless exhaust system.

Maintained it with new used jy parts. A/c worked at the time. Needed a little a/c work to keep going.

Free car. Deals pop up up here and automatic ones are a dome a dozen even fixed up. Can't sell a perfect sedan for more than about 2000 hardly, maybe a skosh more to the right person with desire for a nice one. 7 series are so worthless though and he motor won't quit that people who have them got them for free and just get cheaper post purchase.

Stiggy Pop
01-24-2013, 11:29 AM
Who cares? Some people have have good cars that happen to be Regina and LH parts on hand or readily available. The thread is about regina>LH conversion not why you think it's easier to buy a T car.

I bought a very nice '93 940 NA last week because there are no clean 945T's anywhere around here.
so:
Clean, original 945 - $1300
+T/LH parts - Free.99

That's a lot less than $2400 and I'll take a '93 940 over a '90 740 any day.

boosted12a
01-26-2013, 12:45 AM
tru dat. especialy if you are in search of a certain color. +t/LH is way cheeper and easyer that a respray

Stiggy Pop
02-17-2013, 05:27 PM
Hey Mike, have you looked into this any further? I pulled the LH harnesses out of my wreck today and after doing so I'm very interested in not swapping harnesses on my regina car!

thelostartof
02-17-2013, 06:33 PM
If you have a harness you can swap just the wiring on the strut towers.

I will look into more and try the swap in a month or so when I swap trans on my Regina car.

15A
02-17-2013, 06:45 PM
This would be a great sticky to have someone do....ala the 240 Chrysler to Bosch swap.

My 93 945 is Regina....part of a Bosch harness is due to arrive tomorrow - once all is collected (harnesses, flywheel, ECUs, K-1 for the bullet heater, rum for me, etc) , mine is going 2.4 (FTW)....the hard way - everything from the fuse block on is being swapped - along with a nicer dash, etc.

boosted12a
04-15-2013, 12:59 AM
i just spent an hour or so looking at the wiring diagrams, my brain is scrambled and it looks like a pita. ignition dosent look to bad but the fuel side looks crazy. altho it dose look like it wouldnt be hard to convert to the powerstage and get away from that dam crazy coil

thelostartof
04-15-2013, 09:03 AM
As soon as I find my book I will post up the wiring diagram as everything is wired the same, only different is Map / Amm and then coil/coil

Mogly
04-15-2013, 09:28 AM
This is easy I did it for a customer, I have the wiring diagrams on alldata and the Volvo manual wiring diagrams
if anyone needs them PM you're emal.

Stiggy Pop
04-15-2013, 10:08 AM
As soon as I find my book I will post up the wiring diagram as everything is wired the same, only different is Map / Amm and then coil/coil

That seems like an over-simplification. There's quite a few things that would need to be repinned/moved, some wires repurposed to fill in blanks, and a wire needs to be added from pin 28 on the ECU to pin 4 on the EZK that's absent in Regina. I've started looking at this process with my Dad, it's doable but it's not a matter of moving a half dozen wires and being done.

I've got a matrix in excel that lays out the ECU pins Bosch>Regina and the EZK>REX, pin to pin what goes where and whether they are different or same. We are working on some step-by-step instructions as to what needs to be moved where etc. Just to give you an idea, from my first run through we found: for the ECU's there are 24 connections similar, 18 different. For EZK/REX it's much closer ~22 same, 4 different.

I would upload the matrix to google docs but I'm at work, anyone who's interested send me your email and I'll send it to you.

Mogly, sent you a pm would be interested in how you did it.

boosted12a
04-15-2013, 07:23 PM
yeah, definatly not a afternoon job. i could see doing it in a weekend after getting a plan of attack on the wires but. the lh system i hav is out of my 740 turbo, will the lack of the wot wire make things run funky?

thelostartof
11-03-2013, 08:08 AM
Ok so tell me what I am seeing wrong

LH
http://thelostartof.net/IMG_20131103_044558.jpg

Regina
http://thelostartof.net/IMG_20131103_044646.jpg

For LH
pin 17 from EZK goes to pin 1 of LH
pin 8 from EZK goes to pin 25 of LH
pin 4 from EZK goes to pin 28 of LH

For Regina
pin 17 from Rex goes to pin 1 of Regina
pin 8 from Rex goes to pin 25 of Regina
pin 4 from Rex goes to pin 28 of Regina

As for Map vs MAF looks like those wires are used for those things only so I just have to wire the correct pin to the correct location.

Rex vs EZK all of the pins on the left go to the same spots as EZK on the left, same on the right also.

I am seeing a lot of stuff matching. So someone show me points where it doesn't seem to match up as my brain is playing tricks on me I guess.

Besides swapping flex plates, and then rewiring the Map to a Maf and coil wiring . . . .

BassGuy
11-03-2013, 03:52 PM
It advances on its own and retards in boost and the ecu doesnt have a clue, it thinks its running perfect.

Pretty sure LH2.4 still fires when it wants to, regardless of where the distributor rotor is.

Stiggy Pop
11-04-2013, 02:23 PM
PM me your email so I can send you my file.

I saw the following as different between Regina and LH ECU's:

3
6
7
8
9
10
11
14
15
20
21
23
28
29
33

I THINK we mapped it out pretty well, may save you some time. Still looks doable, I just haven't had time to really think about it since I tried to size it up.

98T5
11-14-2013, 10:55 AM
call me stupid, but what does "LH" mean? :-(

BassGuy
11-14-2013, 11:20 AM
Shorthand for Luftmasse-Hitzdraht (Seriously). It's a version of Bosch's Jetronic engine management that uses a hot wire Air Mass Meter.

98T5
11-15-2013, 10:31 AM
Shorthand for Luftmasse-Hitzdraht (Seriously). It's a version of Bosch's Jetronic engine management that uses a hot wire Air Mass Meter.

So, how do I know if I got that or not? :wtf: I have a 93' 940. thanks

linuxman51
11-15-2013, 10:43 AM
do you have an airflow meter on the airbox? or do you have a little two wire sensor on the airbox?

spruill242
10-09-2014, 01:19 PM
Zombie thread...... How far did we get on this guys?

Stiggy Pop
10-09-2014, 01:45 PM
Zombie thread...... How far did we get on this guys?

I'm just farting around in my slow car still. I've had my head too far up the 242's tailpipe to give the 940 any love but I still like to think I'm going to do something eventually.

spruill242
10-09-2014, 02:09 PM
Roger that. Seems like Thelostartof was trying to get around swapping the whole wiring harness. Obviously that would be optimal. Looking at the schematics he put up there isn't "much" difference. You seem to think there's more than meets the eye...

thelostartof
10-09-2014, 02:14 PM
Lacking time.

But on paper it really looks easy as just a few wires should be all that is required to make it swap.

Ezk and ecu swap and then a few wires in engine bay and then sensors. Maddest part of swap is the flywheel/flex plate

boosted12a
10-09-2014, 02:39 PM
good luck! i looked at the scematics for a few days, looked like more than that. hope it works out tho.

Stiggy Pop
10-09-2014, 02:50 PM
good luck! i looked at the scematics for a few days, looked like more than that. hope it works out tho.

Yeah, I'd like to see it done. I should still have my pin-layout matrix if anyone gets motivated.

spruill242
10-10-2014, 09:11 AM
To be honest I haven't really looked at my car real hard to get an idea of the Regina harness and connections. If I come across an LH2.4 set-up I'll get more serious. I've rewired a couple LS harnesses. So I'm used to the headache you get from looking at these schematics for an extended period of time. I guess if I get motivated, I'll post up what I end up doing.

boosted12a
10-10-2014, 02:53 PM
hell, come pull the 2.4 harness out of the 740 im gonna scrap. ill donate it to a worth cause but i aint pullin it

Harlard
10-10-2014, 03:25 PM
Better to just pull a 240 harness. Soo much easier.

Stiggy Pop
10-10-2014, 03:33 PM
Better to just pull a 240 harness. Soo much easier.

Not when we're talking about 7/9's!

I've got an LH2.4 940t harness in a tub... not a chance in hell I'll ever love a 940 enough to swap that sumbitch :rofl:

spruill242
10-10-2014, 04:32 PM
hell, come pull the 2.4 harness out of the 740 im gonna scrap. ill donate it to a worth cause but i aint pullin it

I just might have to do that.... When are you scrapping it?

boosted12a
10-14-2014, 06:30 PM
after this weekend. i still have a few parts i need to pull. this sunday would probbaly be best

spruill242
10-15-2014, 10:07 AM
Damn I gotta work. Thanks for the offer. I'll wait for one to show up in the yard.

boosted12a
10-15-2014, 06:14 PM
ok. well if i dont get it scrapped next week ill let you know.

rcdude
11-11-2015, 03:06 AM
Year old bump! anyone ever complete the swap?
Got a complete car 940t ready to swap into a 740 na

rcdude
11-14-2015, 04:20 PM
Year old bump! anyone ever complete the swap?
Got a complete car 940t ready to swap into a 740 na

bump:nod:

CT740Turbo
09-22-2016, 10:05 PM
What wires did you re pin

Porterhausen
06-05-2017, 10:04 PM
Going to start this nightmare myself in a few months, surprised to not find any good info on it. Have a complete running 92 turbo 740 that's in rough shape, just picked up a clean 93 940 that's regina. I plan on just swapping harnesses personally but we'll see what happens.

Drenman
06-07-2017, 10:06 AM
I'm VERY new to tuning, and not young but I've got the bug bad.

I've had 15 redblocks, mostly 945s, a 960, 240s and an '01XC, and all were just cars I fit in really well during a LONG 17 years of medical hell/spinal rare disease at 6'5" with the legs of a 5'8" man, and the spine of 7'10" my love of Bricks came from how well they treated my spine. My knowledge base has strictly been on keeping them running in stock configuration, but after a divorce, and not dying, I'm sort of a kid again, and my Son is bonkers for hot rodding, and fast cars...at 5&1/2 yrs old too.

Now my mid life crisis is making some bricks fly.
Presently I have 2 940s, both N/A one is a Regina, that I honestly hate as someone in the previous thread mentioned, the NorthEast, the difference in parts, vacuum lines, different relays, one fuel pump, I don't notice ANY fuel econ but the motor could use a rebuild, etc. and the exhaust is on there just as a mild engine noise dampener and to appear as if I've really got one. It's got Bar's stop leak in it, running fine, and needs a lot of work on the peripherals.

My '01XC is the only other car and it's got a blown trans. But I've thought about taking the regina and dropping the 2.4 LPT in there... what's the learning curve? I can do just about anything I set my mind to, and do it well, with some help here and there.

I'm rebuilding the head on my Bosch 940, lowered, N/A IPD VX cam... but when that's done, and the goop from the head gasket patch in the system is cleaned out that worked o.k. for a year, I should be o.k. on that in 2 weeks or so.

I was toying with rehabbing the Regina and selling it, I can clean it up WELL. But I think a 2.4L LPT would be awesome.

Why is the Regina the "choice" for this one, or is it just what's on hand for the O.P.?
I'd need the schematics and steps for this one, but I have Volvo Mech friends, and you guys as well...

Ryan_R
06-12-2017, 01:47 PM
Easier to swap cars than to swap Regina to LH. The roadblock I ran into was that some of the wires LH/EZK uses to the power stage are shielded... whereas they are not in Rex/Regina. It gets to be a headache fast, as the 7/9's use a single harness for pretty much everything. Soo.... I just put the Regina flex plate between the B234 and AW72 and called it a day back in 2012. Works fine.

I suspect Regina is good for 150-170HP out of the box. There's a write up on how to +T Regina. If you want to LH, just use a 240 harness.

Regina is nice for N/A. Parts are dirt cheap. Much rather spend $30 for a new MAP sensor every quarter million miles than deal with -016 AMM's.

LH is much more flexible.

-Ryan

Deathbye30
07-03-2017, 06:56 PM
Has anyone made any progress on this? or still have their ecu pin out ideas? I'm really tempted to purchase a 91 940t parts car.
And I currently have a 90 740 na 5 speed. that would love a turbo 2.4lh.

Ryan_R
07-04-2017, 08:24 AM
Has anyone made any progress on this? or still have their ecu pin out ideas? I'm really tempted to purchase a 91 940t parts car.
And I currently have a 90 740 na 5 speed. that would love a turbo 2.4lh.

There's an article on turbo-ing Regina here on TB. You should be able to add enough boost to break the 5-spd M47.

To me, the brickwall in the Regina-LH swap is that EZK wants some shielded wires where there are none in the Regina harness. You'll also need to swap the Regina flywheel for an LH. There was a time that a Regina flywheel could be sold for big bucks.

Easiest way to LH a Regina car is probably still to use a 240 harness, or one of the conversion harnesses used in the EU to ditch Motronic.

Another option is to go MegaSquirt. IIRC, Jeep Rennix(sp?) uses the same flywheel pattern as Rex-Regina.

-Ryan

bobxyz
07-04-2017, 12:25 PM
If shielded cables are the only problem, you can find short lengths of one or two conductor cables at: https://www.diyautotune.com/product/wire-2-core-shielded-22-gauge-10-39/

For EZK116, the crank position sensor wires are shielded, and maybe the knock sensor. For these, you could add shielded cables and splice them in next to the EZK connector.

Stiggy Pop
07-04-2017, 12:27 PM
Here's the pin matrix I did a few years ago then never did anything with

https://docs.google.com/file/d/0B_LBSR-F6k0yOGpiQ19uVDFYV2c/edit?usp=docslist_api&filetype=msexcel

Ryan_R
07-04-2017, 01:01 PM
Regina uses same knock and crank sensors, so no worries there. The wiring to the power stage is where the shielding is needed.

To be fair, if one is really going to do this, you're hacking out and swapping in big chunks of underhood harness anyway. The donor harness is probably adequately shielded where needed.

-Ryan

Airik
03-06-2020, 01:21 AM
ressurecting this once again! if i was to get a complete wiring harness, the sensors and the computers i should be good yeah?
or is there something im missing?

Ryan_R
03-06-2020, 09:38 AM
ressurecting this once again! if i was to get a complete wiring harness, the sensors and the computers i should be good yeah?
or is there something im missing?


Pretty much! I'd get a complete donor car. Unlike a 240, the 7/9's have basically one harness... so it's a big job.

-Ryan

Airik
03-10-2020, 02:21 AM
can you use harness from a 240? or does it have to be 7/9 specific? i only askc ause i have a full harness from a 240 already in my garage

bobxyz
03-10-2020, 09:04 AM
Yes, you should be able to use a 240 harness - see https://forums.turbobricks.com/showthread.php?t=230687
You'll need to run some extra wires between the 240 harness and your existing fuel pump / fuses / dash gauges, and you'll need to mount the ECU and EZK in the passenger footwell. I've not done this, so I don't know how it turns out compared to all the effort of swapping the 740/940 harness pieces.

Ryan_R
03-11-2020, 09:54 AM
Wiring diagrams are your friend. The rub with the 7/9 harness is that the whole car's wiring is basically integrated into a single harness for all intents and purposes. Thus, changing from Regina to Bosch requires the whole dash harness to be swapped. It's a huge job.

When I put a B234 in the Regina 745 ten years ago, I had looked into simply "re purposing" the Regina wiring and connect the ends to LH ECU/ICU and sensors. The Regina harness lacks some shielded wires for the ignition power stage.

In short easiest way to go is to use the 240 harness, and plug it into the places where it needs to interface with "the car". Dave Barton may have a lead on a European outfit that was building LH2.4 conversion harnesses for folks looking to ditch Motronic.

-Ryan