• Hello Guest, welcome to the initial stages of our new platform!
    You can find some additional information about where we are in the process of migrating the board and setting up our new software here

    Thank you for being a part of our community!

Regina to LH 2.4 Swap

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
 
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.
 
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
 
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
 
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?
 
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
 
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
 
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.
 
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
 
Looking at this as I'd like to add a turbo to the NA Regina wagon. I didn't find the referenced Regina +T thread in previous searches, so I'll link it here in case anyone else comes looking:

500dollar744ti's 740/940 Regina +T
 
Going to rewire the Regina to LH2.4 for my +T. Regina +T works, however the AFR's are very uneven and LEAN under light boost (14's @ 2-3psi), then pig rich under heavier pedal. I want the motor to last more than a couple years, and to be able to run regular turbo boost pressure. I'll add specifics to this thread for anyone else who may still be interested.
 
Last edited:
Working on comparing the 91 LH, EZK, Regina & Rex wiring diagrams - using Stiggy's spreadsheet as my base document (many, many thanks, Mike jr)

Once I start, I will photograph in tedious detail every step :oogle:

There are several differences compared to the 940 base he was going from, so I noted all the changes in yellow. In some cases the wiring is the same, that were different for him

Screen-Shot-2022-06-19-at-9-17-13-AM.png


Screen-Shot-2022-06-26-at-10-32-41-PM.png
 
Last edited:
Keep forgetting to include a parts list. I'll edit it for part numbers. Adding TRB reference links where relevant to discussion/research. I'm including all the items that are involved - some may be useable as is/with mods (e.g. Regina fuel rail)

Bosch coil VO 1346071. Bosch 0221118351
Bosch coil wire VO 3531277
Power stage & heat sink VO 3501921
shielded wire
Knock sensor (same)
CPS (same) VO 271949 3547847. Bougicord 146404
60/1 Flywheel VO 6842012 6842013 (don't know which of the two is correct, both list 700/900 F/T model range)
EZK 116 ECU 0 227 400 207 VO 6842449

EV1 Injectors ...357, (greens) 0280150804 VO 3517283
Injector ballast
or; EV6 Injectors:
(reds) 0280155759 VO 9454556 30lb LPT. (whites) 0280155766 VO 9454557 33.3lb HPT. (blues) 0280155830 VO 9186060 34lb HPT
FPR 3517064 3 bar. Bosch 0280160294
LH fuel rail
MAF. VO 3517020. 8251497 Bosch 0280212016
O2 sensor VO 3501753 Bosch 13957
IACV VO 1389618 Bosch 0280140516
ECT (same?). VO 1346030
TPS (same?). VO 3517068 Bosch 0280120301 0280120325
LH2.4 ECU. 0 280 000 954 VO 6842448

Regina fuel pump replacement
 
Last edited:
Back
Top