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Old 11-26-2017, 08:05 AM   #1
Steerfromdarear
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Default anyone using stock ecu for t5 rwd

Anyone using the stock ecu for t5 rwd conversion.im fitting a 2.5 t5 to a 740 was thinking of using the standard ecu what power can you get with standard ecu and what's involved. Thanks for any help
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Old 11-27-2017, 10:10 AM   #2
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Originally Posted by Steerfromdarear View Post
Anyone using the stock ecu for t5 rwd conversion.im fitting a 2.5 t5 to a 740 was thinking of using the standard ecu what power can you get with standard ecu and what's involved. Thanks for any help
How much power do you want? There are various parties that tune M4.3 and 4.4 and will do so based on your specs.

But wouldn't adapting the T5 ecu and harness be roughly the equivalent work of using a stand alone?

Anyway, here are some good links to start off with...

https://ozvolvo.org/discussion/2503/...-4-pre-99-x70s
http://m44.wikia.com/wiki/M44_Wiki
http://www.ardideas.com/850-_c_135.html
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Old 11-27-2017, 01:53 PM   #3
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I use a original ecu ..but as soon as you start adding boost you need to tune the ecu
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Old 11-27-2017, 01:59 PM   #4
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also worth considering if you want to keep stock engine management
http://vasttuning.com/coil-on-plug/
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Old 11-27-2017, 02:50 PM   #5
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link to my build (955 conversion )
http://www.turbobricks.org/forums/sh...d.php?t=327048
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Old 11-27-2017, 05:01 PM   #6
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Was looking for 300-350 I may use aftermarket ecu
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Old 11-27-2017, 06:18 PM   #7
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Was looking for 300-350 I may use aftermarket ecu
then use a VEMS you get a ecu, fuse box, relys and the whip, everything you need for less than 1000 pounds.
Have a look at http://engdahlmotorsport.se/VEMS/Priser.html kit #2 includes all you will need, you even get a start map
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Old 11-27-2017, 07:41 PM   #8
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also worth considering if you want to keep stock engine management
http://vasttuning.com/coil-on-plug/
Thanx for that! I couldn't remember it earlier.
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Old 11-28-2017, 06:24 AM   #9
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Was looking for 300-350 I may use aftermarket ecu
Awesome! Should be fun. Do you already have a turbo picked out?

According to Vast, a 20T will get you there. 22T's are available as well. OTOH, people are claiming to have made 340 with 19T's. They may also have done some other things. NA cams and/or NA intake manifold with a 960 throttle body.

Then there are 9 blade and 11 blade turbines that will help extend the top end some.

Let us know.
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Old 11-28-2017, 06:52 AM   #10
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I don't really have anything decided yet .I'm unsure about the ECU seems using the standard ecu and modifying it seems to be as costly as going aftermarket
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Old 11-28-2017, 08:14 AM   #11
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I don't really have anything decided yet .I'm unsure about the ECU seems using the standard ecu and modifying it seems to be as costly as going aftermarket
The good thing about using a tuned OE ECU is that it's already tuned. At least you don't have to do it. I guess it's just a matter of where you want to spend your time.
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Old 11-28-2017, 12:16 PM   #12
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Join one of the t5rwd pages on FB (there are a few) you can find ecus for 50-120 pounds.
Just make sure that it is a stage 3 or 4, preferably a stage 4
A stage 4 is good for about 330hp and if you then want to up the HP you can use larger MAF and injectors ...and if you want to go even bigger you will need a fuel pressure regulator and raise the pressure to about 4bar and start playing around with MAF sizes

Im running 440cc@3bar injectors with a 76mm MAF on a stage 4 chip with 1.5bar of boost

If you have a ecu you can buy the chip https://www.blocket.se/goteborg/Trim....htm?ca=20&w=3 for about 100 pounds
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Old 11-29-2017, 12:04 PM   #13
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Great info thanks how do you get around the immobilizer
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Old 11-29-2017, 02:33 PM   #14
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Great info thanks how do you get around the immobilizer
That is a bit tricky ...you want to buy a ecu from 95 or earlier and it has to be from a turbo car , N/A cars had two ecus ...you might find a non immobilizer ecu on 96s too after that you will need the emmobilizer and the keys that match it ...I happen to have one lying about BUT as I have no idea how to graft it in to the whip and as I have not really bothered to check how to do it either its just been collecting dust.

Again have a look at FB heres a link to the page I spend some time on https://www.facebook.com/groups/476053072451385/
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Old 11-29-2017, 02:37 PM   #15
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If you choose to go with the "stock" ecu I can guid you throw the "how to" of hooking it up to the 740/940s electrics
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