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Old 09-14-2013, 04:34 AM   #1
johan84
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Member#: 214663
Join Date: Jun 2009
Default Vw beetle sti engine conversion jdm ecu problems

Hello

I have an vw beetle wirh a uk spec sti engine and a jdm ecu engine and ecu are v7 sti

I have the car running and driving very good up to aout 4000 rpm and 50% throttle when i want more power it drops dead and misfire
I check a lot of thing
The intake is complete leak free fuelpressure is good lambda afr is good
I had to switch some wiring in de loom to ger de jdm exu workng on the uk loom
I have no fault codes and if i get a sensor off i get a fault so it works
Is there some body who has the experience swapping a jdm sti ecu on a usdm or uk europe model loom and engine it is like something is blocking

I have a speedsignal and the neutral switch is off so it is in gear all the time
I have read that the jdm sti injectors go for 565cc
Uk and europe are 550cc or something are the the same
Are there any differents in the engine that can make it run bad on a jdm sti ecu
I'm runnnng on 100 oct fuel because timing of jdm is more advanced

Some own any idea



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Old 09-14-2013, 09:47 AM   #2
Vlad
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Member#: 46135
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: NY
Vehicle:
02 WRX
Sti V9 Spec C

Default

If you have the proper ECU for your engine, with the immobilizer and keys, run that.
Then get a tactrix cable.
Then log your problem, post the logs and someone will help you with the tune.
You don't need the JDM ECU, to run a lot of timing, if this is what you're looking for.
You need a proper tune and lots of logging, to make sure the engine doesn't knock.
You can for instance start with the factory tune from the JDM Sti ECU and set the values in a UKDM ECU to match.
The program in the JDM ECU is known and copies of it (ROM) are available allover, on the net.
SO you can have the proper ECU and eliminate any compatibility problem, then start with the JDM program (ROM) and then customize it to where you have all the benefits of it, safely adjusted for your application.
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Old 09-15-2013, 04:05 AM   #3
johan84
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Member#: 214663
Join Date: Jun 2009
Default

Engine is running rich yesterday i logged the afr and with half throttle i hit

Afr 1-11.

I have a apexi power intake and there is also a sort o air bending plate in between the filter and maf that is bending the air to the maf but oem intake has no bending plate
So i think there is the rich running coming from
I will try today with the plate removed
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Old 09-15-2013, 11:13 PM   #4
BarnFab
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Join Date: Sep 2013
Default

What sort of fuel system are you running ?

Is it getting plenty of pressure consistently ?
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Old 09-16-2013, 05:40 AM   #5
johan84
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Member#: 214663
Join Date: Jun 2009
Default Maf reading also high

Yes fuel pressure and delivery is good is al oem

Yesterday i measured the maf value and it is giving 273g/s at 5000 rpm with 1,27 bar boost

At my opinion this about 30% to much it needs to be around 180 g/s
Can anyone confirm this?

I still have a very rich burn

I think the maf is broken
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Old 09-19-2013, 12:25 PM   #6
johan84
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Member#: 214663
Join Date: Jun 2009
Default new maf installed and fixed

yesterday made a test run with a new maf and it runs great know
so problem fixed
so normally a broken maf is given a lean mixture bud not always
mine was giving a very rich one
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Old 09-27-2013, 01:10 PM   #7
RonW
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Member#: 103663
Join Date: Dec 2005
Location: S.F Bay Area
Vehicle:
1968 Porsche 912
STi v8 Spec-C conversion

Default

glad to hear the problem was fixed. i would still take Vlad's advice however and get a Tactrix cable and then datalog with Romraider application so you aren't missing anything else. Once you learn the app, it is quite easy to use. lots of online tuners that don't charge much and can get you car running perfectly by simply logging and emailing the rom files back and forth until it runs perfectly.
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Old 09-27-2013, 05:57 PM   #8
johan84
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Member#: 214663
Join Date: Jun 2009
Default ecutek tuner

i have not much time this period
and want it to run good for the winter so going
next month to a ecutek tuner here in holland to
let it look at the mapping and adjust it if needed
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