Ecu problem?
28 October 2006, 01:23 PM
#1
Ecu problem?
Had my car rolling roaded in the summer and was quite happy it made 251bhp.
Its a 93 wrx with an Apexi ik, decat and an apexi backbox using the standard ecu (W6 240ps) and an IHI turbo of unknown spec.
I've just had it rolling roaded today and made 244bhp i was not happy.
The car specs are 93wrx ,apexi ik ,decat ,full exhaust and a Z4 ecu (260ps) and IHI turbo of unknown spec.
The operator informed my that the boost wasn't being held and the pickup was poor (eg summer run gave me 140bhp@3000 revs todays run 140bhp@3300) and the fuelling was all over the place and leaning out at high end revs.
Why is this?
I didn't expect a huge gain but definately didn't expect a drop.
Thanks for any help
Paul
Its a 93 wrx with an Apexi ik, decat and an apexi backbox using the standard ecu (W6 240ps) and an IHI turbo of unknown spec.
I've just had it rolling roaded today and made 244bhp i was not happy.
The car specs are 93wrx ,apexi ik ,decat ,full exhaust and a Z4 ecu (260ps) and IHI turbo of unknown spec.
The operator informed my that the boost wasn't being held and the pickup was poor (eg summer run gave me 140bhp@3000 revs todays run 140bhp@3300) and the fuelling was all over the place and leaning out at high end revs.
Why is this?
I didn't expect a huge gain but definately didn't expect a drop.
Thanks for any help
Paul
28 October 2006, 06:08 PM
#2
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I wouldnt be concerned about the figures to be honest as 7bhp is not a huge difference in my opinion. was it the same rolling road and was it run in identical condition, gear, tyre pressures etc as before?
What is concerning is it leaning out higher up the range. Try cleaning the maf, I tend to clean mine at least once a month, it amazes me how much it gets soiled (dirt/dust) through my induction kit (dry induction kit), be gently with it though. Also check for any loose hoses. (my 93 every now and again I have to pull the intercooler back towards the throttle body as I need some new jubilee clips and not got round to it yet)
What is concerning is it leaning out higher up the range. Try cleaning the maf, I tend to clean mine at least once a month, it amazes me how much it gets soiled (dirt/dust) through my induction kit (dry induction kit), be gently with it though. Also check for any loose hoses. (my 93 every now and again I have to pull the intercooler back towards the throttle body as I need some new jubilee clips and not got round to it yet)
28 October 2006, 06:18 PM
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My car with loads of mods and a 20G only just broke the 300 barrier at Triton today so i wouldnt worry too much about figures its all about what it drives like on the road IMO
28 October 2006, 11:14 PM
#4
Thanks for the replies but my main concern is that i've replaced my ecu with a more powerful version yet ran less power and f**ked up the fuelling.
Yes jaytc2003 it was the same rolling road, same gear, air temp different (summer now autumn) but the tyre pressure was different (50 in summer 40 today).
How do you clean the MAF as i've been told not to spray anything onto the sensor (this does seem a contetious point with the people i've spoken to)
Nice car by the way scooby-tc
Yes jaytc2003 it was the same rolling road, same gear, air temp different (summer now autumn) but the tyre pressure was different (50 in summer 40 today).
How do you clean the MAF as i've been told not to spray anything onto the sensor (this does seem a contetious point with the people i've spoken to)
Nice car by the way scooby-tc
29 October 2006, 10:24 AM
#5
sorry if the pictures are too big.
The first 2 are of the run on sat 28th with the Z4.
The second 2 are of the run without the Z4 in the summer.
Any help/advice would be greatfully received
Thanks
Last edited by myblackwrx; 29 October 2006 at 10:34 AM.
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30 October 2006, 09:04 AM
#9
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When I clean my maf, I either use compressed air (from a can so quite lowish pressure) or a lint free cloth to gently wipe the elements, be gentle though dont be hamfisted!!
01 November 2006, 12:27 PM
#11
If the 1st 2 plots above are the more recent run then the fuelling is rich, not lean. It's running approx 10.5AFR at 6800rpm which is quite rich and you WILL be loosing power.
from what I've seen of recent Triton RR days/plot. They run in 3rd not 4th, so you may not of achieved full boost. Also these other runs show a tendancy to also read rich.
As mentioned in one of the other posts above, I wouldn't worry about it too much.
from what I've seen of recent Triton RR days/plot. They run in 3rd not 4th, so you may not of achieved full boost. Also these other runs show a tendancy to also read rich.
As mentioned in one of the other posts above, I wouldn't worry about it too much.
02 November 2006, 09:22 PM
#16
IMHO, just changing the ECU for one from a more powerful model ( i.e. going to Z4 etc ) doesn't mean it will make your car faster / run better. If you haven't got the engine and ancillaries it expects - cams, turbo, air flow, exhaust, air filter, injector size etc. then it will be trying to run as best it can against what the ECU expects to be there, and will, within it's range, adjust to suit the currently fitted situation. Safety may go out ofthe window as the ECU thinks / sees a signal from say the MAF and puts fuel in to suit but if that is too little fuel as the induction system is not the same as it expects , them melt down!
But it's not a substitute for mapping the ecu to the exact engine system. A ScoobyECU or aftermarket ECU mapped will achieve so much more, and more safely! Then it will work with the engine poarts to get the best from them, and work within a safely set up range.
But it's not a substitute for mapping the ecu to the exact engine system. A ScoobyECU or aftermarket ECU mapped will achieve so much more, and more safely! Then it will work with the engine poarts to get the best from them, and work within a safely set up range.
02 November 2006, 10:06 PM
#17
A Z4 should improve and early WRX.
The Z4 map is basically the same map that Prodrive fitted to the UK cars. That certainly had no ill effects and is quite different to the standard UK map found in a V7 or 7D ECU.
Much like changing from a W6, U8, 2C ECU (240ps WRX) to a Z4 (260ps) WRX.
If it feels better on the road compared to the 240ps ECU, then ignore the RR figures above.
The Z4 map is basically the same map that Prodrive fitted to the UK cars. That certainly had no ill effects and is quite different to the standard UK map found in a V7 or 7D ECU.
Much like changing from a W6, U8, 2C ECU (240ps WRX) to a Z4 (260ps) WRX.
If it feels better on the road compared to the 240ps ECU, then ignore the RR figures above.
Last edited by Scott.T; 03 November 2006 at 08:36 AM.
02 November 2006, 10:27 PM
#18
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The operator informed my that the boost wasn't being held and the pickup was poor - Turbo is an IHI of unknown spec
Cheers
02 November 2006, 11:08 PM
#19
Interesting Delboy2 .. I am sure my OEM ECU was a W6 ( JDM import MY94 wagon ) and it had a TD04 ?
Apexi PFC now, super!
Scott, I concur, you know these maps, I was going on general principles.
Apexi PFC now, super!
Scott, I concur, you know these maps, I was going on general principles.
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