ECU boost control
Jan 14, 2010, 11:14 AM
#31
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Haven't touched the pump, and I swapped relays with the headlight relay this morning with no change in behavior.
Bryan, I am not arguing but would to know how the ecu knows the pump is failing during WOT, I thought it was open loop?
I haven't touched the pump, but I guess I can check the filter, soon as I find it
Bryan, I am not arguing but would to know how the ecu knows the pump is failing during WOT, I thought it was open loop?
I haven't touched the pump, but I guess I can check the filter, soon as I find it
I take it you checked your FPR vac line, any lines to the induction tube post MAF, etc etc?
The pump fuel filter is contained within the white plastic pump assembly and is almost impossible to check visually.
- bryan
Jan 14, 2010, 11:22 AM
#32
It doesn't know the pump is failing, but if the pump is slacking on fuel delivery, the injectors have to pick up the slack and try to spray more fuel to reach target, which will increase the IDC.
I take it you checked your FPR vac line, any lines to the induction tube post MAF, etc etc?
The pump fuel filter is contained within the white plastic pump assembly and is almost impossible to check visually.
- bryan
I take it you checked your FPR vac line, any lines to the induction tube post MAF, etc etc?
The pump fuel filter is contained within the white plastic pump assembly and is almost impossible to check visually.
- bryan
Can you tell me what typical load and IDC would be for my setup?
I'm still confused as I thought open loop meant the ecu doesn't have a feedback loop to adjust IPW during WOT.
Based on the other thread and this thread I will check for:
Large exhaust leaks
Intake leak on intake tube.
I really don't want to pull the pump, If I do I'll just replace the sucker.
Jan 14, 2010, 11:26 AM
#33
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Yea usually if it's the relay it goes much leaner.
You can try dropping the boost 2-3 psi from 5500 to 7k and see what your IDC's and AFR do. If the IDC's drop and AFR's fall in line then I would say possible pump going. I see this with the OEM pump when I start reaching the max of them or if they start failing.
Your little drop to 9.X in your fuel table 6000 plus in the 200-240 range is odd. Have you tried "leaning" out that area and see what your IDC's do like Tephra suggested?
In open loop it goes off the fuel map and does whatever it can to hit the fuel map target. If it needs to increase fuel delivery at the injectors to meet that target, it will, up until the injectors go static.
Your load looks correct but your IDC's do not. On 91, with richer AFR because of it, I start seeing the stock injectors max out a little over 300whp on our dyno and it usually takes full turboback no cat, open filter, etc to do that, just like the Evo 9's.
- bryan
You can try dropping the boost 2-3 psi from 5500 to 7k and see what your IDC's and AFR do. If the IDC's drop and AFR's fall in line then I would say possible pump going. I see this with the OEM pump when I start reaching the max of them or if they start failing.
Your little drop to 9.X in your fuel table 6000 plus in the 200-240 range is odd. Have you tried "leaning" out that area and see what your IDC's do like Tephra suggested?
In open loop it goes off the fuel map and does whatever it can to hit the fuel map target. If it needs to increase fuel delivery at the injectors to meet that target, it will, up until the injectors go static.
Your load looks correct but your IDC's do not. On 91, with richer AFR because of it, I start seeing the stock injectors max out a little over 300whp on our dyno and it usually takes full turboback no cat, open filter, etc to do that, just like the Evo 9's.
- bryan
Last edited by GST Motorsports; Jan 14, 2010 at 11:28 AM.
Jan 14, 2010, 11:31 AM
#34
Yea usually if it's the relay it goes much leaner.
You can try dropping the boost 2-3 psi from 5500 to 7k and see what your IDC's and AFR do. If the IDC's drop and AFR's fall in line then I would say possible pump going. I see this with the OEM pump when I start reaching the max of them or if they start failing.
Your little drop to 9.X in your fuel table 6000 plus in the 200-240 range is odd.
In open loop it goes off the fuel map and does whatever it can to hit the fuel map target. If it needs to increase fuel delivery at the injectors to meet that target, it will, up until the injectors go static.
- bryan
You can try dropping the boost 2-3 psi from 5500 to 7k and see what your IDC's and AFR do. If the IDC's drop and AFR's fall in line then I would say possible pump going. I see this with the OEM pump when I start reaching the max of them or if they start failing.
Your little drop to 9.X in your fuel table 6000 plus in the 200-240 range is odd.
In open loop it goes off the fuel map and does whatever it can to hit the fuel map target. If it needs to increase fuel delivery at the injectors to meet that target, it will, up until the injectors go static.
- bryan
6000 and up fuel map was my attempt to richen A/F and see if it actually worked, as you can see..no go
You are sure are I couldn't be maxing out the injector though right? Cause If I am I am willing to get some DW1000's.
Last edited by tsitalon1; Jan 14, 2010 at 11:50 AM.
Jan 14, 2010, 11:46 AM
#35
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I'm done lol....... No way you are maxing them IDC% out with your setup. Change your pump and let be in past man... Might as well upgrade your pump while you are there. Just think about it man it will just be another mod then not a repair lol.
Man in the 6 months of having my X (Never owned evo before or tuned new cars) I sure have learned and learning a lot from people on here. Good luck man!
Man in the 6 months of having my X (Never owned evo before or tuned new cars) I sure have learned and learning a lot from people on here. Good luck man!
Oct 12, 2010, 05:52 AM
#36
Seems like have the same problem here on Evo x sst with 3" full exhaust system, complete ams intercooler pipe set, 18psi boost @7000 rpm and 11.2 afr, pump gas. The IDC is near 100% ~97% which so high ?!
With a simple fuel pump upgrage can we turn up the boost with a GM 3 port till 20psi what the stock Evo X turbo can push redline ?
With a simple fuel pump upgrage can we turn up the boost with a GM 3 port till 20psi what the stock Evo X turbo can push redline ?
Oct 12, 2010, 08:01 AM
#37
Seems like have the same problem here on Evo x sst with 3" full exhaust system, complete ams intercooler pipe set, 18psi boost @7000 rpm and 11.2 afr, pump gas. The IDC is near 100% ~97% which so high ?!
With a simple fuel pump upgrage can we turn up the boost with a GM 3 port till 20psi what the stock Evo X turbo can push redline ?
With a simple fuel pump upgrage can we turn up the boost with a GM 3 port till 20psi what the stock Evo X turbo can push redline ?
You need injectors.
Also, the stock turbo will max around 18-19 at redline. At least, that is what most people can achieve, there are always a few freak cars out there that can hold 20.
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