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04-11-2013, 12:17 AM | #1 |
Scooby Newbie
Member#: 225423
Join Date: Oct 2009
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New ID850 injectors, uneven trims
I put ID850 injectors in my 2008 STi.
Before this, my trims were all zero, and under boost the target fueling was dead on with a wideband. So I'm pretty sure my MAF tuning is good. Now with the ID850's, I can't get both the trims and the open loop to line up. ID publishes the latentices for the injectors. If I put these in, I need a flow scaling of ~800cc/min to get nice even 0% trims. However, then under boost it runs about 10% rich. I'm only boosting the wastegate pressure of 13PSI for my turbo right now. If I put in 885cc/min, which is what the injectors are rated at, I get perfect AFR's under boost, but my cruise trims are off up to 10% (the ECU is adding fuel under cruise). The weird thing is that the trims add more fuel as my MAP goes to less vacuum, so I'd think a vacuum leak would need more fuel added at idle, not at near 0 vacuum. This could just be the latentcy being of a touch though. I've checked for a vacuum leak, but I can check again.. Is there anything but a leak that could cause this issue? Am I missing anything but injector scaling and latentcies?
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04-11-2013, 07:59 AM | #2 |
Scooby Specialist
Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:07 STI Limited TurboMike Tuned 2.35 |
The problem is your thinking about it too much :-)
You can tune so many ways... Tune the injectors for 0 trim for ol target or in the middle. Put 850 start the car. If it says it's taking out 15 points just go to the maf table. Select all and press the minus button 10 times, restart and try again. When you get the idle set that way I t should be pretty close on the ol table. Ol is just an additive that should hit the target afr in that table... Nothing to worry about if you have 10.5 and it hits 11.5.. The Ecuflash guys and romraider guys just made it target afr to make it easier for people to interpret. Send me a pm if you have more questions. |
04-11-2013, 11:03 AM | #3 |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
Probably some non-linearity with those injectors, or some non-linearity with the stock injectors that was being compensated for with the MAF scaling that's now fighting the linearity of the IDs.
Yes, theoretically, you shouldn't need to touch the MAF scaling or load compensations when changing injectors, but 90% of the time you do. Also make sure you've adjusted tip-in and per-cyl fueling compensations as well. |
04-11-2013, 05:26 PM | #4 |
Scooby Specialist
Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:07 STI Limited TurboMike Tuned 2.35 |
Good catch. Per cylinder fueling tables first, then go through the quick steps I gave above and you should be set.
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04-13-2013, 12:04 AM | #5 | |
Scooby Specialist
Member#: 217563
Join Date: Jul 2009
Chapter/Region:
South East
Location: Eden NC
Vehicle:2006 Sti 12.68 @ 108 321WHP 422WTQ dynojet SAE |
Quote:
Last edited by bswilmington; 04-13-2013 at 02:10 AM. |
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04-13-2013, 12:50 PM | #6 |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
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04-14-2013, 01:47 AM | #7 |
Scooby Specialist
Member#: 193412
Join Date: Nov 2008
Chapter/Region:
RMIC
Vehicle:1985 pumas. white |
Mulitply your Tip-ins by .54 the whole table. Also try 823.05CC/Min for your injector scale that's a 7% reduction off of your cruise. It should drop your +/- 3% cruise. if your having a hard time hitting the targets with the stuff above shown. Adjust the injector latency down further. Or to ID's Spec page which is
8V 2.280 10v 1.54 12v 1.14 14v .91 16v .73 |
04-15-2013, 11:09 PM | #8 |
Scooby Specialist
Member#: 193412
Join Date: Nov 2008
Chapter/Region:
RMIC
Vehicle:1985 pumas. white |
Or the other thing to do is to rescale your MAF
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04-16-2013, 08:03 AM | #9 |
Scooby Specialist
Member#: 323908
Join Date: Jun 2012
Chapter/Region:
MWSOC
Location: Dayton Ohio
Vehicle:2013 BRZ ltd ISM |
Yeah because it seems like you are only having issues at one end of the spectrum or the other, if tweaking latencies doesnt help you, then you may just need to push correction to the low end, and tweak the low end of your MAF scaling to get where you want to be. I say the low end, because you can usually get away with it on the low end without making a jagged MAF curve like you would if tweaking the top end sometimes. (You can feel the jagged curve in a pull if it is bad enough)
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