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Old 10-20-2007, 11:28 AM   #1
nhat
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Default enginuity log questions

i started logging yesterday but for some reason, the logs i wanted to post didn't get saved. here are the values i managed to save though:

*these are max values of 3rd gear pulls from 2k rpms to redline
injector duty cycle - 108%
knock correction - 5
maf - 268g/s
wastegate duty cycle - 75
air/fuel correction - 25
air/fuel learning - 15
boost/manifold relative pressure - 19psi
iam - 1

the one thing that stands out to me is my IDC. before i installed the aps cai, my maf was reading 220g/s and is now reading 268g/s. IDC before aps cai was ~80% and is now an alarming 108%. i haven't touched my ecu since the street tune my friend and i did which was several months ago.

my guess is that the cai is making me run rich, which in turn is screwing up the IDC? would running rich cause the IDC to go up by that much? i have a wbo2 that needs to be installed this weekend so my friend can tune for the cai.
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Old 10-21-2007, 12:10 AM   #2
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Old 10-21-2007, 12:51 AM   #3
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If hope this isn't too simplistic but, it seems as if you're flowing more air (which the MAF seems to show) so, you need to flow more fuel. I don't think the CAI is causing you to run rich, I think it's flowing enough air that you're maxing out your injectors to make the desired AF.

I imagine if you were running stock injectors and boost, the built in headroom on a stock setup would compensate automatically for the increased flow.

I've got to say, seeing numbers like that make me want to get a CAI.

I'm a tuning Noob but, some of your numbers look pretty scary. The IAM of 1 makes me think your ECU's seeing knocking. Mine's 15-16. 100+% IDC makes me think you're going to be running dangerously lean. The before CSV doesn't work.

Last edited by MasterKwan; 10-21-2007 at 01:03 AM.
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Old 10-21-2007, 01:02 AM   #4
nhat
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what i'm wondering is how a tune with the cai will affect the injector duty cycle. if they're still maxed out after the tune or higher than 95%, it's off to andrewtech to have them modded.

hopefully with the wbo2 installed, i can lean out the mixture and see how that affects the injectors. i'm kind of hoping the injectors will stay maxed out so i have a reason to have them modded and throw in a fuel pump!
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Old 10-21-2007, 01:22 AM   #5
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Yeah...assuming you don't pop your motor first. I'd be scared to get my injectors over 90%.

https://secure.buschurracing.com/cat...oducts_id=1018

These guys claim that their CAI doesn't affect MAF scaling. If the APS one does affect it, then the MAF numbers you're seeing might just be wrong. If they're wrong then only a WB will tell you if you're running dangerously lean or not. That IAM would worry me too.
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Old 10-21-2007, 02:31 AM   #6
Broxma
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In theory, most CAI should make the car run lean I think, not rich. Larger inside diameter pipe vs. stock would allow more air than stock but the ECU would still be fueling for the stock diameter pipe.

I notice your running an 04 STI and have just been looking at some logs for another 04 STI I flashed a map on. The IDC is relatively high it seems on that car. I'm not sure it is isolated to that model, but even running 17 PSI on one, I saw IDC in the high 90's. Another 04 STI owner told me he has IDC over 110 in some logs which, yes, seems insane to me, but whatever, it's his car and not my tune.

I don't think it's the CAI though, rather the map.

Side note Kwan/All.
STI IAM calculation is different. 1.0 is good on that car. Check out the enginuity forum for IAM calculations and you'll see why. If it dropped to .8, then he should be seeing knock but 1.0 is fine.

/Brox
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Old 10-21-2007, 09:24 AM   #7
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my friend, who street tuned my car, also has an 04 sti. he's got a turboback and typhoon, and is now tuning for meth injection. with meth injection, he's seeing IDCs like mine.

so i'm not sure why the addition of a cai would make my IDCs go into overdrive! i know more air flow means more gas being pumped into the motor, but 25-30% more??? i'm going to take it easy until he and i can get the wbo2 in and tune for the new intake!

the aps cai i have is the 65mm unit so it shouldn't have any negative effects on maf scaling.
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Old 10-21-2007, 09:41 AM   #8
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Yeah, I've been studying 16 bit ECU's. I assume this one's a 32 bit DBW ECU?

I looks like a significant increase in airflow so, I'm not really surprised that you see a significant increase in fueling requirements. 220->268 = 21% increase?
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Old 10-21-2007, 10:24 PM   #9
nhat
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Quote:
Originally Posted by MasterKwan View Post
Yeah, I've been studying 16 bit ECU's. I assume this one's a 32 bit DBW ECU?

I looks like a significant increase in airflow so, I'm not really surprised that you see a significant increase in fueling requirements. 220->268 = 21% increase?
yeah the 04+ usdm sti has 32bit ecu's from what i know. the 25-30% i quoted was from the logs of IDC, which went from ~80% to ~110%
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Old 10-23-2007, 11:40 PM   #10
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Quote:
Originally Posted by nhat View Post
i started logging yesterday but for some reason, the logs i wanted to post didn't get saved. here are the values i managed to save though:

*these are max values of 3rd gear pulls from 2k rpms to redline
injector duty cycle - 108%
knock correction - 5
maf - 268g/s
wastegate duty cycle - 75
air/fuel correction - 25
air/fuel learning - 15
boost/manifold relative pressure - 19psi
iam - 1

I would say to quite simply lower your boost. Your knocks are way to high for starters. Also assuming you have a 32 bit ecu than you are ok with an iam of 1...if you have a 16 bit ecu than you are screwed. Try turning the boost down to 16 and then see what happens, or you can upgrade your fuel system. personally when my car displayed similar numbers it was because of boost being way to high.
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Old 10-24-2007, 01:16 AM   #11
Broxma
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I'm a tad lost when you say his knock is too high. the value 5 isn't knock it's knock correction which on a 16 bit ECU like an 03 WRXwould be Knock Correction = (Timing Advance Max * (IAM/16)) + feedback correction + fine correction learning.

I think on an STI you would remove the 16 and get Knock Correction = (Timing Advance Max * IAM) + feedback correction + fine correction learning. So basically if his IAM is 1 his timing advance is 5, which is actually not high at all.

I know on my 03 I normally see KC of 9 which by my calculation would be KC=(9.14*(16/16)=9

I think your confusing the two is all.

Biggest problem with your logs is there is no Throttle position which is really helpful IMO. Alot of the other stuff in there is fluff as well and not needed.

/Brox
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