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Old 01-11-2012, 09:47 PM   #1
DreksSTI
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Default My Datalogs Seem much better, What do you think?

So some of you may have seen my thread about my car having feedback knock at WOT, Here is the link if not, http://forums.nasioc.com/forums/show....php?t=2281535. Long story short, it turned out to be a bad MAF. But it only runs good on the Cobb stage 2 map, If I run the Perrin map and go under heavy load in 3rd or 4th I still see some random feedback knock usually around 1.4-2.8 with an occasional 4.2, and my wideband is reading 10.9-11.0 but with the Cobb map I dont see any feedback knock or Fine knock learn and my AFRs are 11.5-11.8. It makes me believe that something is wrong with Perrins map, Perrin still seems to think there map is perfect and its my car that is the issue. I am getting tuned by Yimi sport tuning on Friday so I am hoping to have some great results, Hopefully much better than Perrins.

Car details:

2007 STI, CNT Catted DP, catback, and Perrin CAI, everything else is stock.

Datalogs with Perrins map
https://docs.google.com/spreadsheet/...VE&output=html
https://docs.google.com/spreadsheet/...Hc&output=html

Datalog with Cobbs map
https://docs.google.com/spreadsheet/...UE&output=html
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Old 01-12-2012, 08:58 AM   #2
DreksSTI
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anyone?
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Old 01-12-2012, 11:58 AM   #3
maxplanck
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Look at the timing on the Perrin map where you get knocking... and compare to similar levels of air flow and rpm on the Cobb map. The Cobb map has significantly less timing (10 degrees where Perrin is trying and failing to deliver about 14) and it keeps your car from knocking.
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Old 01-12-2012, 01:25 PM   #4
DreksSTI
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Yeah I was comparing the timing on the two and noticed that Perrin was adding alot more timing
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Old 01-12-2012, 04:36 PM   #5
flycaster
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Let's see what Yimi thinks once they have a chance to tune it properly. Just my $0.02, but I've never seen knock on a Cobb NWG shelf map unless there was a mechanical issue.

With respect to the 2 WOT maps, at 5K they are both targeting ~14.5 degrees advance, but the Perrin fails and the ECU pulls timing down to ~ 11.5. What jumps out at me is the ~ 1.5 psi diffference in boost. It'll be interesting to see what Yimi comes up with for your final boost target.
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Old 01-12-2012, 07:22 PM   #6
DreksSTI
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Thank you for your thoughts. I have a strong feeling its Perrins map, Because when I was having my lean issues before I changed my MAF I would get knock on either map. But after MAF has been changed the car seems to run awesome with cobbs map. We will see how it goes tomorrow. Wish me luck.

Last edited by DreksSTI; 01-12-2012 at 07:55 PM.
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Old 01-12-2012, 07:57 PM   #7
flycaster
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Show them the logs - see what they say once they get done. And post up a log of the new tune too. Good luck.
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Old 01-12-2012, 09:35 PM   #8
DreksSTI
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Will do, thanks again. Thanks for the luck I will need it, Its friday the 13th haha
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Old 01-15-2012, 08:26 PM   #9
DreksSTI
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Hello everyone! I got tuned by Paul@yimi on Friday. Car runs awesome, Dyno'd 291hp and 325tq. Paul was having some difficulties at first, He said my car was being a pain in the ass lol. But he finally got it dialed in and to his likings. He had to do things a little differently then he normally does and tune my car a little more rich, But it didnt effect the power to much. Target boost is right about 19psi, AFRs are about 10.8-11.3 at WOT..


Here is a datalog, 3rd gear pull.

https://docs.google.com/spreadsheet/...Wc&output=html
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Old 01-16-2012, 11:05 AM   #10
flycaster
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Looks great. For whatever reason, your car just doesn't like a lot of timing at peak loads - no big deal. Based on what I've been told, running higher boost and less timing makes for a safer long term tune than vice-versa anyway. Also, a little on the rich side never hurt anything - it'll give you some added safety margin when that I/C gets heatsoaked in the summer months

Do you notice any difference in how the car feels now?
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Old 01-16-2012, 11:38 AM   #11
DreksSTI
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Quote:
Originally Posted by flycaster View Post
Looks great. For whatever reason, your car just doesn't like a lot of timing at peak loads - no big deal. Based on what I've been told, running higher boost and less timing makes for a safer long term tune than vice-versa anyway. Also, a little on the rich side never hurt anything - it'll give you some added safety margin when that I/C gets heatsoaked in the summer months

Do you notice any difference in how the car feels now?
Your Correct, Paul said the same thing, For whatever reason it just did not like timing at peak load. And I have to agree, Being on the rich side doesnt bother me at all as long as I got good power.

The car runs awesome, Turbo spools much quicker and everything is much smoother. The car just pulls in every gear, Nice and smooth. Thanks for all your help. I appreciate it, Your one of the only guys who kept helping me even if I was being a pain in the ass at times lol.
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