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Old 03-17-2007, 10:38 AM   #1
Scooby Guru
Member#: 2237
Join Date: Aug 2000
Chapter/Region: TXIC
Location: DFW
2000 COBB Tuned GC8
2012 Hyundai Veloster

Default Hopefully you all can help... built engine knock issues with AP

Hi All,

I've been having some major issues trying to get a good tune out of my car and every experienced tuner that I've had work with me on it is scratching their collective heads with regards to why my car is doing.

Early cliffnotes: My car is being told its knocking, its not, well it shouldnt be.

Let me tell you what I'm running:
2000 RS chassis, 2002/2003 WRX ECU, AP V1 protune
USDM EJ257 shortblock with upgraded bearings and mahle pistons (99.5mm bore)
JDM ver8 STi heads, AVCS not hooked up
16gEvo3, TXS TMIC, APS 70mm intake and inlet pipe, Smoothed out intake manifold, TGV delete, gasket matched stock exhaust manifold, APS 3" TBE

Firstly, I know I have forged pistons and that they create more noise than stock, but once warm, you can hardly tell a difference.

I got on a dyno two weeks ago and the following log produced the following results. http://www.bankheist.net/logs/log1.xls
The car kept showing a ton of knock correction around 4100 rpm and the tuner had to keep backing out of it, he just didnt like what was going on and suggested that I replace the knock sensor. He then loaded a very conservative tune so I could run the car around, try out different things and not hurt the car. (explains why timing is so much different in the following logs).

So I replaced the knock sensor and still on 93 pump gas, I achieve these results... a little better if you ask me, but still not good. http://www.bankheist.net/logs/log2.xls

So I decided, what the hell, lets through some race gas in. MS109 (105 octane) and achieved the following results:

So, after all this, I'm running a super rich tune, wideband is telling me 10.0 at WOT, with 105 octane gas, and my car still thinks it is knocking.

I know a very simple solution, ditch the Accessport and get a UTEC (it can "ignore" knock signal)... but that's a path I'm not yet ready to go down as I like the fact that AP works in so much unison with the stock ecu's programming.

Any help anyone can offer will be much appreciated!

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Bankheist is offline   Reply With Quote
Old 03-19-2007, 11:48 AM   #2
Scooby Guru
Member#: 23676
Join Date: Aug 2002
Chapter/Region: NESIC
Location: de_dust and Orgrimar


Dont totally ditch the reflash. Sell the AP, pick up a UTEC and a tactrix cable.
The big downside is your custom tune is gone, however your custom tune is close to worthless in your cars current state. The knock is almost certainly just a resonance in the motor from the forged pistons, and your car has the loudest forged internal setup I have ever heard. The unfortunate reality is that at this time the only 2 options for changing how your knock sensor listens would be a Hydra or a UTEC.

Hit up www.wrxhackers.com sign up and explain your problem to those guys. Beware of Hippy, he only half knows what he is talking about (which is 300% more than most of what nasioc members can say) and is a bit of an asswipe.
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Old 03-19-2007, 12:54 PM   #3
Scooby Guru
Member#: 50667
Join Date: Dec 2003
Chapter/Region: TXIC
Location: Dallas/Plano, TX
2000 Impreza Coupe
Enginuity Tuned


so i signed up... in the reasons for accepting me I put:

"Because Davenow said I should join and I have a STi GC8. -Kevin"
KevinHeist is offline   Reply With Quote
Old 03-20-2007, 09:35 PM   #4
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Member#: 143976
Join Date: Mar 2007
Default how much

fa kewl 20000
Ryobob is offline   Reply With Quote
Old 03-26-2007, 02:21 PM   #5
Scooby Guru
Member#: 50667
Join Date: Dec 2003
Chapter/Region: TXIC
Location: Dallas/Plano, TX
2000 Impreza Coupe
Enginuity Tuned



and what are you referring to Ryobob?
KevinHeist is offline   Reply With Quote

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