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Old 11-30-2013, 03:00 AM   #1
BeastianSTI
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Default Help - Why am I knocking ??

Hey all,

I'm running into some issues with my STi while we've been trying to tune it. It wont take timing past a certain point. Compression numbers were within spec, the car has new iridium spark plugs gapped to .029. New o2 sensor ( maybe a year old ). MAF sensor cleaned... Took the injectors out and soaked them in injector cleaner, which seemed to lessen the ticking noise that I normally hear from the injectors... Just trying to throw everything out on the table that I can think of.

Aside from knocking in the log, the car seems like its' lacking power from the get go. I feel like I have to give it 70% throttle from a stop light to get the people off my butt lol. Once I get to a certain point it pulls though. Sometimes it rides out, sometimes it doesn't.

We can't really seem to figure out what is causing the issue. Please help!

1. Please see the log here: https://drive.google.com/file/d/0B0i...it?usp=sharing

2. Map was developed by my tuner.

Mod list:

Aps cold air intake 65mm
Aps turbo inlet pipe 3"
Perrin up pipe
Full tbe exhaust - prosport 3" bell mouth dp
Tgv deletes
Turbo xs top mount
Silicone Y-pipe
Act hdss clutch
Walbro fuel pump( the one just above stock that everyone gets - 255)
Hallman mbc @ 19.5 psi
8mm Phenolic Spacers
After Maf Hose - Silicone

Car:

2005 USDM Sti

93 Octane fuel, Florida - 60-80*F
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Old 11-30-2013, 03:57 AM   #2
Phatron
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you're simply running too much timing and too lean.
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Old 11-30-2013, 02:04 PM   #3
BeastianSTI
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The timing looks like its the same as most other Stage 2 STi's out there. Is it too aggressive for the AFR in general?
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Old 11-30-2013, 02:31 PM   #4
Phatron
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subies need to run rich. I stay in the 10.5-10.8 range on pump gas
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Old 12-01-2013, 12:04 AM   #5
Airboy
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Your Engine Load (g/rev) numbers seem to be half what I would expect to see,may be even less while the MAF(v) is normal. Maybe add MAF(g/s) the next time.
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Old 12-01-2013, 01:15 AM   #6
Phatron
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I was gonna say that too. Seems like the fueling was tuned completely from the maf instead of using the injector scalar
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Old 12-01-2013, 01:17 AM   #7
BeastianSTI
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Yeah, evidently the tune is "half-MAF'd". Not really sure how that ties into the load numbers :S Does it seem like there is a problem with the tune though, that could be causing the knock??

Here's a new link to the log that is preview-able:

https://drive.google.com/file/d/0B0i...it?usp=sharing

Thanks guys!
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Old 12-01-2013, 01:45 AM   #8
Concillian
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Quote:
Originally Posted by BeastianSTI View Post
The timing looks like its the same as most other Stage 2 STi's out there. Is it too aggressive for the AFR in general?
You can't tell the car what timing it wants to run. Let the car tell you what timing it wants to run.

Running more timing than it wants because some other car does it is a good way to end up with a spun bearing or broken ringlands. "Because some other guy does it" is a terrible philosophy in general, but is particularly bad when tuning. A good way to get a starting point, yes. But you can't rationalize with physics like you can with your brain to justify doing something because someone else is doing it.

I don't have a whole lot of experience with your octane fuel, as on CA91, mine are lucky to run 12 degrees at 20 psi when the turbo is just spooling, where you seem to think it's normal to ask for 16. Are the tunes you're comparing yours to logging 20psi? Or 18?.

Running richer will help some, but I'm not sure that's all of it.

And half-MAF shouldn't be necessary on a 32bit ECU, why are you half-MAFed?

Is it a legit TurboXS top mount? Or an Ebay brand "XS power" top mount?
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Old 12-01-2013, 08:54 AM   #9
BeastianSTI
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It is a legit turboxs top mount. Thanks for the good input concillian!

I've been learning a lot about tuning but I'm not ready to tune the car myself yet. Guess I need to get a new tune. Definitely don't want to blow things up...
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Old 12-04-2013, 02:37 AM   #10
BeastianSTI
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Any sort of mechanical issues that I should take a look into, or do you guys think this is purely tune related?

Appreciate the help!
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Old 12-04-2013, 03:02 AM   #11
Phatron
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richen up fuel to 10.8 remove 2.5* of timing...if the knocking stops, then you have the answer
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Old 12-04-2013, 09:56 AM   #12
BeastianSTI
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From which load/rpm ranges should I remove the timing from?
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Old 12-04-2013, 10:04 AM   #13
Phatron
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I'm not trying to be mean, but if you need to ask that you probably shouldn't be doing it yourself.

But everywhere at wot.

You can't run an aggressive tune in a hot humid climate like Florida.
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Old 12-04-2013, 11:37 AM   #14
BeastianSTI
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Agreed. I'm definitely not ready to start creating my own tunes, because i don't fully understand how everything is interconnected yet.
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Old 12-04-2013, 05:24 PM   #15
fastblueufo
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Quote:
Originally Posted by Phatron View Post
richen up fuel to 10.8 remove 2.5* of timing...if the knocking stops, then you have the answer
I agree with Ron. If your still having issues after doing what ron said then it is likely that you may have an issue with compression leakage in one or more cylinders. Bad combustion will also show up as knock in a log. That coupled with a lower than normal tq numbers.
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Old 12-05-2013, 07:24 AM   #16
BeastianSTI
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Compression was good though. I was thinking maybe something along the lines of valve lash or injector faults. We'll see what happens though!
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Old 12-11-2013, 08:25 AM   #17
BeastianSTI
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Cleaned the injectors and things appear to be much better.
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Old 01-03-2014, 08:35 AM   #18
BlazeRex
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Tune doesn't look bad. Probably in the middle of revisions.

Ron- Rarely have I had to run a car that rich. Most run 11.1-11.4 AFR mid powerband.
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Old 01-03-2014, 11:54 AM   #19
Phatron
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It's not about having to. How much power do you pick up from being 0.3-0.6 leaner?

I think the extra buffer in case of a lean leak is more important than a minuscule amount of power.
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Old 01-05-2014, 01:53 PM   #20
sidewayz
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Quote:
Originally Posted by Phatron View Post
It's not about having to. How much power do you pick up from being 0.3-0.6 leaner? I think the extra buffer in case of a lean leak is more important than a minuscule amount of power.
Agreed. All cars I tune with a tmic get 10.8-10.9 afr. Fmic cars see around 11.0-11.2. It's all about safety and not being greedy
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