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Old 08-20-2010, 11:12 PM   #1
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SCT tuner and knock and pinging

2001 GT 5speed.
I loaded up the race tune which is for 93 octane fuel. I noticed some pinging or knock when coming from coasting and hitting the gas. If I just hold it to the floor I don't hear it. It will do it at all rpm ranges. Just on throttle tip in though.

There is a selection on the tuner for "Global timing". The current setting is at 0 degrees. You can go to -1,-2, -3 and so on but no positive numbers. I think I want to pull out a degree or two but not experienced with ignition timing adjustmensts.

Does this sound like what I want to do?
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Old 08-21-2010, 11:12 AM   #2
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Re: SCT tuner and knock and pinging

Anyone.....Help me out.
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Old 08-21-2010, 01:40 PM   #3
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Re: SCT tuner and knock and pinging

That is what it sounds like to me...pull a degree or two of timing because the octane isn't meeting up to what the computer wants.

Is this a canned tune or something that was made for your car?
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Old 08-22-2010, 02:15 AM   #4
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Re: SCT tuner and knock and pinging

Yeah it is a remote tune. I bought a tuner from american muscle and they made the tunes for me. I thought they would be conservative but I guess not
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Old 08-22-2010, 08:14 AM   #5
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Re: SCT tuner and knock and pinging

Before you go messing with it...send them a message or phone call and see if they will fix it for you.
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Old 08-22-2010, 11:18 AM   #6
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Re: SCT tuner and knock and pinging

Quote:
Originally Posted by lowflyn View Post
Before you go messing with it...send them a message or phone call and see if they will fix it for you.
This exactly..

I had the SAME issue with the off the shelf 91 octane SCT tune and the 91 octane here in CA (wayyy oxygenated fuel causing the issue is my guess)

So I mostly run around in 87 setting, but when I go to the track, switch to 91 and drop in one bottle of lucas octane booster, spark knock on tip in goes away.. (Also it pinged in third gear between 4 and 5k rpms at the track..) I am hoping my near-future custom dyno tune will fix that
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Old 09-12-2010, 01:04 PM   #7
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Re: SCT tuner and knock and pinging

Same problem here with an 03 GT and the AM/Bama SCT3 tuner. Both the performance and Race 91 octane tunes ping on my car which is an auto. Here are the symptoms:
1st gear is fine
2nd is fine
3rd is fine
4th is fine, unless I am just cruising around at say 35-45mph and 1500 or so on the tach. If I just press the gas a little to accelerate, it will ping like crazy however if I press down hard it will downshift and NOT ping.
It will also never ping when accelerating hard.

I have tried different brands of fuel and even went up to 94 Sunoco or 93 Exxon/Mobil with no change.

The 87 tune works fine for me as well.

I'm going to email AM/Bama and see but in the mean time, I looked at the adjustments to the tune and see some timing related stuff . Things like 1500rpm/2000/rpm etc and -1, -2 ,-3 etc.
I'm assuming this is DECREASING the timing?

Also, how can I tell what the default settings are with these tunes?

TIA for any help!
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Old 09-12-2010, 02:33 PM   #8
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Re: SCT tuner and knock and pinging

Got my 93 race tune from Bama before he hooked up with AM and it has been excellent with no problems. Im sure Doug is alot easier to get ahold of now.
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Old 09-12-2010, 02:47 PM   #9
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Re: SCT tuner and knock and pinging

Yea.. My race tune and performance tune are 91 octane. I'm gonna email Bama and see what they say. I suspect it's just a simple thing.
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Old 09-12-2010, 09:35 PM   #10
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Re: SCT tuner and knock and pinging

I ended up going -2 degrees on the 0-2000 rpm range for all 3 of my tunes(87s , 87p, and 93 race tune). It seemed to only be on throttle tip in. I asked AM if they have had complaints about this and they said no not at all. But now after seeing the posts on this thread I can see that it's not an isolated issue. Just glad I got it tuned out. I guess it's not that bad, they were just on the aggressive side which surprises me.

The also had the rev limits set at 6500 rpm for all 3 tunes. Seems high becuase after 5500 it just seems to linger so I usually shift at 5600-5800
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Old 09-13-2010, 08:17 AM   #11
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Re: SCT tuner and knock and pinging

I had detonation and it ended up being the gas. Run out the tank you have and fill up somewhere else thats a good station and put some lucas octane booster in it. See if it gets better or goes away. If so you had bad gas.. or you have to much timing.
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