Argh! Need help! (UTEC and knocking)
07-17-2003, 02:31 PM
#1
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Argh! Need help! (UTEC and knocking)
So I have a full catless turboback, catless uppipe and Samco IC hoses. I've been having serious knocking issues with the new stage2 maps, even when I added .2 to fuel and subtracted 2 from timing across the board. This has happened across different tanks of Chevron 91 octane too. So I reset my ecu yesterday, closed the ABC, and set it to a blank map (ECU across the board on every map). There was STILL knocking, especially in 4th and 5th gear at around 3-4k rpms, sometimes at only 7-10psi! Has this ever happened to anyone? Is my knock sensor going haywire, or is my engine beat, or have I had astronomically bad luck with gas? Any help would be appreciated.
-John
-John
07-21-2003, 05:33 PM
#3
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Originally posted by jrauck
use 93 instead of 91 and then try to make changes.........
use 93 instead of 91 and then try to make changes.........
So he should drive to another state to get gas?You'll probably have better luck lowering boost to a peak of 15ish psi in the midrange. Reducing timing will only do so much.
07-22-2003, 11:43 AM
#4
Chewwwwy
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just pull the timing 4 degrees, and leave the fuel the same...
make sure you have a good map in there... i would recomend using a turbo xs map, with timing pulled back 4 degrees. if that dosent work, make sure all the mods for the map are the same as your mods. if that still dosent work, you might have a bad knock sensor...
make sure you have a good map in there... i would recomend using a turbo xs map, with timing pulled back 4 degrees. if that dosent work, make sure all the mods for the map are the same as your mods. if that still dosent work, you might have a bad knock sensor...
07-22-2003, 03:39 PM
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I've said it before and I'm sure I'll say it again.
Chevron 91 octane in the Bay Area is very inconsistent
I have had several bad tanks of gas. ALL were Chevron. I know two other people who have had bad tanks of Chevron. Someone in the bay area posted here a week or two ago with bad gas from Chevron.
I have had tanks of Chevron that were fine, but I've had too many bad experiences with Chevron 91 to trust them.
I've been buying 76 for about a year and have had no major octane problems since. I mean it's still 91 octane, but at least it's consistent.
Also I agree with the Strng1dah, tuning for lower boost is a good idea. Especially when you first start tuning. You do NOT want to be tuning from knock towards no knock. You want to start with no knock and progressively move towards knock. Then you KNOW what you need to back off to.
I'd advise turning the boost down to ~12-13, then add a pound or two once you get that tuned reasonably until you get where boost is not giving more power. Starting low will give you a better idea of what effects your changes have before you start getting to the edge. You'll also be in a more robust location to be learning the UTEC and tuning in general.
Chevron 91 octane in the Bay Area is very inconsistent
I have had several bad tanks of gas. ALL were Chevron. I know two other people who have had bad tanks of Chevron. Someone in the bay area posted here a week or two ago with bad gas from Chevron.
I have had tanks of Chevron that were fine, but I've had too many bad experiences with Chevron 91 to trust them.
I've been buying 76 for about a year and have had no major octane problems since. I mean it's still 91 octane, but at least it's consistent.
Also I agree with the Strng1dah, tuning for lower boost is a good idea. Especially when you first start tuning. You do NOT want to be tuning from knock towards no knock. You want to start with no knock and progressively move towards knock. Then you KNOW what you need to back off to.
I'd advise turning the boost down to ~12-13, then add a pound or two once you get that tuned reasonably until you get where boost is not giving more power. Starting low will give you a better idea of what effects your changes have before you start getting to the edge. You'll also be in a more robust location to be learning the UTEC and tuning in general.
Last edited by Concillian; 07-22-2003 at 03:44 PM.
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