Knock Problem
Best to have Dr. Gray retune it for you. He has a well established rep in SoCal for sure.
Are you running Unocal Premium gasoline? Don't run the cheaper brands. Also, the quality of the gasoline can vary in California depending on whether you're getting the refineries' summer, or winter fuel blend.
Like others mentioned above, get a boost gauge and a wideband. Once you have the WB installed then get a knowledgeable fellow Evo owner to log AFR's, timing, and knock for you.
Are you running Unocal Premium gasoline? Don't run the cheaper brands. Also, the quality of the gasoline can vary in California depending on whether you're getting the refineries' summer, or winter fuel blend.
Like others mentioned above, get a boost gauge and a wideband. Once you have the WB installed then get a knowledgeable fellow Evo owner to log AFR's, timing, and knock for you.
Last edited by sparky; Mar 4, 2009 at 05:02 PM.
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Make sure you have other possibilities eliminated, such as a faulty pcv valve. It can leak oil into the combustion chamber and cause knock.
What fuel pump do you have? At what fuel pressure?
As others advised you, which is golden advice, get your gauges.
Do you know what gear he was in during your tune on the dyno?
What fuel pump do you have? At what fuel pressure?
As others advised you, which is golden advice, get your gauges.
Do you know what gear he was in during your tune on the dyno?
Thread Starter
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From: Los Angeles,California
i have a walbro fuel pump....idk the fuel pressure....i am gonna get the gauges as soon as i can.....i asked for a retune they said i have a sensitive knock sensor....can that be possible
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wait a second. Your running a bigger turbo, with supporting mods (i hope) and you have absolutly nothing to monitor what you're engine is doing? Im you even got it tuned. Go in the ECUflash forum and LEARN what is happening to you're car. You need to understand the problem and fix it rather then dropping hundreds of dollars on a tune that gave you the knock in the first place.
its an easy fix. Elliminate all mechanical possibilties, go in your ecu pull some timing where needed.
its an easy fix. Elliminate all mechanical possibilties, go in your ecu pull some timing where needed.
thanks cfdfireman1 for the pics, obviously you can see its not rocket science, i also agree with killthelights, you need to understand at least the basics if your gunna run an aftermarket turbo
If it's the CEL flash knock light rom patch, the fix is simple...tune out the knock. If it's one of those TurboXS knock lights, then I'd say that was a very pointless investment.
At a minimum every Evo should have a wideband o2 and a boost gauge, do yourself a favor and buy them. At least with the wideband you can see whether or not it's a lack of fuel causing the knock or just too much timing.
At a minimum every Evo should have a wideband o2 and a boost gauge, do yourself a favor and buy them. At least with the wideband you can see whether or not it's a lack of fuel causing the knock or just too much timing.
How did Dr. Gray, tune your car? Was it a dyno tune, a road tune, or an Email flash? I think that the guy is in the San Fernando Valley, if I am not mistaken. Drive your car over to his place and have him plug his laptop in. He should be able to adjust the tune so that it eliminates the knock in ten minutes.
Thread Starter
Evolving Member
Joined: Nov 2007
Posts: 186
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From: Los Angeles,California
wait a second. Your running a bigger turbo, with supporting mods (i hope) and you have absolutly nothing to monitor what you're engine is doing? Im you even got it tuned. Go in the ECUflash forum and LEARN what is happening to you're car. You need to understand the problem and fix it rather then dropping hundreds of dollars on a tune that gave you the knock in the first place.
its an easy fix. Elliminate all mechanical possibilties, go in your ecu pull some timing where needed.
its an easy fix. Elliminate all mechanical possibilties, go in your ecu pull some timing where needed.
How did Dr. Gray, tune your car? Was it a dyno tune, a road tune, or an Email flash? I think that the guy is in the San Fernando Valley, if I am not mistaken. Drive your car over to his place and have him plug his laptop in. He should be able to adjust the tune so that it eliminates the knock in ten minutes.
Thread Starter
Evolving Member
Joined: Nov 2007
Posts: 186
Likes: 0
From: Los Angeles,California
If it's the CEL flash knock light rom patch, the fix is simple...tune out the knock. If it's one of those TurboXS knock lights, then I'd say that was a very pointless investment.
At a minimum every Evo should have a wideband o2 and a boost gauge, do yourself a favor and buy them. At least with the wideband you can see whether or not it's a lack of fuel causing the knock or just too much timing.
At a minimum every Evo should have a wideband o2 and a boost gauge, do yourself a favor and buy them. At least with the wideband you can see whether or not it's a lack of fuel causing the knock or just too much timing.