fed up with knock control
Oct 28, 2008, 05:05 PM
#141
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Join Date: Oct 2007
Location: MIAMI,FLORIDA
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i cant wait to try this patch,Awsome job tephra!!......my car is not even an evo,i drive a 2000 eclipse custom turbo using the evo ecu,im using most of your patches and they worked great!!
Did you have to change the wiring harness at all?
Oct 29, 2008, 03:02 PM
#145
I think its funny how some engines are noisy and others arent, even assembled by the same tech.
Case in point:
Turbojunkie (Billy) had us build a JE 9.5:1 motor for E85 and the car is "quiet". Lucas 10:1 alloy rod motor is "quiet". Okay so at this point you are saying that oh its because its on E85 or I am lying, right?
At the same time we did a build for another customer, a 9:1 JE for dual fuel, BC280s, and it phantom knocks like a *****. The piston wall is set loose on all these motors (.0055-.006), none of them have balance shafts, they all use the same manufacturer for pistons, use the same brand of clutch (2 are exedy twins and one is a triple), and were assembled at the same shop by the same guy.
I honestly think it has nothing to do with the assembly, and more with how finicky the stock ECU is too the "knock frequency". For sake of argument lets assign it a value, 10khz. So is it silicon content, thrust bearings, oil, etc. that make the difference or is it really truly random?
To add to what Charlie said, switching to an AEM on one of these cars after having extensively logged what "noise" looked like in knock voltage, I can personally say if the car knocks now its impossible to distinguish in the logs from what the stock ECU records. I dont think its impossible to tune an AEM and make good power but its knock control is primitive in comparison to Mitsu's.
Case in point:
Turbojunkie (Billy) had us build a JE 9.5:1 motor for E85 and the car is "quiet". Lucas 10:1 alloy rod motor is "quiet". Okay so at this point you are saying that oh its because its on E85 or I am lying, right?
At the same time we did a build for another customer, a 9:1 JE for dual fuel, BC280s, and it phantom knocks like a *****. The piston wall is set loose on all these motors (.0055-.006), none of them have balance shafts, they all use the same manufacturer for pistons, use the same brand of clutch (2 are exedy twins and one is a triple), and were assembled at the same shop by the same guy.
I honestly think it has nothing to do with the assembly, and more with how finicky the stock ECU is too the "knock frequency". For sake of argument lets assign it a value, 10khz. So is it silicon content, thrust bearings, oil, etc. that make the difference or is it really truly random?
To add to what Charlie said, switching to an AEM on one of these cars after having extensively logged what "noise" looked like in knock voltage, I can personally say if the car knocks now its impossible to distinguish in the logs from what the stock ECU records. I dont think its impossible to tune an AEM and make good power but its knock control is primitive in comparison to Mitsu's.
I would still assume (maybe incorrectly) that a "sloppy" build could still cause more issues than a good one. Am I right?
Oct 29, 2008, 04:04 PM
#146
For a layman, I found this a very interesting post. I would have thought the engine build might be accountable for the no knock vs. phantom knock issue. Didn't consider the aggregate effect of parts on harmonics. Thanks for the insight.
I would still assume (maybe incorrectly) that a "sloppy" build could still cause more issues than a good one. Am I right?
I would still assume (maybe incorrectly) that a "sloppy" build could still cause more issues than a good one. Am I right?
Oct 29, 2008, 05:37 PM
#149
For a layman, I found this a very interesting post. I would have thought the engine build might be accountable for the no knock vs. phantom knock issue. Didn't consider the aggregate effect of parts on harmonics. Thanks for the insight.
I would still assume (maybe incorrectly) that a "sloppy" build could still cause more issues than a good one. Am I right?
I would still assume (maybe incorrectly) that a "sloppy" build could still cause more issues than a good one. Am I right?