knock retard and questions.
Thread Starter
Teching In
Joined: Apr 2004
Posts: 45
Likes: 0
From: Pearland, TX
knock retard and questions. I plan on running N2O (100shot wet) but before I do I borrowed my friends EFI Live to check out my engine. I was surprised to see so much knock retard. I did a 3rd gear pull (mn6) from 2k to 6k on the freeway. Starting at 4300 rpm I started getting knock. Imagine straight lines connecting these points.
Rpm 4312—6088
Adv 19.5 29.0
Knock 4.75 1.67
Maf 7976 8773
Maf 152 200
Map 98.0 98.0
Ltft b1 17.2
Ltft b2 15.6
Iat 80*F
Car currently has NGK tr6, gapped to 0.036, K&N dual intake, and a catback. The car has NEVER been tuned but with these basic mods pulled 329 hp at 5900 and 339 ft/lbs at 4500, AFR on WB02 is unknown.
To me this seems like allot of knock retard and allot of timing, especially if I plan to run nitrous. I don’t have tuning software yet… maybe I should….
What do you guys think?
TIA
Will
Rpm 4312—6088
Adv 19.5 29.0
Knock 4.75 1.67
Maf 7976 8773
Maf 152 200
Map 98.0 98.0
Ltft b1 17.2
Ltft b2 15.6
Iat 80*F
Car currently has NGK tr6, gapped to 0.036, K&N dual intake, and a catback. The car has NEVER been tuned but with these basic mods pulled 329 hp at 5900 and 339 ft/lbs at 4500, AFR on WB02 is unknown.
To me this seems like allot of knock retard and allot of timing, especially if I plan to run nitrous. I don’t have tuning software yet… maybe I should….
What do you guys think?
TIA
Will
TECH Addict
Joined: Feb 2004
Posts: 2,826
Likes: 0
Originally Posted by aggie_corvette
I plan on running N2O (100shot wet) but before I do I borrowed my friends EFI Live to check out my engine. I was surprised to see so much knock retard. I did a 3rd gear pull (mn6) from 2k to 6k on the freeway. Starting at 4300 rpm I started getting knock. Imagine straight lines connecting these points.
Rpm 4312—6088
Adv 19.5 29.0
Knock 4.75 1.67
Maf 7976 8773
Maf 152 200
Map 98.0 98.0
Ltft b1 17.2
Ltft b2 15.6
Iat 80*F
Car currently has NGK tr6, gapped to 0.036, K&N dual intake, and a catback. The car has NEVER been tuned but with these basic mods pulled 329 hp at 5900 and 339 ft/lbs at 4500, AFR on WB02 is unknown.
To me this seems like allot of knock retard and allot of timing, especially if I plan to run nitrous. I don’t have tuning software yet… maybe I should….
What do you guys think?
TIA
Will
Rpm 4312—6088
Adv 19.5 29.0
Knock 4.75 1.67
Maf 7976 8773
Maf 152 200
Map 98.0 98.0
Ltft b1 17.2
Ltft b2 15.6
Iat 80*F
Car currently has NGK tr6, gapped to 0.036, K&N dual intake, and a catback. The car has NEVER been tuned but with these basic mods pulled 329 hp at 5900 and 339 ft/lbs at 4500, AFR on WB02 is unknown.
To me this seems like allot of knock retard and allot of timing, especially if I plan to run nitrous. I don’t have tuning software yet… maybe I should….
What do you guys think?
TIA
Will
12 Second Club
Joined: Oct 2003
Posts: 117
Likes: 0
Another thing is your ltrims are very positive. That means that your car is adding that many "points" of fuel to correct for a lean condition. I had a lot of knock also and once I tuned my ltrims to ~0 or slightly negative the knock disappeared. Just a thought but I would definetely try to get your trims down before you spray that may solve your knock problem. This is just a thought and it could just as easily be a bad batch of gas or false knock.
Hope this helps.
Matt
Hope this helps.
Matt
Thread Starter
Teching In
Joined: Apr 2004
Posts: 45
Likes: 0
From: Pearland, TX
Well the car is a '99, so i believe the maf is supposed to have a screen, but mine doesn't (bought it used). I do know that it is not ported.
the filter was recently cleaned but the oil might have fouled the maf?? how do i clean that?
great advice so far.
the filter was recently cleaned but the oil might have fouled the maf?? how do i clean that?
great advice so far.
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TECH Addict
Joined: Feb 2004
Posts: 2,826
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Yeah, rubbing alcohol works great. Use a Q-tip and gently brush it against the resistor. Don't rub, or press down at all. One of the little resistors is probably going to be black. I have noticed that one always turns black, but it will clean up.
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