Problems with Detonation after Plugs

[8upZR1]

You should try running the Haibec chip with a colder set of plugs. 1 heat range may make all the difference. If the problem is tip in fuel, you could take a look at the fuel pressure when it happens, it may not be increasing as it should. These 2 things were problems for me when I first got my ZR1. Goodluck, nothing is more annoying than a problem at WOT.

[Lowflight]

The problem only happend at low speed and medium speed....

When I hammer down...it seems to be fine...of course it is so loud, I could not hear the knock

[8upZR1]

Ahhhhh, then the solution is simple, just stay at WOT throughout your entire driving experience. Goodluck with the fix.

[Lowflight]

Originally Posted by 8upZR1

Ahhhhh, then the solution is simple, just stay at WOT throughout your entire driving experience. Goodluck with the fix.

That is pretty much what Marc said.....drive it like I stole it...because the previous owner didn't

[ralph92ZR1]

I just put in a Haibeck chip 1 week ago and its great; can feel the difference. Still using stock plugs and at 17500 miles.
For what its worth.

[QB93Z]

LowFlight, Did you ever get a scan done on your engine to get a positive verification that you are getting knock? I have scanned mine and my I get a lot of knock spark retard events. I am trying to isolate the problem to something that I can fix or tune out.
Thanks, Jim

[flyin ryan]

Originally Posted by Lowflight

Do you think I need to regap my plugs to .35 instead of .50?

i would. the larger the gap the more it taxes the rest of the ignition system. everything is going toward smaller gaps these days. that said if you have detonation at .050" it'll probably still be there at .035". the last NHRA SS/AS legal super stocker i built made a little over 2.3 HP/Cube with one 4150 carb naturally asperated & i set the gap at .035"ish. didn't want any more.

[flyin ryan]

Originally Posted by ralph92ZR1

I just put in a Haibeck chip 1 week ago and its great; can feel the difference. Still using stock plugs and at 17500 miles.
For what its worth.

for what it's worth do yourself a favor & install new plugs.