Re: Sensitivity of GM Knock Sensors

["nacelp" <nacelp@bright.net>]

Hey Mark:
Drop said vehicle off at CSH, HQ, with a gas credit card, and we'll get back
to you when its done.....
Grumpy


> Jim, I have 11point 1 to One with alum heads, L98 and I am only running 25
> deg at WOT, with not PE spark adder.  (Make sure that sucker is zeroed
out)
> and I am finally getting no detonation, you may want to go even less
timing
> wise.  I would just keep going until there is no detonation (For research
> purposes)  You may also need water injection or an intercooler too.  OR
you
> may want to add some additional fuel to quench it a bit.  I have slight
> detonation on shifts.  I don't know of any way to eliminate this. I tune
by
> loading the engine in 4th gear at about 600 rpm's and going to WOT and
using
> the brake to hold the engine at 500 rpm increments, pretty much all the
way
> to redline, while recording with diacom.  I have tuned for virtually no
> detonation.  If it detonates a hair on shifts, oh well.  I read an article
> that said that the ecm pulling out about 3 deg seems to run better.  I
> haven't instrumented anything to see if that's correct or not.  Maybe now
> that I have almost zero detonation I should start checking rwhp and add
some
> timing and check again.  All it takes is a lot more time that I don't
have!
> Mark
> -----Original Message-----
> From: Jim Wilson <Wilson.James4@worldnet.att.net>
> To: gmecm@diy-efi.org <gmecm@diy-efi.org>
> Date: Saturday, April 08, 2000 12:50 PM
> Subject: Sensitivity of GM Knock Sensors
>
>
> >
> >    Mark,
> >
> >   Thanks for the reply. I had already been through the timing (21
degrees
> @
> >WOT)  have tried unleaded race gas with the KS still reacting @ WOT. The
> >further up the RPM goes the less Knock but at the initial hit in 2nd gear
I
> >show a 7 degree KR. In high gear I get a 3-2-1 KR and then it goes away
> >about 4500 RPM. I backed the KS down as far as 80"# and it is better will
> >probably go to 70"# and see what that looks like. I realize that at the
> >shift and the initial hit of the throtle there will be some but of course
> >with the big hits I loose power.
> >     Mabey I forgot to mention this is a supercharged 10# boost  LT1 383.
> >
> >                           Jim
> >
> >
>
>---------------------------------------------------------------------------

> >
>

>