LS1M scanning

Finally took the time to hook up the LS1M at lunchtime today, first time since doing my meager mods. I tried logging, will have to see how that turned out later on at home. BUT, I also ran it in gauge mode, and watched boost and KR numbers from zero to about 80mph. Boost topped out at 9.41 psi, and KR wasn't looking too bad, until 1-2 shift... then it maxed at 6.15, under WOT. That's a bit on the scary side! During normal driving and acceleration, didn't see any KR at all. DEFINITELY won't be heading to the track again any time soon. Gotta get that FWI built and front PEM installed.

This would explain your recent track times.

What was the temperature out when you scanned? 6 deg KR is concerning. A down pipe would help, PEMs too. I'd wait on the FWI. It cools the air, but also lets more in, so a double edged sword. Maybe instead of spending $ on a tuner, a Mini AFC could help you add some fuel for less. I used one for a while with success.

could be false KR too. if its only occuring at the shift then maybe your tranny is just shifting hard and the sensor is picking up the vib/knock? do you have any scans with the 3.8" pulley on?

Aaron, temps were in the upper 60's, nice cool day here today. I'd def like to see what the DP and front PEM would do to the those KR #'s. The FWI would not be first. Gotta bring that PEM back to work and wire brush so I can spray it. Not familiar with the mini-AFC, but I thought I've read they are not a particularly recommended way to go anymore?

Matthew, my tranny shifts about as soft as my daughter's pillow... before the 1-2 shift I saw #'s in the upper 2's, then it spiked. With the 3.8 pulley I saw max KR around 1.1 or so. I'm running 92 also. ECT showed around 190deg, so it's not really running hot either.

Rather than buying a tuner, which I'd have a real hard time finding free time to learn to use, and then USE, would be great to find someone up here that does this for a living.

I think even the W-body guys around here drive 4 hrs south to SF, SD to get a tune.

I think your KR is real. I almost always see a burst right after the shift into 2nd and 3rd gears. It's very real in my case, as I've been able to tune it out.

i dont have a scanner yet and i think i should b a lil concerned about the double edged sword AA mentioned. my only mods are 180* stat and custom gtd air bx/fwi. im thinkin if i stuff foam in my fenderwell it will block it little of the air flow thus killin the double edged sword. yet still gettin cooler air from outside the engine compartment. ANY THOUGHTS???

Did you do your run with the traction control off? If I leave mine off I get KR at the same spot.

after reading what i just wrote- it sounds kinda stupid and childish... but im still curious

You guys who are fighting KR problems - have any of you loaded the '05 GTP timing table? I think that's the root cause of a lot of part throttle KR. Compare that table to stock and it should be obvious where the light throttle very high timing sits... and I think that might be part of the problem.

c-taylor-6 wrote:

i dont have a scanner yet and i think i should b a lil concerned about the double edged sword AA mentioned. my only mods are 180* stat and custom gtd air bx/fwi. im thinkin if i stuff foam in my fenderwell it will block it little of the air flow thus killin the double edged sword. yet still gettin cooler air from outside the engine compartment. ANY THOUGHTS???

You will be fine with your gutted air box/fwi. Don't bother with the foam or anything. You won't get a bunch of knock from an intake unless you do something very wrong. Can it make a bad situation worse? Possibly. On a stock engine you should be fine. You need to get a scanner if you plan on modding any further so that you can be certain what your kr is.

gotcha, 98riv. thx. after catchin up on regular maintenace, scanner is 1st on the list. i dont like not knowing what she's doin. feels like i have another kid and havent takin her to the doctor for a check up yet(yeah im a lil weird)