LS timing advance goes to 0 at WOT
09-23-2010, 07:36 AM
#1
Teching In
Thread Starter
Join Date: Jun 2003
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
LS timing advance goes to 0 at WOT Well, I got a weird one for you guys. I am helping a buddy tune his LS motor. It is an LS3 block but we are using the early LS1 style PCM with a 1X cam position sensor and 24X crank trigger wheel. We are using Tuner Cat OBD II software for tuning and HP Tuners to data log. The car uses the original LS1 knock sensors.
The car starts and runs like a champ everywhere but WOT. As soon as you get to WOT the advance drops right to zero. This does NOT appear to be due to knock retard. We have turned off knock retard everywhere we can find it and HP Tuners does NOT report knock retard. It does show the timing going to zero and that's exactly how the car acts, like it has no timing. Goes flat as hell and stops pulling (we are testing on a chassis dyno with load applied to the rollers).
Any ideas?
Richard
The car starts and runs like a champ everywhere but WOT. As soon as you get to WOT the advance drops right to zero. This does NOT appear to be due to knock retard. We have turned off knock retard everywhere we can find it and HP Tuners does NOT report knock retard. It does show the timing going to zero and that's exactly how the car acts, like it has no timing. Goes flat as hell and stops pulling (we are testing on a chassis dyno with load applied to the rollers).
Any ideas?
Richard
09-23-2010, 08:22 AM
#2
TECH Regular
iTrader: (12)
Join Date: Mar 2003
Location: Hershey, PA
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
what are the IAT's? never seen Tuner Cat, but IAT's have a role in timing, as does Max Torque timing.
There are a few tables in the spark table that add or subtract timing.
There are a few tables in the spark table that add or subtract timing.
09-23-2010, 05:00 PM
#3
Teching In
Thread Starter
Join Date: Jun 2003
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
