Lost timing
Thread Starter
TECH Regular
Joined: Mar 2002
Posts: 433
Likes: 0
Lost timing For some reason I'm not getting full timing. It seems MAX KR vs. RPM value ( 4 ) is always substracted from timing curve values even though ATAP says KR is zero. It's not on low octane map, the timing values would be even lower.
Car is a -98 Z28. MAF table and base spark tables are stock. I've tuned ltrims using infector flow rate.
What should I look into ?
Car is a -98 Z28. MAF table and base spark tables are stock. I've tuned ltrims using infector flow rate.
What should I look into ?
TECH Addict
Joined: Jul 2002
Posts: 2,261
Likes: 0
Re: Lost timing
For some reason I'm not getting full timing. It seems MAX KR vs. RPM value ( 4 ) is always substracted from timing curve values even though ATAP says KR is zero. It's not on low octane map, the timing values would be even lower.
Car is a -98 Z28. MAF table and base spark tables are stock. I've tuned ltrims using infector flow rate.
What should I look into ?
Car is a -98 Z28. MAF table and base spark tables are stock. I've tuned ltrims using infector flow rate.
What should I look into ?
joel
Re: Lost timing i was tinkering around in ls1edit and noticed that one of the torque manegement tables was not zeroed ( the one with the smooth increasing curve - exponential), so i flattened it out so it reads all zeros, and what do you know! i'm getting my timing where i want it!
i also returned the kr tables back to stock , except for the max kr vs. rpm ( i think that's what its called) where i made the max kr 4 deg. across the board.
i also returned the kr tables back to stock , except for the max kr vs. rpm ( i think that's what its called) where i made the max kr 4 deg. across the board.
TECH Addict
Joined: Jul 2002
Posts: 2,261
Likes: 0
Re: Lost timing
i was tinkering around in ls1edit and noticed that one of the torque manegement tables was not zeroed ( the one with the smooth increasing curve - exponential), so i flattened it out so it reads all zeros, and what do you know! i'm getting my timing where i want it!
i also returned the kr tables back to stock , except for the max kr vs. rpm ( i think that's what its called) where i made the max kr 4 deg. across the board.
i also returned the kr tables back to stock , except for the max kr vs. rpm ( i think that's what its called) where i made the max kr 4 deg. across the board.
Re: Lost timing no , i have an m6.
why did you assume i had an A4? do they have different torque management characteristics??
is the procedure done differently in an A4?
why did you assume i had an A4? do they have different torque management characteristics??
is the procedure done differently in an A4?
TECH Addict
Joined: Jul 2002
Posts: 2,261
Likes: 0
Re: Lost timing From what I've read here,and on other sites, there is minimal interaction between TQ MNGMT and the rest of the PCM with an M6 (M12). With an A4 it's suggested that all tables in TQ Management be "Zeroed Out". Whereas with standard transmissions I,ve read that we need only change Max Tq setting to 639 and set Abuse Mode Test to an unrealistic RPM. This definitely doesn't jibe with your experience.
Was TQ Mngmt pulling timing at high loads and high RPM?
MAYBE ONE OF THE gurus will chime in?????
joel
Was TQ Mngmt pulling timing at high loads and high RPM?
MAYBE ONE OF THE gurus will chime in?????
joel
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'
Brett Foote
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Thread Starter
TECH Regular
Joined: Mar 2002
Posts: 433
Likes: 0
Re: Lost timing The car is A4. Sorry, I haven't looked into this issue for a month or so and forgot this thread. Piston slap is getting worse and I'm pulling the engine within couple of weeks.
I was not logging the IAT or engine temp, I've zeroed ignition IAT-MAP table. The engine was operating at normal temps according to the gauge.
Max torque is set 500 and I've zeroed upshift torque reduction from 275 and up. Abuse mode torque reduction is zeroed. Abuse mode test is rpm > 7000, speed < 0. TCS retard tables are stock. Torque loss from retard is stock as I wanted to keep some of it for mid throttle shifts and get control through the upshift table.
Thanks for the suggestions. I'll have to come back to this during next spring. Driving season here in Finland is soon over.
I was not logging the IAT or engine temp, I've zeroed ignition IAT-MAP table. The engine was operating at normal temps according to the gauge.
Max torque is set 500 and I've zeroed upshift torque reduction from 275 and up. Abuse mode torque reduction is zeroed. Abuse mode test is rpm > 7000, speed < 0. TCS retard tables are stock. Torque loss from retard is stock as I wanted to keep some of it for mid throttle shifts and get control through the upshift table.
Thanks for the suggestions. I'll have to come back to this during next spring. Driving season here in Finland is soon over.
Re: Lost timing well it's official , i have my timing back .
i floored it a few times tonight and all of them were with in my timing table except if i had knock.
i'll keep fooling around with this for next few days since the driving season in AZ never stops (gets better in winter), i'll keep you guys posted.
i floored it a few times tonight and all of them were with in my timing table except if i had knock.
i'll keep fooling around with this for next few days since the driving season in AZ never stops (gets better in winter), i'll keep you guys posted.