Machine gun before full boost?? turbo
Machine gun before full boost?? turbo Im rolling along at about 20 and start to get into it.. the turbo spools up and I get a super fast..."pop pop pop pop pop" for a split second just before it hits full boost and then is fine.
Ive logged it several times and Im running 15psi. how should the fuel mixture taper into full boost mode? Right now I have it at about 110kpa running around 11.9:1 AF. 150kpa and up is set to run around 11.3-11.5:1 in that area. Timing under full boost is 15*. Air intake temp is around 80-90*. Plugs look brand new.
Any explanation for this machine gun effect?
Setup is-- 5.3L 317 heads 8.6:1 comp. 224/224 .580/.580 112 cam,
edelbrock intake.. GT45 turbo.. more details and pics in sig.
Ive logged it several times and Im running 15psi. how should the fuel mixture taper into full boost mode? Right now I have it at about 110kpa running around 11.9:1 AF. 150kpa and up is set to run around 11.3-11.5:1 in that area. Timing under full boost is 15*. Air intake temp is around 80-90*. Plugs look brand new.
Any explanation for this machine gun effect?
Setup is-- 5.3L 317 heads 8.6:1 comp. 224/224 .580/.580 112 cam,
edelbrock intake.. GT45 turbo.. more details and pics in sig.
it pops im guessing out the exhaust like super fast, like a rev limiter, but it only does it as the rpms go up, starting from like 3000rpms. by the time it hits full rpm and boost it runs smooth and fine.
Originally Posted by pwrtrip75
it pops im guessing out the exhaust like super fast, like a rev limiter, but it only does it as the rpms go up, starting from like 3000rpms. by the time it hits full rpm and boost it runs smooth and fine.
no 2 step, It only does it for such a short time, not even a second. Hard to tell by the log, at around 100-110kpa one frame goes lean and then the next frame is rich, does that a couple times only for a few frames and then back to normal.
Anyone know what the A/F should be at these increments? mine is close to this-
100-110kpa 12.0:1 timing 18
110-120 11.8:1 timing 15
120-130 11.6:1 timing 15
130-up fluctuates between 11.4-11.6:1 timing 15
Am I too lean at around 100-110 maybe?? or should the AF go straight to 11.5ish right at 100kpa? Or anything related? My 60# injectors idle like crap also, not sure if somethings up there?
Anyone know what the A/F should be at these increments? mine is close to this-
100-110kpa 12.0:1 timing 18
110-120 11.8:1 timing 15
120-130 11.6:1 timing 15
130-up fluctuates between 11.4-11.6:1 timing 15
Am I too lean at around 100-110 maybe?? or should the AF go straight to 11.5ish right at 100kpa? Or anything related? My 60# injectors idle like crap also, not sure if somethings up there?
You are too rich, you should be in mid to low 13's af till about 5 psi then taper to your richer 11's by 8 or so psi. you will see better spool also. More timing in the low boost regions.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by lbz34
You are too rich, you should be in mid to low 13's af till about 5 psi then taper to your richer 11's by 8 or so psi. you will see better spool also. More timing in the low boost regions.
Thanks, I will try this tonight.
