89 mustang
DSS 306 9.5 compression
4:10 gears
t-5 transmission
Victor jr. intake
Non-smog legal AFR 185's. Not ported but 100% polished.
Z-303 camshaft
1 5/8 long tubes, full mac exhaust.
Holley blue/regulator
10 Lbs vacuum at idle.
I have a 6 / 5 power valves in.
I had a similar setup 5 years ago and it flew with my holley 4150 750 DP.
Im using the same carb and its being a bEaCh!
It being a pain to get setup due to the big aftermarket parts on such a small engine with little vacuum.
Im needing advice on what to do.
I having a hell of a time getting my fuel ratio above 11.8 at idle and it even drops when i ease into it. I did drill a 1/16th hole in the primary butterflies and it seemed to help alittle.
It had a bad stumble at idle. The Innovate fuel/air meter said it was super lean during the stumble so i drilled out the shooter .004 and that fixed the stumble.
When i increase speed from a dead stop the stumble is gone, so i ease into the throttle then punch it. It gets even fatter. 11-10 and even to a high 9 on fuel ratio. I can probably fix the fat condition by changing jet sizes.
What is driving me nuts is the 11.6 at idle. I screw in the four adjusters slowly and equally in and it wont fix the 11.6. Then of course if i keep screwing in the four adjusters it creates a bad idle tries to die.
Took the carb off to turn the secondary idle up just alittle so i could close the primary as much as possible so less air would pass the idle transfer slot.
Today i drilled the idle air bleeds in the primary .002 and that still didn't change the A/F at idle.
Im about to give up and by some speed demon prbably in the 670cfm range.
Im dont want to put a small carb on the car and kill the 5,000+ powerband.
At the track i don't see that car ever getting below 5,500 so i would hate to choke the engine with a small carb.
Any idea welcome
DSS 306 9.5 compression
4:10 gears
t-5 transmission
Victor jr. intake
Non-smog legal AFR 185's. Not ported but 100% polished.
Z-303 camshaft
1 5/8 long tubes, full mac exhaust.
Holley blue/regulator
10 Lbs vacuum at idle.
I have a 6 / 5 power valves in.
I had a similar setup 5 years ago and it flew with my holley 4150 750 DP.
Im using the same carb and its being a bEaCh!
It being a pain to get setup due to the big aftermarket parts on such a small engine with little vacuum.
Im needing advice on what to do.
I having a hell of a time getting my fuel ratio above 11.8 at idle and it even drops when i ease into it. I did drill a 1/16th hole in the primary butterflies and it seemed to help alittle.
It had a bad stumble at idle. The Innovate fuel/air meter said it was super lean during the stumble so i drilled out the shooter .004 and that fixed the stumble.
When i increase speed from a dead stop the stumble is gone, so i ease into the throttle then punch it. It gets even fatter. 11-10 and even to a high 9 on fuel ratio. I can probably fix the fat condition by changing jet sizes.
What is driving me nuts is the 11.6 at idle. I screw in the four adjusters slowly and equally in and it wont fix the 11.6. Then of course if i keep screwing in the four adjusters it creates a bad idle tries to die.
Took the carb off to turn the secondary idle up just alittle so i could close the primary as much as possible so less air would pass the idle transfer slot.
Today i drilled the idle air bleeds in the primary .002 and that still didn't change the A/F at idle.
Im about to give up and by some speed demon prbably in the 670cfm range.
Im dont want to put a small carb on the car and kill the 5,000+ powerband.
At the track i don't see that car ever getting below 5,500 so i would hate to choke the engine with a small carb.
Any idea welcome