Is it a Carb. Problem??

[MillerTime12]

Ive recently bought a 750 proform race carb for my 89 camaro drag car. After properly setting the float level and idle we have taken it to the track. I've experienced problems with the car "stumbling" or "lagging" off the line. While trying to find the problem with the car today, i noticed the adjustable "airflow" screws on the front bowl or plate were 1 1/2 turns out on both sides, where as the back are only 3/4 of a turn out.
Im wondering if this may be my problem with my car not wanting to leave the line properly.
Note: the timing is at 36 degrees

[hammertime]

Put them both to 1 1/4, but thats not whats doing it.

Do you have jet extensions ?

[MillerTime12]

Yes the back bowl came with bowl extentions

[MillerTime12]

Put them both to 1 1/4, but thats not whats doing it.

Do you have jet extensions ?
Yes it has bowl extentions but if thats not it, then wat could it be??
Do u think i may have the bowls set a lil low, causing it to not get the fuel it needs off the line??

[hammertime]

Put them both to 1 1/4, but thats not whats doing it.

Do you have jet extensions ?
Yes it has bowl extentions but if thats not it, then wat could it be??
Do u think i may have the bowls set a lil low, causing it to not get the fuel it needs off the line??

Not bowl extensions, jet extensions would be on the back jets. Have you had the bowls off the carb and looked at the back jets ? If so is there anything else on them or just the jets ?

[chevysteve2]

Ive recently bought a 750 proform race carb for my 89 camaro drag car. After properly setting the float level and idle we have taken it to the track. I've experienced problems with the car "stumbling" or "lagging" off the line. While trying to find the problem with the car today, i noticed the adjustable "airflow" screws on the front bowl or plate were 1 1/2 turns out on both sides, where as the back are only 3/4 of a turn out.
Im wondering if this may be my problem with my car not wanting to leave the line properly.
Note: the timing is at 36 degrees

I would check the accelertor pumps to see if the pump arm is all the way against the adjuster, if you have any slack it will definetly bog. Also I would check the ignition curve, the car might not have enough inital timing.

good luck ,
steve

[MillerTime12]

haha
im sorry
i meant jet extentions
but yes it does

[itsabird]

all good points, i would also look at useing larger shooters.

[TS1955]

Are you foot-braking or using a trans-brake? If you are foot-braking I would look at the accelerator pump circuit. If you are using a trans-brake you might check fuel pressure and or float level.

TS1955

[MillerTime12]

Are you foot-braking or using a trans-brake? If you are foot-braking I would look at the accelerator pump circuit. If you are using a trans-brake you might check fuel pressure and or float level.

TS1955
Im foot-braking it. I adjusted the airflow screws and it didnt help much.

[CamBirdRacing]

Bigger squirters and longer accel pump cam.

[MillerTime12]

Bigger squirters and longer accel pump cam.
You say bigger sqirters, just how much bigger???
Its got 31's on both the front and rear.

[itsabird]

i would start with 35, and go up or down from there.

[curtisreed]

One other thing to think about when you are footbraking a car is how far down into the pump shot you are before you take off. It will lessen the amount of shot you get, sometimes you have to change to a different shape pump cam to get a longer shot or one more toward the end.

Curtis

[oldandtired]

One other thing to think about when you are footbraking a car is how far down into the pump shot you are before you take off. It will lessen the amount of shot you get, sometimes you have to change to a different shape pump cam to get a longer shot or one more toward the end.

Curtis
x2 Use a brown acc pump cam in position #1 or a pink acc cam in position #2. Either will continue to squirt for about 35 degrees of throttle opening.

Dave

[wmeabates]

I have the same carb that had the same problem.I tried most of the things mentioned so far.Also tried 50 cc pumps.If anything it got worse.I took the mettering blocks off,driled the pre set emulsion bleed holes(8 holes each block)to .033 then put idle feed restricker jets in all the holes. .031-.031-.028-.028 top to bottom.60 ft time went from 1.5s to 1.3s.You should see the rubber on my garage floor,when I was done I could pick the wheels up before sliding out the door.Might be something to think about if the other things mentioned don't fix it.Bill.