MTC_75vette

I am running a trex cam with a victor jr and mighty demon 750 carb. I forget what size squirters are in the carb but when hooked up to a wideband my tuner said it was right where it should be. When I am at a dead stop and smash the gas the car bogs/stumbles until I get to about 5000 rpm and then pulls like a beast. If I am rolling and smash it the car pulls like a beast. I noticed today if I give it 50% throttle then to the floor it pulls harder then when I just floor it. Can someone give me some advice on when I am having this problem. I am running 2 second 60 foot times and I was told it should be much less. I was also told by a few guys that I may need to replace my 30cc pump with a 50cc in front of my carb. Before I do this I thought id ask for some advice. Thanks for your help.

Ravenous T\A

iTrader: (12)

There some threads on this, most easy fix is the 50cc that I have noticed(plan to do this myself) Timing could be one part of the issue and jetting (not a carb expert but some guys talk about changing squirters and jets)

https://ls1tech.com/forums/carburete...b-stumble.html

https://ls1tech.com/forums/carburete...tor-pumps.html

ZONES89RS

iTrader: (25)

If you have stumble with a 30 cc unit, the 50 cc will fix it.

Rick364ls

iTrader: (1)

Is this a auto or stick?

Doug G

converter size
Rear gears

I have a bone stock Mighty Demon 750 and none of the issues. I tuned it to my motor,plugs look fine,no stumble,and runs fine.

1.6X's 60' off idle launch.

I do have to clean my air bleeds from time to time. (carb clean spray'd thru the straw works fine)

MTC_75vette

I have a 4000 stall but its only flashing to about 3400 I need to have it re-stalled. Its a th-400 trans with 3.70 gears.

ZONES89RS

iTrader: (25)

That shouldnt bog.

MTC_75vette

Zoner what size squirters and jets are you running?

Pop N Wood

iTrader: (1)

You didn't say whether you were mechanical or vacuum secondary.

If it is mechanical, then almost sounds like the secondary shot isn't what it needs to be,

Make sure your secondary pump is touching the cam such that the slightest secondary movement causes a nice strong shot.

this doesn't sound like a 50 cc front shot issue since it seems to only happen past 50% throttle.

First job is always to get the jets and idle circuits right first and do the accel pumps last. When you roll into full throttle nice and slow, what does your wideband say?

ZONES89RS

iTrader: (25)

I have a 50cc front and 31 squirters.