86TransAMsbc305

I've posted this before and nobody has helped, When I'm at a dead stop and I floor it, the car boggs down bad, I have a edelbrock performer air-gap intake and a 1406 600cfm edelbrock carb on a lg4 305......anybody have any ideas????

Magman

iTrader: (6)

How does it run otherwise? I'm not a pro but I'd check;
1. Timing?
2. Vacuum leaks
3. Read spark plugs
4. Condition of the carb

Good luck.

formula_novice

iTrader: (1)

If your Edelbrock carb is right out of the box, you may have to change your carb's springs & needle valves. I too had a 1406 Edelbrock carb that would act sluggish when you hit the gas... after changing the springs & needle valves, the problem was fixed.

Hope this helps.

86TransAMsbc305

What springs and needle valves did you use?

formula_novice

iTrader: (1)

My motor was stock and low compression, so it had alot of vaccuum at idle (therefore I needed a stiffer spring). I used the silver springs that came with the Edelbrock spring kit.

I had to hookup a vaccuum guage to my carb and find out how much vaccuum I had. Then you take that number and divide it by two. The resulting number should correspond to a color of spring.
I believe in my case, I had about 14psi / 2 = 7 psi -> silver spring.

As far as the needle valves, I cannot remember which one I used. I can find out, but it won't be until this weekend. You should be able to call Summit and/or email Edelbrock and they can recommend a needle valve for your application.

Good luck!

Bandit5

When it comes to bogging from a stop, the first thing I look to is fuel mixture. First, you have to figure out what kind of bog it is. If you hit the gas and it just feels like th emotor is goign to fall flat on it's face, only barely staying alive, then coming back to life as you ease off the gas or you pick up speed, then it is a rich bog. If the car goes to a higher RPM, drops off while under full throttle, then sparatically picks back up, it is a lean bog.

Now, how is the car when this happens? Is it still cold, or has it warmed up adequately? My guess is that you are running a bit too rich, and you are giving the car too much fuel for it to handle. Adjust the idle air screw and give it more air to compensate, or less fuel, whichever works. Fine tune until the problem goes away.