General Category > Quadrajet Carb Talk and Tips

Is there a difference performance wise?

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55 Tony:
Re: 17084226

Thanks, good to know I got a good model.  My old one was only a 750 and the 800 with the larger primaries seem to suit my engine quite well!

I already have a .145" needle and seat, a 110 gallon/hour fuel pump, 3/8" fuel line.  When I mentioned the fuel starvation "always", I meant in the previous q-jet and this one I just rebuilt last week.

Yesterday I did some re-routing of the fuel lines and regulator and it didn't have a problem going WOT through first and second and into third, but it wasn't real hot out either.  Without a doubt better, not sure if it's fixed.

It's not great yet at idle, I still have to read your book better to enlarge the idle circuits.

55 Tony:
Oh, by the HP pump I guess you meant the accelerator pump.  That does have an HP pump in it also.  Never a problem there even in the old q-jet after grinding the shaft just a little shorter.  And with both, when the fuel starvation acts up, if I pump the throttle I get short bursts of power, so the accelerator pump is working fine.  With this one I tried just for the heck of it to move the linkage to the outer hole and it had a little hesitation but not much.  No hesitation at all with the linkage in the proper hole.  I can go from a stop at idle and floor it and it doesn't skip a beat.  Actually left the  vacuum canister slow at about 2 seconds and it seems to help me from spinning the tires till it hits 5500rpm and shifting.  Old one I had close to 1 second and still had no hesitation but it just spun the tires.  So the slower pull off is sort of like a torque limiter of sorts.  A good thing for me to have without slicks on a track.

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