stalls on hard stops or turns

Discussion in 'Holley' started by pro tour gsx, Sep 3, 2011.

  1. pro tour gsx

    pro tour gsx pro tour gsx

    hello I have a new prosystem 950 carb its just like a holley ,car runs fine but if I stop hard or turn fast it wants to die I have checked the float level any help
     
  2. Topless64-455

    Topless64-455 Well-Known Member

    Yardley had an issue like that will a carb from them. I have one and I dont have that issue.
     
  3. DaWildcat

    DaWildcat Platinum Level Contributor

    Maybe try lowering the rear float level slightly?

    Devon
     
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    My AED carburetor did that. When I contacted AED, their response was, yes, the bigger carburetors will do that. They could fix it, but it would reduce performance. The HP Holleys have that fix. I have an E-mail from AED about that. I'll have to dig it up.
     
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I E-mailed AED about this back in March of this year. Here is his reply. Not sure if it applies to your carburetor Mike, but it might.

    Hi Larry:

    You are absolutely right about this problem. Here’s what’s going on. When you get on the brakes g-forcs is actually pushing fuel through the rear main jets up the main well in the metering blocks then through the boosters. Since the throttle is closed it’s actually flooding the carburetor a bit, or richening up the mixture at idle under the braking conditions. It’s much more of a problem with larger carburetors because of the bigger jet area letting more fuel through. Holley actually makes a metering block they used on 850’s years ago (maybe they still do) that has a 90 degreee cross well that makes it harder to pull fuel through. It works ok, but it kills performance, by a tenth or more, since it’s harder to pull fuel. Another option is using a rear power valve Larry so you can reduce the rear main jets. This will help but if you see a fair amount of g-force on launch you can have a lean spot as the power valve becomes uncovered by fuel. So a bit of a catch 22. Since most of our 850’s & 1000’s are used for pro-street/ bracket applications we take the safe route. If you don’t use slicks on your car, & have a good fuel pump, & you want to make this better you can install a rear power valve & jet down the secondaries about 8 jet sizes. This will help. Also a little higher idle speed & a little lower rear float setting. Hope this helps Larry. Let me know if you have any questions. Your new engine sounds pretty impressive!!!



    Take Care



    John Dickey

    AED Performance

    2530 Willis Rd.

    Richmond, VA 23237

    804-271-9107 Ext:11

    jd@aedperformance.com

    www.aedperformance.com
     
  6. pro tour gsx

    pro tour gsx pro tour gsx


    I did and it worked thanks stupid ? but what is the difference in the front and rear floats ?
     

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