blow throurgh carb
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blow throurgh carb

  1. #1
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    Default blow throurgh carb

    does any one have experience with blow through set ups I have a 750 4150 holly from CSU on a twin turbo sbc an it ran good on the dyno an now its in the car an it has a good stumble when accelerating I have never tuned this type of carb

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Whats changed since dyno? Hat entry position same?whats the wideband saying when it does it?

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    nothing I can think of just added vacuum line for the trans the regulator reference is off the hat the I used the dyno regulator not mine my idle pressure is 7 1/2psi 30* timing idles good just when you crack the throttle it stumbles cleans up above 3500 I don't have a wide band afr was 10.66 to 11.15 on the dyno

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    Thats alil rich.if its a stumble at the hit of thr throttle tslots need to be at .020 on primaries and if u are using a csu hat id suggest doin vent tube extensions and have them at bout 2 inches into the hat inlet.csu hats arent the best imo wish i had bought a ev pro hat for mine.much taller n nicer hat to tune.honestly youre chasing yoir tail till u gta wideband setup.a.e.m. widebands r nice n cheap.ypuve dropped the dime on a turbo deal spend the 180 for a wideband and optimize it now bud.lotta power given up runnin a turb motor too rich

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    no money spared on this thing I didn't even think about putting a wide band on I will now you know how it is runs bad ass on the dyno makes good power put it in the car set it up an it runs like dog shit an I do have the csu hat with 1/8 fitting it lights off first try an idles good

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    Quote Originally Posted by neil450 View Post
    no money spared on this thing I didn't even think about putting a wide band on I will now you know how it is runs bad ass on the dyno makes good power put it in the car set it up an it runs like dog shit an I do have the csu hat with 1/8 fitting it lights off first try an idles good
    Not saying you won't get your stumble worked out in the LONG run, but if NO MONEY SPARED was the type of build - - why was it not built with EFI??? Just a question.
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    Quote Originally Posted by neil450 View Post
    no money spared on this thing I didn't even think about putting a wide band on I will now you know how it is runs bad ass on the dyno makes good power put it in the car set it up an it runs like dog shit an I do have the csu hat with 1/8 fitting it lights off first try an idles good
    Lol yeah i.know what ya mean.we cld help ya but again dont know direction to send ya in without knowing what afr is doin.i run a csu hat as well which is why i mentioned trying the vent tube extensions.the way the hat is shaped internally it causes turbulence until the throttle is is open well.puttn the vents into the hat balances out the pressure in the bowls and helps it alot.is your hat clocked straight with carb or at a 3 or 9 oclock position?
    Last edited by IMPATIENT 1; 09-06-2013 at 06:34 PM.

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    I'm not familiar with the intricate differences between Holley and C&S carbs, but it sounds like the accelerator pump needs to be adjusted. Tip the throttle in w/o out a load no problem, put it in gear, tip it in, and it bogs... it's the first place I'd look.

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    Maybe a silly question, but why aren't you asking the guy's at CSU? I've talked to them a couple times and they've been easy to talk to.

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    Quote Originally Posted by neil450 View Post
    does any one have experience with blow through set ups I have a 750 4150 holly from CSU on a twin turbo sbc an it ran good on the dyno an now its in the car an it has a good stumble when accelerating I have never tuned this type of carb
    Quote Originally Posted by Budweiser View Post
    I'm not familiar with the intricate differences between Holley and C&S carbs, but it sounds like the accelerator pump needs to be adjusted. Tip the throttle in w/o out a load no problem, put it in gear, tip it in, and it bogs... it's the first place I'd look.
    Obviously you don't know the difference between a CSU carb and a C&S as well. Probably best if we don't mention C&J as well ugh?

    Odds are the dyno operator made no attempt to make a pull off idle under load. No uncommon really. If the stumble is just off idle when you tip in the throttle its probably nothing more than a larger shooter or accelerator pump cam.



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    Quote Originally Posted by gn7 View Post
    Obviously you don't know the difference between a CSU carb and a C&S as well. Probably best if we don't mention C&J as well ugh?

    Odds are the dyno operator made no attempt to make a pull off idle under load. No uncommon really. If the stumble is just off idle when you tip in the throttle its probably nothing more than a larger shooter or accelerator pump cam.
    I would tend to agree with GN.
    I assume that all of the slack has been removed from the accelerator cam lever so there is none. If the idle screws have been adjusted, it can introduce slack.

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    Seriously, just call Kevin.
    I just spent Tuesday morning with him, dialing my boat in, in his driveway. Ive known Kevin since we use to street race almost 20 years ago (we've grown up since then). He is a straight forward, customer service oriented vendor. I would of called him first.

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    Guys look up what happens when someone uncovers the tslots too mucb with a blowthru my guess is the idle got changed by adjusting frt idle screw which is a no no.idle is adjusted at secondaries especially on a bt carb.c n s csu qft it dont matter same symptom if ya over expose tslots.now ask the fella if he has turned up the idle by primaries, see whats said bt react different at the hit than na.mine did the same thing.a bigger shooter and more aggressive pump cam didnt help at all been there if he had a wideband he cld play with the idle mixture screws watxhing the wideband and if it reaczs quikly to idle mixture adjustment than its definately on the idle circuit not on the transfer slots.wideband is really required here to know tho.

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    Quote Originally Posted by Fireguy View Post
    Seriously, just call Kevin.
    I just spent Tuesday morning with him, dialing my boat in, in his driveway. Ive known Kevin since we use to street race almost 20 years ago (we've grown up since then). He is a straight forward, customer service oriented vendor. I would of called him first.
    X2. Go to the source

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