twin turbo carb question
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twin turbo carb question

  1. #1
    Senior Member KLINGER's Avatar
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    Default twin turbo carb question

    i have a banks twin turbo kit i just purchased an was wondering if theres anything i need to do to the carb like boost reference or just leave it the way it is. its a draw through turbo kit and i have an 850 holley. thanks

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    pm hass828, he's runnin a similar set-up , i think he's boost referencing the fuel pressure, not sure about the pv's.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

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    Amber Racing Services BUSBY's Avatar
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    Call the guys @ CSU Carbs at (909) 851-6955

    17367 Reed St. • Fontana, CA 92336

    They know turbo carbs.


    Brian

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    Senior Member KLINGER's Avatar
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    i'll give them a call. what about the rest of the fuel system as far as fuel pumps and regulators, etc. im not going crazy hp just a stock 454 .30 over with the 550 hp banks kit. any reccomendations on types of fuel pumps and anything different i should know im entering uncharted territory and any help is appreciated. thanks

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    senior member turbo wog's Avatar
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    Default klinger

    i have the gale banks set-up also . my 850 holley was not boost refrenced & it ran great. after i started modifying my motor the carb got too small & actually started gaining vacuum on the top end & was starting to close my power valves thus leaning the motor out.i ran 2 powervalves .yes run them ! i have never blown one out on my set-up & as mild as these turbo motors are you need a good small jet in the primary as not to flood the thing out & foul plugs. but when the turbos kick in you need powervalves kicking in & bigger 2ndary jets kicking in ! i am running both powervalves over drilled to .120 & i am running 110 2ndary jets!! the metering block was drilled as to run alcohol . but the primary jets are too big right now & i am running like @ 91's it a little fat but i've been doing test & tune on the bottom so i didn't want to mess with the a/f ratio yet .wot it is perfect. i also had to run bigger needle & seats #150 the fuel pump i ran with my 850 holley was the holley black, it was tooo small after i put the 1150 holley on . i also had to put a bigger pick-up tube in the fuel tank & run # 10 & #8 fuel lines with a holley volumetric/regulator system one inline fuel filter there are probably better fuel pumps & regulotors though , but for stock it should be affordable.i also rebuilt the turbos recently myself... give me a call or p.m me if you need those part #s still . the flange bearings & the back plates went bad in mine & a ring (here's the ring # cf600305-0000 @ $29.00)

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    Senior Member KLINGER's Avatar
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    WOW thanks wog thats what i was looking for! how was it rebuilding them? doesnt seem like much the ones i have are just plugged up with carbon and crap from sitting i was thinking of just going through taking them apart and cleaning them out. local turbo shop wants $350 a piece to rebuild id like to save my money if i can

  8. #7
    senior member turbo wog's Avatar
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    Default klinger

    Quote Originally Posted by KLINGER View Post
    WOW thanks wog thats what i was looking for! how was it rebuilding them? doesnt seem like much the ones i have are just plugged up with carbon and crap from sitting i was thinking of just going through taking them apart and cleaning them out. local turbo shop wants $350 a piece to rebuild id like to save my money if i can
    first you need a snapon allen head ,socket style if you dont there will be that one or two allens that strip out! i twisted my generic tools , all of them , like 6 or 7 of them. then make absolutly sure that allen is ALL THE WAY IN& straight !!!!!!!OR IT WILL STRIP ONE .anyway count the threads on your clamps ,on each turbo & write it down in a log book .separate them far enough apart you don't mix up the parts ,then if you get lost on one ...the other is right there. penatrating oil might not hurt either when pulling the allen heads out ,you might need the long allen tool,socket style.you'll need a gasket between the compressor & center housing, the gasket on my turbines were o.k. . when you get to the part where you have to take the impeller nut off look on the nut & end of the shaft for a very good mark that line them up! it should be there because they can't ballance it with it in the housing so they mark it & pull it apart & get it back together as close to the mark as possible.make the marks better if the're faint . don't mark it with a pen or paint . i did & it came of & it cost me $75 each to get them reballance. i used an ingraver with a very steady hand & made good line to line up. then go ahead & pull it apart . i think it is a reverse thread. kind-of get a idea how tight they put it on . exaust side is 5/8 cant remember the compessor side. there is a carbon seal on the compressor side that cost $350each !!! be carefull if its not broken i guess your o.k. i reused one of mine & one was broken & got a used one by luck. on the turbine side on the shaft you should see a little ring, replace that! my aluminum flange bearing was wiped out, the thick thrust washer ate into the aluminum flange bearing @$59 there is also a little tin like clip that goes with the flange bearing that should be replaced , i didn't do it on mine but probably should have?.my backing plate /Heat shield on the exaust side was broke also. they have aviation quality backing plates that are cast ,not stamped metal. if yours are o.k. i would use what you got you can always put the bucks in them if you even need to later .get ahold of me for the part #s i dont have them handy right now . also if you have someone that will rebuild them for $350 let me know who it is cause the probably have some parts laying around & i couldn,t find ANYBODY TO GET PARTS from used & OR TOUCH THEM ! THATS HOW I FOUND AVIALL. BUT THEY ASKED ME WHAT I NEEDED & i didn't know i called like three times & no one could help me without part #s so i finally found a guy that had part #s but no parts so i orderd & crossed my fingers & walla , i think i know how to rebuild a turbo . i missed some steps but those parts i mentioned are real important. & its been a few months since i looked a my tubos, good luck

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