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carb question

Old 12-04-05, 07:55 AM
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carb question

me and a friend of mine were building a circle/road track first gen rx7 and me another friend of mine were having a discustion because i think a weber carb is better for what were doin that a holley setup and my other friend is telling me that a holley will work better if you put a good pump on it and i want somebody experieced opinion about this because i know that holley are great for drag racing, i know because i have a holley myself and when i corner hard, it leans out. and weber expierience was with blowthru and i never had a N/A weber setup. so please i need some opinions about it whats best for this.

BTW the car gonna have a 13B N/A stock ports because of the rules and were still thinking of were gonna build one or just get a used one and rebuild it thanks
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Old 12-04-05, 08:17 AM
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the dellorto has better hp output throughout the usable power range. the holley lags behind except in the last few hundred rpm where it peaks above the dellorto. you should go with a straight manifold for the dellorto or webber. they don't lean out like the holley around corners but i think you can get a kit to help the holley with this. use holley pump and regulator.

Last edited by rotariesrule; 12-04-05 at 08:20 AM.
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Old 12-12-05, 07:15 AM
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Eddie- What type of racing are you going to be doing... I know you said Drag/road race- However I know that SCCA will not allow you to run a holly or webber for that matter in IT-7 or ITA. If your going for a production car- Then it doesn't matter... Also... just an odd question... but building a road race/drag race car... Isn't that two totally different cars?! :P
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Old 12-28-05, 09:56 PM
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no is a circle/road race car, i dont know what SCCA races my friend os gonna race but our track they alow any mod as long the ports are stock, and now were are planning to build a engine using diferent stuff of other engines. i know alot about drag racing, i dont know much about road/circle racing in what setup i should used
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Old 12-29-05, 10:07 AM
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No Holley 4 barrels allowed in SCCA Production or GT road racing, because I think the rules say one carb barrel per rotor, so you can only have a 2 barrel. Everyone runs the Weber 48IDA downdraft carb in SCCA racing; that type carb has won a LOT of races.

For a 4 port or 6 port motor, you could probably get a little more power out of a 4 barrel.

Before building any kind of race car, you better know the rule book forward and backwards.
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Old 01-04-06, 05:39 PM
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[QUOTE=Before building any kind of race car, you better know the rule book forward and backwards.[/QUOTE]


An absolute must. You need to know what you can and can't do- There have been many people who have built cars to make them fast... and sometimes fast isn't always legal! Course...sometimes people build illegal cars.... lol... we will not go there! Best of luck!
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