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Old 01-07-04, 10:21 PM   #1
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best carb for blow thru turbo setup

i am ready to turbo my 12A and was wondering which carb to use. i was going to use my R.E. dual DCD's but nobody makes a carb hat for it. so now i want to buy another carb and intake manifold. any suggestions would help. thanks
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Old 01-07-04, 10:42 PM   #2
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holley 600/650 with rb manifold
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Old 01-08-04, 12:11 AM   #3
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weber dcoe's seem to be popular, and thats what I'm using for my blowthrough setup. cant really say if it's better than any other setup, I dont have the experience
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Old 01-08-04, 12:26 AM   #4
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How does the RE dual carb run? You can always have a good welder make the hat for you.
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Old 01-08-04, 02:30 AM   #5
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go with a weber 48 ida
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Old 01-08-04, 10:25 AM   #6
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48ida
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Old 01-08-04, 11:38 AM   #7
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the R.E. dual's are pretty good in the low's and mid's not all that good in the top end.
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Old 01-08-04, 12:31 PM   #8
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plus the RE's just look cool
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Old 01-08-04, 01:20 PM   #9
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Weber 48 DCOE is probably the best. The IDA is a better carb for N/A, it flows nicer. But when you use a turbo, it forces the air through either way so the slightly better flow of the IDA isn't worth the cost difference.

I havn't heard much about the holley, but I think it drives smoother and gives you a bit better mileage than the weber, but doesn't make as much top end power.

The nikki is probably the worst on gas out of the 3, but it drives smooth and gives good power. It should also be easy to tune, the only difficult thing is getting rid of a small bog when you suddenly floor the pedal.

So, the nikki is cheapest by a couple hundred $. The weber is $550 for the 45dcoe(best for stockport) and $675 for the 48dcoe(best for streetport) from rotaryshack. And the holley is about $800 from racingbeat. Decide for yourself which one suits you best.

Last edited by coldy13; 01-08-04 at 01:22 PM.
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Old 01-08-04, 02:18 PM   #10
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Quote:
Originally posted by krazy_1st_gen
the R.E. dual's are pretty good in the low's and mid's not all that good in the top end.
the chokes probablly just need to be enlarged by 1mm each to get more top end..

or if you want to keep good low and midrange, just enlarge the chokes on the secondaries.
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Old 01-08-04, 07:18 PM   #11
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i wonder how well my Carter will do... and if anyone makes a hat for it...
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Old 01-24-04, 01:27 PM   #12
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I would go with Holley for sure. Webers do well also,.....

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Old 01-24-04, 05:27 PM   #13
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Just found out a bit more about using a weber 48ida for blow thru, IT DOESN'T WORK. Well, it kinda does, but the floats are hollow and will get crushed after a couple minutes, and if you try to fill them to make them solid, they no longer work right and it'll run like complete ****. If you want a weber for blow thru, stick with the DCO.
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Old 01-24-04, 05:35 PM   #14
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What are you filling them with coldy? I've seen IDA's work fine, although i would prefer the dco anyway.

-Marques
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Old 01-24-04, 09:27 PM   #15
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You need to change to the plastic floats if it isn't already.
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Old 01-24-04, 10:16 PM   #16
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what about mikuni
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Old 01-24-04, 10:40 PM   #17
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hey coldy13 where did you get that run for **** info? I knew about the hollow float though..
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Old 01-25-04, 12:11 AM   #18
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The floats on my WEber 45 dcoe are the new-style plastic hollow floats. Is this going to be a problem for use on a blow-through setup? I just rebuilt the carb, so I have a better understanding of how it works, but are the brass floats such that they will fit right up to newer dcoe's?
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Old 01-25-04, 12:16 AM   #19
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Quote:
Originally posted by coldy13
I havn't heard much about the holley, but I think it drives smoother and gives you a bit better mileage than the weber, but doesn't make as much top end power.
Well, today I made 370+ to the rear wheels on my FB running a Holley Blow Through, if you wanted some other input.
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Old 01-25-04, 12:24 AM   #20
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Will the brass floats in a 48 IDA be able to handle 6 lbs before getting crushed? Also is Robert at rotaryshack on vacation? I have pm'ed and called but no answers.
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Old 02-22-04, 03:00 PM   #21
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Quote:
Originally posted by coldy13
The nikki is probably the worst on gas out of the 3, but it drives smooth and gives good power. It should also be easy to tune, the only difficult thing is getting rid of a small bog when you suddenly floor the pedal.

wait wait... so the RX-2 nikki carb. i have right now actually consumes more fuel than the 48 DCOE and IDA carb. setups? While the holley reigns top on gas mileage? How come the nikki would consume more fuel?
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Old 02-22-04, 03:06 PM   #22
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Well, my blowthrough nikki is getting 8mpg right now, and I know people with webers are getting 10-15mpg. I'm really not sure why though. I'll be switching to a Weber 48 DCO-SP soon, so I'll be able to compare the two first-hand.
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Old 02-22-04, 03:08 PM   #23
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Quote:
Originally posted by seanrot
hey coldy13 where did you get that run for **** info? I knew about the hollow float though..
I found that out from Robert. He tired to use the IDA, but the floats would always get crushed. So he filled them with an expandable foam to make them solid, but doing that changed their bouyancy(sp?) so it ran like ****.
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Old 02-22-04, 03:27 PM   #24
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A modified Nikki will be the most tunable out of all of them.
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Old 02-22-04, 04:02 PM   #25
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Quote:
Originally posted by coldy13
I found that out from Robert. He tired to use the IDA, but the floats would always get crushed. So he filled them with an expandable foam to make them solid, but doing that changed their bouyancy(sp?) so it ran like ****.
it runs shitty on low RPM due to not having enough progression hole. You have to remember that the IDA's are designed for full racing only. but to make it streetable, VW guys will add 1 more hole for better transition. Yes, the brass float needs to be filled in with expandable foam.

When Im ready to do the blow thru conversion, I will play with the IDA. Depending on what JC enterprises recommend, I might end up with 4 progression holes since they have done turbo VW with IDA. Plus, I have one more idea to add-in for fuel enrichment. Also, there is another crew here in LA who are currently experiementing with IDA. Got to learn from their mistakes....including my own.
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Old 02-22-04, 04:02 PM
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