Comptech 4.3" 9lbs Supercharger Pulley where to buy?
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From: Huntington Beach
Comptech 4.3" 9lbs Supercharger Pulley where to buy?
Does anyone know where to by a Comptech supercharger pulley to develop 9lbs of boost.
As best I can tell the pulley should be about 4.3" diameter. I know Comptech doesn't endorse this pulley but I would still like to try one.
As best I can tell the pulley should be about 4.3" diameter. I know Comptech doesn't endorse this pulley but I would still like to try one.
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From: Huntington Beach
Yep!
To develop 25-30 hp for the price of a pulley sounds like a bargan.
I have a Comptech aftercooler on order and should be able to get to 8-9lbs without problems.
I am expecting a small drop from my 6.7lbs to near 6 and could use a boost back up to other competitors boost numbers.
To develop 25-30 hp for the price of a pulley sounds like a bargan.
I have a Comptech aftercooler on order and should be able to get to 8-9lbs without problems.
I am expecting a small drop from my 6.7lbs to near 6 and could use a boost back up to other competitors boost numbers.
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From: Ranson, WV
4.375 pulley on mine puts down about 6.8 lbs boost
4.25 pulley yellow streak had on his was something like 7.4 lbs before he added custom aftercooler and went smaller to get back some boost...
i have a 3.875 that we never put on because we felt we could not control things that well with just the VAFC/FPR on my car and we would wait for AC.
to get 8 lbs of boost you will probably need to go down to something like a 4.00 or smaller pulley, and to get to 9 lbs it may take something smaller than a 3.5. APS makes a 4.375, 3.875 and 3.5 pulley. I think they will also make custom sizes.
keith
4.25 pulley yellow streak had on his was something like 7.4 lbs before he added custom aftercooler and went smaller to get back some boost...
i have a 3.875 that we never put on because we felt we could not control things that well with just the VAFC/FPR on my car and we would wait for AC.
to get 8 lbs of boost you will probably need to go down to something like a 4.00 or smaller pulley, and to get to 9 lbs it may take something smaller than a 3.5. APS makes a 4.375, 3.875 and 3.5 pulley. I think they will also make custom sizes.
keith
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From: Ranson, WV
a little extra boost, a little more heat on IAT. am running on 93 octane pump gas. had it on the dyno and adjusted A/F with VAFC, no pinging, runs fine. it is my daily driver and has had the 4.375 pulley since early this year with no problems.
i really wanted to try out the 3.875, but the tech expressed concerns over what we could do with the VAFC, i.e. no spark advance adjustments, so we never even put it on. he does this a lot more than me and i have no desire to blow the engine, so i stayed on the safe side.
keith
i really wanted to try out the 3.875, but the tech expressed concerns over what we could do with the VAFC, i.e. no spark advance adjustments, so we never even put it on. he does this a lot more than me and i have no desire to blow the engine, so i stayed on the safe side.
keith
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Thanks for the input.
I contacted ASPRacing today and purchased 4 pulleys 4.2,4.1,4.0,3.9 which equals to 7.5,9,10.5,12psi and will find out how far I can go without a management system other than a VAFC. This thread was very helpful in kicking up the boost. I will have three pulleys for sale after I am done if anyone is interested.
I contacted ASPRacing today and purchased 4 pulleys 4.2,4.1,4.0,3.9 which equals to 7.5,9,10.5,12psi and will find out how far I can go without a management system other than a VAFC. This thread was very helpful in kicking up the boost. I will have three pulleys for sale after I am done if anyone is interested.