How much power am I leaving on the table?

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Apr 3, 2013 | 01:55 PM

necrocannibal

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How much power am I leaving on the table?

I have a car with a 383 and twin t60s on it built by someone else, I bought it off of here. Anyway the builder used a BBK 85mm throttle body and intake. The car put down right at 660 on about 14 psi and was just curious as to what gains to expect if I went to a Fast 102 setup.

Apr 4, 2013 | 02:03 PM

necrocannibal

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Is the 85mm set up enough for this?

Apr 4, 2013 | 02:16 PM

Mavmavv

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Im no expert, but guys are making more power on stock TBs that are 78mm. I think the 85mm should be fine.

Apr 4, 2013 | 04:10 PM

necrocannibal

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Quote:

Originally Posted by Mavmavv

Im no expert, but guys are making more power on stock TBs that are 78mm. I think the 85mm should be fine.

So moving to a 102 mm intake and throttle body wouldnt gain any power?

Apr 4, 2013 | 04:45 PM

9sectruck

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From: jefferson city MO

No, you have volume from the turbo cramming it in the intake

Apr 4, 2013 | 05:11 PM

stevieturbo

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From: Norn Iron

Quote:

Originally Posted by necrocannibal

Is the 85mm set up enough for this?

It would do double your power before it'd be a concern

Apr 5, 2013 | 08:39 AM

necrocannibal

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Wow I never would have guessed that. I assumed it would be a bottleneck trying to shove air through too small of a hole. Thanks for the info, saved me some money/experimenting.

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Apr 5, 2013 | 09:12 AM

stevieturbo

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From: Norn Iron

Quote:

Originally Posted by necrocannibal

Wow I never would have guessed that. I assumed it would be a bottleneck trying to shove air through too small of a hole. Thanks for the info, saved me some money/experimenting.

Your 85mm TB is probably bigger than your boost plumbing ?

Apr 5, 2013 | 09:14 AM

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necrocannibal

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From: Memphis,TN

Quote:

Originally Posted by stevieturbo

Your 85mm TB is probably bigger than your boost plumbing ?

To be honest I haven't really looked too hard at everything, it has rained almost everyday since I have ownned the car and it has been in my garage. I will definitely check it out this afternoon though.

Apr 5, 2013 | 09:20 AM

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stevieturbo

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From: Norn Iron

Quote:

Originally Posted by necrocannibal

Typically most will use 3". ie 76mm OD. It's readily available and a good balance between airflow and being a size that will physically fit in most engine bays. Some may go bigger, but for even just north of 1k, 3" is still fine.

So fitting a TB much larger than that....really, it's kind of hard to justify with any real logic. As a 102mm TB is going to be restricted by the boost plumbing, so makes it pretty pointless.

Apr 5, 2013 | 09:28 AM

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T/ALT1

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Yeah save your $1,200 and spend $400 of it on a Alky/water injection setup so yoiu can turn up the boost and make more HP.

Apr 5, 2013 | 09:35 AM

#13

necrocannibal

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From: Memphis,TN

Great info, thanks for taking the time to explain it and it does make total sense. I just assumed the car would make more power than it does at 14 psi. Maybe my cam is an issue, its an off the shelf Comp cam 224/224 114.