necrocannibal

iTrader: (5)

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.

necrocannibal

iTrader: (5)

Is the 85mm set up enough for this?

Mavmavv

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

necrocannibal

iTrader: (5)

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

9sectruck

iTrader: (9)

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

stevieturbo

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

necrocannibal

iTrader: (5)

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.

dschmittie1

iTrader: (64)

Yep my car has a stock 78mm Throttle body on it and has been 8.79@159mph

stevieturbo

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

necrocannibal

iTrader: (5)

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.

stevieturbo

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.

T/ALT1

iTrader: (3)

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.

necrocannibal

iTrader: (5)

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.

stevieturbo

There can be many reasons for a high dyno reading or indeed a low dyno reading.