lmt0705

iTrader: (7)

im wonderong if its worthwhile to upgrade from my stock 78mm TB, what kind of additional power would I be looking at

stevieturbo

if boosted, probably none IMO.

FootLbs

iTrader: (7)

I was wondering same thing... How benificial could a larger TB be?...

Shawn @ VA Speed

iTrader: (3)

it all depends on your mods,if your making 1000rwhp-yes,but we have made over 600rwhp with stock tb's

EPP

iTrader: (22)

We're making 740 rwhp (Mustang Dyno to boot) with stock maf, stock throttle body, shorty headers and factory cats on this Corvette.
http://www.exoticperformanceplus.com...Car.php?car=40 Bob

lmt0705

iTrader: (7)

has anyone tried a run by run comparison to see what kind of gains are possible?

qqwqeqwrqwqtq

On one car that was making 850rwhp with the stock throttle body, I swapped it with a 90mm (tapered to match up with the ls6 intake) and it picked up only 6rwhp. At that level could have just been a variance between runs.

ChevyChad

iTrader: (50)

I can't see the TB being a restriction as long as it is as big or bigger than the intake pipes. So unless you are running 3.5" pipe to the intake to warrant a 90mm TB, it seems worthless IMO...

lmt0705

iTrader: (7)

i guess ill save myself the 300 bucks or more and put it into a new set of rims if I can ever find something I like

fenix999

iTrader: (17)

I was also thinking about this but alittle more, as in bigger maf, bigger throttle body, and bigger intake manifold.? Would say a LS2 90mm intake manifold and a 85 or 90mm TB outperform a stock 75/78mm application by much? And this application would be a turbocharged one under 650rwhp
Ideas or opinions would be much appreciated THANKS

ls1290

iTrader: (20)

I agree unless your intake needs one like a LS2

Keith

stevieturbo

Even if the intake needs one...I still dont think anything larger than stock is necessary until in excess of 1000rwhp.

In fact, even at that....whether its necessary or not could still be in dispute.

Pro Stock John

iTrader: (34)

My thinking with my turbo setup was to go 90mm and then I knew it would be as good as stock and not be a restriction. Usually I see 105mm stuff on 7 second and faster cars.

WAHUSKER

iTrader: (4)

Even the simple math supports this - 500rwhp easy on an NA motor with a 78 so doubling the air (15 psi) it should be good for 1000....

platinum1

iTrader: (7)

well on my boosted car i am puting on a beck sheet metal intake and my tb is 105 mm.

stevieturbo

The only thing fitting a larger TB does, is reduce throttle resolution on a FI car. ( would be most noticeable on a turbo car )

PHIL H

iTrader: (13)

Seen quite a few 7 sec turbo cars with 90mm's.

Shawn @ VA Speed

iTrader: (3)

I went 7.20's at 3300lbs with a 90mm tb

stevieturbo

The Supra and Skyline guys seem to love huge TB's too....I just dont get it.

lmt0705

iTrader: (7)

so is it the concensus here that if im looking at around 800 rwhp thru an auto it would not be any kind of a significant gain to warrent spending the money?