Smaller throttle body on 102 intake
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Teching In
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Smaller throttle body on 102 intake i have run across 2 different Holley Sniper intakes for 102 throttle bodies at some pretty good discounts. I am building a mostly stock 5.3 but with a LS3 Cam, springs, and lifters. A 102 throttle body seems like overkill and besides, I would like to stay drive by wire. Is it possible to get adapters to put my stock throttle body on this intake? I can pick one up for about what I am seeing LS1 manifolds for and less than LS6 manifolds.
Thread Starter
Teching In
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The bolt patter for 90mm and 102mm TBs should be the same......so a 90mm TB should be able to bolt onto a 102mm intake with no problem.
Only thing is that you will see zero benefit of the 102mm intake with a 90mm TB.
KW
Only thing is that you will see zero benefit of the 102mm intake with a 90mm TB.
KW
manifold design isn't all about the opening. runner length, cross section, plenum volume all play a major role. if it's oversized for his app, it's because of those things, not the size of the throttle body.
What he is doing should work fine.
Only thing I advice against is adapting a 78mm intake to a 90mm tb. I did this on a LS swap for a customer. The larger tb opening made so much turbulence, that it had a crazy loud whistle to it. Sounded like a procharger at idle lol.
Only thing I advice against is adapting a 78mm intake to a 90mm tb. I did this on a LS swap for a customer. The larger tb opening made so much turbulence, that it had a crazy loud whistle to it. Sounded like a procharger at idle lol.
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But thanks all the same.
KW
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What he is doing should work fine.
Only thing I advice against is adapting a 78mm intake to a 90mm tb. I did this on a LS swap for a customer. The larger tb opening made so much turbulence, that it had a crazy loud whistle to it. Sounded like a procharger at idle lol.
Only thing I advice against is adapting a 78mm intake to a 90mm tb. I did this on a LS swap for a customer. The larger tb opening made so much turbulence, that it had a crazy loud whistle to it. Sounded like a procharger at idle lol.
It would benefit it. But my customer ordered a 90mm tb and had a 78mm truck intake. So thin we used an adapter for it to bolt up. So basicly u have a 90mm opening reduced to a 78mm hole. To much air turbulance.
Really? There was a pretty big differnce on my ls2 going from the stock intake to the fast 102 while keeping the stock 90 mm throttle body. I didnt dyno my results but plenty on the vette forums have and 20hp+ gains are pretty typical.
Why?
Because the benefit you got was not because you went a 102mm FAST intake, it was because you went from an OEM LS2 intake to a FAST intake.
One day, when you swap in a 102mm TB.....you may see even more improvement if your setup has the ability to use the additional airflow.
KW
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From: Coast of San Mateo County Between Pacifica & HMB
Runners compared to the FAST 92. A FAST 102 with a 90 or 92
MM TB will out perform a FAST 92, 90/92 TB combo on even
a modest HC combo (especially with
A velocity ring), and be easier to tune VS 102 TB. 90 MM TB
is not a significant limiter (6-8 HP) until ~ 650 HP @ Flywheel.
I disagree, as stated the FAST 102 Intake has improved plenum & Runners compared to the FAST 92. A FAST 102 with a 90 or 92 MM TB will out perform a FAST 92, 90/92 TB combo on even a modest HC combo (especially with A velocity ring), and be easier to tune VS 102 TB. 90 MM TB is not a significant limiter (6-8 HP) until ~ 650 HP @ Flywheel.
KW