Fast 102 to big?
Thread Starter
Drifting
Joined: Oct 2012
Posts: 1,585
Likes: 28
From: Cedaredge Colorado
Fast 102 to big?
Currently have fast 92, ls2 TB, with small street cam and ported 243 heads. Stock Z06 manifolds and xpipe into b&b bullets. Stock ls1 block.
I have purchased LG G3 cam,double springs and a set of lg long tubes Ned off road xpipe.
I was thinking of while doin cam to go with a fast 102 and NW102tb all at the same time.
To much intake?
Thanks
I have purchased LG G3 cam,double springs and a set of lg long tubes Ned off road xpipe.
I was thinking of while doin cam to go with a fast 102 and NW102tb all at the same time.
To much intake?
Thanks
Last edited by Cedarberry; Nov 6, 2015 at 06:32 AM.
Racer
Joined: Jul 2009
Posts: 254
Likes: 36
From: Rotonda West, Florida
2020 C5 of the Year Finalist - Unmodified
Spoke to a few knowledgeable guys before my Fast purchase, one an avid racer and a sponsor here. Both recommended the 92 so that's what I went w/. Also had it ported. Apparently the 102 is a better overall design and still gives you 5 or so hp more. Either way I'm happy w/ my choice.
Melting Slicks
Joined: Nov 2009
Posts: 2,922
Likes: 219
From: West Branch, MI
http://ls1tech.com/forums/generation...ts-inside.html I have heard that the 102mm TB is harder to tune.
Thread Starter
Drifting
Joined: Oct 2012
Posts: 1,585
Likes: 28
From: Cedaredge Colorado
Installing a higher rpm cam, so that's the reasoning behind adding the 102, to go along with the cam. Hopefully get that 9 extra HP along with headers and cam I should get to 450rwhp. Currently at 402rwhp. Be close.
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Well.....I don't want to tech ramble, but....
In an EFI configuration, the larger the plenum the better. Regardless of effective rpm window, matter of fact no plenum is best.
All the "science" is in the intake tract (intake runner & the runner in the head). Effectively from the valve face to the intake runners bellmouth....total length/ taper/ CSA..etc.
So, the question seems to be....what is the difference in the runners between the Fast 92 and the 102 ??
Carbs need plenum for signal.
Fyi, I've never seen a 102 lose power to a 92...in any circumstance. Especially if it's an auto car.
And of course, filtration and throttle control dictate OEM and majority of aftermarket designs.
.
In an EFI configuration, the larger the plenum the better. Regardless of effective rpm window, matter of fact no plenum is best.
All the "science" is in the intake tract (intake runner & the runner in the head). Effectively from the valve face to the intake runners bellmouth....total length/ taper/ CSA..etc.
So, the question seems to be....what is the difference in the runners between the Fast 92 and the 102 ??
Carbs need plenum for signal.
Fyi, I've never seen a 102 lose power to a 92...in any circumstance. Especially if it's an auto car.
And of course, filtration and throttle control dictate OEM and majority of aftermarket designs.
.
Last edited by LSOHOLIC; Nov 7, 2015 at 01:58 PM.
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Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Typically large intakes and larger than stock T-Bodies only work well on larger cubic inch engines and/or engines that consistently run above 6500 RPM---That's where they can make some added HP----IF you car does not fit any of those scenarios then you would be better off with the 92 intake and a stock ported T-Body---Smaller intakes create more port velocity which is the key ingredient for making lots of TQ--A large intake slows down the velocity so much below 6000 RPM's that you may actually lose HP and TQ --all depends on how you use your car and it's size
Melting Slicks
Joined: Sep 2007
Posts: 2,136
Likes: 139
From: Port St Lucie Florida
http://ls1tech.com/forums/generation...ts-inside.html I have heard that the 102mm TB is harder to tune.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Tuning is not the issue---any tuner can make any combination start-run idle and run fine--The major issue is if that combination is making more HP and TQ than before--And where it's making it at----If it makes max HP at 6500 and you don't run it that high consistently then you aren't getting any advantage same goes for where the max TQ happens