FAST 90 and small cam results..
Thread Starter
Joined: Apr 2005
Posts: 1,014
Likes: 0
From: san marcos, TX
I'm not sure. But the XER cam lobes are alot more aggresive. More lift and duration under the curve. That makes a difference. I think the whole combination works well together. Without the cam change I bet the car would have made right at 400rwhp...
Gotcha, HP curves look similar as neither noses over. I see you bumped the fuel cutoff up a couple hundred rpms for the after dyno pull. If there were a way to overlay the two graphs, we could compare gains in the midranges. Appreciate the info...
Thread Starter
Joined: Apr 2005
Posts: 1,014
Likes: 0
From: san marcos, TX
Fuel cut off is 6700rpm. 03' Vetts have the LS6 short block with the better rod bolts...The smaller cam (TPIS Z-11 215/220 .559/.557 112LSA)just didn't keep pulling, it was nosing over by 5700rpm. The extra 7 degs intake and 8 degs exhaust duration and more lift really woke up the motor..Its the whole combination together that work well...I still wish he would have switched heads to some CNCd 5.3L heads so I could have used the larger 228/236 .588/.602 114LSA cam I wanted to...The increase compression and tighter LSA would have really boosted his torque and midrange and his peak hp would have been around 450...
I hear ya. The '03 Vettes and '04 GTO's have the same version of the LS1; that is to say LS6 shortblock and intake manifold with LS1 cam and heads. That's why I was interested in your results with the 90/90. Sounds like my CheaTR (215/232 598/579 on a 118LSA) is a tiny bit larger than your TPIS cam - and a bit more of a high rpm cam. My heads flow a bit more, 300cfm @ .600, if I remember right, and have the stock LS6 hollow stems. I, too, bumped cutoff to 6700, HP peaked at 6200 for my combo (w/o underdrive pulley).
I was just trying to do some research on the FAST 90/90 combo and debating whether to pull the trigger...
Thanks for all the info...
I was just trying to do some research on the FAST 90/90 combo and debating whether to pull the trigger...
Thanks for all the info...
the curves don't look to much different, this is making me think twice about geting a ported fast 90 now. you lost some low end tq? was this because of the cam or intake?
Last edited by 99zman; Jan 1, 2008 at 04:48 PM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Staging Lane
Joined: Nov 2007
Posts: 92
Likes: 0
From: Westmont
I knew I'd lose some torque by going with a FAST (only stock internals for now), but I love top end, and the LS2 intake isn't exactly free-flowing. That's why I'm keeping my FAST unported.
Thread Starter
Joined: Apr 2005
Posts: 1,014
Likes: 0
From: san marcos, TX
the low end loss has alot to do with the change in LSA and different valve events.. 112 LSA to a 118 LSA,
Staging Lane
Joined: Nov 2007
Posts: 92
Likes: 0
From: Westmont
I just got my car dynotuned. Stock internals, just had a CAI, the FAST w/ stock unported throttle body and MAF, underdrive pulley, Kooks/catted mids, and a StolenFox H-pipe.
I put down 382.5/387 on a Dynojet. I don't think the FAST kills as much torque on LS2's.
https://ls1tech.com/forums/dynamometer-results-comparisons/839535-stock-internal-a4-06-gto-382rwhp.html
I put down 382.5/387 on a Dynojet. I don't think the FAST kills as much torque on LS2's.
https://ls1tech.com/forums/dynamometer-results-comparisons/839535-stock-internal-a4-06-gto-382rwhp.html
