Would I gain anything from a fast 102?
06-09-2016, 04:03 PM
#1
Would I gain anything from a fast 102?
Base C6 with Ls2
PRC LS3 heads milled .030
Ls7 cam
Ls7 full exhaust
Vararam
Ls3 intake
Ls7 injectors
Currently at 430hp/401tq on a dyno jet at 12.5 AFR and 23-24 degrees timing.
My only hang up with that my cam is a 211/230 so its pretty small on the intake side.
I can do 3.90 gears for 850 total
Or buy a fast for a little more but with a much easier install.
What do you guys think?? What could I gain?
PRC LS3 heads milled .030
Ls7 cam
Ls7 full exhaust
Vararam
Ls3 intake
Ls7 injectors
Currently at 430hp/401tq on a dyno jet at 12.5 AFR and 23-24 degrees timing.
My only hang up with that my cam is a 211/230 so its pretty small on the intake side.
I can do 3.90 gears for 850 total
Or buy a fast for a little more but with a much easier install.
What do you guys think?? What could I gain?
06-09-2016, 04:24 PM
#2
Le Mans Master
I think you'd gain 20+RWHP with a Fast 102 on an LS2, they work magic compared to the factory intake.
06-09-2016, 04:57 PM
#4
Le Mans Master
On a LS3 I don't think a FAST manifold is worth the price of entry.
06-09-2016, 08:25 PM
#5
Melting Slicks
Member Since: Dec 2014
Location: Bossier City Louisiana
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I just ordered the fast 102 for my LS2 today. Should be a nice increase, especially in the lower part of the band. Vengeance Racing is offering free porting and shipping through the end of the month. I feel it was a no brainer for an LS2. 
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Victory05 (06-13-2016)
06-09-2016, 08:43 PM
#6
Safety Car
Get a ported ls3 manifold from ber or Rick Crawford for much less. I don't think the fast is worth it on ls3 heads.
Last edited by sevinn; 06-09-2016 at 08:44 PM.
06-10-2016, 05:33 AM
#7
You can just port a LS-2 intake to clean up the production flaws to pick up the 10HP its robbing you (around $300), or your can spend over the Grand on the fast intake to pick up around the same gains instead.
The only differences, you may pick up a HP or two in the mid range from the slightly longer runners on the Fast intake.
As for the LS-3 intake manifold, does not have the production flaws of the LS-2, and flows smoothly instead.
So with the fast, you may pick up a few mid range HP, or depending on the runners and how much it ported, may loose some HP in mid-range and pick some HP up at max rev's instead.
Hence like 243 heads, and although cleaning up the swirl channels will pick up some mid range HP, where as going to Buck wild to remove the swirl channels for the most part during porting, will increase your top end power, but at a cost of some mid range power isntead.
So on that note, before porting the LS-3 OEM intake to much, figure out where you want to pick up power isntead. If high rev's, then it can be enlarged ported to pick up some more HP top end, but may take a hit on mid range HP if over ported too much isntead.
06-10-2016, 12:41 PM
#8
Double edge sword.
You can just port a LS-2 intake to clean up the production flaws to pick up the 10HP its robbing you (around $300), or your can spend over the Grand on the fast intake to pick up around the same gains instead.
The only differences, you may pick up a HP or two in the mid range from the slightly longer runners on the Fast intake.
As for the LS-3 intake manifold, does not have the production flaws of the LS-2, and flows smoothly instead.
So with the fast, you may pick up a few mid range HP, or depending on the runners and how much it ported, may loose some HP in mid-range and pick some HP up at max rev's instead.
Hence like 243 heads, and although cleaning up the swirl channels will pick up some mid range HP, where as going to Buck wild to remove the swirl channels for the most part during porting, will increase your top end power, but at a cost of some mid range power isntead.
So on that note, before porting the LS-3 OEM intake to much, figure out where you want to pick up power isntead. If high rev's, then it can be enlarged ported to pick up some more HP top end, but may take a hit on mid range HP if over ported too much isntead.
You can just port a LS-2 intake to clean up the production flaws to pick up the 10HP its robbing you (around $300), or your can spend over the Grand on the fast intake to pick up around the same gains instead.
The only differences, you may pick up a HP or two in the mid range from the slightly longer runners on the Fast intake.
As for the LS-3 intake manifold, does not have the production flaws of the LS-2, and flows smoothly instead.
So with the fast, you may pick up a few mid range HP, or depending on the runners and how much it ported, may loose some HP in mid-range and pick some HP up at max rev's instead.
Hence like 243 heads, and although cleaning up the swirl channels will pick up some mid range HP, where as going to Buck wild to remove the swirl channels for the most part during porting, will increase your top end power, but at a cost of some mid range power isntead.
So on that note, before porting the LS-3 OEM intake to much, figure out where you want to pick up power isntead. If high rev's, then it can be enlarged ported to pick up some more HP top end, but may take a hit on mid range HP if over ported too much isntead.
06-10-2016, 07:49 PM
#10
Burning Brakes
My car went from 11.3@120 to 10.7@125 with the addition of a fast 102 on my bolt on ls3. Only other change was taking the airaid off for a vararam. And better DA. Peak numbers weren't anything to cheer about. Went from 408/408 to 417/402. It did pick up good after 5000 rpm which is where my car spends all its time. Id say my fast was worth every single penny.
06-11-2016, 08:36 PM
#12
Burning Brakes
Well in that case my buddy swapped a fast102 on his mild cammed ls3 and went from 10.9@126 to 10.5@131. Dyno showed he gained a peak of 5-6hp if I remember correctly.
For both of our ls3's we came to the conclusion the fast was completely worth it.
For both of our ls3's we came to the conclusion the fast was completely worth it.
06-12-2016, 04:51 AM
#14
Hence on the Fast, you can swap to the shorter runners to pick up some top end, but your going to get taxed on the low to mid range power isntead.
06-12-2016, 09:30 AM
#16
Melting Slicks
The ls3 intake on an ls2 is a great intake specially when match ported I would go with the gears and do intake later if you have to have it <BUT>
Your epic gain is in changing the cam.
Your epic gain is in changing the cam.
06-12-2016, 01:59 PM
#18
Burning Brakes
I should have the graph at home ill check when I get there. Its stock cam so im sticking with the longest street runners. I dont need any low end grunt for my car. It has a 4k stall and is essentially 5000 rpm plus the whole pass up to 7200 rpm