stock ls3 VS 102 FAST intakes
10-31-2011, 12:26 AM
#23
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On a buddies 408 we did in his silverado, the vic jr was an instant win over the composite manifold. Granted its a 4bbl tb setup, but response is wicked and power was greatly improved from 5k rpm and up. This was on cathedral ports though.
On the ls3 vs fast, I think it sucks to spend that kind of dough on the intake, then unload who knows how much more on porting and a throttle body to get the gains you would think you'd see just from a manifold swap. I know the factory pieces are getting better and when it comes down to an all out setup, obviously money isn't going to matter. But for the average joe on a street ride, that 12-1500 can be spent on a helluva lot more goodies to net much better gains imo.
On the ls3 vs fast, I think it sucks to spend that kind of dough on the intake, then unload who knows how much more on porting and a throttle body to get the gains you would think you'd see just from a manifold swap. I know the factory pieces are getting better and when it comes down to an all out setup, obviously money isn't going to matter. But for the average joe on a street ride, that 12-1500 can be spent on a helluva lot more goodies to net much better gains imo.
11-01-2011, 02:47 PM
#25
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Did GM ever cast these PN 19244034- shows up on GM parts direct. Just a thought.
We dynoed last Friday at LMR and the 76 on our car peaked at 6000, it made good torque from 4000 till shut off. We carried it out to 6600 but it was nose diving. I'll scan it and post it when I get home.
We dynoed last Friday at LMR and the 76 on our car peaked at 6000, it made good torque from 4000 till shut off. We carried it out to 6600 but it was nose diving. I'll scan it and post it when I get home.
Last edited by 1lejohn; 11-02-2011 at 04:01 PM.
11-01-2011, 04:51 PM
#27
Port the stocker if ya want but dont bother buying the fast. I did the swap and gained nothing. Im sure If V.S. or mamo went through it there would have been gains but at an extra cost. Not worth it for me. Its too bad. Ive always enjoyed nice gains with fast intake on my ls1 and ls2`s. I guess the fast ls3 is just a dud
11-01-2011, 04:54 PM
#28
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I switched from a ported LS3 intake to a FAST 102 on my G8 and only gained 4rwhp up top and lost about the same down low. I dont really think the FAST is worth the $$$ unless it is a max effort build. I took it off and sold it. 4rwhp is not worth almost $1000.
11-08-2011, 01:08 PM
#31
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11-08-2011, 02:22 PM
#32
One of our local guys just saw gains similar to my car going from a ported LS3 to the LSXR 102mm. Peak to peak gains were 17whp/13wtq with 18wtq gains in the midrange... however the LSXR manifold carried the powerband out another 500RPM and the gains on the top end where the LS3 manifold dropped off were approaching 35whp at 6500RPM. That was with a mild cam and ported/valve job heads, I saw roughly the same gains with a big cam and ported/valve job heads.
11-09-2011, 01:26 PM
#35
Then you got bad data, period.
The intake always makes power, if it doesnt someone isnt doing something correctly. Ive installed a TON of these manifolds on many different vehicles. The reoccuring theme I see with a FAST manifold is that it is even with an OEM intake until 3500, at 3500 it starts quickly gaining power over the stock piece.
The LS3/L92 version is certainly has the least gain over the stock intake, but FAST only claims 14hp & 11lbft. I typically see exactly that! All the other intakes they give a range, but the LS3 version specifically says 14/11. There are no mysteries.
EVERY ported OEM LS3 manifold I have ever seen tested has LOST power. Only the sales pitch dyno graphs ever show a gain.
As far as the edelbrock line of manifolds, I have tested them personally as well. Ive tested the Vic Jr with a 4150 FAST throttle body, and the Pro-Flow XT. Both lost dramatic torque below 5500 RPM. Were talking 40-60lbft which makes the car feel like a turd. After 6500 the Edelbrocks start to pull away from the FAST. On a typical engine (400-525hp) I would see a 10hp gain over the FAST at the very peak of the RPM range. This makes for good bragging right on forum sigs and dyno wars that only look at a single peak number. On Higher RPM engines I have seen edelbrocks make 20hp over a FAST, but only at 7000+ RPM, they still loose 40-60lb ft where you drive 99% of the time.
In the end...... If you drive at all on the street, you want a FAST. If you drage race, only pull of a trailor and drive to the starting line and leave the line at 5500+ then a Edelbrock may be a good fit for you. Its all about combination.
Here are some dyno results of FAST LS3;
100% Stock Pontiac G8, no tune
100% Stock 2010 Camaro, no tune, at Spectacle Solutions
Texas speed engine dyno
GM High Tech
Vengance racing
The intake always makes power, if it doesnt someone isnt doing something correctly. Ive installed a TON of these manifolds on many different vehicles. The reoccuring theme I see with a FAST manifold is that it is even with an OEM intake until 3500, at 3500 it starts quickly gaining power over the stock piece.
The LS3/L92 version is certainly has the least gain over the stock intake, but FAST only claims 14hp & 11lbft. I typically see exactly that! All the other intakes they give a range, but the LS3 version specifically says 14/11. There are no mysteries.
EVERY ported OEM LS3 manifold I have ever seen tested has LOST power. Only the sales pitch dyno graphs ever show a gain.
As far as the edelbrock line of manifolds, I have tested them personally as well. Ive tested the Vic Jr with a 4150 FAST throttle body, and the Pro-Flow XT. Both lost dramatic torque below 5500 RPM. Were talking 40-60lbft which makes the car feel like a turd. After 6500 the Edelbrocks start to pull away from the FAST. On a typical engine (400-525hp) I would see a 10hp gain over the FAST at the very peak of the RPM range. This makes for good bragging right on forum sigs and dyno wars that only look at a single peak number. On Higher RPM engines I have seen edelbrocks make 20hp over a FAST, but only at 7000+ RPM, they still loose 40-60lb ft where you drive 99% of the time.
In the end...... If you drive at all on the street, you want a FAST. If you drage race, only pull of a trailor and drive to the starting line and leave the line at 5500+ then a Edelbrock may be a good fit for you. Its all about combination.
Here are some dyno results of FAST LS3;
100% Stock Pontiac G8, no tune
100% Stock 2010 Camaro, no tune, at Spectacle Solutions
Texas speed engine dyno
GM High Tech
Vengance racing
Last edited by SweetS10V8; 11-09-2011 at 01:41 PM.
11-09-2011, 03:23 PM
#36
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Good info. The small power gains aren't worth the money, if it doesn't carry the power out further then the stock parts. I'm thinking some engines don't breath as well as mine due to the fact mines making peak power at 6000 then stalling and dropping off. The fast might just make more power and help the engine breath at higher rpms. Or not ,and thats all the engine can do. Time for more testing.
I'm with you on the Vic jr it costs to much power down low for a street car. the new Holly looks like it doesn't loose as much torque as the Vic jr. but the test was on a 468 " engine.
I'm with you on the Vic jr it costs to much power down low for a street car. the new Holly looks like it doesn't loose as much torque as the Vic jr. but the test was on a 468 " engine.
11-09-2011, 06:54 PM
#38
Well guys I only bought the intake and put it on the car. So I can only talk from personal experience on a 500 rwhp engine. Im sure stock guys are picking up power all over the place. I was told by a few guys that they had picked up no power after having the intake but hey I watched all of these dyno sheets get posted and saw some gains. I figured I would be happy with a small gain plus it looked cool. Waste of my money on the intake and the dyno time. But feel free to buy it yourself and post the results. I am only trying to help some guys out that are on the fence. But then again I must just have bad data....
Last edited by offaxis; 11-09-2011 at 07:14 PM.
11-09-2011, 08:43 PM
#39
Dont feel bad, most people have bad data. Strapping your car to a chassis dyno, waiting until the coolant temp hits 200 then flooring it is hardly scientific. 
...
I know for a fact that FAST wouldnt release a piece that wasnt proven over and over, to thier satisfaction.
...I know for a fact that FAST wouldnt release a piece that wasnt proven over and over, to thier satisfaction.
11-09-2011, 09:21 PM
#40
Dont feel bad, most people have bad data. Strapping your car to a chassis dyno, waiting until the coolant temp hits 200 then flooring it is hardly scientific. ...
I know for a fact that FAST wouldnt release a piece that wasnt proven over and over, to thier satisfaction.
...I know for a fact that FAST wouldnt release a piece that wasnt proven over and over, to thier satisfaction.
Either way who cares I got most of my money back on that intake and have moved on to way better things
Enjoy