Patrick G

iTrader: (14)

There has been so much speculation as to whether the FAST 102 would gain any power over a ported LS3 intake on a 6.0-6.2L engine with a stock long block, I decided to conduct my own scientific test. By scientific, I mean that only the manifold gains or losses alone would be shown.

We started off with a 2009 Pontiac G8 with a 6.0L L76 engine with AFM/DOD, stock 90mm throttle body, American Racing 1 7/8" headers with dual cats, Vararam Cold Air Intake, ASP UD pulley, Yella Terra 1.85 rockers, and Comp 26918 beehive valve springs (so we could have better valve control above 6000 rpm). Stock cam, stock torque converter. All runs were same day, same dyno. The manifold swap was performed on the dyno.

The red run featured a Stage 2 ported LS3 intake manifold by an LS1Tech sponsor. This combo was super-tuned for best overall power. The blue run is with the FAST 102. It too was super-tuned. As you can see, even with the mildest of engines available with an L92/LS3 head, the FAST 102 intake manifold gains nicely over the most expertly ported factory intake. If you were to add significant airflow from a camshaft or increase cubes, the gains would only be larger. Remember, this is the smallest, mildest motor that come with rectangular port heads.

For those who can't read the dyno sheet, the ported intake made 389.3rwhp/387.6rwtq. The FAST 102 made 393.7rwhp/390.6rwtq. Although the peak gains were only 4.4/4.0, the gains at other rpm were much higher.

fastvet

iTrader: (2)

So the fast wasnt Ported at all??

venom ws7

iTrader: (13)

Thanks a lot for the comparison Patrick.

IMO those are very nice since you started with stg 2 ported stock intake.
I think you can get close 15rwhp if the stock intake wasnt ported what do you think??

I still can't believe some pepole didnt gain and some lost some power from 102Intake over stock LS3 intake.

Oh nice numbers from the car BTW.

69LT1Bird

iTrader: (1)

Thanks for doing these tests.

I know it was a week ago and the weather or whatever may be different but, you have no real gain from the thread about the header install.
https://ls1tech.com/forums/dynamomet...p-388rwtq.html

Not criticizing, just curious.

Patrick G

iTrader: (14)

Yes, different day, different weather, but same dyno. But even with that, here's the overlay of the stock intake vs the FAST 102. FAST intake is in red. Stock intake is in blue. The FAST just walks away from the stock intake at higher revs and this is with the wimpy stock AFM camshaft. The gains are over 20rwhp at 6200 rpm.

redsilv

so much thanks for your posts patrick g
always informative to help me decide my 6.0 build

allngn_c5

iTrader: (3)

+1, Was the fast ported ?

Nice honest a-b comparison.

Patrick G

iTrader: (14)

FAST 102 intake was completely unported and bone stock.

JakeFusion

iTrader: (7)

I think if you went to a 102mm TB, it would show more power too. Nice comparison.

ScreaminRedZ

iTrader: (3)

Very nice comparison. It's too bad the baseline was lower as I was curious to see how the ported stock intake did against the unported stocker.

Patrick G

iTrader: (14)

Here's the overlay of the ported intake #2 vs an unported stocker. Although the ported intake carried the power better at higher rpm than stock, it did not make better peak power. This is the dicey thing about buying a hand ported anything. Some times you get a winner, some times you don't. Basically, I had one bad ported intake and one so-so ported intake. Without having the dyno as a reference, I would have never known that they lost power in certain places.

Blue graph is stock intake manifold.
Red graph is Stage 2 ported intake manifold.
Both were tuned for max power.

Marc 85Z28

iTrader: (8)

I didn't know the G8 came with a Top Fuel engine option.

ScreaminRedZ

iTrader: (3)

Thanks for the info! That's the reason I want an untouched FAST when I get one rather thatn a ported one...you never really know who did the port work when you buy parts used.

zigroid

iTrader: (22)

what specs are on the G8 GT cam that its so wimpy? I know I read in another one of your threads the cam is very low lift.

Patrick G

iTrader: (14)

It's something around 200/208 .479/.474" 116LSA. Pretty wimpy cam to make darn near 400 to the tires through an automatic transmission.

allngn_c5

iTrader: (3)

Any thoughts on pulling that Manifold and porting it then strapping her back to the dyno ?

Great work as always !!

zigroid

iTrader: (22)

its just so unbelievably impressive how a cam that size in a 6L engine can produce about 450 hp. I got a stock LS2 cam laying around, almost makes me want to skip the $1000 or so I'd spend on a new cam/valvetrain for my 6.0L LQ9 bottom end / LS3 top end build knowing I could probably get 400 rwhp out of it with bone stock driveability for so little money invested.

RickClarke23

iTrader: (4)

Well that really helps my decision Patrick to go ahead and plan on buying the fast for my combo in april. Maybe we could do a comparison on my ported LS3 to a fast in my car with your custom grind cam and a set of Richards WCCH stg 2 ported ls3's. We could do an N/A and Nitrous compare

LS1 SPEED

iTrader: (22)

Patrick

nice results and thanks for sharing

billy.johnson

iTrader: (5)

great work but is less then 5 hp worth the money?? I could find somewhere else to use the money for more horse power...