Hellion

I recently installed LS6 heads onto my car and was really wanting to be at least at the 420 RWHP range and maybe somewhere between 390-400 RWTQ. My dyno results were 408 RWHP and 384 RWTQ. What all mods would you recommend so that I could hit about 440 RWHP and about 400 RWTQ? I believe that the 2.5" FLP Y-pipe is restricting the Tq. a bit... I also think that an ASP pulley, TB, Tunning and dual cutouts would help. Any help, insight would be greatly appreciated. My cam is a C2 224/224 .581/.581 on a 112 LSA, the heads are MTI S2 LS6 heads I'm starting to think that a bigger cam is in order

Thanks
Nathan

Bill00Formula

iTrader: (4)

I would have thought you'd be a bit higher too. I have a similar package on a 00 formula. It has all the bolt ons (including ported throttle body & UD pulley) C1 cam and MTI LS6 stage II heads (no milling) and dynoed 423 rwhp and 400 rwtq. At the time I had the stock rearend and stock gears. I guess those part differences would explain the difference in hp. It is one of the stronger running NA cars in the area.

JoSeY

stage 2 mti heads, x1 cam, full bolt ons 420rwhp +...the cam is killin you.

LEO

iTrader: (3)

There has been a car with a C2 cam that has hit 440 rwhp at MTI and many others that have done 425+ rwhp, so it's not your cam. Lokk to your own suggestions to elevate your hp levels. Tuning from MTI is usually worth 10-15 rwhp. I picked up 9 rwhp with the ASP pulley and I also picked up 8 rwhp with a MTI throttle body. I believe if you do those 3 things you should attain at least 425 rwhp.

VINCE

iTrader: (1)

Take it to the track.. Do not always rely on dyno #'s..

Jason99T/A

iTrader: (21)

Your numbers are not bad at all! We those few mods you listed, 425rwhp should not be a problem. RWTQ should jump to right around 400 as well.

Jason

DRK-SYD

Add a LS6 intake, Pulley and tuning..I had 431/400 to the wheels with stage 2 Ls1 MTI heads. I too had the C2 cam!

late

bodhi

Hi Nine Ball!!

I think with tuning and the other bolt-ons, you'll be at or above what you wanted.(remember- you also have 12 bolt w/ 4.10's- that's about 10-15 rwhp off your dyno.) I would definitely consider a larger cam though. Those heads should carry just about any cam you want, PVC and rpm being the limiting factor. I know (you know who- 9 ball) shaves their LS1 s2 heads .030" unless otherwise told, but I don't know about the LS6 heads.

99 Black Bird T/A

iTrader: (4)

I think there is more to be found, the TB, pulley & cutout should free up some hp.

Clutch holding nice and tight?

Z-Rated

Marc he has an LS6 intake because its a 2001 :p

John B

iTrader: (10)

Getting rid of your restrictive exhaust system by upgrading to at least 3" tru duals with an "X" pipe or a 4" mufflex combined with the pulley & a ported TB should net you right here you want to be very easily along with proper A/F tuning.

Look at my MTI numbers through full free flowing exhaust with LS1 S2 heads & their smallest cam, the B1!

Hybrid Slow

The mods you have planned (ASP pulley, TB, Tunning and dual cutouts) should get you to 420rwhp. You'll need a different cam to hit 440rwhp, like others have said.

BIGBOS

I made 370rwhp and 455rwtq, with the LS1 S2 MTI heads, .30" milled....with an X1 cam...

Through A TH400, non locking converter...

Hellion

Thanks everyone

Yeah the clutch is still holding up for now

John B: Hey what's going on Do you think that if I put dual cutouts right after the headers that the exhaust would perform just as well as a 4" system? Does mufflex make a 4" Y-pipe and I-pipe? Nice hearing from you. I might even make it to the track one of these days soon. I've just been really busy finishing school and working.

Nathan

gomer

iTrader: (13)

Those are pretty close to the same numbers I made with my TR220. I'm sure that 12 bolt is taking alot from your dyno numbers, but will more than make up for it at the track.

CRAGER

Jayson at MTI tuned my car and with my little T1 cam I made 424rwhp and 407rwtq through my Moser 12-Bolt w/4.10 and through my Loudmouth with a Borla XR-1 muffler.
Mike at MTI built me a 3" y-pipe and I know it helped some, don't know how much. But it's cool how he made it because it still connects to my FLP's with the "V" band clamp.
I also have a MTI ported and polished TB and ASP pulley. I think the C2 cam you have is badass, I would try the 3" y-pipe, TB, pulley and then some tuning to reach you goals.




Craig

absolute speed

Nathan--- I recently had a chance to flow a set of mti stg2 ls6 heads. They flowed exactly the same on my bench as they post in the graph on there web site. They are a great set of heads and I give mti credit and respect for advertising the exact flows on the heads and not exaggerating flows like alot of other brand heads I have tested. I feel your problem is cam selection, while the pully and ported TB will add some more, a properly matched cam will do wonders with these heads. I suggest you contact mti and get there recomendation on the proper cam for the heads. good luck

LawmanSS

iTrader: (19)

Nathan---I just received my MTI stgII LS6 heads the other day...when I ordered them, they recommended the X1 cam for these heads. Wayne, the sales manager, said that he had this combo on his car and dynoed 443rwhp. With the heads milled, P/V becomes an issue. Although the X1 has .591 on the intake, Jayson stated in an email to me that there would be no problems as long as you don't rev past 6600 rpm,FWIW.

Bohdi--MTI also mills the LS6 heads .030 unless told otherwise.

John B

iTrader: (10)

Cutout's should work but I personally prefer a fully engineered exhaust system. Try Mufflex's web site for info on their Y-pipes (if they have any).

mike c.

iTrader: (1)

i would of thought ls6 heads and c2 cam would of done more. i have a cheep set of r.g.r st2 heads($1,400),c1 cam,mac's w/off roads,pulley,12bolt and did 424.1hp & 407.4tq. at this dyno i did'nt have a ported mass,th-body and no cutout either.with the rest of the boltons i should be 440-445hp. i think too many people get cought up in the BIG name companies. i'm not bashing you,like you i would of thought you would have more too.