johnny89345

iTrader: (1)

99 camaro m6 stock 10 bolt 411 gears

tsp 408
prc 247 heads
ms4 cam
fast 92/92
42 lb racetronix injectors. racetronix hotwire/fuel pump kit
arh 1 7/8 longtube headers no cats flowmaster cat back
only put down 478 rwhp and 460 rwtq
what coud be liniting these numbers? and what do you guys suggest i do next?

Hamrdown

iTrader: (25)

Is the flowmaster catback part of a mufflex system or is it the Flowmaster catback set up? I'd wager that's where your leaving some power on the table. True duals with an x or h pipe will be considerably better over a flowmaster catback! If its the Muffelx system then you may need to upgrade to the 4" set up to get the gains you want if you wish to stay with a Y pipe. If it is just the Flowmaster catback I'll be honest, although it sounds good, some have actually lost HP over a stock set up but most just see a zero gain.

lemons12

iTrader: (71)

Fix the exhaust... At least at a cut out..

Compression?

johnny89345

iTrader: (1)

Its an old *** flowmaster that came with the car. Not mufflex. I kinda figured this was holding me back. With this motor the rasp starts before I even hit 2k rpm. I have been looking into kooks true dual setup as I daily drive this car lol. What do you think on their 3.5 inch system?

johnny89345

iTrader: (1)

I don't remember the exact compression. I believe it was 11.2:1

Hamrdown

iTrader: (25)

Oh man! Yeah...change that thing out! You'll be where you need to be once that's done.

toby

iTrader: (1)

Change the cam after you change the exhaust.

Brennen's01SS

iTrader: (1)

Remove the chokemaster and gain 30 rwhp
Or run 3" duals and gain 40+ rwhp. A custom cam would also help. What kind of vacuum (kpa)is the motor pulling at wot. Any restrictions in intake (small maf or small coupler)?

johnny89345

iTrader: (1)

Yes fast 92/92 unproted to stock acordian coupler to stock maf..okay now If I went with kooks shouldbi buy their 2 inch headers and 3.5 inch true dual or is my 1 7/8 enough

johnny89345

iTrader: (1)

Ill also test the vacume tonight somehow gotta go get a guage somewhere

Hamrdown

iTrader: (25)

1-7/8" headers are plenty unless its forced induction. 3-1/2" true duals are going to be a bit too big. You'll lose some of that torque. Stick to 3" duals and you'll be just fine. I'd wager that you'd be at 500+ rwhp with just an exhaust swap.

johnny89345

iTrader: (1)

To run their duals I'm going to also have to buy their headers. They sell 1 7/8 headers that go with their 3 inch true dual and 2 inch headers that go with their 3.5 inch system. So I really don't wanna regret spending all that cash if I def won't need the bigger ones.

Brennen's01SS

iTrader: (1)

Use a programmer or scanner on your OBD2 port to read the map sensor. You want to be as close 100kpa as possible

Hamrdown

iTrader: (25)

You definitely don't need that size for your application. Get the 1-7/8 headers & 3" true dual system.

johnny89345

iTrader: (1)

What else do you guys think I should get besides the full exhaust. I was thinking a ported fast 102/102, tsp 100mm maf, ftp 104mm lid, and a ati 10% ud balancer. How's that sound and then later on ill figure out the cam situation once all the supporting mods are there

Pray

iTrader: (7)

Go with the plan in the above post and the headers with true duals. I think the heads are at least 10cc to large if not 20. That is hurting you. For heads that big you will need a cam in the high 240's to high 250's minimum to take advantage on a 408. You will also have to mill them pretty well to get the 12.0+ compression you are going to need to run that cam. A ported 92 will take you to 575+rw. It was proven on my 416. But the 102/100 won't hurt. I would ditch the MAF and so CLSD or COSIII but that is just me. MAF's have come a long way and may not be a restriction any more if you size it correctly. Don't be dissapointed in your numbers now. It just looks like a bad set up honestly. ARH and Kooks headers are almost carbon copies. Are you shure Kooks true duals won't bolt up?

redtan

iTrader: (5)

Definitely gong to need better than the stock MAF and lid on that engine.

You might not need the FAST 102, but a 4" MAF and 4" lid would help you tremendously.

johnny89345

iTrader: (1)

Positive theirs a difference in lengths and the only exhaust shop near me is arh so I don't think they'd be happy if I asked them to fab something up between their headers and kooks true duals. Also remember this is my daily driver not a race car, tsp told me this is the highest conpression I can run on 93 octane.

slow trap

iTrader: (22)

a single 3" can flow alot more air than people think. i did the stock maf/7x mm lid to 85mm maf/98 mm lid and picked up quite a bit of power. since it is a dd i would just get a better flowing muffler and bigger maf,lid and coupler and a cutout and get a retune. with just those changes you should be an easy 505-510 throuh the exhaust and pick up another 15 or so with the cutout open.
my junk setup is similar to yours. i have a 90/90 that i just got rid of the ridges on the inside of intake and blended smooth. only 1 3/4 qtp headers also. 517 rwhp through a hooker catback. 536 with the single 3" cutout open. and that is through a 9 " 3.89 combo.

AmDWs6

i would have defiantly gone with 102/102 fast's Tsp 100mm maf, 104ftp.

and stick with the 1 7/8 although your system is just a kill.

y-pipe, anything else than a chokemaster as Brennen's01SS said. (that really made me lol).

perhaps some stated that your heads are larger.. i'd look into that once i'm done with the above .. still not satisfied well then cam swap time.

gl