Im looking to Put a new cam in my fully stock GTO, not sure which would be a good size. I plan on getting Headers intake and anything else ill need including the valve train beef up and pushrods. anybody have some cam size recommendations that won't cause a rough idle now with my stock set up. but will allow for possibly around 500 hp for future upgrades? any thoughts is help enough.

 

Need more info on what ur plans are and if M6 or A4 !

 

Its an M6, well in time ill do an underdrive pulley, full exhaust and headers, the cam, pushrods, better valve springs to compensate for the lift of the cam. possibly heads if the stock gto heads are a weak point in the car. if not i might just get them milled or leave them stock. a new clutch. thats really all i can think of. i just want a cam that isn't going to kill my low end torque. but i don't wanna get a cam thats so small i end up replacing it again. unless thats something that i have to do. id like to get 550 RWHP in the end. small budget currently just bought the car so all my money went to a down payment. got a few thousand to play with right now. don't really wanna blow it all at once. i have the heads off now, waiting till tomorrow to send them out after i blew my head gasket. so while they are at the machine shop fo 2 weeks i figured i could cam it.

 

550rwhp?

Good luck!

 

NA 550rwhp + good idle = Built 427 or 440 LS7 with exhaust, clutch, and a couple of other goodies (expensive very expensive).
Boosted 550rwhp + good idle = ATI pro charger + blower cam (and upgraded valve-train) + headers. (still expensive).

If you have around 5 to 6K to spend just on parts then go with the following.
Trickflow 550 LS2 kit - cnc 225 heads, Harland Sharp rockers, Trickflow 238/242 cam, head & exhaust gaskets, along with head bolts (and crank bolt).
1 3/4" or 1 7/8" Long tube headers
Ported and polished Fast 92 (if possible port matched to the heads).
Larger injectors (39lb to 45lb ev6 units)
Vararam CAI
new clutch
Retune
Note: this do not include installation...

That should get you somewhere around 465 SAE adjusted rwhp on a Dynojet dyno (plus or minus 20hp for altitude and fuel available).

On average the M6 GTO's have around a 15 to 18% parasitic loss from the drive train.

Simply put: a/b=x/100
a=rwhp b=bhp x=whats left after parasitic loss.

Examples:
550rwhp to unknown crank hp (x) with 15% parasitic loss from the drive train.
100-15=85 (85% is the amount left after parasitic loss)
Hard Math: 550/x = 85/100 (cross multiply top left to bottom right and top right to bottom left) <--> 85x=55000 <--> 85x/85=55000/85 (x=55000/85) <--> x=647
So 647bhp for a 550rwhp vehicle with a 15% drive-train loss.

Quick method: Divide the 550rwhp by .85 (comes from the 15% drive-train loss) and you end up with 647bhp.

Another example would be 550rwhp with a 18% parasitic loss drive-train (82% gets to the ground) would put the motor at 670bhp (550/.82).

And 500rwhp @ 15% parasitic loss is 588bhp (500/.85).

Oh and you can estimate the rwhp if you know the drive train loss and the base hp.

Say you have a 18% drive-train loss (82% gets to the ground) and a engine dyno that puts the motor at 500bhp.
Rough est is 500*.82 (x/500=82/100) or roughly 410rwhp.
Note: This will drop if the intake flow, exhaust flow and computer tune on the vehicle are not up to par with the engine dyno's test.

You can also figure out the drive-train loss if you know the bhp and the rwhp.

Example: Take my first dyno run when my 05 GTO was bone stock. It put down 340rwhp and the car should have been 400bhp.
hard math: 340/400=x/100 <--> 400x=34000 or x=34000/400 so x=85 and 100-85=15
So my drive line eats up roughly 15% of my engines power.

Now I can combine information with my last dyno run which was 409rwhp sae adjusted. @ 15% drive-train loss that puts the car at around 481bhp.
End Examples... end rant, I didn't get enough sleep yesterday... I need to get a life... good night.

 

A stock 05-06 GTO ...What's the stock time on the car in a 1/4 ?

 

thanks bring the noise. maybe i was aiming a little to high. i have intention of puting some form of forced induction in the car in the end. for now i just wanna do bolt ons cam and new valve train upgrades. my main goal is to just get the car running best as possible with just a cam. on an affordable standpoint. ill just need to read up a little more and figure out what i want. not trying to break the bank as of now. but i can do all this work myself. so ill save on labor.

 

I have a moderate cam from sale out of a customers GTO made 404whp through auto pm if you want details

 

Do you mean 500 flywheel horsepower as in STOCK had 400 hp and you want 500hp? Or do you mean 500 rearwheel horse power? If you want 500 flywheel then you will need ,VARARAM CAI, LT headers ,catback, U/D pulley,Ported intake/TB or a PORTED FAST intake would be better,better valve springs,hardened pushrods as supporting MODS. As for the cam that is very driveable that will give a little lope but is still smooth idling but still meet your power goal of 500hp= (440-445 rwhp as most on this board will measure) I would say something in the range of COMPs.588-.595 lift 228-232 dur 114 LS should get you there. Most will say go bigger but I think that would match your stock heads perfectly.

If you want 500 rear wheel HP and a smooth idle you better get a SUPERCHARGER or a 402-427 Stroker.

Oh I just read that you want 550rwhp, you need all of the above (supporting mods)and a SUPERCHARGER ! That cam will work well with a S/C in the future tho!

 

http://www.ls1gto.com/forums/showthr...44#post3463344

All you need to know about LS2s in the 1/4.


OP:

If you want a daily driver that is good for 500rwhp with stock like idle and driveability. Just buy some headers and a TVS1900.

If you want a cam, contact Ed@ FlowtechInduction.com and ask him for his advice.

 

Hell yea bro thanx alot that just might be my next car.

 

What's the ls2 stock cam spec's?

 

Ive got the TSP228R cam and its awesome.... I make 405/389 in my 04 and thats with the garbage 241 heads.... Im still running the stock LS6 intake as well.... Very strong cam, I highly recomend it....

 

204/211 .525 .525 @ .050 116 lsa i believe....