TurboAv

iTrader: (6)

Car is a 2005 GTO, full weight. My goal is 800rwhp through a TH400. It's going to more of a fast street car/ occasional racer. Not an all out race build. Engine is a 370 LS motor with 9.25:1 compression, ported 243 heads, and a 243/247 .624/.624 on a 116 cam. TH400 w/ a 4200rpm stall, 3.46 gears, and 26" tires(I can fit 28" if I want).
I was originally going to do a front mount single turbo w/ C6 manifolds, but now I'm second guessing myself. I like the simplicity of just bolting on a blower without having to pay for fab work and working kinks out. Just wanted to hear some opinions from you all.

98Z28CobraKiller

iTrader: (17)

I couldn't live with all that noise under the hood. Your street car will sound like a race car all the time. Absolutely zero stealth factor.

TurboAv

iTrader: (6)

Not worried about noise, lol. I like loud and obnoxious. My wife was actually pissed when I told her a turbo setup would quiet the car down. She liked the old nasty NA cam and the loud exhaust. She was also pissed at me for putting in a TH400 after blowing up the 6-speed. She hates automatics. Her Duramax is a 6-speed manual and she is bent Chevy quit offering manuals.

spaz1

iTrader: (9)

I would go turbo, I couldn't handle the racket in a street car..

khenry

iTrader: (3)

I've decided to go single turbo after the same debate with myself. I'm getting a 370 built now and turbo later when the funds get built back up.

HUNTER02SS

iTrader: (24)

You will be able to reach your goal a little easier with a turbo setup rather than a Blower setup. Both will get the job done however.

TurboAv

iTrader: (6)

I've got some pics from Perdieu's build, so when I show the shop what his looks like maybe I can get a ballpark estimate on fab cost for a single. Who knows, maybe I can use two C6 manifolds and just tie them together with a single. Be easier to tell once I get the motor back in the car.

airforcemanss

iTrader: (23)

too big of a cam for either direction. for a fun street car i chose procharger but you have a 3speed so i would go turbo

TurboAv

iTrader: (6)

That's the cam my engine builder came up with along with his engineer buddy at Comp Cams for a turbo build. Showed up way bigger than I thought was necessary as well, but I'll give it a shot.

bad6as

iTrader: (17)

800 to the wheel in a th400 with a 4200 rpm stall is alot of power. dont aim for a rwhp number, set a goal with et or trap speed

TurboAv

iTrader: (6)

That is one big thing going for the turbo setup. Easy to adjust boost down for the street. I want to be mid to high 9's in a full weight GTO when set on kill. I will most likely run the local 10.0 index class because I don't have enough money to hang with the Outlaw boys. I also just found out that somebody is selling their single T76 kit off their GTO to switch to a Procharger, so depending on the price I may pick that up.

ohshixgoat

iTrader: (14)

you will need more cubes to take advantage of a f1c setup, my buddie just changed his blower to a f1-a (383 ls1) bob told him that they have better results in lower rpms

TurboAv

iTrader: (6)

So he went from a F-1C to a F-1A? I'm running a 4200rpm stall. I was hoping I could take advantage of the extra airflow I could get out of the F-1C.

ohshixgoat

iTrader: (14)

he went from the f1c to the f1a. bob told him that the f1c takes more power up top but for a primarily street car the f1a would be a better fitfor the street. imo your setup would be better with a nice t-76 or maybe bigger. with your stall converter it would be spooled up and ready to go right off the line..

TurboAv

iTrader: (6)

Hmm. Good info. Thanks.

I was thinking of the T78 from Turbonetics, the next bigger compressor housing over the TC78.

6techniques

iTrader: (7)

you seem to lean towards a turbo more so...go turbo!

bad6as

iTrader: (17)

you need more then a tc78....what would be your race weight?

TurboAv

iTrader: (6)

Not the TC with the small compressor housing. The "T" with the next larger compressor housing. Raceweight would be about 4300#. I was also eyeballing the Precision 80GTS.

bad6as

iTrader: (17)

to go 9.7 at 4300 lbs you need about 940 flywheel hp

TurboAv

iTrader: (6)

My goal is 1000 at the crank on kill and dial it back a little to run the 10.0 class.