Twin 67's..too small?
 

A year ago, I would have never been asking this but,...after seeing these other standing mile builds going off,...i'm feeling like I may be putting this together,..only to POSSIBLY be dissapointed. With twin 82's here, twin 76's there, twin 72's,..it's crazy,..am I underachieving before I begin? Originally I planned for 1100-1200rwhp and hoping for 220mph+

The setup-
364ci LS2, diamond pistons, eagle rods, stock crank(i know)
TEA trick flow 235's with 700 lift springs, bronze guides, seats/inconel valves and stainless exhaust
Virginia speed cam,..stage III/etc
PROBABLY a fast 102 but I may end up using a wilson sheetmetal borrowed from my cousin...
90mm TB
Air to air intercooler,...which stays very very very cool.


and heres the guts,..Pro turbo kit, T4 flange, 4" inlet, 3" outlet twin 67mm precision turbos, coated black on compressor and exhaust housings, dual 3" downpipes, into 3" dumps, no mufflers, will eventually have tailpipes, no mufflers. I plan to run up to or around 6800RPMs, and I have plenty of fuel(which is E85).

For comparrison sakes, it made 787rwhp(5500rpm) on a 346ci stock motor with a 230's cam and AFR 205s on pump 93, 11.5psi and 12 degrees of timing, so I know it is more then efficent. I was just mindfucking myself when I read all these posts of builds,...so I called my turbo company today, and they told me they can either USE my exhaust housings only, which I thik is a 69mm, and they can change the compressor housing and wheel to a 72mm,....or, they said they'd give me two complete 72 mm turbos,...for little if anything. So,... Do I NEED these upgrades? Gay question I know but, my MAIN concern is will it clear the stock hood,... and how much am I LACKING or NOT by making the chagne, or not.


heres and old graph of the old motor, same turbo kit(67's)..maybe one of you guru's can tell me if it would be a stupid move or not. I just have been building it now for over a year,...I can have the turbos off QUICK but,..i'd rather just put them on(67's or 72's), and be done with the guess work for a while. Has anyone seen any 70+mm turbos on a proturbo kit'd vette? I'd go out to look on my car right now but I keep it two hours north of here.

Again, looking for an effiecent 1100+rwhp, in a somewhat useable fashion. It's geared to go 250+ on a track longer then a mile.
http://i70.photobucket.com/albums/i8...e_tt_boost.jpg


Thanks for any input. They're dropping off a 72mm turbo to me tomorrow at work so I can check it out. I appreciate any advice or input from you dudes. Thank you again in advance.

Jamie

67s will make 1200 rwhp no problem that would be my choice for that goal.

i highly doubt that a stock crank will hold up for a mile at that power level.
looks alot like a timebomb.

Uggh, you had to mention that stock crank, huh? LOL.

My vote is to let the 67s eat and see where we end up ;)

other then your opinion on the crankshaft, which I'm aware of the possabilities,...what's your opinion on the turbo question?

just had one dropped off,...the housing is pretty ugly looking,...doesn't have surge ports, gotta get specs.

sticking with turbos, shooting for 1xxx whatever.

thanks-

Run your 67s for your power level and engine size.