my goals are ~7-800hp

my motor setup:
408 cu in
10.0-1 compression
cam specs are : 246/250 (@ .500 lift) .630/.630 actual lift
ported l92 heads
96lb in jectors with E85
tuning using HPtuners

turbo kit:
6.0l truck headers with a 3.5 DP or as big as i can fit through the engine bay, then into a 4.0 exhaust
im open to suggestions on crossover pipe size (2.5? 2.75? 3.0?)
all of this in a nissan 240sx.

i live in colorado (6200 ft) so i have to spin the turbos alittle higher then the sea level guys (to make up for altitude), which will create more back pressure.
i was thinkin a tc-78, but from some searches i have see on here alot of people are saying thats to small for a 408.

the car is mainly a street car.
it will be drag raced 5-6 a year (unless they boot me off the track),
also drifted 4-5 times a year, so i want something that has a big powerband.

im open to a twin setup or a single setup as long it matches my requirements.
twin 60mms? single 76mm? maybe a 80mm?
what size crossover would be best for my setup?

thanks in advance for your help

 

408 needs an 85-88mm especially at 6200 ft to make good power without having to spin the turbo HARD.

 

you think an 80mm is to small?
what kinda of a spool up time am i looking at with a 85mm :o
i know there is alot of different factors, but whats a guesstimate to ~12psi


also what a/r turbine should i be looking at?

 

1.32 and you will come into boost plenty fast.

 

Yeah a 1.10 to 1.32A/R will work. Also an 80 can get you there, but leaves you less room later down the road especially at that altitude. 6200 is some thin air bro......with a 408 you need a big huffer to fill that motor....hehe

 

bump for more opinions.

 

DrTurbo and Hellbents are probably the best two opinions you could ask for. That 408 should have no trouble spinning up one of the turbos they've recommended.

Patrick

 

i understand the 2 the already responded know there stuff, but it doesnt hurt to hear different opinions from others (especially from people that arent selling the products im buying)
*im not implying anything, just looking for other opinions

 

I'd look hard at the 60lb/hr APS twin kit for drifting, drag and street. I ran a twin GT35R kit that also flowed 60lb each and the spool was terrific. Enough power for 9.2 at 146mph at 3850lbs and 4000ft DA. Cast iron manifolds are nice for what you want.

 

^^^ i was thinking twin 60mm's , im just alittle unsure on the amount of room ill have.
thos time are faster then i want to go, i only want to put a roll bar, not a cage in it.

id be happy with 10.01 @ 135

 

any input on what size i should go if i end up going twins?

 

IN a 240sx?!?! That thing is gonna be wicked...good luck. Staying tuned for times!

 

Twin FI62's.....72lbs/min

 

haha, yeah, the car weighs ~2950 with a full tank of gas.

 

how are you not making more power with that much lift kelly? or is the plan for a new top end thats not on it right now

 

the heads arent that great on it currently, but they have to be on there because of the pistons that are in it (long story, i can explain it better in person)
also i posted uncorrected numbers. (unless your talking about the CRN dyno sheet)

im open to suggestions trent, we both know the world i came from, (honda world)