high altitude turbo suggestions
07-20-2008, 12:52 PM
#1
Staging Lane
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high altitude turbo suggestions 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
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
to make good power without having to spin the turbo HARD.
07-20-2008, 02:18 PM
#3
Staging Lane
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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?
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?
07-20-2008, 06:33 PM
#5
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
07-22-2008, 05:51 PM
#7
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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
That 408 should have no trouble spinning up one of the turbos they've recommended.Patrick
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07-22-2008, 08:26 PM
#8
Staging Lane
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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
*im not implying anything, just looking for other opinions
07-22-2008, 09:44 PM
#9
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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.
07-23-2008, 02:53 PM
#10
Staging Lane
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^^^ 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
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
08-07-2008, 02:54 PM
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08-11-2008, 01:43 PM
#16
Staging Lane
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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)
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)
