View Poll Results: Single turbo or twin-turbo 383ci?
Single turbo
56
75.68%
twin-turbo
18
24.32%
Voters: 74. You may not vote on this poll
Please recommend turbo for 383ci, 800whp
04-07-2008, 09:34 AM
#1
Please recommend turbo for 383ci, 800whp I am trying to figure out what turbo (or twin turbos) do I need? Please help me decide.
Engine is 383ci, forged, 9.2:1 CR. Patriot stage2 heads.
What turbo (or twin-turbos) should I get for ~800whp?
Car will be daily-driven, but going to track every week. I don't mind sacrificing a bit of driveability to get better top-end. But of course I'd like to get full boost around 4000rpm, otherwise it will be too hard to launch (being M6).
What turbo should I get? Actually I'm sure 2 turbos will spool better (for same max power), but will it cost much more?
I'm driving now Nissan Silvia, 110ci and 8.5:1, car weighing 2900lbs, so I really won't be dissappointed with low-end of 383ci and 9.2:1
Also, another big question - should I be happy with truck manifolds, or stretch my budget and get better headers? I know I can get 800whp with truck manifolds, but don't they impede flow too much, raising backpressure and EGT too much?
Engine is 383ci, forged, 9.2:1 CR. Patriot stage2 heads.
What turbo (or twin-turbos) should I get for ~800whp?
Car will be daily-driven, but going to track every week. I don't mind sacrificing a bit of driveability to get better top-end. But of course I'd like to get full boost around 4000rpm, otherwise it will be too hard to launch (being M6).
What turbo should I get? Actually I'm sure 2 turbos will spool better (for same max power), but will it cost much more?
I'm driving now Nissan Silvia, 110ci and 8.5:1, car weighing 2900lbs, so I really won't be dissappointed with low-end of 383ci and 9.2:1
Also, another big question - should I be happy with truck manifolds, or stretch my budget and get better headers? I know I can get 800whp with truck manifolds, but don't they impede flow too much, raising backpressure and EGT too much?
04-07-2008, 09:42 AM
#3
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04-07-2008, 05:33 PM
#10
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NO! with that much HP you would be risking boost creep, bleed valves (internal "waste gates") cant flow enough air to controll that amount of power... you can skimp on the turbo.. but cheaping out on a wastegate will kill your engine.
whats the most a 67 wil support, 600 but you are generating alot of heat... you cant just spec a turbo by quoting inducer diameters.. you need to have some put together to your specs... you can buy a masterpower t70 for less that 600 bucks, and it will flow upwards of 800-850 Hp... AND you can get it in the inducer/exducer trim, inducer and exducer diameter and inducer and exducer .A/R you want.. if you dont know what these terms are... dont even think about specing your own turbos.. just build your engine.. cam, displacement, headflow, rpm and order turbos for it...
whats the most a 67 wil support, 600 but you are generating alot of heat... you cant just spec a turbo by quoting inducer diameters.. you need to have some put together to your specs... you can buy a masterpower t70 for less that 600 bucks, and it will flow upwards of 800-850 Hp... AND you can get it in the inducer/exducer trim, inducer and exducer diameter and inducer and exducer .A/R you want.. if you dont know what these terms are... dont even think about specing your own turbos.. just build your engine.. cam, displacement, headflow, rpm and order turbos for it...
04-08-2008, 11:13 AM
#12
single would be your cheapest and simplest route to 800rw
you could even do a nice 76mm with a big hot side and squeeze 800rw out with that compression
if you do like 100% of the rest of us though, you will want more and for that reason i say start off now with a pte-88
you could even do a nice 76mm with a big hot side and squeeze 800rw out with that compression
if you do like 100% of the rest of us though, you will want more and for that reason i say start off now with a pte-88
04-08-2008, 01:59 PM
#13
yes I'm power-addicted like all of you, that's why I'm going from 1.8 to 6.3 liters in the first place
But from what I have read about LS1, 800whp would be limit for such engine? I really don't want to blow up the engine, it's impossible to rebuild it here.
What's the cost and power limit of 80mm?
Also, won't be 2 smaller turbos with intern. wastegates approximately they same price as 1 big turbo?
But from what I have read about LS1, 800whp would be limit for such engine? I really don't want to blow up the engine, it's impossible to rebuild it here.
What's the cost and power limit of 80mm?
Also, won't be 2 smaller turbos with intern. wastegates approximately they same price as 1 big turbo?
04-08-2008, 02:08 PM
#15
Not here... engine building is not developed here it all. That's why I ordered the car from states that already had built low-comp engine. So I have to stay within this engine sensible limits...
What do you think of two internally-wastegated turbos for 800whp? are there any for a reasonable price?
What do you think of two internally-wastegated turbos for 800whp? are there any for a reasonable price?
04-08-2008, 07:05 PM
#19
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This is a good place to start when learning about turbos.
http://www.turbobygarrett.com/turbob...ch_center.html
That and the stickies.
My recommendation for your build would be a single 80 with an external wastegate. You could run a 76 but you'd be pushing past its' efficiency when you get closer to 800+ HP.
http://www.turbobygarrett.com/turbob...ch_center.html
That and the stickies.
My recommendation for your build would be a single 80 with an external wastegate. You could run a 76 but you'd be pushing past its' efficiency when you get closer to 800+ HP.
