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Old 03-28-2012, 01:50 PM   #1
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Default Find me a turbo that fits these critera

I am terrible at mapping out stuff on turbo compressor maps.

Basically, I am looking for a turbo that is extremely quick spooling to make 10PSI (ish) as fast as possible at 2-3k RPM and is efficient while doing sowhile ALSO being able to flow an easy 5-6PSI at 7.5kRPM. The PSI it would be pushing out of the compressor would be a linear down curve starting at about 10PSI at 2-3k RPM to approx 5-6PSI at 7500RPM.

Large external wastegate will be involved so turbine housing choke is not a big deal since a huge majority of exhaust gases will be bypassed at high RPM. So a small quick spooling turbine housing is a must.

Pls and thanks.

(if you think there is a tuburbo that has an internal gate (ported gate obviously) that would also meet this criteria I would be open to it.

So far I'm thinking a GT2550R meets this after briefly looking at the compressor map. But which turbine housing would be best?

Am I right in thinking that if it is efficient in flowing 10PSI by 2-3k that it will have no problem with the 5-6psi at high RPM? I'm guessing here that the high rpms stuff doesn't really matter?
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Old 03-28-2012, 01:51 PM   #2
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so basically you want this in red?

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Old 03-28-2012, 01:58 PM   #3
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More or less. What turbo is that?
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Old 03-28-2012, 01:58 PM   #4
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a t25 off an SR20, thats running around 9.5psi to redline.


basically a GT2554.
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Old 03-28-2012, 01:59 PM   #5
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Yeah that's what I meant to say in my original post... 2554R. But those aren't available in v-band are they?
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Old 03-28-2012, 02:25 PM   #6
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Old 03-28-2012, 03:52 PM   #7
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Quote:
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A GT2554 with a .86 turbine housing on a VVT engine would be pretty bauce.
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Old 03-28-2012, 03:55 PM   #8
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I agree. Would make a really nice 225-250rwhp turbo.


also looks like if you have access to a machine shop, you could make the same happen.

need to go to GT28XX to get the cool Tial v-band housing or the one with integrated EWG.
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Old 03-28-2012, 04:06 PM   #9
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Quote:
Originally Posted by Braineack View Post
I agree. Would make a really nice 225-250rwhp turbo.


also looks like if you have access to a machine shop, you could make the same happen.

need to go to GT28XX to get the cool Tial v-band housing or the one with integrated EWG.
I think the GT2860rs is still a viable option for daily driving, especially if you're using a tubular manipheould.
I have a GT2860rs .86 turbine housing, slight overbore, low compression, and 99 head and I'm seeing about 200wtq at 2700rpm. If I had a VVT head on that car, man it would be crazy low. I realistically feel like the car "moves" at 2250rpm even with the trailer on it. When I'm cruising on the highway, I leave it in 6th unless we go below 2500rpm because it just looks weird and it's not a Corvette, lol.
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Old 03-28-2012, 04:48 PM   #10
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Yeah, looks of the milled v-band housing is not a big deal because it will be for the most part completely hidden away. I just want it for the reliability and not having to deal with turbo studs. Downpipe studs I think I can deal with.

This is just for an idea I have working in my head right now, we'll see if it ever comes to fruition.
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Old 03-28-2012, 04:50 PM   #11
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well you can always bolt on a vband adapter on the outlet...
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Old 03-28-2012, 05:54 PM   #12
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true... would that solve the problems that some people have had with down pipe studs backing out? I dont really see it being THAT big of a problem?

The only think that I'm somewhat concerned about is the fact that while the turbo may only be pushing 5-6psi out of the compressor, there will be exhaust gasses coming out of the motor will be equivalent to 300+whp on a flowed, cammed head. This is why I'm thinking a big 44mm tial would be a solution.
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Old 03-28-2012, 05:56 PM   #13
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i dunno, just saying.
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Old 03-28-2012, 06:06 PM   #14
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Quote:
Originally Posted by falcon View Post
true... would that solve the problems that some people have had with down pipe studs backing out? I dont really see it being THAT big of a problem?

The only think that I'm somewhat concerned about is the fact that while the turbo may only be pushing 5-6psi out of the compressor, there will be exhaust gasses coming out of the motor will be equivalent to 300+whp on a flowed, cammed head. This is why I'm thinking a big 44mm tial would be a solution.
That's not really how it works, lol.
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Old 03-28-2012, 06:10 PM   #15
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You don't know what I'm doing

Lets just say that the motor will be seeing a substantially higher amount of boost than what the turbo will be pushing out.
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Old 03-28-2012, 06:12 PM   #16
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so you're using the turbo for lowend and rotrex for topend. different from how its "normally" done but I can see it working
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Old 03-28-2012, 06:15 PM   #17
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As long as you don't choke out from the small turbine wheel, this plan should work just fine .
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Old 03-28-2012, 06:15 PM   #18
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yay twincharged miata
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Old 03-28-2012, 06:15 PM   #19
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5PSI at the turbo = 1.34 PR
feeding into something else making 12PSI or 1.81PR

1.34 x 1.81 = 2.42 - 1 = 1.42 x 14.7 = 21PSI.

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Old 03-28-2012, 06:17 PM   #20
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Get 1 giant (or 2 large) ewgs to vent that ish and you should no problem with turbine choking.
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