4.90 second 60-130 (4.23 100-200 kph) with 2 shifts
#93
05-23-2007 | 10:27 PM
Moderator
Joined: Jul 2003
Posts: 22,235
Rep Power: 1226
Originally Posted by TRK
Buddy,
One thing Garrett's not telling you in those catalogs, is those are MAXXED out numbers on those turbos at CRAZY boost pressures to get there. We're making a lot of power with much less boost, and tend to be compressor limited at the lower pressures. For instance, a GT3071R has a 50lb compressor, Garrett rates it up to 460hp, but we're only seeing 9.25hp/lb/min, so I'd rate it at 425.5hp... However, it only produces that flow at 2.2 bar! It's almost 20% less at 1.2-1.4 bar boost where we'd be comfortable running it. And at those levels, it's out on the 55% efficiency island, so you're producing a tremendous amount of heat. And that's in a large Garrett housing, not a recontoured k24 compressor housing... Even in the smaller T04B style housing, they just ran into a wall on Jamies at 630whp or about 741crank, which is saying they're only flowing about 40lbs in that configuration.
The GT3076r's started converging at high rpm at 830rwhp on Scott's or 976crank. They have a 52lb compressor, and at 9.25hp/lb/min that's 481hp each, or 962hp for the pair... So we were right on with those, but those had the huge 4.0" inlets and landed in some nice efficiency islands.
On the GT35R's, they say 600hp, but with a 62lb compressor, at 9.25hp/lb/min that's 573hp/turbo or 1147hp at the crank, for about 974whp on a dynapack, or 940whp or so on a dynojet... Unless you're willing to run huge boost pressures, the 35r's seem to like 30+psi of boost and get really happy there. But we're not playing with Mitsubishi's and Honda's that you can get a replacement block for $800.00 ;p
So, 42r's, I believe would be pretty excessive, unless you were only after dyno numbers. They'd be pretty bad on lag, probably not coming on till 6000rpm's or so. You may improve that with 4.0 or 4.2L and nitrous down to 4000 rpm's or so which would be nice. But that would really only be for drag racing. Otherwise, you'd forever be refilling your bottle ;p Or tolerate monsterous lag. vralexander put a set on his supra, but they run to 10,000 rpm's, so 6000 rpm onset is ok... and he had some supercharger and nitrous to get them going...
Sorry, enough rambling.
One thing Garrett's not telling you in those catalogs, is those are MAXXED out numbers on those turbos at CRAZY boost pressures to get there. We're making a lot of power with much less boost, and tend to be compressor limited at the lower pressures. For instance, a GT3071R has a 50lb compressor, Garrett rates it up to 460hp, but we're only seeing 9.25hp/lb/min, so I'd rate it at 425.5hp... However, it only produces that flow at 2.2 bar! It's almost 20% less at 1.2-1.4 bar boost where we'd be comfortable running it. And at those levels, it's out on the 55% efficiency island, so you're producing a tremendous amount of heat. And that's in a large Garrett housing, not a recontoured k24 compressor housing... Even in the smaller T04B style housing, they just ran into a wall on Jamies at 630whp or about 741crank, which is saying they're only flowing about 40lbs in that configuration.
The GT3076r's started converging at high rpm at 830rwhp on Scott's or 976crank. They have a 52lb compressor, and at 9.25hp/lb/min that's 481hp each, or 962hp for the pair... So we were right on with those, but those had the huge 4.0" inlets and landed in some nice efficiency islands.
On the GT35R's, they say 600hp, but with a 62lb compressor, at 9.25hp/lb/min that's 573hp/turbo or 1147hp at the crank, for about 974whp on a dynapack, or 940whp or so on a dynojet... Unless you're willing to run huge boost pressures, the 35r's seem to like 30+psi of boost and get really happy there. But we're not playing with Mitsubishi's and Honda's that you can get a replacement block for $800.00 ;p
So, 42r's, I believe would be pretty excessive, unless you were only after dyno numbers. They'd be pretty bad on lag, probably not coming on till 6000rpm's or so. You may improve that with 4.0 or 4.2L and nitrous down to 4000 rpm's or so which would be nice. But that would really only be for drag racing. Otherwise, you'd forever be refilling your bottle ;p Or tolerate monsterous lag. vralexander put a set on his supra, but they run to 10,000 rpm's, so 6000 rpm onset is ok... and he had some supercharger and nitrous to get them going...
Sorry, enough rambling.
We were concerned with the 4.0L stroker (102 mm bore/80 mm crank) and the shorter rods. The cylinder pressure of these shorter rods on the thinner 104 mm liners (4.2L) would be a little scary. Especially when you add the nitrous.
Last edited by cjv; 05-23-2007 at 10:32 PM.
#95
05-23-2007 | 10:45 PM
Registered User
Joined: Jun 2006
Posts: 1,898
From: LA
Rep Power: 94
TODD... dam can we swap brains for a bit.. lol
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
#96
05-23-2007 | 10:58 PM
Originally Posted by Me_qwkr
TODD... dam can we swap brains for a bit.. lol
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
__________________
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#98
05-24-2007 | 03:03 AM
Registered User
Joined: Apr 2005
Posts: 715
From: SoCal
Rep Power: 50
Originally Posted by Me_qwkr
TODD... dam can we swap brains for a bit.. lol
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
Is the motor built, does it flow very well?
My 74mm turbo with .96 AR gives up at 31psi or so, it just cant breathe anymore then the engine can flow.
You need a bigger turbo.
#100
05-24-2007 | 07:17 PM
Awaiting Email Confirmation
Joined: Mar 2004
Posts: 611
From: Sydney, Australia
Rep Power: 0
Originally Posted by Me_qwkr
TODD... dam can we swap brains for a bit.. lol
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
VRAlex gave me a GT40 for my GT-R and said it should push boost before 5k rpms.. mind you i have a 2.7l... Currently i am running a T04z... and cant get it to past 28pounds.. How can i get it to boost more.. any ideas?
#102
05-24-2007 | 09:42 PM
Registered User
Joined: Apr 2007
Posts: 364
From: NorCal
Rep Power: 32
Originally Posted by WOODTSTER
2.0 weeks and counting until I start decimating unsuspecting Camaro driving Mullet heads 
MK
MK
http://para.noid.org/~lj/SacTrapsVideoMPEG1.mpg
Looks stock, goes fast. I don't have enought hair left for a mullet.
Jeff
#104
05-26-2007 | 04:57 PM
Thread Starter
|
Registered User
Joined: Jun 2005
Posts: 8,510
From: Virginia, USA
Rep Power: 788
Originally Posted by Zippy
Holy ****e Scott your car is smokn'!!!!
It's very exciting to see the "next big thing" come out of Protomotive.
Todd & Cynthia are amazing.
I nkew you were a very skilled 1/4 mile track animal, but for the life of me I can't figure out how you can accelerate with the clutch depressed? How do you do that?
It's very exciting to see the "next big thing" come out of Protomotive.
Todd & Cynthia are amazing.
I nkew you were a very skilled 1/4 mile track animal, but for the life of me I can't figure out how you can accelerate with the clutch depressed? How do you do that?
IRT to powershifting, you just have to shift very quickly so you don't bounce off the rev-limiter. It does take some practice. Also, keep in mind it can be detrimental to your tranny if not done correctly.
I very rarely do it in my P-car, and I haven't done it with my new setup. No need to at this point.
Last edited by Divexxtreme; 05-26-2007 at 05:35 PM.
