Perfect turbo for 600whp~
Joined: Feb 2001
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From: Abingdon, Md
I don't agree saying one turbo is just like another. The GT42R is much different then the T51R. Same size means nothing. The fact that its a T6 with 2" runners makes a huge difference in spool and power. Not to mention the dual ball bearing option. Hell my turbo spins for almost a full minute after I shut my car down, lol....
Front Range Express
Joined: Jul 2004
Posts: 571
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From: Colorado Springs
I'm not positive about this, but I think that the hot side on the 500r is too small to permit good enough flow at those power levels. I think you're right about the cold side, but that's just half of the equation. Suppose it can be done with the 500r, I bet the resulting EGTs would be so high that your motor wouldn't last long.
Front Range Express
Joined: Jul 2004
Posts: 571
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From: Colorado Springs
Super Mod-
You're going to have to take that up with the guy you bought your turbo from, since he's the author of that PM! To be fair, I don't think he was comparing any ol t-51 with your t-6 frame gt42r. No doubt in my mind when he said that he was comparing t-4 frame with t-4 frame and a ball bearing t-51. These would be more alike than different. They would be more alike each other than say compared to a gt4094. Yeah, I forgot the "r" at the end. We all know to compare ball bearing to ball bearing and t4 to t4.
You're going to have to take that up with the guy you bought your turbo from, since he's the author of that PM! To be fair, I don't think he was comparing any ol t-51 with your t-6 frame gt42r. No doubt in my mind when he said that he was comparing t-4 frame with t-4 frame and a ball bearing t-51. These would be more alike than different. They would be more alike each other than say compared to a gt4094. Yeah, I forgot the "r" at the end. We all know to compare ball bearing to ball bearing and t4 to t4.
The following paragraph is a Private Message response to me about finding the right 600 whp turbo. The author is very experienced in this area at these power levels. I had a thread like yours last spring, and I concluded that the gt4094 was the best choice if the goal is 600whp.
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A T51 is essentially a 42R, minor minor differences. I would say a good setup might be a 4094 or even the smaller 42(94)R. The issue is spool. And the larger the turbo the longer the spool. You can offset this with other things but it will never be quite as responsive as say a 35R. The 500R would be hard pressed to get you 600hpyou would have to wring the crap out of it is my guess.
Quote:
Originally Posted by III Gen X
As for the level of build, it has everything. It formerly had a t-88 on it running 30 psi and nitrous. When I bought it, I wanted something more streetable so I went with a T-61 and only ran 22psi. The car now has a new owner and he wants to hit the 600whp mark. Since the gt42r can support over 700whp, I'm guessing there is a smaller turbo that'll get the job done. I thought about the 500r, but I don't know anything about its hot side flow capabilities. Will the 500r flow enough on the exhaust side for this power level? Or should I be thinking about one of the gt40 combinations and which one. The car is street driven and owner wants both quick spool for street racing and plenty of top end to boot. He thinks the t-51r kai is where it's at, but I told him you might have other ideas. THanks!
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A T51 is essentially a 42R, minor minor differences. I would say a good setup might be a 4094 or even the smaller 42(94)R. The issue is spool. And the larger the turbo the longer the spool. You can offset this with other things but it will never be quite as responsive as say a 35R. The 500R would be hard pressed to get you 600hpyou would have to wring the crap out of it is my guess.
Quote:
Originally Posted by III Gen X
As for the level of build, it has everything. It formerly had a t-88 on it running 30 psi and nitrous. When I bought it, I wanted something more streetable so I went with a T-61 and only ran 22psi. The car now has a new owner and he wants to hit the 600whp mark. Since the gt42r can support over 700whp, I'm guessing there is a smaller turbo that'll get the job done. I thought about the 500r, but I don't know anything about its hot side flow capabilities. Will the 500r flow enough on the exhaust side for this power level? Or should I be thinking about one of the gt40 combinations and which one. The car is street driven and owner wants both quick spool for street racing and plenty of top end to boot. He thinks the t-51r kai is where it's at, but I told him you might have other ideas. THanks!
Last edited by Old Slow Coach; Dec 2, 2007 at 05:57 PM.
Thread Starter
Nissan Convert
Joined: Nov 2007
Posts: 66
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From: Fort Collins
Anyway, from the all the information here, I am betting a 42R with a T6 hotside should be what I am aiming for (if I go over 600hp, oopsie lol no harm in that). I am planning on ordering the kit from Aspec when the time comes...Now I just need to research porting and AI options a little more and actually get myself a project car...
Front Range Express
Joined: Jul 2004
Posts: 571
Likes: 0
From: Colorado Springs
Front Range Express
Joined: Jul 2004
Posts: 571
Likes: 0
From: Colorado Springs
74mm compessor/1.05A/R T6 frame
I don't agree saying one turbo is just like another. The GT42R is much different then the T51R. Same size means nothing. The fact that its a T6 with 2" runners makes a huge difference in spool and power. Not to mention the dual ball bearing option. Hell my turbo spins for almost a full minute after I shut my car down, lol....
I don't agree saying one turbo is just like another. The GT42R is much different then the T51R. Same size means nothing. The fact that its a T6 with 2" runners makes a huge difference in spool and power. Not to mention the dual ball bearing option. Hell my turbo spins for almost a full minute after I shut my car down, lol....
You and all the other bandwagonners can talk about your 2" runners and how long your shaft spins after you turn off the motor. You don't know uppie from downie? 74mm "compessor"? LOL! You misspelled it!!! It's spelled "TURBINE"
Front Range Express
Joined: Jul 2004
Posts: 571
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From: Colorado Springs
Ernie- I wish I could delete this.... you were probably talking about the size of the inducer and I'm used to most people talking about the exducer size which is 102mm, so I thought you must have been referencing the turbine wheel. My bad! Sorry!
A 4294R has a much nicer wheel ratio than the 4094R I would bet that with a properly designed manifold and a 1.0 Tial housing you would get the same or better response than a 4094R with the .95 A/r all while making more power.
The 500R has the compressor to hit 600hp and it may with the larger A/r on the back 1.06 or 1.15 I would never sell it as a 600hp capable turbo. While it may be able to pull it off it is not what it should be sold as. It is designed to give performance equivalent to a TO4Z with crisper reponse and that it does.
The 500R has the compressor to hit 600hp and it may with the larger A/r on the back 1.06 or 1.15 I would never sell it as a 600hp capable turbo. While it may be able to pull it off it is not what it should be sold as. It is designed to give performance equivalent to a TO4Z with crisper reponse and that it does.
Senior Member
Joined: Oct 2002
Posts: 644
Likes: 1
From: scranton nd
and i am torn on whether to go to a 4294 or a BW S475 in efforts to get a better ratio between the wheels for responce like you speak of.....
Zero R would there be a notable difference in response between a 4202 and 4294 standard bearing??
thanks you
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