turbo selection

2fast4u · 04-17-2007, 05:42 PM

This is for Kris by the way:

ok I'm not planning to get a turbo kit this year, but possibly next year and I'm trying to get everything planned so I know how much saving I'm gonna have to do lol. I am debating between the t3/t4 street brawler kit with the 46trim but possibly the 50 trim and the gt3071r with a .63 turbine housing. I am looking for about 370whp and I was wondering which is the better turbo? I realize the t3/t4 is cheaper but if the gt3071r is better I'll be getting that. I was wondering what are the main differences between the 2?

Will the gt3071r with .63 turbine housing give me the same or quicker spool time than the t3/t4 46 trim? also compare it to the 50 trim t3/t4.

Will the gt3071r with .63 turbine housing give me more top end than the t3/t4 46 trim? also compare it to the 50 trim t3/t4.

Considering these modifications at about 18-19 psi of boost: 264 camshafts (exhaust and intake), upgraded intercooler, 60mm throttle body, RMR intake manifold, 4 inch intake, 3 in. downpipe, 3in. exhaust, all internals beefed up, water injection. (note I don't have all these parts this is just a future setup and I'm trying to get a good idea what my options are) What power range is the gt3071r with .63 turbine housing in. for example 3200rpm to 7200rpm range? the t3/t4 with 46 trim and also the 50 trim? I don't need exact rpm ranges, just a good ball park figure I guess. like will it give me power all the way up to redline, or more, or less?

Uhh I sent you a message, but I'm not sure if you ever read your messages so I posted this just in case, you can reply by message or posting it, it doesn't matter to me.

Thank you for your time, sorry I wrote so much.

Loki · 04-20-2007, 01:04 AM

Hi 2fast4u,
Unfortunately, I do not have dyno testing to compare the t3/t4 versus the 3071. My current best guess is that the 3071 will spool somewhere between the 46 and the 50 trim, but I don't have data to back this up at the current time. I hope to be able to do some testing in the next couple months.

As for the "all internals beefed up", what does that mean for head work? OS valves, fully ported?

As far as my best guess, I believ the 3071 will spool somewhere between the 46trim and the 50 trim. I believe it will make more top end than the 46 and the same or a little less top end than the 50trim. I think at the boost level (18-19) any of the turbo choices should have no problem making good power to 7500rpm. The 46 will be the first to start losing on the airflow side should you go to a higher rpm, or to more boost given your other airflow mods.

I hope that has helped you a little.

04-17-2007, 05:42 PM	#1 (permalink)
2fast4u Speed Racer Join Date: Nov 2006 Location: Daytona Beach, FL Posts: 542 Thanks: 17 Thanked 10 Times in 10 Posts iTrader Rating: (1/100% )	turbo selection This is for Kris by the way: ok I'm not planning to get a turbo kit this year, but possibly next year and I'm trying to get everything planned so I know how much saving I'm gonna have to do lol. I am debating between the t3/t4 street brawler kit with the 46trim but possibly the 50 trim and the gt3071r with a .63 turbine housing. I am looking for about 370whp and I was wondering which is the better turbo? I realize the t3/t4 is cheaper but if the gt3071r is better I'll be getting that. I was wondering what are the main differences between the 2? Will the gt3071r with .63 turbine housing give me the same or quicker spool time than the t3/t4 46 trim? also compare it to the 50 trim t3/t4. Will the gt3071r with .63 turbine housing give me more top end than the t3/t4 46 trim? also compare it to the 50 trim t3/t4. Considering these modifications at about 18-19 psi of boost: 264 camshafts (exhaust and intake), upgraded intercooler, 60mm throttle body, RMR intake manifold, 4 inch intake, 3 in. downpipe, 3in. exhaust, all internals beefed up, water injection. (note I don't have all these parts this is just a future setup and I'm trying to get a good idea what my options are) What power range is the gt3071r with .63 turbine housing in. for example 3200rpm to 7200rpm range? the t3/t4 with 46 trim and also the 50 trim? I don't need exact rpm ranges, just a good ball park figure I guess. like will it give me power all the way up to redline, or more, or less? Uhh I sent you a message, but I'm not sure if you ever read your messages so I posted this just in case, you can reply by message or posting it, it doesn't matter to me. Thank you for your time, sorry I wrote so much.

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04-20-2007, 01:04 AM	#2 (permalink)
Loki KO Racing Dude Join Date: Jun 2006 Location: Hillsboro, OR Posts: 104 Thanks: 3 Thanked 1 Time in 1 Post My Google Map iTrader Rating: (3/100% )	Hi 2fast4u, Unfortunately, I do not have dyno testing to compare the t3/t4 versus the 3071. My current best guess is that the 3071 will spool somewhere between the 46 and the 50 trim, but I don't have data to back this up at the current time. I hope to be able to do some testing in the next couple months. As for the "all internals beefed up", what does that mean for head work? OS valves, fully ported? As far as my best guess, I believ the 3071 will spool somewhere between the 46trim and the 50 trim. I believe it will make more top end than the 46 and the same or a little less top end than the 50trim. I think at the boost level (18-19) any of the turbo choices should have no problem making good power to 7500rpm. The 46 will be the first to start losing on the airflow side should you go to a higher rpm, or to more boost given your other airflow mods. I hope that has helped you a little.