I am currently making some changes to my setup and was wondering if anyone has any opinions on my turbo setup.

I am have been using a Turbonetics 62-1 Big-shaft P-trim 0.69AR full T4 turbo and have made 500-525whp at 15psi on 94pump. Since I have not yet upped the boost and thrown C-16 at the car...im not sure what the horsepower of this turbo will be limited to.
It appears that I will be able to at least make 650whp with this turbo in place...but does anyone know what I should except at what boost number? I realistically want to run between 700 and 850whp at high boost. If this turbo could ever get to 700, then I would likely not change it.

Any suggestions or ideas would be appreciated.

 

That turbo is going to be running out of breath by about 650 WHP. You might be able to squeek 675 out of it if you really lean on it. If you want to make 850 WHP I'd make the jump to something like a GT42R.

 

What type of spool up time and min/max psi is that turbo good to? What about any non-ball bearing options (like a GT35, GT40, T72, T76, ?)?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by XES &raquo;</TD></TR><TR><TD CLASS="quote">What type of spool up time and min/max psi is that turbo good to? What about any non-ball bearing options (like a GT35, GT40, T72, T76, ?)?</TD></TR></TABLE>

A GT42R should be making full boost on a big 2.3L motor like yours by ~6500 RPM's? I think Tony1 posted a graph of a 2.0L 42R car that was making full boost by right around 7000, so spool up is reasonable for how damned big this turbo is. I don't know what the theoretical limit to boost would be, but I'd venture a guess in the 40+ psi range. A GT35 is good for about ~650 WHP max, and I don't think you're getting much more than 750 out of a GT40. A T72 and T76 would both do 850 WHP, but I think if you want this car to see the street at all the ball bearings are the only way to go.

 

How much bigger is the turbo housing size (turbine and compressor) of a GT42R than my t4 62-1? I'm wondering how the space will be...assuming I head towards that option.
Also what AR should I be leaning towards in a GT42R?


Modified by XES at 11:26 AM 10/11/2005

 

A lot bigger. A GT42R dwarfs basically any T4 turbo short of a PT88 that I've seen. There's a couple people on here running them, and one guy posted pics of his car with a PT71-GTQ and a GT42R and the 42R is significantly bigger. You'd probably want to run the 1.01 A/R T4 flanged hot side.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboEGhatch &raquo;</TD></TR><TR><TD CLASS="quote">A lot bigger. A GT42R dwarfs basically any T4 turbo short of a PT88 that I've seen. There's a couple people on here running them, and one guy posted pics of his car with a PT71-GTQ and a GT42R and the 42R is significantly bigger. You'd probably want to run the 1.01 A/R T4 flanged hot side.</TD></TR></TABLE>

exactally why its a pointless turbo for a decent power band. 42r's on hondas make about as much sence as the people running t6's on supras, dyno queens or 11k reving drag cars .

gt40r with a moderatly sized exh housing, a t72 would be better but if the itch really gets to ya go with a divided tang housing and properly matched manifold so you don't have to rev the **** out of it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16hybridsol &raquo;</TD></TR><TR><TD CLASS="quote">

exactally why its a pointless turbo for a decent power band. 42r's on hondas make about as much sence as the people running t6's on supras, dyno queens or 11k reving drag cars .

gt40r with a moderatly sized exh housing, a t72 would be better but if the itch really gets to ya go with a divided tang housing and properly matched manifold so you don't have to rev the **** out of it</TD></TR></TABLE>

That's good and fine and all, but a GT40R will not make 850 WHP, and a GT42R will spool up quicker than a T72.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99Hybrid_Hatch &raquo;</TD></TR><TR><TD CLASS="quote">turbo spools up very nicely (about 1100 rpm faster than the 71GTQ)</TD></TR></TABLE>

He's talking about a 42R on his car. If it spools better than a 71 it's spooling quicker than a T72.

And obviously T6 turbos are doing OK on Supras if Woon can go 8's with a 6-speed on a T6-frame turbo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboEGhatch &raquo;</TD></TR><TR><TD CLASS="quote">That's good and fine and all, but a GT40R will not make 850 WHP, and a GT42R will spool up quicker than a T72.

He's talking about a 42R on his car. If it spools better than a 71 it's spooling quicker than a T72.

And obviously T6 turbos are doing OK on Supras if Woon can go 8's with a 6-speed on a T6-frame turbo.</TD></TR></TABLE>

What about the spooling on a non-ball bearing GT42R? I know i will be able to crack the 800 mark...but how much will it suffer on the street.