turbine

iTrader: (1)

T67 (TO4r) made by Precision Turbochargers, P-Trim turbine wheel, A/R .70 on the compressor side and A/R .81 on the exhaust side.
i am looking for reasonable power with quick spool time
i want to use it on a half bridge what do you think.

crispeed

What is reasonable power?
That turbo does spool up quick more so on a BP motor.

classicauto

iTrader: (3)

If reasonable power is +450whp then its great. I loved my T04-R. It was a genuine Garrett version, not a PT67 though.

Viper GTSR

When you guys say "450RWHP"...are you referring to pump gas (93oct) numbers @ ~15-16psi? Or race fuel and higher boost numbers...? Thanks.

Jason

iTrader: (5)

.81 A/R is to small for a HB. Go with a larger A/R

classicauto

iTrader: (3)

450 on pump is approaching/cresting the saffe limits. The T04-R will do 450whp at or around 18-20psi depending on a few things obviously.

But it really wakes up after 20+ though

Viper GTSR

When you say "450rwhp is approaching/cresting the safe limits on pump" are you specifically referring to when running the T04R & 67 class singles or the close to the max. you can run on a rotary on pump period? Thanks.

I'm new here, looking to build a fast FD RX7 and want to absorb as much of ur experiences/knowledge as I can

Gorilla RE

iTrader: (1)

A T04-R can and will make 450rwhp @ 15-16psi "depending on a few things".
-J

coxxoc

iTrader: (3)

I don't know exact power numbers, but at a 17psi street only break in tune (see pig rich with very conservative timing) on 91 pump (no meth) my car trapped 115. The car is faster than a buddy's FD that puts down 11.65 with drag radials. I'm all tire spin in the first three gears with 18's.

This is a .84 turbine housing Garrett TO4R. Boost comes in quickly with full boost by 3700-4000 RPM on my large street port.

TO4R is a fun turbo, but you probably will want a bigger hot side with a bridge.

Josh

silentblu

iTrader: (1)

what would be an idea hotside for a HB?

classicauto

iTrader: (3)

I'm talking limits of octane on the rotary at that point.

I ran a 1.00A/R on a T04-R HPB and saw full boost (15psi) by 4K on a semi-decent tune. Thing just went nuts from there to redline. I dunno if I'd run anything much smaller then a .96 on a half bridge.

BDC

+1 it's a great turbo. Nice compressor. Friend of mine made 506 to the wheels with 387ft/lbs torque with this exact combo on a street ported motor at 24-25psi of boost.

B

Viper GTSR

So "~450RWHP" is virtually the MAX of what one can achieve reliably on a rotary period (on straight 93oct pump)?? What you're essentially saying is that's (450rwhp) the point where rotor housing pressures reach the brink of detonation with 93oct. to work with...? If thats true, that depressing...

turbine

iTrader: (1)

hey BDC what do you think about the half bridge on this turbo?

BDC

I'd say give it a try with one-sized higher turbine housing (0.96 A/R)!!

B

1wide7

iTrader: (1)

i dont know of many that have gone over 450 with straight 93 octane because most tuners wont go above 16 or so psi on pump and any turbo that is large enough to make 500+whp is not in its sweet spot at that low of boost
but there is always meth injection to go beyond that point on 93

classicauto

iTrader: (3)

Virtually. There's a few tuners (crispeed is the only one I know of) who say 500whp all day on pump with the right setup that is immaculately efficient. But for the average Joe with the average setup capable of 450+.........450 is about as far as you'll push it reliabely with 93 alone. Depressing I suppose, but a 450whp RX-7 is no slouch.