FD3S_wanted

iTrader: (5)

I'm considering one of these 2 turbos for my 13B-RE FC. I have done some research on these. I know the compressor are the same. I'm more concerned about the turbine. The T04R turbine would have a 1.00 a/r with a p trim wheel and the PT67 would have a .81 a/r with a q trim. I'm not familliar with turbine wheel trim. Which one will boost faster ? Which one will have more top end ? I want to boost 20 psi max.

T04S is also in my choice, but it's smaller so I don't know...

Thanks!

Other inputs are welcome

Alex

dvls-7

I believe you can get the 67 with a .96 hot side and still have the Q trim. Kind of a happy medium.....

Turbo II FC

iTrader: (14)

Id recommend the T04R with the 1.00 A/R. The PT67 will spool faster but not have as much top end. That would be my decision anyway.

Carl Byck

Those turbos are very close the PT67 GTQ lives for boost above 20 psi, there are huge gains with that turbo between 25, and 32 psi. Like 100 more rwhp on a MKIV supra. ~760rwhp@32psi through a cast manifold is a number from the MKIV guys(I am one, but I have a P trim good for ~675rwhp@28psi). Roger(kabooski) has the 67 .81, but he is not sure if it is a P, or Q trim. I'd say based on his 520@20psi, that a 67 .81 is good for ~600+, so since it spools faster, and there a ton for sale used that would be my choice. I'll be testing a .67, and a .81 P trim 67, and a T66 .81 Q trim(currently on the car) for road race. the goal is the fastest spool, that can get me ~450-500rwhp@25psi.
FWIW a .84 Q trim 67mm DBB turbo gave Chris Roth ~470@19 psi, I just do not see a downside to these, and I have certainly not seen a TO4R over 600, which the 67 is easily capable of. Carl

Trav

Carl, I'm looking forward to your test results. The .67 P trim seems intriguing. With that small of A/R but yet still capable of 500+hp -- wow... I can only imagine that thing will spool up like mad! Seems like if you can get that much HP & torque that low in the powerband, then it would be a fantastic choice for our vehicles.

Where's a good source for these turbos? Most everywhere I look sells the Garretts, but admittedly that's all I've looked for w/ any effort.

FD3S_wanted

iTrader: (5)

Are you talking with a P trim or Q trim ? Where can I get one used ? I wanted to check on the supra forum, but I can't access the biggest (supraforums.com)

Thanks!

Trav

Yeah I actually did the same thing and you can't search unless you register and you can't register. hmmph.

Carl Byck

Just register, they sell eveyday for ~800.00 with low miles. take a second to register.Go to the race forum, and look for my posts, my sig is "in2twins" As far as P trim vs Q, If Roger ould look at his I could tell you, as it sits now i have both, but am redoing my fuel to supprt the higher HP, so we'll have to wait unless Roger looks at his. Carl

kenn_chan

Carl, the supra forum comes back with a message that the administrator has diasabled this function, IE: it won't allow you to register.

kenn

FD3S_wanted

iTrader: (5)

Exactly...

Carl Byck

Well, if someone knows what they want, I'll help hook them up, that seems very strange though, I'll check that out.

carx7

iTrader: (31)

I agree with carl. I have... essentially... a PT67 with a BB CHRA. I'm running a custom fully divided manifold and divided turbine housing. My setup made 15psi by 3500, 19psi by 3900 RPM and did 467RWHP @19psi on 100 octance. Kabooski made even more power with his ,8x housing.

Plently of power can be made with the smaller housings and a high flow wheel. I'd get the PT67 for sure!

-Chris

jacobcartmill

iTrader: (6)

what size hotside housing did you use chris?

Bukwild

I talked to the owner at Precision turbo and when I told him that rotary guys were laying down huge numbers at around 20lbs he kinda didn't believe me. He was not a fan of his 67. He said the grand national crowd just loves the 74 and 76. But thats drag only so.

13btnos

iTrader: (1)

Check this site out http://theracingstore.com/turbos_pt_67.html . The owners name is Tony Negron great person to do business with. He's an authorized dealer for Precision Turbo. I got my turbo from him it's a PT74GTS .96 hotside and he gave me the best price for it brand new. He is very knowledgeable with rotarys and can help you pick out a turbo. Tell him Mac sent you. Oh yeah the Precision guys they deal a lot with Buick and Ford Mustangs so that's basically the feed back you'll get from them. But a lot of rotary guys have been successful with the Precision turbos. Good luck.

Carl Byck

The 74s, and 76s are great for 800-1000rwhp, but can you support it/use it? Check my response on the 42R thread. Several Supra guys are making 800-1250 with those turbos, power comes on at 5500rpm on a MKIV, and gains ~500-800rwhp in 1500rpm, try and hook that... ****, my PT67 on my MKIV will go from ~275rwhp at 3800rpm to 650+ at 5000rpm, thus Race Logic TC is my(and especially my wifes) friend Carl

Bukwild

damn Carl that has to be one serious rush. If you could get that to plant to the ground their would not be many cars on the street that you couldn't walk away from.

Trav

^^^Careful, you might get some rotary enthusiasts to convert if you say that too loud.


Are there any compressor maps published for these PT67s? I'd like to compare...
Specifically, I'd like to know if I'll have to boost in the 20s for this turbo to operate at it's efficiency. My setup sounds similar to FD3S_Wanted, and I'd prefer to run in the mid to high teens PSI. Best gas I can get from a pump here is 91octane, so I don't think I can get much higher than that.

Bukwild

91 ouch. sounds like you are going to become a big fan of water or propane injection.

13btnos

iTrader: (1)

My friend in Orlando, FL swears by the PT74GTS turbo. He recently put down 680rwhp @ I believe 35psi boost with this turbo. Mind you this was done with a hurt turbo. He had blown an apex seal which had clipped the wheel and he was just anxious to get the car running. He has since fixed the turbo and is going to dyno and is shooting for 42psi boost. He has a 3/4 chassis datsun 1200 with 13rew streetported and running on alcohol, with a Microtech LTX12S with 10 injectors. I'm basically running the same setup as him except I will run VP C16 alcohol is to complicated for me. And the intake setup is different he runs 1100cfm holley style throttlebody with Jay-Tech manifold and mine is a stock intake with an open plenum running an LS1 80mm throttlebody. So yes it can you can support it/use it.

SPL Dan

I had a TO4R with a 1.00 P Trim on my car and at 20psi it made 523RWHP

I now have a PT67 with a custom 72mm inducer and at 20lbs I made 596rwhp ... The PT67/72 has a .96 GTQ Turbine side ...

At 25lbs the car is just unreal and I have no dyno numbers yet .. This is on a 13BT with an FD UIM though on a 13B-RE You might have more power . My motor is Full Bridge

Trav

SPL Dan, how does you spool compare on the 2? Some data points of what RPM you saw various boost levels would be helpful (if you know).

I would assume the PT would be slightly sooner due to the smaller A/R, but then again your T04R had the divided housing so I'd think they'd be very close (assuming all things being equal). Throwing all that out the window, I'm curious which turbo design has better spool characteristics (and by how much).

SPL Dan

The PT makes boost much sooner .. Even though the TO4R was a divided housing . I was actually quite suprised ..

The TO4R would pull around 10lbs by 3200 and the PT is already into the teens by then .. I make my 20lbs by 4600 ... Boost isnt very linear then around 3500 RPM all hell brakes loose and its hard to tell anything ... I'll try a run and look at the playback on the DEFI's and see what boosts it is seeing and try to reply back ..

It will probally be tomorrow though as its raining here and driving my car would eb suicide right now ...

TEZTnTUNE

the pt67 thru 74 turbos are perfect for 2 and 3 rotor engines. these turbos were designed for 2.4L and up piston engines. so naturally they would be awesome for the rotary. i swear by the pt67 for stock to agressively ported 13b's. ask kabooski he made 479whp@14 psi on his pt67

FD3S_wanted

iTrader: (5)

Chris which turbine housing and turbine wheel are you using ?

I become more and more interested in the precision turbo. Is there other store that sells the PT67 ? I search on net, but they are hard to find. I would also like to see compressor map from both turbo.

Thanks for reply all!!! Really appreciate...