Anyone running a Pt-70 .82 AR?

[RUQWKNF27]

4" inlet and 2.5 outlet. What convertor do you run ? Thinking about swapping form Te-45a any opinions?

 

[RUQWKNF]

Depending on what turbine wheel it has is the real determining factor. With it having what sounds like a TO4S compressor cover, my bet would be that it has a P-trim turbine wheel, as all of Precisions PT70 turbos come standard with the H cover. (4" inlet, 3" discharge) If so here's what I'd recommend.

70 with a P-trim turbine wheel and a .82 Garrett housing needs a 3500-3600 flash stall 9" converter to spool up quickly on the foot brake.

70 with a GT-Q turbine wheel and a .82 Garrett or for that matter a .85 PTE housing, on a 235 CI motor, needs a 3900-4000 flash stall 9" converter to spool up quickly on the foot brake.

I had my best results in the past running a real Art Carr 9" 19930 converter that flash stalled to 3500 with my old Limit LT70 P-trim turbo. When I stepped up to a 74 GT-Q with a PTE .85 A/R I had the converter loosened to a 4000 flash stall, which was way too much converter when coupled with a 274 CI motor. It would spool up so fast, I had to be careful when racing the car not to launch it at too high a boost level.

Transbrake equipped applications can get away with a slightly lower stall converter on 235ci motors.

There is about a 85-90 hp difference between the TE-45a and a 70 P-trim with an S compressor cover. Nice upgrade and you should be able to run the same converter if the housings A/R #s were the same, might have to loosen it up a couple hunnerd if going from Garrett .63 to Garrett .82.

Hope this helps.

Patrick

 

[RUQWKNF27]

Well the turbo I have has no real identifying marks on it showing it's a precision according to there website under"how to identify our turbo's". But on the exhaust hosing it has these marks.
M3
G
A
R
.82
Just as I have posted in this other thread!

Lets just say its a Pt-70 4" inlet 2.5" outlet. P-trim .82 AR Do you think it will be streetable with my 3400 LU convertor. It's a Bruce 9/11 model!

 

[Dusty Bradford]

Streetable and spoolable are two totally different animals:biggrin:

A tight converter drives well on the street but might take 100 feet to get into boost.

A 3400 may be a little on the tight side with a 70 but the p trim will offset it a little. It may or may not build boost quickly. Your right on the line. A lot also depends on the timing map and a/f ratio.

 

[RUQWKNF27]

Kinda what i figured ! Hey is this similar to the turbo Chris is running or was?
My timing is 23 Deg and AF is 11:0. I know I can bump the timing somemore. I got dual alky on it now and running 26 lbs with no knock. May bump the boost back and add some timing. I know the 45a is enough for my car and spool could not better on the street. I guess guys always want bigger things!

 

[RUQWKNF]

If your TE-45a turbo has a .63 A/R housing on it now, and this 70 turbo has a P-trim turbine wheel, then your .63 A/R housing, whether it be a Garrett or a PTE should be a direct bolt on. If this is the case, you wouldn't have to change a thing. Just ride. I would make sure the wheel doesn't touch down when being rotated before running it after the housing swap tho. Save the .82 housing for when you upgrade the converter.
That is what I would do, especially if it's a smokin deal. How many blades does the turbine wheel have? 11 or 10? Can you pop the turbine housing off and take measurements of the inducer and exducer of the wheel?

Patrick

 

[RUQWKNF27]

14 blades on induction 11 on exhaust.

When removing the exhaust housing is it as simple as taking the bolts out and putting my .63 on it? Also and making sure the exhaust wheel does not scrub? I guess it would not since mine is a 2.5 outlet too but guess you never know with different manufactures.

 

[Dusty Bradford]

Kinda what i figured ! Hey is this similar to the turbo Chris is running or was?
My timing is 23 Deg and AF is 11:0. I know I can bump the timing somemore. I got dual alky on it now and running 26 lbs with no knock. May bump the boost back and add some timing. I know the 45a is enough for my car and spool could not better on the street. I guess guys always want bigger things!

For spoolup the timing and a/f has be tweaked down low..3rd gear set-up has nothing to do with spool-up. This would be base settings, like in the 3000-4000 range.

 

[J-B Racing]

4" inlet and 2.5 outlet. What convertor do you run ? Thinking about swapping form Te-45a any opinions?

Like I told you on the PM's you sent me. That Turbo was once mine.
It has a 4" INLET and a 3" OUTLET Discharge NOT...NOT...2.5"
I don't understand that you do NOT see that.
4 IN
3 OUT
I am sure the vendor has told you the same thing. I ran that Turbo with a Art Carr 19930 ( 3500 Stall ). If you don't have the Converter, don't get the Turbo. I specifically installed the .82 Garrett to have both worlds. I have come out with 1.40's with Stock Ported Heads and going over 130 MPH.
10 lbs of boost launches. Do the MAth...

Joe

 

[RUQWKNF27]

If I new you added a different .82 Exhaust housing and yes it is 2.5 and no Vader did not change it. And me and my tape see 2.5 not 3.0. Its not a big deal dude just trying to find out why things were mismatched.

 

[J-B Racing]

Which part of the Turbo are you measuring. I think you are measuring the Exhaust Hosuing Hole. That is NOT how you differ the size.
The Compressor Housing is what we nrmally talk about.

 

[Dusty Bradford]

When measuring outlet size of the compressor housing, you have to measure O.D (outside diameter) of the outlet. Not sure how your taking the measurement.

Take a pic of the outlet with the tape Chris if you need to.

 

[RUQWKNF27]

This may be my mistake I was measuring the outlet side the down pipe connects too. Not the outlet that feeds to the intercooler! That outlet is 3". For some reason I thought on the exhaust wheel it should be 3" also!!