How quick are PT-88 guys running?
Thread Starter
Joined: Nov 2001
Posts: 32,987
Likes: 58
From: Houston, TX
How quick are PT-88 guys running? I'd be interested in knowing how quick/fast some of the guys with a PT-88 turbo are running. These things are rated at 1200 crank HP, anyone pushing the limit on them yet?
Trying to estimate where my car *might* run ET/MPH wise, and if I should just go with a bigger turbo.
408ci iron block
8.5:1 CR
AFR 225 heads
Edelbrock intake w/ elbow, 90mm t-body
Figure ~3100 lbs raceweight. Car has a powerglide with t-brake.
Also, could someone explain to me why both the GT47-88 and PT-88 are considered "88mm turbos" but the GT47 is about twice the physical size?
Thanks,
Tony
Trying to estimate where my car *might* run ET/MPH wise, and if I should just go with a bigger turbo.
408ci iron block
8.5:1 CR
AFR 225 heads
Edelbrock intake w/ elbow, 90mm t-body
Figure ~3100 lbs raceweight. Car has a powerglide with t-brake.
Also, could someone explain to me why both the GT47-88 and PT-88 are considered "88mm turbos" but the GT47 is about twice the physical size?
Thanks,
Tony
SSU Moderator
Joined: Nov 2001
Posts: 4,857
Likes: 0
From: Austin, TX
PT-88 = T4 and I think that will be your limitation. I see high backpressure in your future (if you are serious about pushing the limits of the turbo, especially with 408cid). If you are building your own kit anyway, T6 is what you need for sure...unless you do twins. I mean its a race car, right? Nut-up and put a 91mm+ on the car like 'Wormboy'.
BTW - 88mm is the size of the wheel, the case its in can vary in size (within reason). Obviously, the bigger the turbo the higher the ceiling, but there are exceptions. You have the money I think...call Jose and just have him build you one.
BTW - 88mm is the size of the wheel, the case its in can vary in size (within reason). Obviously, the bigger the turbo the higher the ceiling, but there are exceptions. You have the money I think...call Jose and just have him build you one.
Thread Starter
Joined: Nov 2001
Posts: 32,987
Likes: 58
From: Houston, TX
Ryan, its a drag car, but I want to be able to go rounds without a pit crew 
I've been emailing with Precision about possibly upgrading the turbine to T6, and will probably do so. I'll be building my own kit most likely, unless I see a used set of hot side pipes for sale that are already built.
Tony
I've been emailing with Precision about possibly upgrading the turbine to T6, and will probably do so. I'll be building my own kit most likely, unless I see a used set of hot side pipes for sale that are already built.
Tony
they dont have listed anymore but on precision's home page they have a mustang featured with a 347, powerglide at 3100lbs running consitant 8.90's
id stay with 370 cubes or smaller with that T4 frame.
you do have the option of putting a T6 exhaust housing with a 5" outlet on that PT88
id do that if your wanting to use a 408.
what are you wanting to run? Im gussing that turbo is good for high eights with that weight. probably 8.7-8.9's
the gt 47 has a bigger frame obviously. i think the exducer is bigger on the 47-88, but i could be wrong as ive heard precision uses their wheels from garrett, and they might have gotten that one from the 47-88. The housing on the 47-88 is also bigger with a bigger AR and a T6 flange, not sure of the exhaust wheel size in comparision though
id stay with 370 cubes or smaller with that T4 frame.
you do have the option of putting a T6 exhaust housing with a 5" outlet on that PT88
id do that if your wanting to use a 408.
what are you wanting to run? Im gussing that turbo is good for high eights with that weight. probably 8.7-8.9's
the gt 47 has a bigger frame obviously. i think the exducer is bigger on the 47-88, but i could be wrong as ive heard precision uses their wheels from garrett, and they might have gotten that one from the 47-88. The housing on the 47-88 is also bigger with a bigger AR and a T6 flange, not sure of the exhaust wheel size in comparision though
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Originally Posted by Nine Ball
Ryan, its a drag car, but I want to be able to go rounds without a pit crew
I've been emailing with Precision about possibly upgrading the turbine to T6, and will probably do so. I'll be building my own kit most likely, unless I see a used set of hot side pipes for sale that are already built.
Tony
I've been emailing with Precision about possibly upgrading the turbine to T6, and will probably do so. I'll be building my own kit most likely, unless I see a used set of hot side pipes for sale that are already built.
Tony
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A PT-88 will push a 3200+ car to mid 8's with the right tune and suspension. It is still 74% efficient even at a 6500rpm (~19psi) on a 408. Give Jose a call and he can explain more stuff over the phone. Bigger is NOT always better. It is an option but may not be the best choice for your motor.
Thread Starter
Joined: Nov 2001
Posts: 32,987
Likes: 58
From: Houston, TX
John, i've heard the same thing too. I guess I would consider this setup a "starter" setup for me to see how things go. If I decide I want to go faster and spend more money on maintenance, I can always upgrade later on.
smokin, I already have a new PT88, FMIC, and wastegate sitting in my garage. Just need to order piping and a blowoff. Fuel system and BS3 are on the way.
Tony
smokin, I already have a new PT88, FMIC, and wastegate sitting in my garage. Just need to order piping and a blowoff. Fuel system and BS3 are on the way.
Tony
Definately, if you wanted to go faster than mid-8's I would look for another turbo as anything below 69% is into the choke line for the turbo. Low 8's to 7's I would go with a 91mm - 94mm turbo. Hope you get this cooking soon, I'd like to see another 8 second LS1. We're building a twin 67mm dual BB turbo '99 T/A ...it should go well down the 1320. 
EDIT: added bold
EDIT: added bold
Originally Posted by Nine Ball
John, i've heard the same thing too. I guess I would consider this setup a "starter" setup for me to see how things go. If I decide I want to go faster and spend more money on maintenance, I can always upgrade later on.
smokin, I already have a new PT88, FMIC, and wastegate sitting in my garage. Just need to order piping and a blowoff. Fuel system and BS3 are on the way.
Tony
smokin, I already have a new PT88, FMIC, and wastegate sitting in my garage. Just need to order piping and a blowoff. Fuel system and BS3 are on the way.
Tony
tony- if you have the turbo and equipment why not just hook it up and see for yourself. turbo piping isnt too expensive and installation shouldnt take too long. what do you have to lose? you can always swap out turbos later if its not pushing enough power
I say go resonable at first, like a PT88 running a resonable boost. Then once you've got familier with driving the car, jump it up to a larger wheel. You wanna get comfortable with the car before you really push it to its limits!!
Go with the T6 housing up front with that many cubes and your goals. That will allow you to switch to something larger at a later date. The the T4 flange, you are already now at the max size turbo you can go. So if it isn't fast enough you are left with re-engineering the kit. We have a customer that did go 156mph with a 6spd LT1 car. That is the most I have seen with a PT88 in an F-body.
SSU Moderator
Joined: Nov 2001
Posts: 4,857
Likes: 0
From: Austin, TX
Originally Posted by BLk01SS
I say go resonable at first, like a PT88 running a resonable boost. Then once you've got familier with driving the car, jump it up to a larger wheel. You wanna get comfortable with the car before you really push it to its limits!!
Now, if he were to go with a large frame T6 he could interchange wheels, housings, etc. to find a good combo for the car.
EDIT: Damn, Jose beat me to it.
Last edited by RyanJ; Mar 8, 2006 at 10:42 AM. Reason: too slow