fc3sturboTT

i called precision today i was looking a the pt70 gt-s turbo the guy told me i should order the turbo with a P trim wheel insted of a Q or S with a .81 AR hot side
i was planning on getting a .96 Q or S trim but he said it wont spool up until 6k rmp
and was too large for a street/track car looking to make 500+hp
he told me to get the turbo in a P trim with a .81 dont you guys think that its to small for a ported FD motor

No_Rotor_RX7

if you go p-trim with the .81 you'll be fine. what kind of port job are we talking here? alot of people are stuck on the thought of NEEDING a huge a/r for the turbine. it does help on the top end but, realistically, what is your goal?

RacerXtreme7

iTrader: (2)

That turbo is SEVERLY oversized unless your building a pure drag race car. Don't confuss the PT70 with these MASTERPOWER T70 turbos (much smaller). The whole "t70" has gotten to be a buzz word. The PT70 has a MASSIVE 2.75" inducer, and going with a P trim and smallish .81 turbine really unbalances the turbo. I don't know your goals, unless your looking to make 600+ HP and spool around 4.7K~5.5k RPMS and drag race only, look for something a little more reasonable.

~Mike..........

hondahater

iTrader: (2)

The masterpower t70 is more like a t66 and from what I've heard the pt67 is a great turbo that works well with street and strip. RacerXtreme is right, that pt70 is a big *** turbo.

fc3sturboTT

my freind has ha the pt74 on his first gen and make 560hp on a t2 motor with 24pis with a q trim. .84 a/r
I have a 93 rew with a streetport looking for close too those number but dont want such a big turbo i like the t70 but not sure what trim to go with. What is the major difference with the S trim and the Q trim
i plan on running close to 30pis of boost
i see alot of guys have the greddy t78 on the street and have no problem so i dont think this turbo is too big

RacerXtreme7

iTrader: (2)

Again, your cross refferancing differant turbo manufactures and compairing which is NOT possible to do. The GReedy t78 inducer diameter is 2.5", a far cry from the massive inducer of the PT70. STOP looking at turbo NAMES and look at the internal parts or at least talk with/listen to turbo experts. GReedy T78, MASTERPOWER T70, Garrett or Garrett clones T70, Precision, etc etc all use differant ways to name there turbo's and this does NOT MEAN ONE IS "BIGGER" then the other by going on their numeric names.

If your buddy makes 560hp on a PT74 and the spool up is good enough for you, then by all means run the PT70 (WOW, LAG MACHINE, he must have a teeny tiny power band). I'd stick with a Q-trim and NOT a P-trim. A P-trim is too small for such a large compressor wheel and the tip speeds from one wheel to the other will be way off from one another. Get a Q-trim and run a divided manifold and .84 A/R turbine or if you dont have the money for a long tube divided manifold you can go with a .81 non divided turbine and non divded manifold. Keep in mind the non divided manifold will spool up slower AND make less power. You never stated you goals, were we (or I) could recommend a better suited turbo with quicker spool up and still meat your over power goals. Lastly, i don't know how informed or kowledgable you are, but you do realise that you wont beable to run anything more then 18 psi or so on pump gas and keep your engine together any length of time unless you run some type of auxillery water/meth injection or race gas right? And you realise the cost and HUGE amounts of modifacations to reach over the 400 rwhp mark right? just asking incase your clueless as to the money and effort your about to get *** deep in.

~Mike..............

No_Rotor_RX7

wow man... don't get over zealous yet. the MASTER POWER T70 is NOT a T66 or smaller. it has a 69.5mm inducer and a 92mm exducer. that sounds like a 70mm turbo to me... it's actually what i run.

you must be CONFUSING that with XS POWER which is a 61mm inducer

it is agreed tho that every company names their turbo's based on different measures. Greddy's T78 is a 66mm inducer wheel

greddy's T88 is a 70mm inducer wheel

the acceptance of lag is in the eye of the beholder

hondahater

iTrader: (2)

from what I've heard the t70 has a 2.720 (turbonetics t70) minor and a 3.584 (turbonetics t66) major and while yes the turbonetics t70 has the same minor as the masterpower, the turbonetics t66 major is 3.584 witch is the same as the masterpower t70.

Turblown

iTrader: (12)

Great advice, you've got to have a balance.

No_Rotor_RX7

i've got a t66 at work i'll measure it again, i don't remember what it's wheel is but damn that's a big ratio for the t66 either way... my point was the MPT70 is a true 70mm turbo.

bobybeach

Yes that’s rite. The Masterpower t-70 is still T-series wheel with 70mm inducer making it a t-70.
Actually I think its trim is a more desirable t-70 wheel for 13b application since its flow is huge and response is great. lets be realistic we will never see the boost levels that some of these larger T-series wheels have been designed for, there heavy trim design is wasted on street 13b application.

The small trim Masterpower GT45 uses a compressor wheel that is closer to the Turbonetics and Garrett T-70, and pt70 wheel