TT, or any Turbo and an Auto is actually a match made in heaven. Just ask the Buick Turbo Regal (Gran National) People. With an Auto, a Turbo can 1) Build boost off the line. 2) No letting off between shifts. Turbo never de-spools during shifts and boost is right there. 3) Less drive line shock, unless we are talking trans brake and AFIK, there is not one made for a G's auto yet. Turbo's and automatics tend to make more consistant ET's compared to a stick car. 4) Passing, from the milli second you start to open the throttle, the turbo is spooling, as the trans shifts down, watch out. It's not unheard of for Turbo Regals to be capable of inducing wheelspin on the OD (4th) to Direct (3rd) down shift.

I actually drive a 6mt G and love every minute of it and am dying to TT my G. But I have the utmost respect for turbo automatics, especially of the Black Regal type and a certan Chevy Monza on the side of my house with the heart of a Buick GN, 3.8 SFI Turbo.

Jay

 

Sorry my friend you couldn't be farther from the truth.

- You see more MTs with turbos because more MT drivers tend to be hard-core enthusiasts than AT drivers.
- SCs are FAR harder on the engine than TTs. Thisnk about it... you are boosting maybe 10% of the total time you drive your car on the street, and that's a liberal estimate. The entire time that you are cruising, you have a large tax on your crank from the supercharger, whereas the TTs do not tax the crank at all... they only slightly increase exhuat gas back pressure, that's all.
- and here is the most significant misleading statement...that SCs (and I am sure you mean screw-type like yours) make low end power whereas the TTs don't... The TTs make both for all intents and purposes. the stillen SC MAY (and I say MAY) make the more power (relative to what it makes through the powerband) about 300-600 rpm before than a TT, but compeltely lacks upper- midrange and top end. Also, we must be careful to compare apples-to-apples, the power that it does make down low is still 30-50 lb-ft of torque lower than a TT will ever make at the same boost setting.

Please do not get me wrong, I am not bad-mouthing Scs...they have their place. The only advantage of the system ON THE STREET is cost.... PERIOD! Any argument that an SC is preferred over a TT in anything other than cost is fairly anemic.

 

from what i've seen, my s/c puts out same 1/4 mile numbers as some of the 6mt tt. i'll be running high 12's with my torque converter and this is at 5psi. my car is an auto and it's 200 lbs heavier due to the awd system. so, for a few grand less i get about same setup as what tt guys get and i paid less money. i guess this is going off the subject, sorry.
i don't see how an auto trans is getting more abuse than a manual. with auto the pressure is constantly being released as opposed to a manual.

 

hard hard...
since none of us has TT AT G, one has to try
anyone wanna volunteer? hahaha

 

JDM - Just above your post, Gurgen HAS a 5AT sedan with a power enterprise twin turbo kit.

 

TT dominates over SC, but the cost...
here comes another question. which TT kit do you guys prefer for AT G coupe?
after looking over APS TT kit, i felt like 16 psi is bit small for our cars...
any suggestions along with how much psi is prefered?

 

What are you looking to achieve with a TT kit? Out of box, APS TT will not pass 12psi, without some modifications. Do you want out of box factory settings or plan for more power? If you want a safe kit with factory settings, go APS TT, SFR/SSR TT kit. Tinman and Kamal34 on this forum, both with 5AT and SFR TT kit, both with no problems over a year with that kit. IF you want more power and want tuneability with your TT, you should consider building-up your engine first, but consider SFR, Greddy, PE. Turbonetics ST or APS ST, are still testing on 5AT's.

 

yes, of course you have to rebuild the motor to handle more power.
i am looking forward to reach around 400~500HP, which means that i have to do internals. i am definately positive if i am going to do TT kit on my car, i would do motor/internals before the kit gets on my car. (definate, definately)
i think the hardest part of this is the tuning. (after money )
its not my daily-driving car since i have 2 other cars sitting outside of my garage. HOWEVER, i dont think that i can tune it every year due to its high HP. I am in middle of nowhere

i got another question, what do you mean by "safe kit?"

 

No doubt that's true, a well tuned twin turbocharged G35 car will eaily hose a SC G35 car that's for sure.

It's worth keeping mind that the amount of Mass air flow delivered at what boost pressure is what really counts, not just boost pressure.

Imho most guys will definitely struggle to keep a twin turbocharged auto G35 under control at just 8 to 9 PSI - I guess it all comes down to how well you can control a very fast cat.

Peter

 

sorry for my newbness.
i am learning everyday...from this forum and people like you
thank you thank you