GTM Performance Engineering: GTM TD05 16G Test Results 91 Octane 7AT

Originally Posted by Mike@GTM

The HKS EVC 6 electronic boost controller can be programmed for per gear boost. That said, you can't run boost any lower than wastegate spring pressure. Most of our kits ship with 6psi springs, so that would be as low as you could go.

Also, I don't know if you knew this or not, but your right foot also functions as a manual boost controller that can change boost pressure on the fly.

Originally Posted by Mike@GTM

In the grand scheme of things, it would be ideal to do both the Twin Turbo and Transmission at the same time. Ultimately, it would save on transport costs and doing it all in one shot would allow you to truly enjoy the car from the get go.

In regards to the second half of your question, I personally feel like it's a really tough pill to swallow doing the transmission first and then doing the TT later as the performance gains from just a transmission build aren't exciting enough on their own to justify the cost. If it were me, I'd do the Twin Turbo, transmission cooler and tune to increase line pressure first, drive the car and enjoy it (within reason) while saving up for the transmission build.

Again, it's not truly necessary to build the transmission to have fun and enjoy the car. For example, I know that the transmission in my Subaru is made of glass and is ultimately a ticking time bomb...that didn't stop me from upgrading my turbo within reason and enjoying my car for what it is. I just take care of it and don't beat it like a drum...simple as that. I still track it occasionally and stomp on the go pedal when I feel like it, I just don't abuse it and change the fluid regularly. One other tidbit is that I do not take it to the drag strip because I know that all it takes is one bad launch to grenade that box into a trail of shrapnel. Know the limitations of your hardware and drive accordingly.

The bottom line is that if you are adamant about doubling your power and want to thrash the ever living $#!^ out of your car, then yeah, you ought to build the transmission to take the abuse.

Originally Posted by W.O.W. 370Z

Originally Posted by sloboi

Where is the intake situated?

Originally Posted by SAM@GTM

Originally Posted by Scribe

I'm super excited to see such a well matched kit for the stock VQ37 and happy that GTM didn't nerf the results in order to prevent cannibalization of their larger turbo kit. I was also concerned by the idea of cutting costs, but GTM have shown they don't cut corners and it is encouraging to see the results.

Some smaller turbo or supercharger kits exclude blowoff valves. Running 10 psi I'm happy to see they are present. But that leads me to ask about running 10 psi on the stock rods, especially on 91 which detonates almost as soon as you put it in your gas tank.

Some people seem to be finding the upper limit of these rods to be around 550whp and I would have concerns about longevity. Are there any concerns from you guys at GTM? I live the in the land of 93, and probably wouldn't want to run more than 9 psi, but could see an issue where people tune their cars to run 11-12 psi on 93 octane and then throw a rod through the side of their block.

Originally Posted by F.I. Inc.

Yes, they are Tony approved! Frank, when I get around to it, I may put your pipes into production. We will call them, "The FP" option.
-Tony

Originally Posted by FPenvy

I'm interested in this too since I only have ran 93 octane through my car and plan on continuing to do that after I would do a TT kit

Originally Posted by Scribe

My comment below isn't directed at you specifically, but is more of a generalization.

Running 93 won't be an issue as long as you are willing to keep the boost down to safe levels. The advantage you will see with 93 octane is a safer margin against detonation which is well worth losing a few inches in the pissing contest of dyno numbers. Just because you can turn the boost way up doesn't mean it makes sense. That's why I dislike the larger turbo kits for an unmodified VQ37. I don't need a huge turbo since I can't push more than 550whp anyway. I'll take the quicker spool all day over bragging rights about how much power two giant turbos could make.

Now if you are looking to future-proof your build, buying the larger kit may make sense. I would still argue there's tons of usable power left on the table with these turbos if you threw in beefier rods and lowered the compression.

Originally Posted by F.I. Inc.

Yes, they are Tony approved! Frank, when I get around to it, I may put your pipes into production. We will call them, "The FP" option.
-Tony

Originally Posted by FPenvy

lots of good info i agree with what youre saying. the main problem i'm running into right now is not only comin up with the money for the TT kit but also the transmission upgrades since i would really like to be able to have a fully functioning car rather than losing the higher gears just for high HP numbers lol

this new kit is amazing though. lots of power in a small package.

Originally Posted by Scribe

Don't forget to factor in a very nice boost controller. Speaking of which, I don't remember seeing anything about whether this car had one or not. I'd be interested to see both the boost and afr overlays for the dyno pulls.

I know that turbos work off of the pressure differential between the exhaust manifold and exhaust and that the best exhaust for a turbo is no exhaust. Still I would like to see what high flow cats and a straight-through style exhaust can achieve.

I also am curious if there is a divider within the down-pipe to keep some separate of the exhaust from the internal wastegate.

Originally Posted by F.I. Inc.

Yes, they are Tony approved! Frank, when I get around to it, I may put your pipes into production. We will call them, "The FP" option.
-Tony

Originally Posted by XwChriswX

Will you see a performance loss from using the 2 coolers and the crash bar blocking them vs one single cooler without the crashbar as in the previous kit? Although I do really like the idea of retaining the crash bar for safety purposes.