Yet Another DIY GTM TT Install

DIGItonium

Are you using the DXD organic or ceramic disk? I learned it the hard way when I called Joe after barely making it out of the hole at the strip. Clutch disk welded with the flywheel at launch. Joe says the disk can handle power, but not heat so it's not made for dragging. I have the full face ceramic. Joe didn't think it was good for daily driving, but this new disk is awesome! Engagements are smooth, and it doesn't slip. He says it handles over 700 lb-ft. O_O

I don't have pictures on hand, but the bearing has a larger flat surface so it seems to engage so much better than before. I don't have the nasty judder feeling either.

Just make sure to crack the hard line to the master to bleed bubbles first, close it up, then crack the CSC bleeder. I'd pump the pedal nearly 40 times, held down hard, crack the bleeder (feel pedal sinking further), close, lift pedal and repeat. Adjust stroke such that you have rougly 0.5" of play. Resistance should be firm and not as mushy. If you did it right, pedal feeling should be the same the next morning and after warming up.

Goodness this car is so much fun to drive now. There's no more gear notchiness either.

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valpozguy

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Dzel

So it welded itself cause it was organic am I following that right?

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10secWS6
IF YOU CAN'T SWING IT THEN DON'T BRING IT! Check out Domestic Performance C.C.

DIGItonium

Yea it's organic.

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Dzel

I need to start looking into clutches I have my heart set on a couple of turbo kits, but haven't even thought of a clutch and flywheel

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10secWS6
IF YOU CAN'T SWING IT THEN DON'T BRING IT! Check out Domestic Performance C.C.

esfourteen

Gauges and boost controller installed, this is temporary as I have a custom display/datalogger I'm working on. I apologize again in advance for the quality, I was in even more of a rush installing these as you can imagine.

Making a mount/bracket



Test fitting



Vacuum source for boost controller sender and map sensor



Mounting the boost controller solenoid to the back of the intake manifold


Routing the wiring through the firewall plug into the cabin



Test fitting the gauges


Cleaning up the wiring behind the stereo


Boost controller ECU


All done, and yes the cubby door closes!

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esfourteen

Just a small update on how the car is doing, so far no leaks, no rattles, drivability is perfect. No startup issues, no hesitation, AFR seems in check though may be a bit rich in some areas under WOT, I have sent a few logs for Sam to look over.

I hope you all like my dremel mod =]

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modme

Nicely done. Looks very clean, especially for a temporary setup. How many psi do you get on the waste gates with boost controller off?

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GTM Twin Turbo Stage 2|GTR Turbo/Engine Gauges|KW V3 Coilovers|HKS Exhaust|Oil Cooler| Vossen CV1

esfourteen

One thing I want to warn everyone about with the GTM kit and internal wastegates: If you want the option of running < 10psi and you aren't running a stock exhaust/cats, don't get them.

I made such a big deal about how theres no reason for externals and its a waste of money blah blah blah, now I feel like an idiot. Our engines flow a fuckton of air (technical term), the end result is that in 3rd-6th at 6k+ there is basically TOO much air flowing for the internal wastegate ports on the Garett turbos. I have the actuators at basically 0 preload, just enough tension on the flapper to keep them from rattling at idle, and I had boost creeping to 13psi at redline in higher gears.

You basically have 3 options for controlling boost creep when you have too much exhaust flow:

1.) run external wastegates, large wastegate opening flows more air, duh.
2.) port the internal wastegate housing, have to remove turbos
3.) restrict the exhaust flow (add backpressure)

I am working on option 3 right now, I have re-installed my old invidia gemini which is smaller diameter and more restrictive path than the aam 2.5". This reduced my creep from 13psi down to about 11psi, which is great but still not what I want. My next option is to either install high flow cats in place of test pipes, or install exhaust restrictors. An exhaust restrictor is basically just a metal plate you install in place of a gasket that has a smaller diameter opening.

If I was made aware of this issue when purchasing, which I wasn't, I would have gladly just went with external wastegates and recircd. I am not blaming GTM for this issue, but this is something they ABSOLUTELY should make clear when people purchase the internal wastegates.

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modme

I have heard of the boost creep problem with the stage 1. When I was ordering my kit, Sam recommended that I go with stage 2 due to the high exhaust volume of the vq37 engine. Any particular reason you went with stage 1? I would have expected Sam to warn you about this.

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GTM Twin Turbo Stage 2|GTR Turbo/Engine Gauges|KW V3 Coilovers|HKS Exhaust|Oil Cooler| Vossen CV1

esfourteen

Sam was surprised that he didn't warn me about it, but I can assure you as I did him, he said nothing. If he would have made even the slightest hint at boost creep I would have went external wg or stage 2 since the larger .86 AR helps mitigate this. My plan all along was to run no more than 8psi daily, and 10-12psi high boost with controller on.

Anyway whats done is done, I believe I can get down to 8-9psi max by adding a bit more back pressure. I just want everyone to be aware of the potential boost creep issues when making their decision.

Edit: I also want to point out that Sam even offered to swap exhaust housings for me to the .86 ar (stage 2) for free. I really appreciated this but after all the work I simply cannot pull these turbos off the car right now.

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Speedy

Very nice man. Glad to hear you're not having any issues. Seems a lot of folks have all kinds of problems after installing FI on these cars. Guess it's all in the tune or ?

esfourteen

Assuming you dont mess up the install, It's pretty much all about the tune. Sam has this nailed down.

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Greedy

I have the Stage 1 GTM TT and opted to go with external gates. I still get about 1 psi over the EBC setting, but does not creep above that. I set the lower setting to 6 psi and it gets me about 7-7.5 psi. High setting is at 10 psi and it ends up hitting 11-11.5 psi. This is with the gain set at 100 - If I turn down the gain, it gets even closer to the actual setting, but it loses alot of TQ early in the curve...

esfourteen

yeah the externals have a bigger path for the exhaust gasses to flow. what exhaust do you have? I would advise anyone going with stage 1 turbos to only get the external wastegates for better low boost control.

I'm looking to have a machine shop fabricate some exhaust restrictors instead of going with HFC, hopefully that will keep me under 9psi with the controller off.

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