My Road to 800HP with GT3076 Turbos - Story Starts
997 Turbo / GT22004–present Turbo discussion on the current model Porsche 911 Twin Turbo. Sponsored By SharkWerks, Inc
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My Road to 800HP with GT3076 Turbos - Story Starts
When we first got this 997 Turbo, we wanted to surpass the intensity and performance of our 996TT Project Car. Our goal was to step by step showcase what we could accomplish with a stock 997TT and the affects of each modification. Since the cars purchase in July 2008, we have documented everything from the coilover install, to the ECU flash, intake plenum test, HRE Wheels, and more. These have been documented on our Project 997TT Section Here.
Now it is time to show what the limit is of this engine as we take the car to 800HP. Besides being fast in a straight line, good handling, styling, and braking are key points in this project. The end result will be some independent track tests, drag times, 60-130, and video diaries of customer test drives.
Having fitted Garrett turbos to our 996TT, I was fully aware of what needed to be done on the 997TT but with changes for the larger GT3076 turbos. While trying to keep quality products, we also want to have a cost effective way to accomplish this goal. Learning from our 996TT project and mistakes, we were prepared to begin this journey.
Here are the parts that we currently have on the car:
JIC Exhaust
Agency Power Headers
Agency Power Carbon Fiber Cold Air Intake
Softronic ECU Flash
Car makes about 630awhp on pump. Runs 15psi and 18psi on sport mode.
Here is what we need to make this happen:
2 Garrett GT3076rs .63a/r Turbos
2 Tial 44mm External Wastegates
Headers to use the Garrett turbos
Intercoolers
Intercooler Piping
Boost Hoses
Upgraded Y-Pipe
New ECU Tune
Step 1
First step for us was to remove the stock bumper and remove the stock VTG turbos. To keep cost down we took our Agency Power GT Headers and added a T3/T4 flange to bolt the Garrett Turbo to it. Since we are running the external wastegates, we put a hole in the merge collector and fitted the Tial 44mm wastegate with V-band clamps. This is positioned to be level with the lowest point on the car and still have clearance by the sway bar bracket. There was no need for any fancy oil cans. To fit these, we drilled out the holes on the stock oil can which it fits up to the turbo fine including the oil breather hard line. We are still working on the waterline and top feed oil line. 1 part that we did want to retain was an adapter that fit the Garrett turbo so you could bolt a stock exhaust style flange to it. We retained this idea from our 996TT kit.
Not completed yet
Step 2
We are going to improve the cooling by upgrading the intercoolers. We decided to use our Agency Power intercoolers from the 996TT. The intercoolers are good to 800hp and about 40% larger then the stock ones. The orientation of the intercoolers is the same on the 996TT and 997TT. The ducting has to be modified slightly and we added a tab to secure it better. Once we cut up the ducting, the intercooler is positioned with double sided foam to keep the air flow sealed and we run those tie straps through the core that are used on radiators to keep it tight.
Step 3
Right now we are in the process of making the intercooler pipe that goes from the compressor side of the turbo to the intake. We are going to be retaining the OEM style boost hoses but we have upgraded them with our Agency Power silicone ones. The top YPipe will be recreated going with 3inch piping merging into the 4inch collector that goes to the throttle body. We are going to have this pipe built so we can keep our carbon air box setup.
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Here are the parts that we currently have on the car:
JIC Exhaust
Agency Power Headers
Agency Power Carbon Fiber Cold Air Intake
Softronic ECU Flash
Car makes about 630awhp on pump. Runs 15psi and 18psi on sport mode.
Just wanna make sure I'm reading this right. The car makes 630awhp, that's 630 hp to all wheels with those mods?
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Thank you Edwin. Right back at you. This thread will be updated each step of the way. Please ask any questions about the tuning or install...
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GT RUS - project is starting, so no dynos. 630 crank. so 520awhp.
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