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Installed the 997 GT3 82mm throttle body in my 3.6L tiptronic (original size is 74mm I believe).
Overall installation took longer than I anticipated as everything was tight. The silicone air pipe in the plenum kit I purchased did not fit very well and I had to trim it down quite a lot, and it touches the deck lid fan shroud and engine compartment light when the deck is closed (with a bit of force). The plenum itself fits perfectly to the engine, and the throttle body fits to it perfectly. If anyone is wondering, the part number for the 997 GT3 throttle body is 997-605-116-01 made by Bosch. The plenum kit is from a seller in the UK.
After everything was bolted in, started the car and the ECU took about a minute to adjust the idle, then I took it out for a drive. The torque has shifted lower in the rev range by 800-1000rpm or so, and the intake noise is much louder. My car has not been tuned or remapped (which many people recommend to do) but the performance gain is already very noticeable. The 1000-3000rpm range is much more usable now and I can be in one gear higher than before.
Below are some pictures. Please excuse the red tape on the oil filler tube as I broke it during the install process!
What wheels are these? Your car is absolutely stunning, I'm very interested in this upgrade, I imagine the extra torque is awesome.
They are Work Wheels from Japan, Brombacher/ VS/XX in step-lip configuration. F18x8 +47, R18x10 +60. I bought them in silver then painted them satin black.
And yes, that's an airbox off of a 997 3.6L engine.
Originally Posted by dan_189
Its a 997 air box rather than engine cover
To the OP, do you have any exhaust modifications? I have a standard IPD plenum but was looking into the 82mm version + TB
I have the Dansk Supersound mufflers and that's it. Definitely, do look into the IPD 82mm TB set up. I think the IPD plenum design has a lot of advantages over the original T-shape plenum (the one I have installed is also a T-shape pleunm). The extra volume of air makes a huge difference.
What is the OD of the new throttle body. Trying to determine what size silicone connection pipe I'll need to mate my Fabspeed intake to it when I do it.
What is the OD of the new throttle body. Trying to determine what size silicone connection pipe I'll need to mate my Fabspeed intake to it when I do it.
Thanks.
An 89mm silicone tube fits on the 82mm throttle body.
I used an 89mm to 85mm reducer I bought off Amazon when I had the K&N CAI. I have subsequently gone back to the original air box so I am using the silicone tube that came with the IPD competition plenum that has the same inner dimensions but connects to the air box similar to the OP above. No clearance issues on mine but it was a bit harder to install that the OEM rubber piece.
Fabspeed does make a kit https://flat6motorsports.com/collect...it-996-carrera that includes a silicone tube and a cap to seal the resonator hole in the air box (Helmholtz mod) but it is pricey at $245 and you can achieve the same thing much cheaper with the appropriate silicone tub and a cheap plastic cap (aka Orange Cap mod).
An 89mm silicone tube fits on the 82mm throttle body.
I used an 89mm to 85mm reducer I bought off Amazon when I had the K&N CAI. I have subsequently gone back to the original air box so I am using the silicone tube that came with the IPD competition plenum that has the same inner dimensions but connects to the air box similar to the OP above. No clearance issues on mine but it was a bit harder to install that the OEM rubber piece.
Fabspeed does make a kit https://flat6motorsports.com/collect...it-996-carrera that includes a silicone tube and a cap to seal the resonator hole in the air box (Helmholtz mod) but it is pricey at $245 and you can achieve the same thing much cheaper with the appropriate silicone tub and a cheap plastic cap (aka Orange Cap mod).
Bill
Sorry just realized you have the Fabspeed intake so there is this item:
Interesting results. I wouldn’t expect an increase in torque rather an increase in hp at the top end. What plenum did you use?
Thanks Bill. I actually hadn't thought this through. Because of my supercharger setup I have a custom pipe that runs from the back of the throttle body to the supercharger inlet. It looks like the bolt pattern on the 82mm throttle body is wider than on the standard one so I won't be able to use the larger throttle body since I can't change the intake pipe like you guys changed you're plenums.
So, saved myself a couple hundred bucks and not sure if itn would have had as much of an impact in a forced induction setup. Sometimes going larger reduces air velocity so total air mass through the system is less.
It was just something I was taking a look at, but not something I probably need to do.
10-11-2018, 04:35 AM
997 GT3 82mm Throttle Body Upgrade and Review
