Hi guys,

My modding saga since 10 years ago still continues, purely track focused performance on my mind.

Now went to Brembo GT 380mm kit (997TT version) and 19" due to brake size.

Rear tires are 305/30/19 Pirelli Trofeo R. The Pirelli Trofeo R is a "big" tire, as you sure know...wondering now if it's too big for my 996TT application?

Car has 997 GT2 RS IC's and Forge boost hoses with some sturdy clamps. KW Clubsport suspension.

Problem is the 305/30/19 Trofeo R hits the IC's boost hose clamp on driver's side. There is very little room! However, no problem on the passenger side. Can't solve this with spacer; has already aggressively spaced out wheels.

This is the driver side rear tire after only one easy test lap on Nordschleife:



What to do? It was years ago when the GT2 RS IC's were installed with original 997 GT2 IC brackets so should I re-install (and custom fit) these again? Change tyre type and size? Get some special custom 18" wheels for the brakes?

Very strange to see this problem, have seen guys running even bigger 325/30/19 in these cars around these forums...Thanks for any help.

 

When I had Garrett GT30's on the car, I had the compressor outlet sawed in two, rotated a bit and rewelded at a slightly different angle. that solved my problem. I was still able to make the stock hose fit properly. I also double clamped it.

 

Hey Kai,
Sorry I forgot to reply to your PM a couple of weeks ago. I just saw this. I am running a similar set up to yours. I have K16/GT2RS hybrid turbos along with stock hoses and 997.2ICs. I have never had any issues with stock hoses. They are actually quite good as they are a composite mesh encased with rubber. No problems running for 3 years with stock hoses at 1.3 bar with zero leaks at the connections when tested to 20+psi. I see no advantage going with silicone hoses except to line vendor's pockets (I've run Forge and AP silicone hoses and went to stock). I think the stock hoses a bit slimmer compared to Forge if I recall.

As far as wheels go, I am running 18x12 ET40 rears with 305/35/18 Nitto NT01 tires. These run very wide and have a large diameter of 26.42" (stock 315/30/18 GT2 sizes are 25.5" by comparison) which makes them almost a full 1" taller. I doubt the Trofeo's are any larger. I am also just a bit above Cup height with the rear at 124mm which translates to 119mm on the TT with the stock rubber subframe bushings. I have zero rubbing anywhere. My car has GT2 fender liners with the shorter GT2 attachment bracket which ties into the liner up on the side versus down by the IC hose as on the TT. This in itself gives you an extra 1/2" or so due to the lack of the bracket in that location. I suspect you have the stock TT brackets. A picture of the GT2 brackets is below. Also, are you running stock rubber thrust arm bushings and stock rubber ends in your rear LCAs? If so, you need to switch to mono ball ends and solid thrust arm bushings. These will eliminate any fore/aft movement of the rear wheels under load as there will be no rubber to compress. The stock bushings allow up to 1/4" or more of fore/aft movement under load and if you're clearances are tight you will have issues as you are finding out. What are your wheel offsets and are your rear fenders rolled? Hope this helps.

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