Yessir, Dwain is building it for me. Hope to have it ready for our POC 2015 season which kicks off Feb 7 but you know how that goes...

 

"No cool suit or any of that girly stuff for the 30 minute sprint races I'll be competing."

LOL, classic!

Wish we could get away with that here in Oklahoma but some of our june/july/august races have 100F+ temps and its just miserable without one.

Awesome build, best of luck to you in 2015!

 

Very cool!

 

what are the advantages to running an rsr drive angle ? is the wheelbase changed? is the engine pushed forward ?

amazing build.

in for more pics and info.

 

Hi Steve,

We obviously strive for the best CG possible by lowering the car to the absolute minimum. This is a ground effects car with a flat floor front to back dumping into a massive rear diffuser. We want to control the air under the nose and block the air from spilling under the car on the sides…lowering helps in a big way. The RSR's use a shorter rear subframe by about 20mm which acts to further lower the car. For the correct geometry, you must also use the RSR uprights (and since you have those you also switch to the RSR brakes). The RSR's run way more rubber than the Cup Cups. The GT2 platform will not allow that size of wheel/tire without tubbing the rear (like they do on the RSR). So now we are running a much taller tire attached to a much lowered car. All good, but remember this is a road race weapon and the suspension must still work throughout it's designed travel. The half shafts need to ideally be at the center point of suspension travel both up and down. Make sense?

Wheelbase is the same. Engine not pushed forward.

John

 

do you find it difficult to design a "massive rear diffuser" with the 911's characteristic rear engine? I always thought that was the reason for the disproportionately huge rear wing elements on these cars when you compare it to say, a 458 challenge car, with only a small gurney flap on the rear deck and all the aero beneath the car. guess I need to google up some pictures of the bottom of an RSR!

 

Of course it's difficult - and expensive! We have no rules to follow in GT1 (no aero restrictions, pesky hp to weight rules, etc.) As such our goal is to build a dominating car with lots of df. It will be closer to a DTM car than your normal 911. See pics below of diffuser mock up (rough and oversized in aluminum) and the the resulting mold ready to create the actual carbon center piece. There are also individual side sections that form a floor under the turbos. That's all I want to say at this point, as we are building this thing to win after all and I don't want to reveal ALL the secrets lol

 

thanks for the pictures! your secret is safe with me.

with the turbos to consider during placement, that thing looks like it sits LOW. A consumable item in the long run? ;-)

 

Consumable in the short run hence the mold process

 

Baby flames…for now

 

New (slightly larger) wing for the racer project. Bottom pic shows it relative to a stock GT3 RS wing.

 

Nice. Looks like a Getty wing with a 63" blade.

 

How much wider are the front fenders and any plans to produce more?

 

The shop sent me the pic of the wing, i have not measured it or know the width. It was made to the width of the rear fenders to allow us to tie the end plates into the diffuser (you thought I was joking about the DTM reference lol). I'm guessing it's more like 73-76". I'm traveling now but will find out when I stop by the shop when I get home. The car is up to 584 wheel at 1.2 and we they ran out of injector again (we are trying to preserve low and midrange hence the small injectors and gradual increase until we find the sweet spot). New injectors and more boost to finish the mapping.

The front wings are considerably wider than stock to run 11" fronts. We have tons of DF going on at the rear and must compensate up front with more grip to balance this thing out. Here are some pics of the front wings but not sure what the final width will be. I know there will be some big dive planes to make them even wider. We will pull molds off the wings to make sure we can replace as necessary. Probably would require a ton of modification to adapt to a street car.

 

How is the Infinity treating you on the dyno? You're one of the few I know running it right now but I believe that there are a bunch of others on the horizon and I'm interested in your experience so far!