When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Will this rear diffuser change the aerodynamic balance of the car?Interested to see if more front downforce will be required?
The rear diffuser will create additional downforce which is the whole idea. Car set up may need to be changed to account for it, be it with a slight adjustment in rake or sway bar settings to simply adding a larger front Cup splitter. The chassis of the GT3 is adjustable so there are options to tweak the set up. The street car rear wing is smaller than a Cup wing so additional rear downforce is going to be beneficial.
How is the process going? Still another 30 days or so out? Any pics of the prototype yet?
Probably about the right timeframe. We have the diffuser base plate done and test fitted on the car and just waiting to get the fins machined. We have everything in CAD and I'll get some renderings posted up in the next day or two.
Here are the CAD renderings of the diffuser. The diffuser is designed to seamlessly integrate with the rear OEM triangle underbody panel. It has the correct cutouts to clear and integrate with the factory 997GT3 rear brake ducts. We have the base panel test fitted and are now simply waiting to machine the fins. Hopefully the prototype will be on the car in the next 30 days.
Last edited by powdrhound; 04-11-2024 at 01:13 AM.
Here are the CAD renderings of the diffuser. The diffuser is designed to seamlessly integrate with the rear OEM triangle underbody panel. It has the correct cutouts to clear and integrate with the factory 997GT3 rear brake ducts. We have the base panel test fitted and are now simply waiting to machine the fins. Hopefully the prototype will be on the car in the next 30 days.
Awesome, I assume this should work on either a .1 or a .2? I'm guessing the attachment points are the same on the underbody panels and the bumper?
The attachment point is via 2 bolts in the front part of the diffuser and 3 bolts in the rear. The two front bolts use the holes in the subframes (where ride height is measured) and in the rear there are 3 turnbuckles which attach to the existing bolt holes that affix the heat shield to the rear bumper crash brace. This will most likely only fit applications with a more compact center muffler (CMB) which does not hang below the back of the bumper. The factory center muffler is too bulky. Depending on overall rigidity, there may also be a small bracket that would attach the diffuser to the engine carrier itself in a similar fashion as used on the 997RSR.
unfortunately where I live, legislatively I need to keep the stock exhaust system… so this looks like a no go for me if it cannot be fitted to a car with the stock rear box.
Originally Posted by powdrhound
The attachment point is via 2 bolts in the front part of the diffuser and 3 bolts in the rear. The two front bolts use the holes in the subframes (where ride height is measured) and in the rear there are 3 turnbuckles which attach to the existing bolt holes that affix the heat shield to the rear bumper crash brace. This will most likely only fit applications with a more compact center muffler (CMB) which does not hang below the back of the bumper. The factory center muffler is too bulky. Depending on overall rigidity, there may also be a small bracket that would attach the diffuser to the engine carrier itself in a similar fashion as used on the 997RSR.
unfortunately where I live, legislatively I need to keep the stock exhaust system… so this looks like a no go for me if it cannot be fitted to a car with the stock rear box.
Yep. The stock muffler is too large and hangs a bit too low in my opinion. I will double check however. This diffuser is more appropriate for a track application where most will have a center muffler bypass already.
03-06-2024, 02:24 PM
