We here at TPC are big fans of GT3s... Sure, we add turbos to many cars(500hp Caymans), make huge power 911 Turbos that do 10s in the 1/4, and do all sorts of tweaks... But one thing always has us drooling... the 911 GT3. For some of you that may not know... Our #1 priority is race cars...

Here is a video of us winning the 24hr of Daytona in 2006(have the watch and trophy to prove it)

http://www.youtube.com/watch?v=MTF2H66v9UA

So that brings us to this... Bettering Street Cars. We do a lot of work with a company called JRZ, all of our cup cars feature JRZ suspension, we work directly with the Netherlands doing testing and design for their products, even help them shake out prototype pieces.

However... There are other ways to get a lot more performance out of your GT3 Street Car w/o switching out your factory PASM dampers. We put this system together...

TPC Racing GT2/3/RS Track Package



The system includes 2 Springs, Rear Toe Links and our Race Proven/Winning adjustable sway bars(bars work with all 997 variants(996 available also))

Here is a test drive and diagnosis of a 2010 997 GT3 RS that recently came in for work. It is a bit of a long video but sit back and relax, definitely some good info to take in! BTW, recommend switching up to watching it in 720p!

http://www.youtube.com/watch?v=3b6uzKsjUyY

 

Thanks for the video. I spoke with Tom Chan recently and he echoed Mike's remarks re; balancing front and rear grip. Looking forward to installing the TPC adjustable toe links and getting a baseline on the car at Mid Ohio. After that we will be back for linear rate front springs, front damper re-valving and front/rear bars.

 

You work with Fred right? Looking forward to you reporting back.

 

If you mean Fred Baker, I am a customer of Fred's. Kellen Miller is the Tech doing the install and set up. They recommended TPC to me and Kellen suggested I speak to Tom directly. Great advice BTW. Tom probably saved me a good deal of $$ and, more importantly, time and brain cells.

 

Sorry, that is what I meant. Mike and Fred go a long way back and I am excited that you are working with our products. Let us know if you have any other questions. We talk people out of modifications all the time. Better to spend money right the first time.

 

Casey, what is the rational behind Mike's choice of stiffer front springs than rears? He is the only person that I have heard of that takes this approach. Why?

 

The front springs are being uprated over where they are from the factory, however they are not exceeding the spring rate of the rear. He explains in the video why the rate of the front is raised.

 

OK, that must be for the RS, but I have talked to a few of his customers like Dr. John and Skip{996 GT3} who told me Mike installed stiffer front springs than rears. What about these?

 

OK, then let's talk Dr. John's car. He told me that you guys put stiffer springs in the front of his car than the rears. Why? I am not asking for your secret spring rates, just the rational for the stiffer fronts.

The reason I ask is I bought your front and rear sways and initially set them as per Mike's recommendation, front second hole from soft, rear full soft. My car was very unstable until I changed the rear to second hole from soft, now it is very stable. So front springs stiffer than the rear does not make sense to me after this experience.

Skip's last name is Close and he has a silver 996 GT3.

 

No doubt Dr. John is a very experienced driver, I'll ask him more about it. I personally would have to drive such a car to believe it.

 

So basically, under heavy braking the nose will not dive as it normally would.

Thanks for the video guys, very informative

 

Both Dive and Weight Transfer... That is a whole nother lesson.

 

Isn't dive caused by both the front braking power being more than the rear and the weight transfer?

 

Turn-in and mid-corner speed . So I assume then that this setup applies even more to the 997.1, since it has less front tire, and lower front spring rates than the 997.2 ??

I'm planning to buy a .1 GT3/RS and have been searching for someone to simply supply some linear rate ERS springs for the stock dampers, but can't seem to find any information on what size the stock springs actually are. Surely the stock springs are a normal diameter and length that could be easily replaced (i.e. 2.5" ID, 6", or 2.25" ID 5", etc. etc.). I'm suprised nobody does this, as this is the easiest way to increase performance, and limit dive and roll (along with bars) without spending a fortune on a new coilover setup.

 

I understand the difference between the functions of the anti roll bars and the springs. TPC's front roll bar is so much larger than stock or the TPC rear bar, I was thinking that the imbalance I felt with the recommended setting of a front bar stiffer bias, might in some way also relate to a front spring being stiffer than the rear spring. Since the front bar stiffer bias didn't work for me, I have to wonder if the front stiffer springs wouldn't work either. It seems counter intuitive with all the weight in the rear of the Porsche.