User 52121

So I've heard compelling arguments from both sides. What say you?

I suppose the question could apply to either front OR rear but in my case, I'm curious about rears - especially given the tendency to cook rear brakes on these cars.

Are you running the factory backing plates, or did you remove them?

One side says: need as much airflow to the rotor as possible

The other side says: the sensors and wiring in/near the spindle will cook without the plate there to deflect the heat

Thoughts?

My car does NOT have them on the rears right now (I do have them on the front.) Car came (to me) that way. I'm leaning towards finding a set and reinstalling as I tend to trust the opinion of "the other side" above a little more.

HoBoJoe

Jim, I can't help with your specific question but make sure you grab a set of GT3 front brake ducts and 997 Turbo rear ducts from your local dealer. The 997 turbo ducts will need modification to fit.

User 52121

Yup ahead of you there. Suncoast (or Sunset?) had the GT3 front ducts for *under* $4/ea. The 997TT rears were ~$20/ea.

Installed those 2 weekends ago.

jscott82

Interested to see where this goes... I may be starting down the SPC slope this winter...

For the 993 there was a factory solution to cut the plates down to the bare min.
https://rennlist.com/forums/showthre...ferrerid=45114

User 52121

Innnnnnnnteresting. Good find!

multi21

do you happen to have the part #s to these? I tried both sun coast and sunset Porsche, but didn't come up. Thanks.

Bill Lehman

If permitted, ditch the front brake shield and add the Olsen Motorsports brake ducts. Here's some pics of the TT modded rear brake ducts.

certz

jscott - let me or Matt Distephano (RL - jdistefa) know if you decide to build/buy an SPC. We have an email thread going of most of the SPC drivers so we can ask questions, etc. The SPC group is very supportive and helpful with setup, build and anything else you might need.

The OP already knows my thoughts and I had big problems with overheating of the rear brakes at Road America - I am trying a couple of things for the next race, but always interested in others thoughts. The Interseries cars had a solution, I have seen the turbo duct solution Bill has posted and I have installed modified GT4 rear ducts to try at my next race (I also have the Tim Olsen front ducts).

nxfedlt1

remove the backing plates.

Olson has a great set up for the fronts, and thanks for info on the TT ducts for the rear!

dgmark

Modified GT4 duct

User 52121

$17.96/ea:
997-331-487-02
997-331-488-02

$3.57/ea:
997-341-484-92
997-341-483-92

Via Sunset.

User 52121

I think Mark's solution is going to be the most effective. 1st we know the factory feels it's good (on the 981 platform anyways). 2nd, looking at how the ducts line up, they'll be pulling the air that exits the undertrays. Should flow plenty.

Pricing is steep compared to the TT ducts though. Not *awful* but not under 20 bucks either. I may see how things fare on my car with the TT ducts after I fix the PSM intervention first, see if I still get a cooked rear brake issue, before spending the money on the GT4 option.

I'll also be listening closely to John's feedback (owner of the car Mark posted pictures of) to see if his braking problems were completely resolved, better, just OK, etc.

As for the backing plates themselves... seems we still haven't found much in the way of a consensus.

User 52121

Those are different from the TT ducts I have.

Yours must be 996TT, I'm pretty certain the ones I bought are 997TT.

dgmark

I'm betting in them melting and catching on fire.

User 52121

In4video.