So this has been discussed a few times, and when someone asks about weight reduction beyond the obvious specs/mods such as LWBs, radio delete, PCCBs, lithium battery, side muffler delete, lightweight wheels, driver weight loss, the answer is always, it's a waste of money and time to try to reduce any further weight in a 991 GT car.....

However in the 997 GT car forum this is being discussed and they've come up with several ideas that I wonder if they would apply to 991 GT cars. Interesting to read about the ideas from the 997 guys.
https://rennlist.com/forums/997-gt2-...ion-ideas.html

In particular, I'm wondering if the front and rear bumper mods are still worth it as the 991.2 GT car bumpers are made with a new particularly light compound?
I wonder if there might be a way to lighten a 991 GT car, that doesn't apply to a 997?

 

I think AP racing has these lightweight calipers they use with steel discs and it still saves quite a lot of weight. I wonder if that could be adapted to PCCBs? So if you had PCCB's you'd save 40 pounds, another 20 lbs on wheels, and another 15 or so from the calipers. That's 75 lbs of unsprung weight right there, should make a noticeable difference.

 

What are you trying to achieve? What's the goal or reason for trying to reduce weight?

 

ive removed around 108lbs so far. Mag wheels, street headers (no sides) and antigravity. If I continue to remove more I’d go in this order. Removal of sound deadening, RS hood (aesthetically looks good too) RS side and rear glass then speaker removal. The more RAW the better. It’s my favorite toy.




I love this. Helps zero. Does it matter? People like to mod their stuff. I transformed an aluminum frame specialized diverge comp large frame bike to 17lbs total (with tubes) which is insane. Nothing but carbon, ceramic, and Magnesium parts for no reason other than enjoying the hobby and working on the bike. It’s been collecting dust for a while now.

The next comments to follow will be people do it for attention. Never fails.

 

I was not familiar with this. Thank you!

That is exactly the kind of thing I was hoping to learn by starting this thread

 

Exactly my condition. Once a race bike mechanic, always a race bike mechanic. After the big gains, I started to work on the smaller ones. Replaced the rear seat delete shelf with a self-made cover of the transmission tunnel (-2.7 kg), swapped out all non-essential nuts and bolts in the interior with Aluminium/Titanium (-1.1 kg), removed cup holders and worked on the dash trim (-0.7 kg) and numerous other little things, 5 kg in total. And lots of fun, plus a growing appreciation of how weight-conscious a 991 is designed.
Next on my list - rear lid hinges (I have a touring), grilles (are made of steel, replace with Al or Ti), rear windows, should add up to another 5 kg. The kind of things that you do if you aren´t Robert Linton.
Car is at 3130 lbs/1420 kg with full 90l tank / euro legal exhaust. Looks stock. But, it´s getting harder and I´d gladly share ideas & experiences.

 

Here is an idea

 

Wheels and battery are the easiest no-downside weight loss items. By my calculations it's 78 pounds per 0.5 second at 2 minute track. So If you are very evenly matched with some track day buddies, it will make a difference.

 

Battery and wheels should be first and then maybe titanium or inconel exhaust. It sure would be nice if someone made a very light manual window set to get rid of the electric motors, that and the RS glass would help a lot and then you have the RS CF fenders and lighter front end material and then of course the crazy magnesium roof on the GT2 RS...$$$ Adding lightness is very expensive.

 

Ive got a mint RS rear window for sale if anyone wants it? Some weight savings right there.

 

That's amazing!

 

I don’t know if this would hold true for porsche, but on lotus the manual windows were slightly heavier than the power ones.

One not yet discussed is door panel delete. Porsche Motorsports sells CF inserts which I think are awesome (but spendy and you lose the door airbags) The other one is carpet delete. Again, motorsports has flat panels. I mean, do you really need an interior.

 

I went with a set of Forgeline CF201s, Dundon street headers and an Anigravity battery. Love the Forgelines and Dundon headers for obvious reasons. The battery is hidden so there's no obvious feel good connection. However, I offset that one with an increase in my icecream intake in the summer. Hopefully not getting to net zero on the battery.🤣

 

It does.

 

fill tires with helium