Earlierapex

Searched, no luck. What are the stock wheel sizes and offsets for a 997.1 GT3? How about max that will fit? I think i want 18s for a "softer" street setup. Thank you.

911SLOW

https://rennlist.com/forums/9157720-post6.html

997gt3north

Pilot Super Sports in 19s make a noticeable improvement - you might want to give this a try first - it was immediately noticeable to me.

Earlierapex

Thank you very much, but your answer is for an "rs" I believe? What are sizes and offsets for an 07 997.1 GT3 "regular?" It may be the same.

911SLOW

Sorry I missed the non RS part. Give me a minute.

911SLOW

12x19 ET68

8,5X19 ET53

997gt3north

12x9 is 68 but the 5mm spacer makes it a 63

Aerokitted

+1

Earlierapex

thanks guys. On the pilot super sports, are you saying they provide a softer ride for street tires? and 19s are fine?

chardonet

Yes, that is correct. Softer, and 19s are good. There is noticeable difference from SC's. I still prefer SC's for their lateral grip. A compromise.

997gt3north

a gt3 is not a caddy as we all know

the pss tires in 19s (235/305s or 245/305s) definitely change the feel of the car for daily driving

If the gt3 on a scale of 1-10 rides at 9/10, 10/10 would be the same car with 600/800 shocks & springs, then running pss tires brings it down to 8/10. You can feel it for sure when you first get into the car on the new tires and you will feel it for a few days. After that your butt will forget the OE tire feel and it will be what it is.

Earlierapex

Sorry, should have been more specific with background. It's a track setup car with JRZs and 1000lb springs with slicks, so it's pretty stiff...

I'd like a 70% track / 30% street compromise - probably 700/850 springs and medium tires. I'm sure the springs would make a BIG difference.

NJ-GT

1. Are you looking for a dedicated track tire (DOT-R no street legal) or a tire to use on street and track?

2. If the answer to (1) is street/track, are you willing to replace the street tires every 500 miles, every 2000 miles or every 5000 miles? the longer lasting street capable tires have lower grip at the track

997gt3north

I think basically it is your rebound that is required to prevent your car from pogo'ing that is 'your street problem'. You're driving down the street, and at any speed over 20mph, if your car hits a depression, the wheel can't drop down quickly enough to meet the road as your dampener is preventing your #1000 spring from expanding too quickly (as it is suppose to do) - and your tire thus slams into what ever it is going to hit and the car 'feels' brutally uncomfortable.

You have a few things you can do:
- when you leave the track you have to soften the rebound and compression and just live with a car that is bouncing around
- run PSS type tires and keep inflated at 29f, 33r

In all practical reality, if you want it for a daily as well, your springs are too high. Anything beyond the stock setup starts to really do well on the track but the the disadvantage on the street from a comfort perspective extracts a steep cost - but playing with rebound and compression.

600/700, 650/750, 600/800, 700/800 + the ability to soften rebound and compression would probably be the max 'stilll very streetable' setup that is possible and you are not lying to yourself.

I have 600/900 with revalved OE shocks. If I had a set of Ohlins on the car, I'm pretty sure I could set up the car with 650/750 + a set of PSS tires and most GT3 owners would not think it any different that a true OE setup while daily driving it.

You are looking for a free lunch and I don't think you are going to find it with 1000# springs - because if you soften the dampeners enough your car will be bouncing around like crazy and will feel terrible to drive.

Earlierapex

Thank you for all the help and feedback. I want to leave the car "mostly" track setup but marginally drivable on the street with a different set of wheels/tires. I think the 750/850 springs (I already have them, just not on the car) with some relatively softer street tires and loosened rebound/compression would work OK. Sounds like the stiff springs are the real culprit.