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996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.
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The complete road racing thread, take your car to the track!

  #196  
Old 06-14-2016, 03:44 PM
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Originally Posted by Fadi View Post
even the 325/660/18 seems to be a front tire, will try the 680s and let you know
Yes, the 325/660 is a front tire also. I just meant to say if running the 660 I'd opt for the 325 over the 305 as it will handle a greater load.

Fadi, the biggest issue you will run into with running the 645/680s is ice mode. The diameter disparity between 245/645 and 305/680 is huge with the rear being 1.5" larger than the front. The stock street TT ABS unit on the other hand is programmed for a slightly smaller rear tire. Be very cautious when testing this and expect to loose brakes in bumpy areas of the track or when applying brakes hard and fast. Don't be surprised to get a rock hard pedal with no braking action and when you get it you will have to fully release and reapply in order to restore any braking.

This past weekend at the track, for time trials, a friend tried a set of Yoko 245/645 and 280/680 Cup slicks on his street 6GT3. These have the same diameters as the set up you want to run. Long story short, he ended up getting ice mode pretty bad resulting in a significant high speed off. Luckily no damage to the car besides a ripped off splitter.

When I ran 25.5/26.4 diameter tires with the stock ABS unit, I was on the very edge of getting into ice mode and had to back off in certain areas as a result of it. When I switched to the Cup ABS unit, all issues went away as the Cup unit is programmed for slicks and a +1" larger rear tire. I think the ABS will be the biggest challenge you will encounter with the 645/680s. The stock ABS unit is marginal to begin with and it's only aggravated when running slicks especially with grossly different tire diameters. Be careful and good luck.
 

Last edited by pwdrhound; 06-14-2016 at 03:57 PM.
  #197  
Old 06-14-2016, 03:55 PM
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Now it's clear.... wow....scary! I'm not going to try the 680s anymore, will list them for sale tonight, didnt know about the ice effect, thank you so much for this valuable info

Ordering 325/660/18 problem is the fronts are a bit used but guess even so it is better than running the taller ones

If you hear about somebody selling a cup ABS please let me know
 
  #198  
Old 06-14-2016, 04:08 PM
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Originally Posted by Fadi View Post
Now it's clear.... wow....scary! I'm not going to try the 680s anymore, will list them for sale tonight, didnt know about the ice effect, thank you so much for this valuable info

Ordering 325/660/18 problem is the fronts are a bit used but guess even so it is better than running the taller ones

If you hear about somebody selling a cup ABS please let me know
I think that's a smart move Fadi. I would start with a full fresh set but if it's the fronts that are used you'll be ok. Take it easy until you scrub in the rears.

Keep an eye out for the Cup ABS unit as they come up for sale occasionally. Keep checkin the Rennlist Cup car forum as they normally pop up there. Just last month I bought another Cup unit to have on the shelf as a spare. The ABS units rarely ever go bad but I wanted a spare just in case. They are worth their weight in gold as they are no longer made. The braking ability you get with the Cup ABS is astonishing, really a game changer. It's one of the best upgrades I ever did to the car from a performance standpoint. When they come up for sale they usually sell the very same day. You can expect to pay $4-5K for one. Make sure you get one with "Diagnosestand A02" programming as that was the last version. It's clearly marked on the front of the ABS unit and also comes up when you scan it with PST2/PIWIS.

[url=https://flic.kr/p/zZkB7H]
 

Last edited by pwdrhound; 06-15-2016 at 05:12 PM.
  #199  
Old 06-15-2016, 02:41 PM
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Thanks John, have ordered already the 325/660-18, seems there is new composition DHC but keeping also the old DH, went with the DHC as the vendor recommended
 
  #200  
Old 06-15-2016, 02:50 PM
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You will be fine with 660 or 640. I've run both, and had several discussion about them with Pirelli reps. The only time to give it a second thought is on banked tracks. Pirelli's are tough and you aren't likely to overload them with a street turbo. Never heard of the DHC compound though.
 
  #201  
Old 10-10-2016, 06:22 PM
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Originally Posted by rrertis View Post
We are doing a track event June 11-13 there for anyone that wants to come.

June of 2017?
 
  #202  
Old 12-24-2017, 03:51 PM
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Not sure if there's a better thread for these but here are a few videos from 09DEC17 at The Ridge in Shelton, WA. I have never been to this track before and was only my second "real" (not counting a small paved oval track I ran a handful of times) track day in this, or any, car. Probably a bit sloppy from time to time and I go off in one the second video and almost go off another time trying to squeeze a few extra mph out of the front straight! Highest speed I saw there was 150 mph. It was cold but it was a blast and got to meet and hang out with some cool people.



This last one is just a short clip I had someone record for me using my phone since I didn't have any external recordings of my car post exhaust install.
http://webm.land/media/45TL.webm
 
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