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Tire Pressures?

 
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MikesCoupeGT  



Joined: 18 Oct 2006
Posts: 469
Location: Ontario Canada

PostPosted: Thu Sep 12, 2019 3:25 am    Post subject: Tire Pressures? Reply with quote

Question for the hive mind.

I have been tracking and driving my little 924 for 8 years now. Aside from minor things the car has been a tank. Lots of fun, handles excellently and it always tends to draw a crowd.

Last week while getting the 944 finished up I noted the tire pressures for the 944 were listed at 29/36 front/back and this got me thinking about what I should be running on the 924.

The car is currently shod with 205/50/15 Dunlop Direzza's and I tend to run 32/30 front/back because there is more weight on the front. Am I wrong, or should I try the 944 pressures and see what happens?

Thanks
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CÚdric  



Joined: 27 Aug 2004
Posts: 2023
Location: Sweden

PostPosted: Thu Sep 12, 2019 6:49 am    Post subject: Reply with quote

Oem pressure isnt that interesting for track cars with track tyres. When i ran 205/50 r15 r compounds i found about 29psi/2bar hot pressure front and rear worked pretty well. But it depends on the tyre of course.
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Fasteddie313  



Joined: 29 Sep 2013
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Location: MI

PostPosted: Thu Sep 12, 2019 9:14 am    Post subject: Reply with quote

Could that tire pressure setup have been to correct understeer of staggered tire sized f/r of a 944?
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2053
Location: Somerset, UK

PostPosted: Thu Sep 12, 2019 9:24 pm    Post subject: Reply with quote

Mike, is the 32/30 hot or cold pressures?

Advice given to me about my R tyres was they should be circa 22 to 26 cold and not exceed 30 when hot on track. Most tend to set them equal as our cars a very balanced.

Road tyre pressures are completely different to track uses and R tyres. I don't run over 30 on road or R tyres on the road. But the 944 is a touch heavier than a 924. But still on track the 944 guys don't go over 30.

It depends on road whether you want the perfect blend of rolling resistance/gas mile, tyre wear and grip performance. Not all are aligned with one pressure. Its a compromise with manufacturers pressures ultimately trying to get the best gas mile and wear, not so much grip.
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924-76  



Joined: 05 Jun 2006
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Location: Ontario, Canada

PostPosted: Thu Sep 12, 2019 9:43 pm    Post subject: Reply with quote

If I remember correctly, I used to run 28 all around on this car with same tire size and type.
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MikesCoupeGT  



Joined: 18 Oct 2006
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Location: Ontario Canada

PostPosted: Thu Sep 12, 2019 11:20 pm    Post subject: Reply with quote

Carrera: the 32/30 is cold street pressure.

Tires that I am currently running are Dunlop Direzza's DZ102s. After a nut and bolt check last night everything is tight and ready to go. Tire Pressures are sitting around 30psi all around.

I will run the car like this for the lapping night. When I get some photos and video I will post up here. Should be a good time.
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Carrera RSR  



Joined: 08 Jan 2010
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Location: Somerset, UK

PostPosted: Fri Sep 13, 2019 12:12 am    Post subject: Reply with quote

MikesCoupeGT wrote:
Carrera: the 32/30 is cold street pressure.

Tires that I am currently running are Dunlop Direzza's DZ102s. After a nut and bolt check last night everything is tight and ready to go. Tire Pressures are sitting around 30psi all around.

I will run the car like this for the lapping night. When I get some photos and video I will post up here. Should be a good time.


Run them at 30 and see how you go. After some laps and you feel the tyre go a little greasy come in and check pressures asap. Could be up around 36-38 hot if running quickly and this could be too high for fast lapping. You will feel the grip fading away as the pressures go up and the road rubber gets too soft. I would let air out to be back at 30 hot.
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MikesCoupeGT  



Joined: 18 Oct 2006
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PostPosted: Fri Sep 13, 2019 11:48 pm    Post subject: Car is all set Reply with quote

So the car is all set for todays open lapping session at the 21 turn Calabogie Motorsports Park, here outside of Ottawa Canada. I have an extra set of brake pads coming, just to be safe, oil is good, tire pressures are set to 29psi and everything is working like it should.

Cannot wait to drive.
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HaroldG  



Joined: 16 Sep 2019
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PostPosted: Wed Sep 18, 2019 10:29 pm    Post subject: Reply with quote

How did the drive go, Mike? No need for the extra brake pads, I hope.
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safe  



Joined: 18 Mar 2017
Posts: 188
Location: Sweden

PostPosted: Thu Sep 19, 2019 12:37 am    Post subject: Re: Car is all set Reply with quote

MikesCoupeGT wrote:
So the car is all set for todays open lapping session at the 21 turn Calabogie Motorsports Park, here outside of Ottawa Canada. I have an extra set of brake pads coming, just to be safe, oil is good, tire pressures are set to 29psi and everything is working like it should.

Cannot wait to drive.


Dunlop Direzza is that the street or r-compound tire?

Setting the pressure at home, that is only good for the transport to the track. On the track you need to adjust accordingly.
If its the r-compound tire aim to keep the pressure 29-32 as a basis, if its the street tire try doing the same IF it has stiff sidewalls to cope with track driving otherwise 36-40 ish to not damage them.
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MikesCoupeGT  



Joined: 18 Oct 2006
Posts: 469
Location: Ontario Canada

PostPosted: Sat Sep 28, 2019 1:50 am    Post subject: Reply with quote

The Direzza is s a 200 tread wear street tire. They are old. I had a lot of push while running them a couple weeks ago. They may be dead. That said Pressures started at 29 all around and they performed adequately.

Biggest problem I had was my line and the battery not staying in one place. So it ended up being a troubleshooting night.

[img]<a data-flickr-embed="true" href="https://www.flickr.com/photos/93672870@N05/48803878391/in/dateposted-public/" title="Calabogie_2019"><img src="https://live.staticflickr.com/65535/48803878391_3aa0f883c1.jpg" width="500" height="333" alt="Calabogie_2019"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>[/img]

Quick sideline vid as well from Watkins Glen this past May.

[img]<a data-flickr-embed="true" href="https://www.flickr.com/photos/93672870@N05/48803529718/in/dateposted-public/" title="Exiting_Boot"><img src="https://live.staticflickr.com/31337/48803529718_d1f7433a5d.jpg" width="500" height="281" alt="Exiting_Boot"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>[/img]
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2053
Location: Somerset, UK

PostPosted: Sat Sep 28, 2019 2:52 am    Post subject: Reply with quote

MikesCoupeGT wrote:
The Direzza is s a 200 tread wear street tire. They are old. I had a lot of push while running them a couple weeks ago. They may be dead. That said Pressures started at 29 all around and they performed adequately.

Biggest problem I had was my line and the battery not staying in one place. So it ended up being a troubleshooting night.



Quick sideline vid as well from Watkins Glen this past May. https://www.flickr.com/photos/93672870@N05/48803529718/in/dateposted-public/


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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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924RACR  



Joined: 29 Jul 2001
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PostPosted: Sat Sep 28, 2019 10:17 pm    Post subject: Reply with quote

Ooof, she needs some springs/bars, get that puppy flatter around the corners!!
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MikesCoupeGT  



Joined: 18 Oct 2006
Posts: 469
Location: Ontario Canada

PostPosted: Mon Sep 30, 2019 10:56 pm    Post subject: Reply with quote

I would love to, but my efforts have been going towards getting my 944 running and driving this summer. I think the days of the 924 being tossed around the track are numbered.

It will be getting a mechanical and physical refresh in the near future. It deserves it after the 7 years I have owned. It.
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