Track tire pressures for Yokohama tires - LotusTalk

kpbuck · 07-15-2009, 12:37 PM

OK - I am going to run my Exige (new to me) and now named the Skunk on the track at PBIR tomorrow night - expect the temperature to be in the mid eighties. I have no experience with the car or these tires. I typically run 30 & 36 on Hoosiers on my Porsche - then drop back 6 lbs after i get some temperature.... You guys got me into this - I am thinking the Skunk is going to be a lot of fun....

thanks!

khamai · 07-15-2009, 01:11 PM

26F / 28R per factory recommendations.

It's maybe difficult to believe that you'd go by what the factory says, but this IS Lotus... You have to put faith in what Roger Becker and friends say.

Have fun!!!!

Cheers,
Kiyoshi

kpbuck · 07-15-2009, 01:15 PM

Quote:

Originally Posted by khamai

26F / 28R per factory recommendations.

It's maybe difficult to believe that you'd go by what the factory says, but this IS Lotus... You have to put faith in what Roger Becker and friends say.

Have fun!!!!

Cheers,
Kiyoshi

Thanks Kiyoshi! Cold or warm?

JungleJim · 07-15-2009, 01:40 PM

Got a pic of the front view with your silver striped Skunk? My car's black too. PS. Nice car name. LOL

deddie · 07-15-2009, 01:44 PM

I run 28 front/29-30 rear (hot) and the grip is fine. A pyrometer is always your best friend for adjusting tire pressures at the track (as opposed to the yahoos on this board), but the baseline I provided should be in the ballpark. Have fun.

RichS · 07-15-2009, 01:48 PM

Cold.

That said, most of us who ran AO48s on the track actually reduced pressures below stock (24 front and 24 rear cold) after taking measurements with probe type pyrometers. The first lap or two is kind of squishy, but then the tires get up to temp and are perfect. If you run the car very hard (which will be a bit tough if you are just starting out with the car) and run stock pressure then you will find that the wheels will get a bit greasy towards the end of a 20+ minute session.

This depends GREATLY on how much you use the tires. If you are not right at the limit of adhesion in almost every corner then sticking with stock pressures is fine. If you are then I'd lower the cold temps a bit.

kpbuck · 07-15-2009, 03:22 PM

Quote:

Originally Posted by JungleJim

Got a pic of the front view with your silver striped Skunk? My car's black too. PS. Nice car name. LOL

here is a frontal shot of the Skunk

JungleJim · 07-15-2009, 03:57 PM

Thanks
Subtle and distinctive. Nice

kpbuck · 07-15-2009, 05:42 PM

Quote:

Originally Posted by RichS

Cold.

That said, most of us who ran AO48s on the track actually reduced pressures below stock (24 front and 24 rear cold) after taking measurements with probe type pyrometers. The first lap or two is kind of squishy, but then the tires get up to temp and are perfect. If you run the car very hard (which will be a bit tough if you are just starting out with the car) and run stock pressure then you will find that the wheels will get a bit greasy towards the end of a 20+ minute session.

This depends GREATLY on how much you use the tires. If you are not right at the limit of adhesion in almost every corner then sticking with stock pressures is fine. If you are then I'd lower the cold temps a bit.

thanks a lot! that is what I was looking for. Tomorrow is about getting to understand the dynamics of the car, I have been tracking 400 hp of Porsche carrying 3600 lbs around the corner so the pushing the Skunk around is going to be a serious adjustment... and max adhesion may be optimistic first track out.

Zinhead · 07-15-2009, 06:11 PM

Quote:

Originally Posted by kpbuck

here is a frontal shot of the Skunk

Reminds me of Pepe Le Pew. Try 24 front and 26 rear cold as a starting point. If you get some sliding on a hot day, lower them by 1 psi until they feel good.

deddie · 07-15-2009, 09:04 PM

Quote:

Originally Posted by kpbuck

thanks a lot! that is what I was looking for. Tomorrow is about getting to understand the dynamics of the car, I have been tracking 400 hp of Porsche carrying 3600 lbs around the corner so the pushing the Skunk around is going to be a serious adjustment... and max adhesion may be optimistic first track out.

I doubt that the Lotus will be a difficult adjustment. It is a very easy car to drive fast on the track.

Bad analogy: the Porsche you own is like a 1000cc sport bike and the Lotus is like a 600cc sport bike. If you can drive the 1000cc sport bike hard, the 600cc bike will feel like a toy.

brgelise · 07-16-2009, 08:02 AM

26/29 hot on the A048's has been the mantra for a few yrs now on stock rides. I agree with that completely. But, if you're running any additional negative camber, reduce the hot stagger to 2 pSI Try 27/29. Never let the rears be more than 30 hot as you'll just fry the centers (confirmed by pyrometer readings over 4 yrs) and get a loose ride. The rest is up to you. If its your first time at the track, you'll be safer with the hot pressures slightly lower than higher as the car becomes more of a handful with greasy tires. Ask me how i know!!

azmurciev12 · 07-16-2009, 07:01 PM

enjoy the car. but after your first track experience with the car. go get it to track specs height, remove the front shims, get a proper track alignment... there will be a big difference in the way the car behaves. i also suggest Manly's motor mounts together with the Shift Re-Inforcer. this is what i have on my car and it is just so much fun on the track.

07-15-2009, 12:37 PM	#1 (permalink)
kpbuck Registered User Join Date: Jul 2009 Location: Fort Lauderdale Posts: 62	Track tire pressures for Yokohama tires OK - I am going to run my Exige (new to me) and now named the Skunk on the track at PBIR tomorrow night - expect the temperature to be in the mid eighties. I have no experience with the car or these tires. I typically run 30 & 36 on Hoosiers on my Porsche - then drop back 6 lbs after i get some temperature.... You guys got me into this - I am thinking the Skunk is going to be a lot of fun.... thanks! Attached Images

07-15-2009, 01:11 PM	#2 (permalink)
khamai Plain ol' Lotus-nut Join Date: Aug 2003 Location: Nor Cal Posts: 3,562	26F / 28R per factory recommendations. It's maybe difficult to believe that you'd go by what the factory says, but this IS Lotus... You have to put faith in what Roger Becker and friends say. Have fun!!!! Cheers, Kiyoshi __________________ life is better behind the wheel of a Lotus...

07-15-2009, 01:40 PM	#4 (permalink)
JungleJim Left Lane Assasin Join Date: Apr 2009 Location: Norwalk, CT Posts: 121 Images: 12	Got a pic of the front view with your silver striped Skunk? My car's black too. PS. Nice car name. LOL __________________ 2007 Exige-All Black and Mean, Factory TouringPak/TrackPak/StarShield/LSD/TractionControl/iPodDock. All stock but not for long. v = square root ((2 * e) / m)

07-15-2009, 01:44 PM	#5 (permalink)
deddie Registered User Join Date: Jul 2004 Location: El Dorado Hills, CA Posts: 832	I run 28 front/29-30 rear (hot) and the grip is fine. A pyrometer is always your best friend for adjusting tire pressures at the track (as opposed to the yahoos on this board), but the baseline I provided should be in the ballpark. Have fun. __________________ 2007 Carrera S 2007 Exige S 2007 CBR600RR

07-15-2009, 01:48 PM	#6 (permalink)
RichS No, it's only an N/A Join Date: Jul 2005 Location: Austin, TX Posts: 3,285	Cold. That said, most of us who ran AO48s on the track actually reduced pressures below stock (24 front and 24 rear cold) after taking measurements with probe type pyrometers. The first lap or two is kind of squishy, but then the tires get up to temp and are perfect. If you run the car very hard (which will be a bit tough if you are just starting out with the car) and run stock pressure then you will find that the wheels will get a bit greasy towards the end of a 20+ minute session. This depends GREATLY on how much you use the tires. If you are not right at the limit of adhesion in almost every corner then sticking with stock pressures is fine. If you are then I'd lower the cold temps a bit. __________________ Useful links to vendors removed at Nadeem's request. "Nice avatar by the way, I doubt Colin Chapman would have followed the herd as I have seen many here do. --Nadeem"

07-15-2009, 03:57 PM	#8 (permalink)
JungleJim Left Lane Assasin Join Date: Apr 2009 Location: Norwalk, CT Posts: 121 Images: 12	Thanks Subtle and distinctive. Nice __________________ 2007 Exige-All Black and Mean, Factory TouringPak/TrackPak/StarShield/LSD/TractionControl/iPodDock. All stock but not for long. v = square root ((2 * e) / m)

07-16-2009, 08:02 AM	#12 (permalink)
brgelise Registered User Join Date: Sep 2005 Location: CT Posts: 346	26/29 hot on the A048's has been the mantra for a few yrs now on stock rides. I agree with that completely. But, if you're running any additional negative camber, reduce the hot stagger to 2 pSI Try 27/29. Never let the rears be more than 30 hot as you'll just fry the centers (confirmed by pyrometer readings over 4 yrs) and get a loose ride. The rest is up to you. If its your first time at the track, you'll be safer with the hot pressures slightly lower than higher as the car becomes more of a handful with greasy tires. Ask me how i know!! __________________ 05 Lotus Elise Sport Hardtop LRG red leather. 04 Skip Barber Race School, Competition certificate; 04 Jaguar XJ Vandan Plas Radiance Red Ivory leather 08 Isuzu Ascender Lux 08 BMW X5 3.0Si Monaco Blue, Sand Biege, loaded

07-16-2009, 07:01 PM	#13 (permalink)
azmurciev12 Registered User Join Date: Apr 2007 Posts: 117	enjoy the car. but after your first track experience with the car. go get it to track specs height, remove the front shims, get a proper track alignment... there will be a big difference in the way the car behaves. i also suggest Manly's motor mounts together with the Shift Re-Inforcer. this is what i have on my car and it is just so much fun on the track.

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