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Thread: Proper Tire Pressure (Rossion)

  1. #1
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    Default Proper Tire Pressure (Rossion)

    So as some of you know i recently went auto-x'n in the Rossion for the first time. New track to me, new car to me.

    I took first place in class. I believe it was A-Mod. Which is like unlimited mod. Only one other guy was in the class. A hyabusa powered go-kart type thing.

    More notably i beat two Elises one S/Cd and a Nissan GTR. All veteran auto-xers and at their home tracks.

    They all loved the car. I got 5 runs and each run i shaved off 7 tenths to over a second off my lap times.


    Now onto the thread title.

    i havent checked the tire pressure since i picked the car up. The tires look properly filled. If anything they look to be at high pressure. However when i checked them i got a reading of:

    Front: 17
    &
    Rear:27

    Which doesnt sound to far off from what i spec my other toys for race conditions.

    Whats the majority on what pressures should be on the rossions for race days.
    --Rossion Q1 Porsche White

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    Although this may seem like a simple question, it is almost impossible to answer in a simple way. The tire pressures you need depend not only on the car (weight/weight distribution/stiffness/shock characteristics), the tarmac characteristics (rough/smooth), features of the course (tight/open), the ambient temp (hot/cold), and the tire (age/type/size) but also on your driving style. IOW, one driver's ideal set-up may be completely wrong for you.
    Really the only way to get an answer for you is for you to spend some time in your car on a skid pad with a tire pyrometer--and take a look at this:
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    Joel

    '67 Lotus Elan S3 DHC (owned since 1970)
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    That seems like too much differential front to rear.
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    What tires are you using?

    I would guess that 17 is way too low. I would run that on mutters in the snow but usually not that low on a road car on a road course.

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    I am running the Rossion on the track in the moring, 26 psi front and 29psi rear.
    Something Wicked This Way Comes....
    http://www.chasecam.com/
    http://www.theadrenalinegallery.com Caterham Dealer
    1991 turbo MR2. 2006 Exige SC. 2011 Caterham R400

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    Recommended differential front to rear is 10 lbs, as a starting point. The factory specs recommended for the 3R on street tires was 17/27 and the M400 on R compound I believe was 20/30.

    Other than that, it is what Joel said.

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    The Corsas on the M400 were recommended 22/32, seemed to work pretty well. Would agree that 17/27 sounds a little low but all depends on how much they were ballooning up, what pressures were you were running hot?

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    I've found that recommended 10 lbs difference to be too much and leads to front end push. With the Goodyears that came on the car, I think something like 26F/30R is a better balance.

    By the way, the Nobles and Rossions are classed as XP in SCCA autocross.
    RUS0010

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    Ronnie it was a indy's first event classified as "Fun Run".

    Not to mention none of them had any clue what the car was. lol

    When i asked them what class this was the convo:

    "I need to know what class my car needs to be in"

    "Oh what is it"

    "A rossion Q1"

    "what"

    "Rossion"

    ...He starts paging through his book

    "Its not going to be in the book" lol

    "Oh well A-Mod then"

    "Thanks"
    --Rossion Q1 Porsche White

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    Quote Originally Posted by bgwilly31 View Post
    Ronnie it was a indy's first event classified as "Fun Run".

    Not to mention none of them had any clue what the car was. lol

    When i asked them what class this was the convo:

    "I need to know what class my car needs to be in"

    "Oh what is it"

    "A rossion Q1"

    "what"

    "Rossion"

    ...He starts paging through his book

    "Its not going to be in the book" lol

    "Oh well A-Mod then"

    "Thanks"
    Hilarious.
    Glad you did so well.

    I had these made up for this year before blowing my ankle out.
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    Last edited by slaughtr; 04-23-2010 at 09:11 AM.
    RUS0010

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