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Old 02-28-2006, 06:39 PM   #1
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Autocross settings

Need some help from the autocross crew. I have just installed my KYB AGX shock in the rear and will have my Kumho VictoRacer V700's mounted on Thursday (remounted) and need imput as to shock settings and air pressure. I have Koni's in front from last year and I ran them at full firm settings and they really kept body roll to a minimum. I tried going at 1/2 setting to see the difference and almost blew a turn because I tried to take it the same way I did at full firm setting.

So, do I max out the rear shocks also? Or do I need them to be softer than the front for better rotation?

TireRack lists the max pressure on the V700's at 44psi which is about what I was running on my Nitto's but the V700's should have a much stiffer sidewall and shouldn't need as much psi to keep from rolling onto the shoulder. What should I run them at?

Thanks for any imput


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Old 02-28-2006, 07:57 PM   #2
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All I can say is the Shock/Strut settings may differ for each event. Start in the middle and tune from there to see what feels good. From the sounds of it you will want to go firmer than the middle setting. As for the tires, you will probably want to run 42-44 psi up front and arount 36-38 psi in the rear.
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Old 02-28-2006, 08:56 PM   #3
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I know on slicks you run a lower PSI than you do on street tires - I think around 35 PSI. By how much, I do not know. Just put them fairly high around 40 PSI, and you might ask Pat or some of the other people what they'd suggest (you might even post it on the OK SCCA forum). However, I'm sure someone will have a good answer for you soon enough.

I would imagine you would want a firmer setting in the rear to induce more rotation, and you might have to soften up the Konis in the front. I really don't know how the KYBs compare in terms of bound/rebound rates compared to the Konis, but I would imagine the Konis are naturally stiffer. I would start out with the front at the setting you prefer and run the rears around 6 or 7 for starters (if you're running the Konis higher). However, it might take more than one event for you to find what you like by differing the air pressure in the tires and adjusting the damper settings.

What sort of driving dynamics are you looking for?
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Old 02-28-2006, 10:28 PM   #4
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I ran 2/4 front and 7/8 rear on my KYB's w/ stock springs and no rear swaybar. 42psi front, 35psi rear on crummy street tires.... the rear end was plenty loose. It was fun, but all that sliding around slowed me down.
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Old 03-01-2006, 08:13 AM   #5
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Increasing firmness increases traction, as you are keeping the bodyroll in check and making the best use of the front tires traction. Most people I know go roughly full stiff up front, half in the rear.

I would start out full stiff on the front, half at the rear, 42/38 in the tires. Just start with that baseline and tune from there. If someone has one of those handy little spike pyrometers (sticks a small needle into the tread to get a really good temp reading) use it on the outside/middle/inside of each tire and keep track as you go, adjusting till the outside is just a bit hotter. Without one of those, the shoe polish trick still works!

If your region has a test 'n tune, that'd be the perfect time to play with you damper settings...
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Old 03-01-2006, 01:35 PM   #6
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No test and tune here. Sunday March 5th is the 1st event of the season and it is a points event. I guess that will have to do for tuning. I know a couple of the guys have pyrometers so hopefully I can borrow one, but I also have the handy shoe polish in my kit box.

Thanks for all the help.
Can't wait till Sunday!!!!
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Old 03-01-2006, 04:28 PM   #7
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^^good luck & don't forget to get us some pic.s or vid. when you get back from the event!
I like to run fr 41 & rear 36 , but some of that depends on your driving style too!
I haven't run adjustable struts or shocks YET have fun & let us know how ya do
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Old 03-01-2006, 09:34 PM   #8
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I hope there will be a dedicated photographer there. They usually have one and the pics are outstanding. If not ilcowil will take some killer shots. He says he is not a profi but he sure takes Joe Photographer pics.

Either way, I will post em and HAVE A BLAST !!!!!!
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Old 03-01-2006, 11:20 PM   #9
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Without a telephoto lens, I wouldn't get your hopes up on the pictures. I'm sure there will be one photographer out there. My girlfriend is coming, and she'll be practicing on shooting, but I can make no promises on the outcome of the pictures. Anywhoo... all this photography pressure... this must be how Sean feels.
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Old 03-02-2006, 03:10 PM   #10
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^^^ LOL ^^^

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