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Discussion Starter · #1 ·
Just wanted to create a thread to discuss tire pressures as people seem to be all over the place and I can't imagine the there isn't a sweet spot.
 

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205/50-16

For my driving style, the pressures best for me are 40F/38R. I may bump the rears to 40 to see if I get more response for the smaller/tighter auto-x courses. So far, I have had better results in Sport mode and not OFF, but I am coming from an AWD WRX, so I'm still learning what I can and not do with FWD. My settings may change over time.

Lower than those and I roll onto the indicators. Much more than that and I don't get out to the edges
 

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Discussion Starter · #3 ·
225/45-16

Mine seemed to work well at 40/36 at the last event but I am not close to done testing. I also haven’t yet aligned the car and I’ve done nothing in the way of shocks or swaybars.
 

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205/50-16

For my driving style, the pressures best for me are 40F/38R. I may bump the rears to 40 to see if I get more response for the smaller/tighter auto-x courses. So far, I have had better results in Sport mode and not OFF, but I am coming from an AWD WRX, so I'm still learning what I can and not do with FWD. My settings may change over time.

Lower than those and I roll onto the indicators. Much more than that and I don't get out to the edges
Yesterday, I had my best run at 40f/40r on a small tight course. (Sport mode)
 

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Where I have settled after about 5-6 events in the FiST.

Fronts 225/45/16 ZII - 39-41 psi
Rears Stock tires - 55-58 psi

No rear bar, no shock upgrades, no alignment, just front tires and this happens:

 

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Ran 36 front and 34 ish rear yesterday in the rain with 40 degree temps. The car didn't push and it rotated very well. When it dried a bit the car was full of grip and was lifting the inside tire constantly. I myself only drove it in a downpour but it still had plenty of grip in the cold/wet.
 

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Ran 36 front and 34 ish rear yesterday in the rain with 40 degree temps. The car didn't push and it rotated very well. When it dried a bit the car was full of grip and was lifting the inside tire constantly. I myself only drove it in a downpour but it still had plenty of grip in the cold/wet.

Where are you located?

The Lincoln event was called at 10 AM Sunday d/t the extreme weather.
I cancelled Friday night because of the extreme weather, so no results from this weekend.

I won't be running on an all asphalt course until a double regional at Heartland Park July 13th.
That's where I think 36 psi fronts will work. Until then on airbase-type concrete, still need 40-42 psi fronts or it just grinds away the shoulders....
 

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Minnesota on all Asphalt. The car was used by two students/friends and I only got to drive it during instructor runs. Seriously these cars are very capable auto-x cars and I see them being very good at most events. The gearing though for Lincoln events may be a bit short
 

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I ran 36/32 when it was around 40 degrees on the first runs on Sunday and they were fine until it started to actually warm up . I bumped them up to 40/37 (same as Alan) and it rotated well, this was with ambient temps near 56


This picture was during the afternoon runs

 

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At my recent night autocross, I started out 40 front / 40 rear, and thought it felt a little sloppy.

42 up front was noticeably slower. Lots more wheelspin, probably due to a smaller contact patch.

So I went down to 38 and got my best time. Sloppiness did not increase.

Next time I will start at 37 /40 and try +/- 2 from there.
 

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Where I have settled after about 5-6 events in the FiST.

Fronts 225/45/16 ZII - 39-41 psi
Rears Stock tires - 55-58 psi
This is pretty much where I ended up as well. I usually start at 55 in the rear and have gone as high as 60 to encourage rotation. The 39-41 range on the front depends on grip levels and clockwise/counter-clockwise orientation of the course. The predominately outside front tire goes 40-41, with the inside at 39-40. Lower than that starts to create too much rollover, and too much more creates more wheelspin.
 
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