[AlanBDahl]

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.

 

[k757]

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

 

[AlanBDahl]

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.

 

[Mightymango]

I have mine set at 40/35 currently. Still testing.

 

[Mr UFO]

Fastest times for me have been at 36/32

 

[McRib 1s Back]

Fastest times for me have been at 36/32

Those are close to what works for me, hot. I aim to keep the front closer to 34 for road courses. Keep in mind that I'm running nearly -3 degrees of camber up front. If you can swing it, you gain good mechanical grip at lower pressures.

 

[k757]

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)

 

[Joshesh]

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:

 

[Mightymango]

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.

 

[Smokin]

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....

 

[Mightymango]

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

 

[AlanBDahl]

I ran my ZII's at 40/37 on asphalt in wet conditions yesterday and the car was fantastic.

 

[Mightymango]

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

 

[CrookedRacer]

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.

 

[conevadr]

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.