I have them on 15x7 wheels. Now, I got another set for autocross weekends for the stock 15x6 wheels. Should I up the pressures? What pressures would you run?

Thanks,
-- NikkoTypeR (currently driving a 02 Civic Si)

 

You should really provide more info...Suspension setup, type of car... Start with 38 front and 33 rear. After your first run, take a look at the sidewalls and see if pressures need adjustment. If sidewalls are okay, make changes based on what you would like the car to do. Probably less understeer.

 

best method is to use the chalk/shoe polish on the sidewall and see if its rolling over. to start with, i'd try 36f/34r. this is on a 90 CRX, 22mm rear bar, 15x6.5 rims. these pressures are perfect for me (lots of testing, finally figured it out at the last event), but i'm thinking your pressures should be a bit higher with increased weight on that '02 Si. maybe try 38f/34-38r to control under/oversteer.

 

I've been running 38.5 front and now I'm down to 32 in the rear on my 96 DX. W/O a front bar and a 19mm in the rear makes things feel just fine and dandy.

 

If it were me, I'd autox with the 15x7 wheels and run the 15x6 on the street. Or at least compare them back-to-back and see what works better for competition.

I'm still playing with pressures on my 2000 Si with 15x7 wheels and 205/50/15 Azenis. Last event was 38f/32r cold, but I may go down to 30r next time to get a bit more rotation.

 

We found front tire pressures over 37 really seemed to make the front push too much. A 1 psi reduction in pressures (38-37) really made the car hook up in front and dramatically improved turn in which helped our times considerably.

Through testing on concrete and aspalt on 3 different R's at completely different ends of the mod spectrum (Todd00's fully modded R to my bone stock R) that 37 psi was the optimal pressure for the Azenis on all three cars on both surfaces.

Rears were another story and varied considerably depending on the car. Mine was as low as 24 psi to get the damn thing to turn enough, while Todd I *believe* ran near his front pressures with great results.

My advise is don't stray too far from the 37 mark up front, regardless of mods or wheel size and then adjust the rears to get the desired level of rotation.

 

??? Lower in the rear for more rotation??? I think you have that backward. Higher PSIs in the rear will increase your rotation of the back end. Try 38/36 and see what you think.

 

Not with azenis. All the testing we have done has shown that going down in pressure in the rear has increased rotation.

 

Yup same with me. I also noticed the less tread you have the more air pressure you have to add. I started out this year with 38f/35r with even temps across the front tires (meaning they were gripping).

Now with 41f/37r the car handles the same and temperatures across the tire (fronts) are even.

 

I've had the opposite reaction with mine. The lower I've gone in the rear has kept in check more then with higher PSIs. Above 34-35PSI in the rear and my back end just get real loose. Which car are you running that high on?? Maybe it's cause my DX doesn't have a front swaybar and it's pretty light??? Anyway it works for me and I'll be doing more of it this sunday!!!

 

That is what I usually run cold: 37-38 front, 32-35 back depending on track and weather. But those are my pressures for the 15x7 OZ Supperleggera wheels. I am thinking since stockers are 15x6 that I will have to run the pressure a little (1-2 PSI) higher (although I really do not want to go any higher in the front). Thus, maybe I will try 37f/35r and adjust ad hoc.

And, I wanted to stay in the stock class and not transition in the STS until I can afford a real compatative package. Off course, I should really be running R-compound tires since my competitors are, but I want to make that transition very smoothly. I autocrossed with Kumhos (712) and now I am already very happy with Azenis tires. Maybe a season from now I can debate whether to move to STS or get R tires. For now I want to get as much as possible from every autocross I go to and slowly start relying on feel rather than on the tire sounds. (I have driven a friend's VW with R tires and I realized I need to develop more of a feel for the car's balance and dynamics than to rely on tire sounds.) A former national chamipion told me once to leave my windows open during the runs to hear the tires; however, that practice got me overdependent on sounds. Lately, I have been driving more on the feel and have done much better.

Thanks for all your response. Also, thanks for not posting "yet another azenis quesiton" replies.

 

i dunno....you guys are getting drastically different PSI's in the rear than me....I usually run 39psi in the rear and 40-42 in the front...although lately I've been running more towards 38-40 in the front. higher psi's in the front have given up more rotation for me

 

On 6" wheel, I run 38psi front, 39-40psi rear (both cold measurements).

 

Yesterday and today I tried many pressures. I started with 38f/40r then dropped the rear to 30 and to 26. The best pressure for the rear was 30 PSI. I upped the front to 42 then to 45 and that was the best pressure up front.
Thus, the best pressures for my porky car were 45f/30r. The car felt MUCH better - no sidewall flex, even temps accross. My car is completely stock (not even an alignment) so these pressures will need to be adjusted once I put a little toe-out in front and some neg camber.