Basic Mazdaspeed 3 AutoX Questions - Mazda3 Forums : The #1 Mazda 3 Forum
 
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post #1 of 10 (permalink) Old 03-25-2011, 09:09 PM Thread Starter
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Basic Mazdaspeed 3 AutoX Questions

I have two basic questions for you guys. First, what do you run for tire pressure (i am on stock tires)? Secondly, how much fuel should I have in the tank? I know less is lighter, but I don't want to run into fuel pick-up issues either. Let me know what you think is best.
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post #2 of 10 (permalink) Old 03-25-2011, 09:35 PM
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Re: Basic Mazdaspeed 3 AutoX Questions

I often start events with about 3 gallons in the tank (light is just about to or just has come on) and run into no starvation issues. Have to think that the same would be true for a MS3.

That being said. No fuel = lean = real bad for a turbo.



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post #3 of 10 (permalink) Old 03-25-2011, 09:56 PM
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Re: Basic Mazdaspeed 3 AutoX Questions

Same here, I run with the low fuel light on often and have never encountered a fuel starvation issue. If you want to be safe, 3-5 gallons should be plenty. Tire pressure wise, a good starting point would be 40 lbs all the way around. Mark your tires with chalk and adjust from there.
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post #4 of 10 (permalink) Old 03-26-2011, 06:57 PM
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Re: Basic Mazdaspeed 3 AutoX Questions

As far as tire pressures are concerned, with the MS3 you will want to find the minimum front tire pressure that doesn't result in any sidewall roll-over (mark with chalk like Adam3s stated). Match the rear pressures to this front pressure you find and adjust the rear (up for a little more oversteer, down for a little more understeer) from there.


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post #5 of 10 (permalink) Old 03-26-2011, 08:28 PM Thread Starter
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Re: Basic Mazdaspeed 3 AutoX Questions

Thanks everybody; very much appreciated.
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post #6 of 10 (permalink) Old 05-23-2011, 01:04 PM
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Re: Basic Mazdaspeed 3 AutoX Questions

Two month old thread revival...

2011 Mazdaspeed 3 in D Stock on 7.5" rim. 225/40/18 or squeeze on the 245/35/18?

Jan G.
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post #7 of 10 (permalink) Old 05-23-2011, 02:44 PM
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Re: Basic Mazdaspeed 3 AutoX Questions

[quote author=Conechaser link=topic=188376.msg4030986#msg4030986 date=1306170246]
Two month old thread revival...

2011 Mazdaspeed 3 in D Stock on 7.5" rim. 225/40/18 or squeeze on the 245/30/18?
[/quote]

We run 275/35/18 Hoosiers on our 2011 Speed 3 in D-Stock:18x7.5, +50 offset, max front camber, 1/8" spacer front, and 1/16" spacer rear. A second choice (slower) would be Kumho V710 or Hoosier A6 in the 245/40/18.

If you're gonna run street tires in stock I'd stick to 225 or 235 on the stock wheels
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post #8 of 10 (permalink) Old 05-23-2011, 11:24 PM
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Re: Basic Mazdaspeed 3 AutoX Questions

[quote author=speed3chemist link=topic=188376.msg4031080#msg4031080 date=1306176271]
[quote author=Conechaser link=topic=188376.msg4030986#msg4030986 date=1306170246]
Two month old thread revival...

2011 Mazdaspeed 3 in D Stock on 7.5" rim. 225/40/18 or squeeze on the 245/30/18?
[/quote]

We run 275/35/18 Hoosiers on our 2011 Speed 3 in D-Stock:18x7.5, +50 offset, max front camber, 1/8" spacer front, and 1/16" spacer rear. A second choice (slower) would be Kumho V710 or Hoosier A6 in the 245/40/18.

If you're gonna run street tires in stock I'd stick to 225 or 235 on the stock wheels
[/quote]

Wow, that's a wide ass tire for a 7.5 rim. Your tire guy must love you. Any pics of how that looks on the rim? Do you need that spacer to clear anything or are you just maximizing your track?

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post #9 of 10 (permalink) Old 05-24-2011, 10:17 AM
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Re: Basic Mazdaspeed 3 AutoX Questions

[quote author=Conechaser link=topic=188376.msg4031564#msg4031564 date=1306207496]
Wow, that's a wide ass tire for a 7.5 rim. Your tire guy must love you. Any pics of how that looks on the rim? Do you need that spacer to clear anything or are you just maximizing your track?
[/quote]



They really aren't pinched that bad. Hoosier's have a lip that extends out over the rim and makes it farely easy to mount. I get them done at a local discount tire, and they don't complain at all. The first time I took them to get mounted they looked at me a little funny, but I assured them it had been done before.

The fit is tight, and the spacers are needed for clearance with the et50 wheel. In the front, the spacer is used to keep from rubbing the inside of the tire under full steering lock, and to keep the tire off the strut under lateral loads.

In the rear, the two sides are different on the speed3. The back inside of the passenger side has a plastic cover that the wheel rubs without the spacer. The drivers side doesn't have this cover and clears fine without the spacer. We originally ran 1/8" spacers both front and rear, but on lots with big bumps/elevation changes there was some minor rubbing on the rear fender. To fix this, we are going back to 1/16" spacers and will just let the tire rub lightly on that plastic cover until it fixes itself.

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post #10 of 10 (permalink) Old 06-24-2011, 09:13 AM
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Re: Basic Mazdaspeed 3 AutoX Questions

speed3chemist, you just answered a question i had for a while about 275's fitting, this will be my gameplan for next year!


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