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post #1 of 9 (permalink) Old 08-10-2014, 08:55 PM Thread Starter
PZ
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Good news and bad news

Short story - I had an issue today and had to jump from my 1st gen 3 to a 2nd gen with the 2.0 SkyActiv.

The good news - hopped into the car and dropped 1.6 seconds (on a 30 second course) on my first run.

The bad news - see the good news.

The only real prep differences

My tires - 205-45R16 Toyo R1R (yes small, but they were free)

His Tires - 205-55R16 Bridgestone RE-11A - he also had a rear bar.

Thinking my 3 might be getting a little tired after 150K miles. :-(

2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
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post #2 of 9 (permalink) Old 08-10-2014, 09:21 PM
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Don't discount the difference in gearing as a result of the tires.

Also, I'd always heard the RE11 had more grip than the R1R's.

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post #3 of 9 (permalink) Old 08-11-2014, 08:02 AM Thread Starter
PZ
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Gearing had nothing to do with it. We were at a postage stamp lot. Mid second gear at best.

2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
Slow in - Fast out Fast in - out backwards
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post #4 of 9 (permalink) Old 08-11-2014, 09:46 AM
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That was a pretty crazy "getting used to a new car" run. What thoughts be brewing?

edit: I think he's on 12.5 lb wheels. It's a JBR bar, but not sure what setting. Pretty epic tripod-ing though.

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post #5 of 9 (permalink) Old 08-12-2014, 06:52 PM
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Gearing is a huge factor, but in this case I think it would have hurt you, not helped.
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post #6 of 9 (permalink) Old 08-12-2014, 08:22 PM Thread Starter
PZ
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Chris - wheel weights matter very little in autocross unless you are at the very pointy end of the stick on a National level.

Funny thing on the gearing. According to the speed calculators that i have found, at 4500 RPM (about top speed on course) he would only be going a half an MPH faster, so my much shorter tires made up for his shorter 2nd gear. Gearing was a wash.

2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
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post #7 of 9 (permalink) Old 08-12-2014, 08:59 PM
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Because weight... in total? Maybe?

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post #8 of 9 (permalink) Old 08-12-2014, 09:37 PM Thread Starter
PZ
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Curb weights are close, with my car being a little lighter. HP and Torque of the 2.0 Skyactiv and my 2.3 are similar too.

2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
Slow in - Fast out Fast in - out backwards
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post #9 of 9 (permalink) Old 08-12-2014, 11:31 PM
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The tires and big rear bad are easily worth the time. New tires vs old $hit tires is about 1.5-2.0 sec I have found at times. However, the 2.3L is a bit long in the tooth on technology.

IF I had to do a STF build car for autocross and daily use and get good mileage a skyactiv 2.0 would be up there. I'd also consider a 2.5 as well if there was a way to get it to not upshift to 3rd.

David Hedderick
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