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Why 18" vs 19" wheels/tire for track and Auto-X

Originally Posted by gomer_110 1. Better tire options for 18" wheels. 2. Weight reduction, although the wider wheels most of us run end up bringing the weight back up. 3.

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Why 18" vs 19" wheels/tire for track and Auto-X Why 18" vs 19" wheels/tire for track and Auto-X
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Old 08-26-2014, 12:59 PM   #1 (permalink)
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1. Better tire options for 18" wheels.
2. Weight reduction, although the wider wheels most of us run end up bringing the weight back up.
3. Rotational inertia is better on 18" wheels.
4. Even with 315/30-18's on my car I still redline around 67mph which is plenty for most courses to not need 3rd gear.
Nismo has same gearing as base w/sport? Also, is around 67mph captured with data or just your best SWAG?
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Old 08-26-2014, 02:39 PM   #2 (permalink)
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Nismo has same gearing as base w/sport? Also, is around 67mph captured with data or just your best SWAG?
GPS reading on data logger for speed capture. Also the gearing (both trans and diff) are the same between the Sport and Nismo.
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Old 08-26-2014, 03:43 PM   #3 (permalink)
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Nismo has same gearing as base w/sport? Also, is around 67mph captured with data or just your best SWAG?
My GPS data shows high 68ish MPH top end in 2nd. Captured using RaceTrace ;-)

The two runs displayed are my right side runs at the Crows Landing ProSolo: https://www.youtube.com/watch?v=NFEB...EGGtLCB9guMgJA
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Old 08-28-2014, 04:48 PM   #4 (permalink)
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My GPS data shows high 68ish MPH top end in 2nd. Captured using RaceTrace ;-)

The two runs displayed are my right side runs at the Crows Landing ProSolo: https://www.youtube.com/watch?v=NFEB...EGGtLCB9guMgJA
exactly what I was looking to satisfy my curiosity. Thanks! P.S. You ever heard or seen Petrel data logging software? It's basically THE data logger for Auto-Xer's I highly recommend you make the switch. The ability to instantly review a run definitely gives a competitive edge.
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Old 08-28-2014, 05:08 PM   #5 (permalink)
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exactly what I was looking to satisfy my curiosity. Thanks! P.S. You ever heard or seen Petrel data logging software? It's basically THE data logger for Auto-Xer's I highly recommend you make the switch. The ability to instantly review a run definitely gives a competitive edge.
I'm a developer for RaceTrace, and I'm pretty happy with the software I wrote myself

This screenshot is from my iPhone, and I regularly review data between runs when I'm autocrossing. Plus, the ability to compare my data to co-drivers' on the fly really helps to learn where we're gaining and losing time to each other.

There's a thread from a few weeks ago with some more info on the topic: Lap recording software.

Also, SoloStorm (The Petrel product) is $200 and Android only, RaceTrace is $15 and (currently) iPhone only.
Last edited by stuy486; 08-28-2014 at 05:11 PM.
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