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PostPosted: Mon Jul 14, 2014 4:57 am 
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I have a 1998 BMW 328is. The car comes with a 2.93 open diff. If I swap in a stock M3 3.23 LSD I obviously need to add +3 points for "added LSD", do I also need to add +3 for final drive ratio modification?


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PostPosted: Tue Jul 15, 2014 6:46 am 
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Yes. And note it's +6 whether you swap in a junkyard 3.23LSD or a built 4.56 with a Quaife :wink:

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PostPosted: Tue Jul 15, 2014 6:59 am 
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Haha. Okay. Thanks for the quick reply!


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PostPosted: Tue Jul 15, 2014 7:51 am 
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Under Section I - No Points Modifications
D4 - Final Drive Ratio Modification

Changing from an open diff to an LSD would be +3.
Modifying an LSD ( like with more discs or different lock-up/ramp rate) would be +1.

If you're just doing a final drive ratio change then its free in TT!

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PostPosted: Tue Jul 15, 2014 8:01 am 
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But this is the NASA-X section, not TT, and final drive change is +3 :wink: http://www.nasaproracing.com/rules/nasa-x_classes.pdf see 1.3.C bottom of p14

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PostPosted: Tue Jul 15, 2014 8:02 am 
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DOAH!!!

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PostPosted: Tue Jul 15, 2014 8:09 am 
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Good to know. I was asking about NASA-x but will be doing TT as well.


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PostPosted: Tue Jul 15, 2014 8:12 am 
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No worries. The classing systems are very similar but not exactly the same. Main differences are that all NASA-X classing is "points for parts" based (no TT1-2-3 power to weight dyno stuff), and that a bunch of the no-points mods for TT and PT take points in NASA-X.

If you think of any other questions, fire away anytime, on here or to me privately, jfelton at drivenasa dot com . Also if you need any E36 specific suggestions or advice we have plenty of experience with those cars (and the NASA classing of 'em) around here.

Thanks & hope it helps,

Jon

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