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Board index » 1997-2008 Grand Prix Discussion » Tuning section

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gojo83
 Post subject: little tuning help
PostPosted: Fri Apr 04, 2008 11:17 am 
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I put on shorter tires because they were available and free but that throws my speedo off. I got to looking for an answer and here is the formula I used tell me if it makes sense.

stock short
225/60/16 225/50/16
rev per mile 781.3 837.0

vss pulse 23430 25100
per mile


variable 29.98

does that make logical sense or not? it does to me, I just wanna get the speedo as close to right as possible

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Blackwood
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PostPosted: Fri Apr 04, 2008 11:36 am 
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I came up with the same pulses


225/60/16 = 23430

225/50/16 = 25100

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'
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gojo83
 Post subject:
PostPosted: Fri Apr 04, 2008 11:58 am 
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cool that is kinda what i wanted to make sure my logic was right

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Blackwood
 Post subject:
PostPosted: Fri Apr 04, 2008 12:21 pm 
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gojo83 wrote:
cool that is kinda what i wanted to make sure my logic was right


I used the DHP Tire Size calculator

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gojo83
 Post subject:
PostPosted: Mon Apr 07, 2008 12:14 am 
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ran past a radar box today and it is only one mph off

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