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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 02-10-2008, 08:15 AM   #1
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Tyre size???

I need to replace my stock 215/45/17 tyres on my Viggen. Should i go for 225/45/17 or even 235/45/17? Will a slightly wider tire help with grip on pull off and/or will it slow it down on top end, or should i stick with what Saab originally thinks are best?
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Old 02-10-2008, 08:38 AM   #2
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The wider the tire, the more grip as your increasing the contact patch. However, you may have an issue getting the tire to clear the strut going over bumps. I attempted to fit 225 series tires on my 9-3 but it would hit the strut. But if it will clear, wider is better.
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Old 02-10-2008, 09:21 AM   #3
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225/45/17 lock the thread.
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Old 02-10-2008, 08:44 PM   #4
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225/45/17 lock the thread.
Cool thanks guys.
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Old 02-15-2008, 08:55 PM   #5
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Just put on new Yokohama 225/45/17. Cant beleive the difference in traction. Much less wheelspin from pull off and hardly any wheelspin in 2nd. I wonder if the Dunlop SP 7000 d in 215/45/17 were just bad? Cant wait to do some V box tests and see the difference
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Old 02-15-2008, 10:08 PM   #6
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Quote:
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Much less wheelspin from pull off and hardly any wheelspin in 2nd.


Better get an ECU tune, ASAP.

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Old 02-15-2008, 10:55 PM   #7
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I didn't like the Dunlops that came with my Viggen in 215/45/17 but they were old so I couldn't get a fair comparison. I think the model was SP 9000 but I can't remember 100%.
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Old 02-16-2008, 06:01 AM   #8
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Better get an ECU tune, ASAP.

I will do. Got a tuner friend who has software and is going to do a custom tune for me. Thanks.
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