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Old 01-10-2014, 01:57 PM   #1
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Stock boost and gear

What is the gear ratio and stock boost ?? Thanks for replies


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Old 01-10-2014, 02:29 PM   #2
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This is listed in the owners guide supplement. Peak boost is 19.5 PSIg at the SAE rated power with 21 PSIg on over boost.

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* SAE Certified Performance ratings are achieved with 19.5 psi, but up to 21 psi can be delivered to maximize power depending on fuel quality and atmospheric conditions.
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Item
Transmission GFT MMT6 6-speed manual with 240 mm clutch and dual mass flywheel
Gear ratios Final Drive
1st 3.231 4.063
2nd 1.952 4.063
3rd 1.321 4.063
4th 1.029 4.063
5th 1.129 2.955
6th 0.943 2.955
Reverse 4.600 2.955
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Last edited by suss6052; 01-10-2014 at 06:37 PM.
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Old 03-29-2015, 04:27 AM   #3
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mph for each gear? don't see it in the manual

also shouldn't the ratio keep going down for higher gears? how come it drops at 4th then go back up at 5th?
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Old 03-29-2015, 07:57 AM   #4
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Originally Posted by okaythen View Post
mph for each gear? don't see it in the manual

also shouldn't the ratio keep going down for higher gears? how come it drops at 4th then go back up at 5th?
It's still a lower over all gear ratio in 5th even though the gear is shorter due to the split final drive and the 2.955 final drive ratio as part of the three shaft design. Gears 1-4 are on a 4.063 final drive ratio.

1.029*4.063=4.180827
1.129*2.955=3.336195
Lower overall gear ratios are taller, but they didn't want there to be a huge gap in ratio by having fifth gear be below 2.955:1 of the final drive vs the 4.063:1 final drive in 4th.
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