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Will I have to shift into 5th?

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Old Oct 2, 2006 | 04:23 PM
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Default Will I have to shift into 5th?

I currently trap around 115 on street tires. After I have my 9" with 4.10s installed, will I have to shift into 5th gear at the end of the track? Assume stock tire size of 245/16/50. Thanks in advance.
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Old Oct 3, 2006 | 06:42 AM
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Anyone??
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Old Oct 3, 2006 | 08:25 AM
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Where is your rev limiter set? When I had 4:10's I didn't have to do it on motor, but I did on the kit. It was only because I was shifting the car at 6000. But your rev limiter will determine whether you shift to 5th or not.
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Old Oct 3, 2006 | 09:07 AM
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Plug in your tranny ratios and final drive ratio. This will give you an approximate on where you would be. IMO I think you are. I've seen alot of guys on her running 3.73's with 26" tire and 4.10's with a 28" -Mark

EDIT: Might help if I put the damn link.

http://www.et-studios.com/motorsports/gears/gears.html
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Old Oct 3, 2006 | 10:27 AM
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Mark,

My rev limiter is set at the factory rating of, I believe, 6200 rpm. I'm not sure what all my gear ratios are. I will look them up. Thanks for the link. Anyone else out there have an M6 with 4.10's??
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Old Oct 3, 2006 | 10:39 AM
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T56:

1st- 2.66
2nd- 1.78
3rd- 1.30
4th- 1.0
5th- .74
6th- .60

In 4th gear w/ 4.10's and a 26" tall tire the calculator shows a mph of:

7000- 131.18
6500- 121.18
6000- 112.44

So you are already trapping 114mph and depending on where your rpms are at when you pass the traps I think you're going to hit the limit with a 26" tall tire and 4.10's. -Mark
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Old Oct 3, 2006 | 02:59 PM
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Originally Posted by Bitemark46
T56:

1st- 2.66
2nd- 1.78
3rd- 1.30
4th- 1.0
5th- .74
6th- .60

In 4th gear w/ 4.10's and a 26" tall tire the calculator shows a mph of:

7000- 131.18
6500- 121.18
6000- 112.44

So you are already trapping 114mph and depending on where your rpms are at when you pass the traps I think you're going to hit the limit with a 26" tall tire and 4.10's. -Mark
Thanks Mark. I guess I will find out at the track.
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Old Oct 5, 2006 | 07:15 AM
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I've had two diff. m6 set ups

1st. car 26" tire 390 gear 6,700 rpm 131mph 4th gear
2nd car 27" tire 410 gear 6,700 rpm 128mph 4th gear

I think you'll be right on the edge, but that's where you'll want to be.
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I have 4.10s and shift at 112mph at 6k rpm. it'll be close but you should be fine. one way to find out
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Old Oct 8, 2006 | 09:33 AM
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Thanks for the replies guys.
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