08-07-2011, 06:17 AM
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#1
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Registered User
Join Date: Sep 2009
Location: The City
Posts: 1,084
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if u have transmission issues you could give these guys a call GBOX
I have never done business with them but i have talked to them before and are very helpful
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08-07-2011, 09:41 AM
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#2
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Registered User
Join Date: Aug 2009
Posts: 1,466
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no issues
I'm not having any problems with my transmission. I'm replacing my Clutch. pressure plate, and flywheel. I saw a coulpe good prices on 6 Speed. The 03 manuals say every gear is a higher ratio with less span between every gear, .62 span between 1-2 on the 5spd . 38 on the 6spd. , .69 span 2-3 on the 5Spd, .68 on the 6spd. The only down side I saw was top ratio .84 on the 5spd and .89 on the 6spd which means worse fuel economy. The number should produce a quick acceleration curve, minus shifting time.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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08-07-2011, 10:19 AM
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#3
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
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Originally Posted by jsceash
I'm not having any problems with my transmission. I'm replacing my Clutch. pressure plate, and flywheel. I saw a coulpe good prices on 6 Speed. The 03 manuals say every gear is a higher ratio with less span between every gear, .62 span between 1-2 on the 5spd . 38 on the 6spd. , .69 span 2-3 on the 5Spd, .68 on the 6spd. The only down side I saw was top ratio .84 on the 5spd and .89 on the 6spd which means worse fuel economy. The number should produce a quick acceleration curve, minus shifting time.
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Look at the final drive ratio too.
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08-07-2011, 10:26 AM
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#4
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Registered User
Join Date: Aug 2011
Location: USA
Posts: 414
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I have a Boxster S with the 6 speed, and I was thinking about going the other way and converting to the 5 speed for autocross - want to swap?
Actually, the final drive ratio on the 6 speed is ususally a handicap for most autoccross courses. It is numerically quite low, and so you give up some acceleration.
The 6 speed in 2 nd gear does not red line until about 74 MPH which is a rare top speed for autocross. For best acceleration, you would want red line to occur at a more normal 65 MPH or so maximum top speed for autocross.
__________________
Kippis
986S
991S
Van Diemen RF97
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08-07-2011, 03:37 PM
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#5
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Registered User
Join Date: Aug 2009
Posts: 1,466
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Is the actual ratio in any gear is the (transmission gear ratio X the final drive) or is it transmission divided by the rear ratio.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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08-08-2011, 08:03 AM
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#6
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Registered User
Join Date: Apr 2008
Location: Southern New jersey
Posts: 1,054
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You multiply, so a 2.95 first and a 4.10 rear give a total gear reduction of 12.095.
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