Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical Chat

Post Reply
 
LinkBack Thread Tools Display Modes
Old 04-19-2013, 05:54 AM   #1
Registered User
 
Join Date: Sep 2004
Location: Atlanta
Posts: 1,820
Quote:
Originally Posted by Joe B View Post
Thanks for the info. I always wondered what the difference in ratios was between the 6 speed I bought and a 5 speed. I like the fact that the 6 speed ratios are lower (higher numerically).
actually, they're not. you have to consider the final drive. the 6-speed FD is 3.44. the 2.5L is 3.889 and the 2.7L is 3.555. you need to multiply each geary by this number to get an EFFECTIVE gear ratio.

the truth is, the 2.5L has is geared lower than either of the others by a pretty substantial amount. the 2.7L, IMO, is the LEAST desirable. next is the 6-speed. the 2.5L 5-speed has the most useful ratios from a performance perspective.

__________________
insite
'99 Boxster
3.4L Conversion

http://i156.photobucket.com/albums/t...1/KMTGPR-1.jpg
insite is offline   Reply With Quote
Old 04-19-2013, 05:57 AM   #2
Registered User
 
Joe B's Avatar
 
Join Date: Dec 2012
Location: Jackson Hole, Wyoming
Posts: 800
Oh, right . Well at least 4th and 5th are lower, gears that I use a lot.
Joe B is offline   Reply With Quote
Old 09-24-2020, 10:03 AM   #3
2006 987
 
986_inquiry's Avatar
 
Join Date: Dec 2006
Location: st. louis
Posts: 443
Garage
Quote:
Originally Posted by insite View Post
actually, they're not. you have to consider the final drive. the 6-speed FD is 3.44. the 2.5L is 3.889 and the 2.7L is 3.555. you need to multiply each geary by this number to get an EFFECTIVE gear ratio.

the truth is, the 2.5L has is geared lower than either of the others by a pretty substantial amount. the 2.7L, IMO, is the LEAST desirable. next is the 6-speed. the 2.5L 5-speed has the most useful ratios from a performance perspective.

I was wondering why the 2.5 feels faster than the 2.7 despite the 2.7 having 10% more hp and 5% more torque. Gear ratio explains it.
__________________
2006 987 2.7 manual silver/black, PASM, OEM drilled rotors, heated seats
1998 986 2.5 manual black/tan with bad engine = SOLD
986_inquiry is offline   Reply With Quote
Old 09-24-2020, 12:21 PM   #4
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
Garage
Quote:
Originally Posted by 986_inquiry View Post
I was wondering why the 2.5 feels faster than the 2.7 despite the 2.7 having 10% more hp and 5% more torque. Gear ratio explains it.
Thanks for searching, & Go Cardinal's!
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
BYprodriver is offline   Reply With Quote
Post Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 11:09 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page