[B]240SX/Silvia transmission swap vehicle speeds vs rpm[/B] - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

bshotts · 07-14-2008, 11:39 AM

Doing some research on common trans swaps for the S chassis, I finally had enough of hand calculating to use the ole noggin and put together this handy Excel doc.

You’ll find the first tab lists some common gearbox ratios from the Nissan family and others (ie SR20DET, S15 SR20DET, VG30DETT, 2JZGTE) and will have two gray boxes that ask for total tire diameter and final drive gear ratio. Each different trans has it’s own appropriate tab listing vehicle speed based on engine RPM.

I found this useful for many things: comparing speeds and RPMs between different transmissions, finding cruise RPMs, finding 60 mph RPMs, seeing changes due to swapping differentials, top speeds etc. I really wanted to have an end-all spreadsheet to see the results of all these different combinations.

The spreadsheet currently has the 4.08 final drive ratio which should be standard 240SX final drive (differential) ratio and an approximate value of total tire diameter with OEM 16” S14 wheels. Again, these values can be changed for individual wheel/tire combinations and different final drives.

Let me know if you would like to see any other transmission included.

Bryan

Link to file is below:
http://www.mediafire.com/?mehaq0zko1z

cgtdream · 07-14-2008, 01:50 PM

Wow this is pretty cool bro. Think i might go for a read on transmission and gearing so ill better understand what ya got here

bshotts · 07-15-2008, 08:11 AM

Has anyone found this useful? If so, I motion to have it archived in FAQ or stickied for tech just so we don't lose track of it.

07-14-2008, 11:39 AM	#1
bshotts Zilvia Junkie Join Date: Jan 2003 Location: Indianapolis, IN Age: 41 Posts: 472 Trader Rating: (13) Feedback Score: 13 reviews	[B]240SX/Silvia transmission swap vehicle speeds vs rpm[/B] Doing some research on common trans swaps for the S chassis, I finally had enough of hand calculating to use the ole noggin and put together this handy Excel doc. You’ll find the first tab lists some common gearbox ratios from the Nissan family and others (ie SR20DET, S15 SR20DET, VG30DETT, 2JZGTE) and will have two gray boxes that ask for total tire diameter and final drive gear ratio. Each different trans has it’s own appropriate tab listing vehicle speed based on engine RPM. I found this useful for many things: comparing speeds and RPMs between different transmissions, finding cruise RPMs, finding 60 mph RPMs, seeing changes due to swapping differentials, top speeds etc. I really wanted to have an end-all spreadsheet to see the results of all these different combinations. The spreadsheet currently has the 4.08 final drive ratio which should be standard 240SX final drive (differential) ratio and an approximate value of total tire diameter with OEM 16” S14 wheels. Again, these values can be changed for individual wheel/tire combinations and different final drives. Let me know if you would like to see any other transmission included. Bryan Link to file is below: http://www.mediafire.com/?mehaq0zko1z Last edited by bshotts; 07-14-2008 at 11:40 AM.. Reason: speeling haha

07-14-2008, 01:50 PM	#2
cgtdream Zilvia Junkie Join Date: Feb 2007 Location: Nowhere Age: 38 Posts: 431 Trader Rating: (4) Feedback Score: 4 reviews	Wow this is pretty cool bro. Think i might go for a read on transmission and gearing so ill better understand what ya got here __________________ Juicy slayin aint easy, but dammit somebody has to do it!!!

07-15-2008, 08:11 AM	#3
bshotts Zilvia Junkie Join Date: Jan 2003 Location: Indianapolis, IN Age: 41 Posts: 472 Trader Rating: (13) Feedback Score: 13 reviews	Has anyone found this useful? If so, I motion to have it archived in FAQ or stickied for tech just so we don't lose track of it.