Drivetrain Questions and info regarding transmissions, clutches, etc.

RPM's at 80 MPH

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  #31  
Old 10-20-2009, 11:58 PM
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^That makes sense. My tire size is slightly smaller than stock so compared to those numbers you posted for 5AT my RPMs are slightly higher (just over 2900 for 3.3 and at 3200 for 3.5).
 
  #32  
Old 10-21-2009, 12:11 AM
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I surprised there isn't someone on this board that knows every FD for every model ever.
 
  #33  
Old 10-21-2009, 12:26 AM
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Wow major misread, sorry guys. I know I'm not at 3050 though. I must have the 3.3 since it's only 50RPM off.
 

Last edited by AARONHL; 12-11-2009 at 12:55 AM.
  #34  
Old 10-21-2009, 01:29 AM
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Its possible that all sedans 03-04 have 3.3 FD. While the 5AT have open diff the 6MT have VLSD. I think that all coupes have 3.5 FD - open for 5AT and VLSD for 6MT.

I know all 5AT between 03-04 have 3.3 FD. I think that 2005+ 5AT have 3.5 FD with VLSD.

All 6MT coupes have 3.5 FD with VLSD.

HR motors have different gearing...3.69 for the Sedan, not sure with the coupe. Assuming all the 3.7L and 3.5HR motors have interchangeable differentials & gearing.
 
  #35  
Old 10-21-2009, 10:48 AM
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Originally Posted by Tollboothwilley
Hopefully I'm grouping these into the right FD since some people don't know.

I'm assuming 6MT came with 3.5 and 5AT are 3.3. I think 2005+ X are 3.5 as well.
You have me listed under 3.3, but I'm pretty sure mine is 3.5.
 
  #36  
Old 10-21-2009, 11:00 AM
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According to www.Infinitihelp.com the 2005 and 2006 RWD 5AT Sedan was made with 3.3 FD and the 5AT AWD and the 6MT both had 3.5 FD

I see no info on the AWD and 6MT models of 2003-2004, but the RWD 5AT models have 3.3 FD
 

Last edited by PAIXAO; 10-21-2009 at 01:25 PM.
  #37  
Old 10-24-2009, 09:46 AM
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Took mine out on the highway yesterday and it is right on 3200 rpms at 80 mph. It's a 3.5 fd with stock 17s and 215/55s.
 
  #38  
Old 10-24-2009, 12:38 PM
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Originally Posted by Tollboothwilley
Its possible that all sedans 03-04 have 3.3 FD. While the 5AT have open diff the 6MT have VLSD. I think that all coupes have 3.5 FD - open for 5AT and VLSD for 6MT.

I know all 5AT between 03-04 have 3.3 FD. I think that 2005+ 5AT have 3.5 FD with VLSD.

All 6MT coupes have 3.5 FD with VLSD.

HR motors have different gearing...3.69 for the Sedan, not sure with the coupe. Assuming all the 3.7L and 3.5HR motors have interchangeable differentials & gearing.
Originally Posted by TwilightBlue
According to www.Infinitihelp.com the 2005 and 2006 RWD 5AT Sedan was made with 3.3 FD and the 5AT AWD and the 6MT both had 3.5 FD

I see no info on the AWD and 6MT models of 2003-2004, but the RWD 5AT models have 3.3 FD
Correct, my 05 5AT came with 3.3 FD w/o vLSD.
 
  #39  
Old 10-25-2009, 12:51 AM
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cool. updated again. thanks for the info. Guess all 5AT RWD Sedan were 3.3. I think 5AT RWD coupe were 3.5 though.
 
  #40  
Old 10-29-2009, 09:46 AM
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All 2003-2005 Model 5AT Coupes have a 3.3 FD

It wasn't until 2006 that the 5AT got the 3.5 FD.

2003-2007 6MT Coupes have the 3.5 FD
 

Last edited by PAIXAO; 10-30-2009 at 04:09 PM.
  #41  
Old 10-30-2009, 02:26 AM
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Roughly 2900RPM with the 3.3FD.

Roughly 3200RPM with the 3.5FD.

5AT here. Had the swap done this past weekend.
 
  #42  
Old 10-30-2009, 04:08 PM
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great. thanks. how is the new FD?
 
  #43  
Old 10-30-2009, 06:20 PM
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3.5 FD 6MT

3000RPM@80 mph with 245/40/19
 
  #44  
Old 10-31-2009, 01:28 PM
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New FD is awesome. Car just feels quicker.. Especially through the corners now.
 
  #45  
Old 12-11-2009, 12:20 AM
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Ok, bumping this one. Sorry I didn't get to it sooner, but here's my results from monitoring with the laptop:
RPM @ 80 MPH - Dash shows 2875 ECM says 2925
Here's the odd part though, the speedometer is dead on 80, and I checked the GPS, also dead on 80, but the ECM says 76-77
Why would it read that speed and then put 80 on the dash I guess I would rather it that way then the other way around, ECM had the right speed but the dash was wrong, that would suck.

Oh yeah... 03.0 G35 Sedan, 5AT w/ 215-55-17
 


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