Date: Tue, 6 Nov 2001 10:26:08 -0500
From: "KeithG" <noonenopsamspring.com>
Subject: Re: Does a 900S classic auto trans really cause my engine to rev higher  than a 5-speed?


All the Saab C900/99 5 sp and 4 sp have a 1:1 top gear period. The differences is with the final drive and the primary gears. The final drives in the manuals are either 9:33 or 9:35. I do not know what the auto boxes have. These gears reverse direction and offer a mechanical advantage change. These are interchangeable on the 4 and 5 sp gearboxes, but I do not know about the automatics. I would guess that the later 16V turbos probably have similar overall ratios in top gear (auto to manual), but the 3 gears vs the 5 makes the acceleration to terminal velocity a bit slower. KeithG "Tony" <NOSPAMtshiminopsam.com> wrote in message news:3BE710C9.F22A3A47nopsam.com... > my numbers for a 91 900S 5 Speed (same engine as yours) > Just ran these on the way home!. > > 65mph = 2,600rpm, 70 = 2,700, 75 = 2,900, 80 = 3,100 > > BTW in 91-93 900 models I believe that the 5th gear is > NOT an over drive i.e. ratio is 1 : 1. > > The final drive for auto and 5-speed (probably) different; this > is where the difference comes from!. > > Cheers, > -- > Remove "NOSPAM" from address for direct e-mail > ####### > # #### # # # # > # # # ## # # # > # # # # # # # > # # # # # # # > # # # # ## # > # #### # # # > > Dennis Cathey wrote: > > > > I have a '92 900S 16V with an auto trans. Besides being more fun to > > drive, I want a 5-speed so that I can cruise at 70 - 75 MPH without my > > engine reving-up to approx. 3500 rpms. I recently test-drove a 1990 900 > > with a 5-speed, and it seemed like I was still pretty close to 3500 rpms > > when I was at 70 MPH in 5th. > > Here are the rpms at which my engine is purring when I'm going 60 - 80 > > MPH in 'Drive.' Can you boys & girls with 5-speeds tell me if there is > > an appreciable difference (reduction) in your cars' engine speed (either > > 4th or 5th gear) at these driving speeds? > > 60mph=2700rpm, 65 = 3000, 70 = 3200, 75 = 3500, 80 = 3700. > > Thanks for your time. > > Dennis

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