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C900 Performance, Mods & Tuning Covers Tuning & Performance modifications for the Classic 900 (C900)

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  #1  
Old 12th June 2003
Deans88SaabT16 Deans88SaabT16 is offline
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Default Gear ratios for transmission

I'm looking for information on the availability of different gear ratios for my 88 5 speed. I would like to open up the top end of the car, as I have seen from many posts in here that dragging is a tad hard on the transmissions. I don't care to go through a few transmissions as they are hard to find around here, let alone a reputable shop that can rebuild it.
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  #2  
Old 12th June 2003
Carl Hernandez Carl Hernandez is offline
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i believe that widde's site has a chart with the diffrent gear ratios for diffrent boxes.
check it out: www.900aero.com
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  #3  
Old 12th June 2003
tandino tandino is offline
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How fast do you wanna go :! ,
I have the rare no.8 promary drive in my gearbox - 27.5mph/1000rpm in 5th gear = max of 162.5mph on the limiter in 5th gear - i reckon my car will pull this too

Pete.

fyi - no.6 primary gives 23.5 mph /1000 rpm 5th gear
no.7 ..............25.5.......................
no.8 ..............27.5.......................

Pete.
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  #4  
Old 13th June 2003
Deans88SaabT16 Deans88SaabT16 is offline
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At 70mph, I am sitting right at about 2800rpms, which is a lot higher than what I'd like to see. As far as top end speeds ...... I'd like to see at least 160, but I can't raise the gearing too high because it is a daily driver. I am not sure what the factory gearing is right now, so could anyone help me out there?

Carl, I have that site bookmarked. Thanks.
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  #5  
Old 13th June 2003
DeLorean DeLorean is offline
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2800? that's not toooo bad, a slush box is probably turning over 4000 RPM's at that speed
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  #6  
Old 13th June 2003
Deans88SaabT16 Deans88SaabT16 is offline
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ouch That's twisting it a bit tight
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  #7  
Old 14th June 2003
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niko niko is offline
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I have the GM55804.
As you can see, at 5100rpm i can reach 228kph (142.5mph) but it's a speedo read with 8% error...For your information, 90kph@2000rpm / 120kph@3000rpm.
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  #8  
Old 14th June 2003
TheRedRocket TheRedRocket is offline
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lightning niko!!!
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  #9  
Old 14th June 2003
Carl Hernandez Carl Hernandez is offline
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yes that man is killing it.
nice speedo tho.
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  #10  
Old 15th June 2003
TheRedRocket TheRedRocket is offline
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Quote:
Originally Posted by Carl Hernandez
yes that man is killing it.
nice speedo tho.
what do you mean killing?
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  #11  
Old 15th June 2003
Carl Hernandez Carl Hernandez is offline
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oh seems like my vernacular is not recognized.
killing it = step on it = floor it
or it can be used to describe an action that should take place fast Ex: bonging a beer one would say to the bonger "kill it dude!"
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  #12  
Old 15th June 2003
TheRedRocket TheRedRocket is offline
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Thanks for the explaination, I thought maybe you meant "Killing" as in death of his engine or something
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  #13  
Old 16th June 2003
johniemi johniemi is offline
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This discussion about the "holy" primary no.8 brings up an idea; why not remake a set of these no.8 primaries? I figure it wouldn't cost too much to make a set of these? The chains should be standard stuff and one could just remake the other (f.ex. the smaller) gear leaving the larger gear intact.

So does anyone know whether someone could take the smaller primary gear (meaning the three rowed geard in the turbo gearbox) and make it a little bigger? Or just machine a totally new gear straight from a block of steel? The only problem would probably be that there are three gears in a row, I wonder if they could be made one by one and then welded together to form row of three?

I have been talking about this with one guy who makes customs and hot rods out of old Vauxhalls, and he said that basically it wouldn't be hard to machine one new gear at a reasonable price. But does anyone know how to combine them in a row?

Imagine putting a no.8 gearset in a strengthened 4 speed box with the shorter 3.67 diff... LOOONG gears and more speed (if you have the HP...)
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  #14  
Old 1st February 2005
Marjan Marjan is offline
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Old thread but I just want to start the discussion again about primary no 8. Jorgen Eriksson will maybe have these made in a near future but if more people contact him about this issue the priority will increase because he has other projects as well.

The primary will be 8,5 recalculated and I'm getting one
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  #15  
Old 1st February 2005
DeLorean DeLorean is offline
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wow, I want a set! any idea on pricing?
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  #16  
Old 1st February 2005
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There was a number 8 primay set at the saab dismantling do. I pointed it out to a few people, but noone was interested!
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  #17  
Old 1st February 2005
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thats funny I would of thought they would of been snapped up.......
as there like hen`s teeth.

Paul


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  #18  
Old 1st February 2005
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nutcase nutcase is offline
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You and me both! In the end Inspector Gadget baggsed the engine and gearbox for a later date to be refurbed.
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  #19  
Old 1st February 2005
Marjan Marjan is offline
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Quote:
Originally Posted by nutcase
There was a number 8 primay set at the saab dismantling do. I pointed it out to a few people, but noone was interested!
If you would help me out or somebody else to retrieve this primary I would be very happy
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  #20  
Old 1st February 2005
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You'd have to speak to Inspector Gadget about that
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