SL1 vs. SL2 transmission

[John]

Could someone tell me the difference in the transmission between an SL1
and SL2. I think one has a doh or something like that and would like to
know what it means.

Thanks,
John

[Guywire911]

The tranny for the SL1 is geared lower than the one for the SL2.
Someone once posted here that the SL1 will turn at 2600 RPM at 70 mph,
while the SL2 will turn 3000 RPM at the same speed. DOHC refers to the
engine, meaning the SL2 has two camshafts while the SL1 has only one.
JMS; 96SL2a BkGd/Tn AC SP AU+(++) PL KE NG [15K]

"God put me on this earth to do a certain number of things. Right now, I am so far behind, I will never die!"

[Marshall Richards]

The rpm at 70 mph on my wife's SL 1 w/ auto trans is 2450. Are you
talking about a manual trans?
MR

[Ron_Steve]

In article <33FEDE1F...@smile.mv.com> Marshall Richards <m...@smile.mv.com> writes:
>The rpm at 70 mph on my wife's SL 1 w/ auto trans is 2450. Are you
>talking about a manual trans?
>

Manual and automatic should be in the same ballpark, as the top gears are
almost exactly the same (i.e. SL1a=SL1m and SL2a=SL2m when you talk about
the top gear ratio). But 2400-2500 is the range I expected an SL1 to turn
at 70 (extrapolating from driving an SL1 auto and a SC1 manual, both of
which turned about 2200 at 65 mph.)

>
>Guywire911 wrote:
>
>> The tranny for the SL1 is geared lower than the one for the SL2.
>> Someone once posted here that the SL1 will turn at 2600 RPM at 70 mph,
>> while the SL2 will turn 3000 RPM at the same speed.

Yes, and that means the SL1 gearing is lower numerically, which means it's
a higher gear. :)

--Ron

[h....@juno.com]

In article <5tv6jl$hqk$1...@vixen.cso.uiuc.edu>,

rst...@uiatma.atmos.uiuc.edu (Ron_Steve) wrote:
>
>
> Manual and automatic should be in the same ballpark, as the top gears are
> almost exactly the same (i.e. SL1a=SL1m and SL2a=SL2m when you talk about
> the top gear ratio). But 2400-2500 is the range I expected an SL1 to turn
> at 70 (extrapolating from driving an SL1 auto and a SC1 manual, both of
> which turned about 2200 at 65 mph.)
> >

I can confirm Ron's comments from the following calculations that I did
recently when the subject came up on the Saturn Mailing List

Curiosity got the best of me, and I took the gear ratios, final drive
ratios, wheel diameters, pi, number inches in a foot, number of
feet in a mile, phase of the moon, and tried to derive the equation
relating RPM to MPH and vice-versa. BTW, final drive ratios appear to
bbe the same in all Saturns (4.060). I think I got it correct, since I
finally got numbers that looked consistent with reality.

Anyway, here is what I calculated

SL2 (185/65-15) final drive ratio 4.060

automatic manual
4th gear 0.70 5th gear 0.73
75 MPH ===> 2928.14 RPM 75 MPH ===> 3053.63 RPM

SL2 (195/60-15) final drive ratio 4.060

automatic manual
4th gear 0.70 5th gear 0.73
75 MPH ===> 2959.05 RPM 75 MPH ===> 3085.91 RPM

For comparison, here is my econocoupe (the automatic)

SC1 (175/70-14) final drive ratio 4.060

automatic manual
4th gear 0.595 5th gear 0.605
75 MPH ===> 2575.53 RPM 75 MPH ===> 2618.82 RPM

In any given model, there doesn't seem to be a big difference
between the automatic vs. the manual in terms of RPMs at the
same speed in top gear.

the HumpMan
97 SC1a...

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