94 240 5-speed Swap Aftermath Question

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45guy
Posts: 38
Joined: Sun Nov 14, 2004 1:41 pm
Car: 1994 S13 convertible

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Swapped 5-speed into my 240 but did not swap rear end. Cruising RPMs are a good 10% higher now. Why?

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rogoman
Posts: 848
Joined: Fri Feb 17, 2006 5:44 pm
Car: 1991 240SX FB
2012 Altima 2.5 S

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The speed sensor is off calibration. Use the one from your A/T.
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45guy
Posts: 38
Joined: Sun Nov 14, 2004 1:41 pm
Car: 1994 S13 convertible

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Make me smart---what does a speed sensor do?
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96_S14_SE
Posts: 973
Joined: Wed Nov 06, 2002 11:10 am
Car: 96 S14 SE - 05 VW GTI 1.8t - 89 S13 coupe "gold on brown"

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It's actually closer to 9.5% different. The final drive gear ratios are different by that amount between AT and MT... Thats it.

4th now should be like driving with the OD off before (3rd) as they are both 1:1 ratios. All other gears in the MT are shorter then the AT, thus another reason why they accelerate faster.
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