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clockthis1979 11-17-2012 10:52 PM

High rpms!?
i have a 94 325 IS and when i am doing 80 mph my rpms are about 4,250 give or take 50... this just seems like lot to me, so i dont know if someone changed the rear end out of a four banger (if the gear ratio is different) but i dont know?.. My car is a five speed. My mustang is a five speed as well with a v8 pushing 450hp with 3.55 gears and it doesn't even spin that fast at 80mph. so i am just wanting to know if what the I6 five speed gear ratio is to an I4 gear ratio??

r33p04s 11-18-2012 12:32 AM

maybe it was a swap n you have an auto rear diff...the 4 cyl one wouldnt fit

TheFinanceGuy 11-18-2012 12:43 AM

Crawl under and look for a tag on the rear diff to see what gear ratio it is.

jonesin 11-18-2012 06:13 AM

Look here. Specifically posts 8 & 9.

Bimmer1995318ti 11-18-2012 06:56 AM

Your on spot man ! My 318ti is the same way, these are super high revving "performance" 4 cylinder engines. So your reasonable power area is around 4000 rpm

johnf 11-18-2012 07:54 AM

I might have written the reasonable power area starts around 4000 rpm.

Bimmer1995318ti 11-18-2012 08:24 AM

Thanks John -_-

clockthis1979 11-19-2012 09:21 PM

i can read what is left of the tag on the rearend and it looks like is says 3.90 and then it is not readable so im not sure if the auto read is the same gear ratio standard...?

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