I was wondering if this is about correct rpm's for a 5 spd 2.5. I am turning about 1600 rpm for an indicated 55 MPH. When I bought the car there was a 120 MPH speedometer in it, and I read some where that was a GT only speedometer. If it is reading incorrect, how do I get it to read correct? It feels about right for 55 mph. Or could the tach be reading incorrect thinking it was still a 6 cyl engine?
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07:43 PM
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linuxpowered88 Member
Posts: 1220 From: Johnson City , TN , USA Registered: Sep 2007
The tach could be off but It sounds about right im not sure how much difference the 6 and 4 cyl tachs are in calibration. Also are you sure the speedo only wasn't switched? If you have an oil pressure guage in with the tach you have the dukes tach.
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08:59 PM
josef644 Member
Posts: 6939 From: Dickinson, Texas USA Registered: Nov 2006
No, my oil pressure is in the auxilery gauge set along with a volt meter. I thought some one with a 4 cyl might know where their rpms are at 55 mph Joe
[This message has been edited by josef644 (edited 01-13-2008).]
I was wondering if this is about correct rpm's for a 5 spd 2.5. I am turning about 1600 rpm for an indicated 55 MPH. When I bought the car there was a 120 MPH speedometer in it, and I read some where that was a GT only speedometer. If it is reading incorrect, how do I get it to read correct? It feels about right for 55 mph. Or could the tach be reading incorrect thinking it was still a 6 cyl engine?
That is about right. I have an 88 duke/5 speed and turn 2000 RPM at 60 MPH. Never took a reading at 55, but if you divide it out, it's 33.333MPH/1000 RPM. At 1600 RPM = 53.3328.
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11:23 AM
Pyrthian Member
Posts: 29569 From: Detroit, MI Registered: Jul 2002
I was wondering if this is about correct rpm's for a 5 spd 2.5. I am turning about 1600 rpm for an indicated 55 MPH. When I bought the car there was a 120 MPH speedometer in it, and I read some where that was a GT only speedometer. If it is reading incorrect, how do I get it to read correct? It feels about right for 55 mph. Or could the tach be reading incorrect thinking it was still a 6 cyl engine?
depends on the transmission. but - that does sound way low in RPM.
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11:35 AM
niemann99 Member
Posts: 258 From: Seattle, WA USA Registered: Dec 2006