rpms seems too much - Team Camaro Tech
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post #1 of 3 (permalink) Old Jul 31st, 03, 04:44 AM Thread Starter
Join Date: Jul 2003
Posts: 13

Has anyone had this problem? I have got 69 Z/28 with 3.55 rear gear (they have been confirmed) but tach shows about 3800 at 60 miles per hour. Trans is four speed with a male electrical plug on front most shifter fork, also points have been changed to electronic. Engine does not really sound that loud but flow masters are loud out the back. Thanks T Jones

Thanks for the reply but I forgot to mention speedo has been checked, also at 50 mph it is dead on, at about 3000 rpm's. I got to wondering if electronic module that replaced points could cause tach to read wrong. Could 4th gear be something other than 1.1.Also tire size is 235R6015. Thanks

[ 07-31-2003, 09:00 AM: Message edited by: jones4 ]
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post #2 of 3 (permalink) Old Jul 31st, 03, 05:42 AM
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My guess would be that your speedo is off, and when it says you're going 60, you're probably going closer to 75, and 3800 RPM's at 75 MPH is pretty close with 3.55's.

Your car probably came with 4.11's, and when someone swapped them out for 3.55's, they never changed the speedo gears inside the transmission, giving you false speedo readings.

Watch out for cops until you get the speedo corrected. At 3,000 RPM's, you're probably going about 67 MPH.
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post #3 of 3 (permalink) Old Jul 31st, 03, 03:03 PM
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I had a similar problem where my factory speedo did not match up with the factory tach readings. I used a GPS to measure the speed and found the speedo was right on but the tach was reading way low. I just sent the tach off to be rebuilt. It can happen either way. [img]smile.gif[/img]

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