cdavis50

I have a 98 camaro ss m6 and a friend of mine has a 00 ss basically identical cars. Well we have found out that our rpm's doesn't match and I was wondering what you all run. My car in 6th gear at 80 is pretty much right at 2000 rpm's at the same speed his is around 1800 and he can run 90 at 2000 rpm's. My car normally idles at a grand, with me having the older car and more milage I take it my rpm guage is off.

CamaroSS27

iTrader: (6)

Sounds like it may be off or tuning issue. Mine runs what his does.

SSCamaro99_3

iTrader: (1)

Are you sure you both have the same rear gears? Is his a manual or automatic?

cdavis50

Both have t56 tranny same rear end and same size wheels and tires.

SSCamaro99_3

iTrader: (1)

http://www.f-body.org/gears/

Survey says there is a good chance you have 3.73's in the rear end.

redtan

iTrader: (5)

You don't have the same rear end gearing as he does.

jmm98LS1

iTrader: (28)

The factory tach in every '98 car I've tuned, mine included, reads ~200 rpm higher than actual engine speed all the way through the gauge sweep. Factory M6 idle is 800rpm, this is likely what's going on with yours since your tach says 1000 at idle. Put a scanner on it and you'll see actual RPM is ~200 less.

cdavis50

So how would I go about fixing this problem, just getting it tuned? And about the rear end, we both have stock 342s

cdavis50

Thinking on it, I thought having a different rear end and wheels only threw off the speedo not the rpm gauge...I've had 3:73s in a Mustang and it did throw off the speed but the rpm's were exactly the same, other than them reving faster

3.8redbird

iTrader: (3)

At a constant speed the RPM will be different from someone with a different gear set.

RPM will still read the same but having lower (numerically higher) gears drops top speed in each gear but offers quicker acceleration.

cdavis50

Yeah I understand that I'm just saying it doesn't throw it off like the speedo. It still reads right but higher since of the rearend. But I'm pretty sure mine is flat out off I don't know of many cars that idle at a grand like mine indicates.

Fry_

It's probably just your tach. My 98 is the same, I wouldn't really worry about it 200rpm really doesn't matter that much. If your really worried about accurate shift points then get a shift light.

cdavis50

Yeah figuring it is a little off I'm not super worried about it but I do hate little stuff like that being wrong so I will get it fixed one day.

HoLLo

iTrader: (17)

With my 4.11's, I run 2000 at 75mph, you definitely have some gears in there, or like stated, the tach is off.