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Pages: 1

Gears Hwy: What Speed/RPM Do You Drive At?

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Posted by: Sifrino3

On my way to phx. I try to keep it at or around 2K. Which ends up being 60-70 mphs. Which I am going 8-10mph slower. Do not have the speedo gear changed. So, whats safe. Is this normal for 3.73?

Posted by: NYC LS8

I've had my car up to 3000 RPM for extended periods and it's been fine.

Posted by: Sifrino3

I just don't like driving at 3k when its an xtended time. Short bursts is enough for me. . .

Posted by: MrWilson

i would think that 2500 is fine, and 2800 is fine crusing

Posted by: Sifrino3

i go around 2k - 2500 rpm a little bit higher and when I let off. It does a little jerk. . .

Posted by: Sifrino3

Quote:

Originally Posted by Sifrino3

i go around 2k - 2500 rpm a little bit higher and when I let off. It does a little jerk. . .

Like a pull back. . .

Posted by: BlackIceLSC

If you plan to cruise at 3000 rpms, definately do a force lube, or your tailshaft bushing will enentually go bye-bye. Also, the IMRC's open at 3000, so you'll be right on the cusp of 4-valve intake/exhaust...this usually happens at 84 mph in a stock Mark VIII, and your fuel ratio curve changes dramatically. Your MPG will drop big time at 3000 rpm cruising speed, unless you have a chip.

Stock gears in a Mark VIII base, 74 mph is 2000 rpms. You couldnt ask for a better cruising speed.

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