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Best cruising rpm for e6 300


Timmyb
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What do you guys think the best cruising rpm is at 60mph? Both for fuel economy and pulling? I've got a 2v 300hp and I can get a cheap rto11613 13 sp single overdrive and 3.9 diffs. This combo should see me sitting at 1800rpm at 60mph (100kmh). What do the e6 engines like to run at?

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  • 3 weeks later...

What do you guys think the best cruising rpm is at 60mph? Both for fuel economy and pulling? I've got a 2v 300hp and I can get a cheap rto11613 13 sp single overdrive and 3.9 diffs. This combo should see me sitting at 1800rpm at 60mph (100kmh). What do the e6 engines like to run at?

A .74 OD in the 13 spd and 3.90 rears with a 42" tall 11R22.5 or lo pro 24.5 would put you @ 77mph @ 1800 rpm, 69mph@1600rpm, I am like Superdog keep it close to 1600-1650 and itll pull great, if you run it over itll just pull down to 1600 on a hill anyway. If your going to go to the 13spd, or any eaton trans with a .74OD, you should shoot for a gear ratio around 4.42 to 4.17, 4.42 will get you doing 61mph@1600, 4.17 would be 64mph, I think a 4.64 would be a little steep for fuel mileage it puts it close to 1700 rpm @ 60, but it would probably pull great around 55-60mph or 88-95kmh

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