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Old 06-27-2016, 10:46 AM   #1
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W24/8.1 Vortec/Allision 6-Speed Cruisng Sweet Spot

Fairly new to this and am rethinking what speed to cruise. Been doing 60 mph but have read that 62 is popular. At what rpm is the 8.1 putting down best torque?

Thanks.
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Old 06-27-2016, 11:17 AM   #2
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When doing hills the greatest HP comes around 3,200 - 3,400 rpm. So I don't worry about pushing the engine any more than that.

When just cruising on a flat highway I have found 62-65 mph seems to be the sweet spot for me. And if memory serves me today, that's around 2,100 rpm.
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Old 06-28-2016, 06:02 AM   #3
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On my 04 chassis 2300 RPM does it for me while cruising and I try not to let it get above 4000 RPM when in the mountains.
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Old 06-28-2016, 06:21 AM   #4
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Quote:
Originally Posted by Crossingover View Post
Fairly new to this and am rethinking what speed to cruise. Been doing 60 mph but have read that 62 is popular. At what rpm is the 8.1 putting down best torque?

Thanks.
I vary my speed relative to direction and speed of prevailing wind. 55 to 63 mph. I also tow a Fit auto and as you know 65 mph is max tow speed. I try to keep rpms below 3400 climbing mountains. Coach seems happy at 63 mph, 8.5 mpg. Good luck.
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Old 06-28-2016, 07:19 AM   #5
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Old 06-29-2016, 09:40 AM   #6
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Perfect, thanks alot. What's special about the 400 TQ crossover at 1600 rpm? I'll cruise with my rpm on the left flat of the curve in the future (assuming that will be around the popular 62 mph mark). Won't need to go to the other end of the flat much other than rolling out (don't travel much in hill country). The dash rev counter should have an orange line along the 2200 to 3200 sweep of the gauge for driver reference.
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