Optimum RPM
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Cross-Country
Joined: Aug 2006
Posts: 68
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From: CA
Optimum RPM
Way back in high school auto, they use to teach us to keep your RPM around 2100-2500 when driving down the road. In my truck with the overdrive on I would be running at about 85 to 90 miles an hour, (5.4 Super cab 3.73 4wd)
Are modular motors designed to run at low rpms (under 2000) or should the over drive be turned off more often.
Are modular motors designed to run at low rpms (under 2000) or should the over drive be turned off more often.
Posting Guru
Joined: Jul 2004
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These Ford engines develop 90% of their torque in the low rpm range, that's why there is such a steep overdrive. So The old 2100 to 2500 rule is old school Now a 4 cylinder low dispklacement engine maybe closer to that rule. The 3v 5.4 is almost at peak torque at 1800.
As far as down shift from 4 to 2 or 3 to 2 makes no difference on the trans at all! It still has to go thru the same procedure just skips 3 when in 4th.
The only real resaon to keep it out of 4 the is if the trans is constantly down shifting.
As far as down shift from 4 to 2 or 3 to 2 makes no difference on the trans at all! It still has to go thru the same procedure just skips 3 when in 4th.
The only real resaon to keep it out of 4 the is if the trans is constantly down shifting.
Senior User
Joined: Nov 2005
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From: Sonoma, CA
5.4 seems to like 1800 rpm...
just finished a 2000 mile trip towing 20 ft. enclosed trailer....halfway empty, returned loaded with car. Played with mileage alot. Locked out the O/D for reduced gear 'hunting', and actually improved mileage to avg. 13.6. Best was right at 1800. Brian
www.brianferrin.com
www.brianferrin.com
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Freshman User
Joined: Jan 2006
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As far as down shift from 4 to 2 or 3 to 2 makes no difference on the trans at all! It still has to go thru the same procedure just skips 3 when in 4th.
The only real resaon to keep it out of 4 the is if the trans is constantly down shifting.[/QUOTE]
I was told its less wear and tear on your auto trans, when passing on the highway, shifting from 3-2 than a 4-2 downshift at w.o.t.
Was I misinformed??
The only real resaon to keep it out of 4 the is if the trans is constantly down shifting.[/QUOTE]
I was told its less wear and tear on your auto trans, when passing on the highway, shifting from 3-2 than a 4-2 downshift at w.o.t.
Was I misinformed??
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Joined: Jul 2006
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Originally Posted by Coupleofords
just finished a 2000 mile trip towing 20 ft. enclosed trailer....halfway empty, returned loaded with car. Played with mileage alot. Locked out the O/D for reduced gear 'hunting', and actually improved mileage to avg. 13.6. Best was right at 1800. Brian
www.brianferrin.com
www.brianferrin.com
13.6 sounds like really good mileage--that's a lot of wind resistance and decent amount of weight with that trailer...that's good to hear!
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