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 > Ideal V8 rpms when towing?

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ajriding

st clair

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Posted: 10/08/19 05:14pm Link  |  Quote  |  Print  |  Notify Moderator

Consider your transmission also. Is 6th gear an over-drive gear? If so, then it may be putting a lot of heat into the tranny with such a load, uphill in overdrive. I would never do this without a transmission temp sensor.
Automatic will figure it out for itself, but a manual will not. Shift down on almost all hills.

bwlyon

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Posted: 10/08/19 05:22pm Link  |  Quote  |  Print  |  Notify Moderator

We have a Ram 3500 SRW 6.4 hemi with 3.73 gears. As a general rule the hemi likes to cruise at 2000-2500 rpm. Depending on speed limit posted that means either 4th or 5th gear on our 6 speed auto transmission. If we are cruising in hilly terrain 4th gear seems to be the best gear to limit down shifts.

jaycocreek

Idaho

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Posted: 10/08/19 05:51pm Link  |  Quote  |  Print  |  Notify Moderator

Keeping the mighty 460 to 2,000 rpms,makes it sip gas....Luckily,most of the roads I travel have 45-60 mph speed limits...4.10 gears has it zipping up the hills like there not even there..Faster than a speeding bullet and more powerful than a locomotive ...

The 460 Ford(Laughing)

MORSNOW

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Posted: 10/08/19 06:44pm Link  |  Quote  |  Print  |  Notify Moderator

It's RPM (Revolutions per minute)as in the number of turns in one minute. Not RPMS (Revolutions per minutes), we have no idea how many minutes you are talking about.

Lower RPM does not always give the best gas/fuel mileage, you can lug an engine down too low and hurt your mileage. Depending on your load, the sweet spot can change for the best mileage.


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deltabravo

Spokane, WA

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Posted: 10/08/19 07:54pm Link  |  Quote  |  Print  |  Notify Moderator

Kayteg1 wrote:

Each engine has it "sweat spot"


My Duramax doesn't sweat


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Bert Ackerman

Palm Beach

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Posted: 10/08/19 08:22pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

I usually recommend close to the rpm associated with the peak torque rating.
Maybe a little lower if lightly loaded and a little more if running heavy.



Op is talking about cruising and slight grades, depending on the year of the 6.2 you usually recommend doing that at 3800 or 4500?

specta

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Posted: 10/08/19 08:24pm Link  |  Quote  |  Print  |  Notify Moderator

Transmission selector in D, tow haul button engaged.

Let the truck decide what's best. [emoticon]


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specta

utah

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Posted: 10/08/19 08:25pm Link  |  Quote  |  Print  |  Notify Moderator

deltabravo wrote:

Kayteg1 wrote:

Each engine has it "sweat spot"


My Duramax doesn't sweat


[emoticon] [emoticon] [emoticon] [emoticon]

Neither does my 6.0. [emoticon]

valhalla360

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Posted: 10/09/19 12:00am Link  |  Quote  |  Print  |  Notify Moderator

specta wrote:

Transmission selector in D, tow haul button engaged.

Let the truck decide what's best. [emoticon]


Yep, with modern trucks, the engineers have sorted out which gear the transmission wants.

Now if you have an older truck or manual transmission, it's valid question.


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Kayteg1

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Posted: 10/09/19 12:49am Link  |  Quote  |  Print  |  Notify Moderator

When new computer programs adjust the gears torque-wise, they lack intelligence to plan for engine cooling on long grades.
It was common on older heavy sets that well pulling engine will overheat 1/2 the way up the mountain and easy prevention was force it to drop couple of gears when starting and not going faster than 1/2 throttle.
This way higher rpm with less load provide for better engine cooling.
Same going downhill, when even with engine brake and speed controlling program, you might face situation that will call for more downshifting.





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