cruising speed

[gt1009]

Since fuel is so expensive, I was wondering if anyone on here knows the most efficient RPMs for the 6.2 diesel. If we get that i'm sure someone can do the math and figure out our most efficient speeds for the blazers and trucks.
Thanks,

 

[CCATLETT1984]

2150rpm

 

[AJMBLAZER]

Don't forget that aerodynamics plays a large part...especially since we're essentially driving rectangles with rounded edges.

There's a thread over on CK5 I'll try to find. It has a bit out of a GM manual that discusses the amount of hp for one of these trucks to achieve certain speeds. Past 55mph it goes up sharply and you realize just how unaerodynamic these vehicles are.
http://coloradok5.com/forums/showthread.php?t=113688&highlight=aerodynamic
Last page has some diesel specific info on it.

 

[msoumas]

Re: RE: cruising speed

Don't forget that aerodynamics plays a large part...especially since we're essentially driving rectangles with rounded edges.

There are rounded edges?

 

[AJMBLAZER]

RE: Re: RE: cruising speed

Sure...right at the edges...

 

[msoumas]

Re: RE: Re: RE: cruising speed

Sure...right at the edges...

I figured they just weathered down over time.

 

[AJMBLAZER]

RE: Re: RE: Re: RE: cruising speed

No, that's rust.

 

[JohnFire]

RE: Re: RE: Re: RE: cruising speed

I thought the rust helped the airflow in the lower part of my truck. Kinda like air vents or a swiss cheese effect.

That and the lack of metal is reducing the weight of the truck.

 

[AJMBLAZER]

RE: Re: RE: Re: RE: cruising speed

Yeah but the rough edges and finish create a lot of drag.

 

[maritimer]

RE: Re: RE: Re: RE: cruising speed

well i burn 1/4 of a tank going 85mph for 30minutes straight, not sure if that helps LOL

 

[bulldog_mack13]

RE: Re: RE: Re: RE: cruising speed

WOW, thats bad lol

 

[maritimer]

Re: RE: Re: RE: Re: RE: cruising speed

WOW, thats bad lol

lol well i also have the engine/fuel delivery tweaked for optimum power not fuel economy lol

 

[AJMBLAZER]

RE: Re: RE: Re: RE: Re: RE: cruising speed

...and 85mph takes at least 25% more hp for one of these trucks to maintain then 65 so yea...oww...

Lower the speed and obviously you'll see better mpg.

 

[gt1009]

RE: Re: RE: Re: RE: Re: RE: cruising speed

85 mph for 30 minutes? You must have ears of steel to stand up to that kind of noise. Also, isn't 85 about the max speed you can get on flat ground?

 

[maddawg308]

Re: RE: Re: RE: Re: RE: Re: RE: cruising speed

Also, isn't 85 about the max speed you can get on flat ground?

85 in a M1009 is about maximum. if you're going 85 in a deuce, not only is something wrong with your truck, but you're probably going to die in it.

 

[aboonski]

Engine RPM

I am interested in finding a way to install a tachometer on a 6.2 diesel to see what is going on under the hood at various speeds. I understand that there is a tach which uses the balancer with a magnetic pickup to show RPM but don't know where to buy such a device. Any suggestions? I too am interested in achieving the best mileage with my M1008A1.

 

[maritimer]

Re: RE: Re: RE: Re: RE: Re: RE: cruising speed

85 mph for 30 minutes? You must have ears of steel to stand up to that kind of noise. Also, isn't 85 about the max speed you can get on flat ground?

it does have a nice rumble with the duel cherry bombs, as for max speed i can get her up to where the speed needle is inline with the 3rd number in the odometer and maintain it but she vibrates like crazy at that point but thats only on flat ground or downhill, uphill she wont top 75mph.

 

[jwaller]

RE: Re: RE: Re: RE: Re: RE: Re: RE: cruising speed

you can get a tach that uses the alternator. thats how it works in the hmmwv.

 

[aboonski]

Tachometer

I'll check to see if there are any threads on the Hummer tach drives. Thanks for the info!

 

[EO2NMCB]

RE: Tachometer

aboonski, autometer makes a tach for diesels that uses the alternator. Any good parts store should be able to order it. Years ago I put one on a 3116 cat and it worked great.