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Highway RPM's

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Old Oct 30, 2006 | 08:44 PM
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Highway RPM's

I'd just like to know what is an acceptable RPM for highway crusin. I have a tendency to be a little heavy on the skinny pedal and damn its not my fault the cruise will set at 85 MPH. Is runnin down the highway at 2600-2800 RPM a bad thing for the engine???
 
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Old Oct 30, 2006 | 08:51 PM
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With my 4.10 axle gearing I can "cruise" around 3000rpms doing 85mph. I have seen 3200 rpm and a pegged speedometer a few times . I think it likes it, but I just dont like the 13-14 mpg when I go that fast.
 
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Old Oct 30, 2006 | 09:11 PM
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Nice to know someone else has a heavy foot lol I have worked on and owned some constrution equipment in the past i.e 425 cats some perkins diesels but man i tell ya when i look around under the hood the first thing i think of is some crazy import fuelie gas enighe with all the sensors and stuffs lol I'm learnin the ropes here with the PSD its a totally new beast to me.
 
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Old Oct 30, 2006 | 09:15 PM
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The 7.3 psd is different, but nothing compared to the newer diesels out.

Keep reading and asking questions and you will learn all you need to know
 
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Old Oct 30, 2006 | 09:16 PM
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i had my 97 up to 3200-3300 rpms, like foreman i didnt like the fuel mileage but no ill effects on engine.

96 is a whole nother story, lets just say its smooth at 4200rpms
 
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Old Oct 30, 2006 | 09:18 PM
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Ya but Luke your going a heck of a lot faster than me . What axle gearing does your have?

oh I thought you were talking about your 96
 
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Old Oct 30, 2006 | 09:21 PM
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I usualy try to do 60 - which is a hair under 2K =) 65 is right at 2K I believe with the c5 4.10 axle. When I get my 38s I might be willing to do 65 =)
 
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Old Oct 30, 2006 | 09:22 PM
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I take it you had your computer reprogramed to move the rev limiter up ??? i am curious as to just how much you can do to these engines with them stayin reliable. i see people doing these mods and i wonder at what milage they are doing them?? i know sorry a bit off topic
 
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Old Oct 30, 2006 | 09:25 PM
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Originally Posted by ForemanES
Ya but Luke your going a heck of a lot faster than me . What axle gearing does your have?

oh I thought you were talking about your 96
97 has 410s and 96 has 355's. I have not ran it up to 4200 in OD with the 3.55's, i think that would be close to 160 mph lol. I did however manage to lock od out while drag racing and bounced it off the 4200 rev in drive until i figured out to push od lock button in. highest ive ever had the 96 in od was about 3600 and beleive me that was plenty fast.
 
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Old Oct 30, 2006 | 09:28 PM
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Originally Posted by SavageVertigo
I take it you had your computer reprogramed to move the rev limiter up ??? i am curious as to just how much you can do to these engines with them stayin reliable. i see people doing these mods and i wonder at what milage they are doing them?? i know sorry a bit off topic
yes my rev is bumped up in my 96. I would not run a stock engine up that high, it will prob not last. The engine in the 96 is no where near stock so running that high occasionally wont hurt it.
 
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Old Oct 30, 2006 | 09:30 PM
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I watched that video! lol

3600rpms in od. WOW
 
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Old Oct 30, 2006 | 09:33 PM
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Originally Posted by SavageVertigo
I take it you had your computer reprogramed to move the rev limiter up ??? i am curious as to just how much you can do to these engines with them stayin reliable. i see people doing these mods and i wonder at what milage they are doing them?? i know sorry a bit off topic
Well Luke is the man to ask about this. He has a couple mods done to his 96 how many miles on the new engine?
 
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Old Oct 30, 2006 | 09:35 PM
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i run mine 2400 at a highway cruise at 70 all day long. driving around i take my shifts (manual) well above 3k religiously.
 
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Old Oct 30, 2006 | 09:40 PM
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"above 3k religiously."

same here, I cannot belive I still get 14-15mpg in town. lol
 
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Old Oct 30, 2006 | 09:50 PM
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i hear you guys there for the size and weight i am amazed what they get for milage, my neighbor has a V10 Dodge and i think he just sold his last kid for gas money, and hell i can still out pull him
 
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