max safe RPM operating range?
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Junior User
Joined: May 2003
Posts: 87
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From: Houston
max safe RPM operating range?
My 97 psd has a 4.10 rear end, at 55 its at about 2000 rpm, at 70 its at 2500rpm. what is the safest rpm range to operate it at so i dont blow my motor up or somthing.
Fleet Mechanic
Joined: Aug 2003
Posts: 1,773
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From: Phoenix, AZ
Put in the pyro gauge. That should determine your maximum operation range based upon EGT's.
Other than that, change your gears out to 3.73 if you want better mileage, lower RPM's, EGT's, etc.
Other than that, change your gears out to 3.73 if you want better mileage, lower RPM's, EGT's, etc.
Junior User
Joined: Oct 2003
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From: Colorado
Originally posted by cookie88
RPM wise you are G to G. It'll turn 3400 rpm all day every day.
RPM wise you are G to G. It'll turn 3400 rpm all day every day.
Boost is about 21 lbs right before it drops.
CH
Fleet Mechanic
Joined: Aug 2003
Posts: 1,773
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From: Phoenix, AZ
Chip it.
I installed the Diablo chip and in the 78 hp mode the boost gets over 25 lbs.
I installed a pop off pressure valve that is calibrated to 24 lbs. in the MAP line so the SES light doesn't come on.
I read somewhere that overboosting 25 lbs + isn't good on the heads?
I installed the Diablo chip and in the 78 hp mode the boost gets over 25 lbs.
I installed a pop off pressure valve that is calibrated to 24 lbs. in the MAP line so the SES light doesn't come on.
I read somewhere that overboosting 25 lbs + isn't good on the heads?
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FTE Leadership Emeritus
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From: Cabot, Arkansas
I read somewhere that overboosting 25 lbs + isn't good on the heads?
When my truck get to about 3300 the boost will drop to about 15 lbs and the engine just lays down want rev any higher.
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FTE Leadership Emeritus
Joined: May 2001
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From: Cabot, Arkansas
27psi pulling a 78' Bronco from OK. back to CO. Yes, my light came on...but I couldn't feel any power loss.
Postmaster
Joined: Feb 2002
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From: Bonney Lake, WA
As cookie88 said, installing any of the devices that fool the MAP sensor will not change the amount of boost your truck produces, but it will reduce the amount your MAP sensor sees, so it won't defuel when you get to the 22psi level.
Elder User
Joined: Dec 2001
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From: Kelowna B.C.
It is a very good question, what is the safe operating range. Crawling around in the woods how low is to low and how high can it be reved without hurting it while it tries to fing the bottom of a mud hole and theres no time to shift?
FTE Leadership Emeritus
Joined: May 2001
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From: Cabot, Arkansas
Crawling around in the woods how low is to low
how high can it be reved without hurting it while it tries to fing the bottom of a mud hole and theres no time to shift?
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