99 PSD maximum rpms - Ford Powerstroke Diesel Forum
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Old 06-24-2009, 06:39 PM
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99 PSD maximum rpms

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Hi guys i been wrenching all my life but im new to owning and modyfying a diesel engine i started by doing simple mods like exhaust intake chip etc .but i understand the working principals of an PSD . my next step is going to be turbo injectors hpop , i understand all that but i wonder what is safe RPM limit for PSD ,my truck is a 6 speed dually with 4.10s and rising rpms limits was one way to make gears pull longer without shifting . i did build multiple turbocharged engines ranging from aircooled vw beetle to ls1 powered jeep wrangler i was hoping it was possible to extend rpmm range as far as 4500rpms . is this possible ?
the most i ever hit was 3883 rpm according to my computer i heard dodge cummins revving to 7k but not sure if thats true .
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Old 06-24-2009, 06:46 PM
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From what I hear you wil need better internals to accomplish this. Valve springs, rods, etc.


maybe Dirk will chime in and clear this up for ya
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Old 06-24-2009, 06:51 PM
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u will know when u have gone to far lol
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Old 06-24-2009, 06:52 PM
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Originally Posted by 00strker View Post
u will know when u have gone to far lol
lol yea just listen for any strange noises, such as your valves floating
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Old 06-24-2009, 06:55 PM
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there was a guy on PSN that said he was running close to that. Not sure what the numbers were though.
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Old 06-24-2009, 07:20 PM
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Thanks Guys i know that much that i hear walves dinging holes in my pistons
I been lookin for some real data but cant find it anywhere im considering a custom tune just want to be ready with internal upgrades when it comes to that , i dont tow truck is just my toy and i drive it with iron foot i enjoy the torque of diesel but i would like my gears to have little wider range if higher rpms will be too far out of my reach i will consider gear swap to 3 73 or 355 dont know yet got to do little researching any hard data will be graeatly apreciated !!
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Old 06-24-2009, 07:31 PM
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Originally Posted by taylorking View Post
lol yea just listen for any strange noises, such as your valves floating
dirks the perfect person for that lol
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Old 06-24-2009, 07:43 PM
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Depending on the tune, internals turbo, etc... you plan on doing, wouldnt 4500rpm throw you back to the lower side of the torque curve?
I cant remember exactly at what RPM the torque is peaked on a 7.3L, just a thought though. Does anyone know the #?
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Old 06-25-2009, 06:38 AM
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Quote:
Originally Posted by Dieseltorkin View Post
Depending on the tune, internals turbo, etc... you plan on doing, wouldnt 4500rpm throw you back to the lower side of the torque curve?
I cant remember exactly at what RPM the torque is peaked on a 7.3L, just a thought though. Does anyone know the #?
I think it's around 2500
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Old 06-25-2009, 07:03 AM
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no need to go that high on a diesel,diesel make torque at low rpms and that is the part of the reason they last so long-higher rpm means lower engine life.to make a powerstroke rev at 4500 rpm is useless and expensive unless you are competeing and have money to keep replaceing expensive parts.
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