Low RPM governor speed

[Steven Donald]

Can anyone get me clarity on this? I believe the smaller spring is for setting governed IDLE speed. And the larger one is for setting governed max rpm. So... I've gotten direction to cut and stretch both of them back and forth now and I'm confused. The 6.2/6.5 spring people put in to RAISE max RPM must be to replace the larger spring. Is it LONGER than the 7.3 spring? Or is it SHORTER?

 

[Steven Donald]

I really want to make an adjustment this afternoon. Thewespaul, can you clarify once again? I don't want to make the wrong change.

 

[Thewespaul]

You can cut the short spring to make a more extreme adjustment, and you will have to adjust the idle screw to compensate. Do you have a spare IP you can rob parts from for peace of mind? If not I wouldn’t cut anything yet, stretch the longer spring out and see if you are happy with the adjustment, make sure your rpm limiting screw on the throttle bracket is backed all the way out. If you decide you want more rpm after that, I would then do the 6.2/6.5 spring then if you want more still look into cutting your small spring once you have a spare.

If you don’t have spare parts I think it would be better to exhaust all the mods that are reversible first then step it up from there.

 

[Steven Donald]

OK, when I cut the small spring, I then turn the nut adjustment in towards that small spring to keep the idle the same? Or does that adjustment not work like I'm thinking?

 

[Thewespaul]

Idle adjustment on the throttle bracket, it should just be a lock nut and flat head for the adjustment, I wouldn’t mess with the short spring quite yet tho

 

[Steven Donald]

Oh man, I need help, lol! I pulled it apart and stretched the large spring about 1/4" longer and put it back together. Now it idles at 3,000 rpm!! I pulled the idle adjustment all the way down and screwed in the electronic idle solenoid and it didn't make a difference. Then Inipebws it up again and "loosened" the large spring, compressing the small spring and nada... Still 3,000 rpm. Any ideas?

 

[Thewespaul]

I don’t think your seated in the notch correctly then, is the throttle smooth when moving it by hand with the engine off?

 

[Steven Donald]

Nevermind, I went the wrong way with the nut. Back tonidling right!

 

[Steven Donald]

Woohoo!!! 3,700rpm redline!!! AwrsAwe, thanks for all the help!!!!!!

 

[Thewespaul]

This is the notch I’m referring to,

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did you mark your governor adjustments before disassembly to be sure you got it back to where it needs to be?

 

[Thewespaul]

Awesome! Glad to hear you got it right. Gotta love free upgrades with mechanical fuel systems

 

[Steven Donald]

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[Steven Donald]

It's hitting 15 psi from 2,600 to about 3,250 then tapers back off. Think that looks and sounds like it's well enough tuned?

Used to it would fall on it's face right at 3,000rpm, so you had to short shift and the turbo would de-spool a bit. This is way better, keeps the engine in the power band MUCH better!

 

[Thewespaul]

That sounds normal, by design the stock pump looses efficiency at those higher rpms so you will not have as much fuel up there

 

[Steven Donald]

So, the adjustments I made to the IP seemed to retard the timing quite a bit, it was running crazy quiet. I advanced the timing a bit more and took another test drive. This is the fastest IDI I have ever been in. Check out this video.l, I started in 2nd and went 0-60 in about 8 seconds. Not bad for a huge diesel, 4x4 extended cab long bed from 1991!!!

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Thanks again for all the help Thewespaul!

What type of horsepower do ya think I'm making? 225?