Simple VE pump question

[RSchwarzli]

The 1990 was an auto. Then I made it a stick. Fuel line is 2350 rpm and it then starts defueling like it drove off a cliff. I can max rev to about 2500 but not much power there.



First question: Were sticks the same redline from factory as the autos? If not, what was changed?



Thought two.



I picked up a 3000 g spring with the intent of installing it but then I got thinking (me thinking is issue number 1 :-laf)



From what I understand, the VE needs to be pulled off truck to install. If that is the case, would I be better picking up a modified VE that would also fuel more? I am at the upper range of the fuel screw as I had it about 180 deg turned in more but engine was just starting to walk away at 2000 rpm (hold 2000 for 3 seconds and rpms start to build quickly). So I backed it off for safety.



So I would say my HP is capped by the pump now correct? I wuld assume my stock 90 (9 mil) injectors are flowig enough fuel and the VE is now the limiting factor, no?



If so, would a performance VE be a smart choice? Any thoughts for more power and efficiency from my current set up? Anything else I can adjust?



Thanks.



Robert

 

[JLEONARD]

New injectors will flow more than the 9mm stockers. I had Bully Dog +50s and they made a big difference. PODs will make a bigger difference.

Have you modified the fuel cone? You can add some fuel that way.

You can move the high idle screw and that should get you a few more rpm before the defuelling point.

 

[ENafziger]

I picked up a 3000 g spring

Just for my learning benefit, what is a 3000 g spring?

--Eric

 

[RSchwarzli]

New injectors will flow more than the 9mm stockers. I had Bully Dog +50s and they made a big difference. PODs will make a bigger difference.

Have you modified the fuel cone? You can add some fuel that way.

You can move the high idle screw and that should get you a few more rpm before the defuelling point.

No fuel cone mods. Only mod is idle screw and fuel screw. Thats it as far as fueling goes.

Just for my learning benefit, what is a 3000 g spring?



--Eric

Mind out of gutter, I did not say G string. :-laf



G spring. The Arnold Spring. The Governor spring. Limits how high the motor revs by where the fuel is cutoff.





Sorry. My bad.

 

[Bob Beauchaine]

The limiting factor on the stock VE is controled by the gov. spring and was the same for all 5. 9s. Stock would defuel at about 2450 rpms. I used this stock setting to get two people through WA smoke testing. You can increase the high RPM stop so that when get to say 2800 rpms the truck is defueling so smoke is reduced. Using the 3000 GS will keep your VE fueling to about 3200 rpms.



You do not have to remove the VE to install a new governor spring.



The older heads '89 through 91? with the 9mm injector holes had a tendency to crack around those holes.



There was a recall on some of the older VEs due to a tendancy to "run away". My neighbors 91. 5 had a new VE - Cummins yellow - when he bought used.



I had Wentland Diesel in Milton-Freewater OR install a 15% turned up rebuilt VE on my '93. After the warranty was up I "tweaked" it some. You can see in my sig. what my best numbers are and what I've done since then.



Bob

 

[RSchwarzli]

Bob,



Really? I thought it had to be removed for install!? Where would I go to find directions on install? I can do a search but feeling lazy... .





So for the 15%+ pump, what does that mean exactly? 15% more fuel than stock?



No head cracks. Yet.

 

[GHarman]

VE sticky

How about this one? Good Luck! GregH



https://www.turbodieselregister.com...1-governor-spring-ve-info-threads-merged.html

 

[Bob Beauchaine]

I'm honored to say that I knew Pastor Bob. He was quite an individual and is missed by one and all who knew him.



I know that 15%+ means 15% more power and I do know how it feels! After the install we took the old girl for a ride and I was very impressed. A caution though BOMBing gets very addictive and a whole lot of fun. Oo. Oo. Oo.



Bob

 

[RSchwarzli]

How about this one? Good Luck! GregH



https://www.turbodieselregister.com...1-governor-spring-ve-info-threads-merged.html

Yes. That would work... ... Duh... . FAQ... . of course... .

I'm honored to say that I knew Pastor Bob. He was quite an individual and is missed by one and all who knew him.



I know that 15%+ means 15% more power and I do know how it feels! After the install we took the old girl for a ride and I was very impressed. A caution though BOMBing gets very addictive and a whole lot of fun. Oo. Oo. Oo.



Bob

Yes, never got a chance to meet the Pastor. I do regret that.



As for the VE, OK. 15% power. Got it.



And I know what BOMBing does..... you have seen the project truck and the list of mods on the DD right? The daily I said I would never modify? :-laf

 

[NIsaacs]

I second the Bully Dog 50's, they make a huge difference. There is only so much fuel you can squeeze through the stock injectors. You will notice a big difference in fuel screw movement with them. With stockers it takes several turns for more power, with the 50's a half turn is noticeable.



Nick

 

[JLEONARD]

No fuel cone mods.

Oh you have to do this. Made a really big difference for me and it was one of the last mods I did. Made it pull a lot harder in the low to mid range.

If you do a search you can find a thread or two.

A Dremel is all you need and a farily steady hand. Polish it to a mirror when done.

 

[cerberusiam]

Just for my learning benefit, what is a 3000 g spring?



--Eric

The rack in the VE is connected to the throttle shaft with a spring and the gov weights overcome the spring presure to defuel at a certain rpm. Adding a stiffer spring just moves the defeul point high in the rpm band.





Yes, the spring can be changes on the truck. Its much better with 2 sets of hands because little pieces have a tendency to fall into the pump THEN you get to practive removal and disassembly. :-laf If your careful, and more than a little lucky, you can do it on the truck by yourself.



Ultimately, the pump settings control defuel point and the total fuel delivery. Adding injectors, turning the full power screw, and adjusting the high idle really just pull the rpm limits up rather than push them. The defuel gets a blurred rather than moved.



Different CPL's for the different years had different defuel points and fuel delivery curves. To modify them you have to change the internal pump settings.



Then eventually you get to the point that the physical limitations of the pump get in the way. Even with shower head tips and max fuel in the pump about 2600-2800 it will start defueling.

 

[GHarman]

Not speaking as an expert here. I would try to talk to Dave Valentine. He did some mods on "New Ugly" that preclude defueling under 3000 RPM. He ground the fuel pin, turned up the pump, 30# spring, as well as other mods. I have not tried to operate the truck above 3000RPMs but have had no defueling issues as the RPMs are run-up prior to a shift. IMHO, the motor is presently operating as close to the edge of the capacity of the 1st gen driveline as I would want to push it. GregH