Engine/Transmission (1994 - 1998) WOW! What a difference!

[Johnstra]

Man oh man, what a difference p-pump performance can make. To fix an oil leak behind my gear housing I had to tear a bunch of things off, so while I was at it I decided to have my p-pump calibrated. Turned out my pump was under-fueling. The spec (if I remember right) is something like 175-178 (I think that's ml/sec). My pump was only delivering 171. The guy working on the pump brought all barrels up to 178. Then he put in my #11 plate to tune for it specifically. He was pretty disturbed how poorly the pump fueled while cranking with this plate. We said it was less than half what the stock plate delivered. He suggested rather than use the #11 plate why not just bump the pump to 20% over stock delivery. So I had him do that and set timing to 15* and WOW Oo. I can't believe how doggy my truck was. So I'm running with the stock plate and my truck still runs way way better than it did before.

-john

 

[DBraunig]

Johnstra,



Who did the pump tuning for you? i am right not considering sending mine off to have it "set"



Dave

 

[Jeff H]

Crap! Can only imagine now what a 0 plate would do now?

 

[Johnstra]

DBraunig - Pueblo Diesel Injection (719-547-9611) did mine. I'd think you should be able to find somebody closer to you, but I'm very happy with PDI. They did a great job on the pump, they let me watch the process, and they helped me figure out how mI messed up my throttle linkage. Good guys.



Jeff H - No kidding, but that'll have to wait as my stock clutch would be very unhappy with that much juice



-john

 

[autoworld]

pump timing is crucial to performance and mileage - it can be done at any diesel service center!

 

[JGheen]

He suggested rather than use the #11 plate why not just bump the pump to 20% over stock delivery.

-john

I am curious to know what was done to get the pump to flow this 20% more over stock delivery..... Is this done with a gov. lever adjustment??



Joe

 

[Johnstra]

No change to gov. lever. All of the changes he made were to the barrel assemblies. I asked specifically if he adjusted the gov. lever. He said he would have it he'd had to, but it didn't need it. I didn't actually get to watch this part of the process. I know when he first benched the pump, I watched while he took the initial measurements. He was making adjustments to the barrels to get the pump to flow to spec (it was underfueling). Later, he made the same type of adjustments to raise the flow rates above spec. If I have time, I'll give him a call and ask him exactly how he did it. Never know, he might tell me.

-john

 

[AndyMan]

What does such tuning cost? If you don't mind the rudeness of my asking. Just ballpark? $100, $1000, etc?



I just went from a 3rd gen to a 96 with a 215 pump.



Thanks,

Andy

 

[Johnstra]

It cost me $450 (the shop's rate was $85/hour and I paid for a couple of seals). The shop quoted $350 to calibrate to spec. The extra hundred was time to bump it up. Definitely on the expensive side, but this was my big splurge till it's time for a new clutch.

-john

 

[BigPapa]

What does such tuning cost?

Andy,



I just talked to Ron at Taylor Diesel last week. If you bring the pump to them it costs $130 to test and tune. If it needs parts then your probably looking at quite a bit more.



Scott

 

[AndyMan]

Very good. Thanks for the reply.



Hey Scott! Oh yeah, I forgot that you had also been looking for someone to do pump work.

My South Bend FE will be here Monday, I'll put it in Tues night... hopefully the pump is fine, but I'd like to have it flow tested and tuned.



This 215 pump of mine is SUPPOSED to be bombproof, so hopefully it's good on parts.

 

[TLanier]

duh?

ok, forgive (and correct) my ignorance please.



what exactly is the p-pump what was calibrated? is this the same thing as my 215 p7100 injection pump?

 

[Johnstra]

Yes, p-pump == p7100. A diesel injection shop can put the pump on a test stand that turns the pump and measures its performance at various RPM. Calibration refers to measuring and tuning the flow rate of each barrel on the pump. Ideally, all the barrels output a consistent volume of fuel per some unit of time. The shop that did mine also calibrated the AFC by measuring rack travel versus applied PSI.



I had forgotten to tell them that I'd replaced the stock AFC spring and the shop called me and asked if I could bring in the stock spring because he could not calibrate to spec using the TST spring. After he calibrated with the stock spring, he put the TST spring back in and tuned for that.



-john

 

[JGheen]

John, did you ever find out what exactly your pump guy did to flow 20% more over stock? I am real interested to know what he did unless it is some trade secret that people get stingy with. :-laf



Joe

 

[Johnstra]

I never got around to calling. I'll try to remember to do that monday.

-john

 

[bmoeller]

Joe, it is pretty simple to do. BUT, you do need to have it on a test stand.



Inside, there is a rack with teeth on it, for every plunger. 6 in our case. There is a collar with teeth on it, that mates up with the ones on the rack. The collar is also a clamp. Loosen the clamp, and you can turn the plunger by itself. They all need to be turned to the exact same postion, to meter the same amount of fuel.

 

[TLanier]

thanks alot johnstra.



i figured as such, but you know what they say when you assume... .....



you had a #11 plate in, and now she runs better with the pump tuned and a stock plate??????



ive got a #11 too.



hmmmmmmm... .....