Cheep ponys for an HDJ81!!

[onefsatchevy]

Well after talking with Dan over at 4wheelauto.com he convinced me to try a "power rod" - actually a metering rod for the injection pump - and WOW, a noticeable improvement. Defenatly has more pep. But really i am after better millage, will keep you posted if it helps. Dan figured it would give about 20+ extra ponys and a few (2 or 3) MPG.

Took about 15 min to install and cost $275... if the 20hp number is true just under 14 bucks a hp is wicked cheep in my books. He also said you would notice better gains if you tune the turbo (get more boost I think)... Any one know how to do this??

Happy wrenching... James

 

[brownbear]

Take some pictures of this....

I wonder if it increases EGT?

IMOP increased power usually increases fuel consumption. SO please let us know.

 

[Otterav]

Hey,
More power requires more fuel, the laws of thermodynamics will not be bent for advertising sake.
Enjoy it anyway!
eric

 

[onefsatchevy]

Actually increased efficiency and better mixture can create more ponys too... along with better milage. Alot of "power adders" will give you better mileage, although most people never see them because of bad driving habits (most people seeking more power are doing so because they like to use it all the time, and can't keep their foot off of the floor boards). Look into throttle body spacers for gas motors, no change in fuel (because there is no mod to the fuel system) but an obvious increase in power, and better millage (the 3 I have done all gave about a 2 MPG gain and probably 10 hp).

Sorry no picks... the part goes inside the fuel pump. and is only about 3 inches long and a 1/2 inch in diameter... picks wouldn't show much other than a dirty fuel pump!!

 

[mac]

Your injection pump already has a metering rod. The one that's now installed most likely allows more fuel to flow. The only way to change the "mixture" on these engines is through turbocharging changes, i.e, boost control, intercooling. When you make changes to the IP for more power you are simply adding more fuel. Do you have an EGT gauge? I'd be willing to bet that your EGT's are high.

Check your fuel economy through a couple of tanks.

 

[brownbear]

Actually increased efficiency and better mixture

Forget the word "mixture" with a diesel. It constantly varies depending on your foot. Where a gas engine uses mixtures all time consistently.

More fuel on a diesel make more power, simple. It also makes more heat regardless.

More fuel on a gasser can make it lose power and run cooler.

Gas/diesel theory is quite different that way.

More fuel in a diesel and the engine speeds up.

 

[diesel junkie]

The OEM rod has a quite a range of adjustment anyway, wont change max fuel but will wake up the turbo earlier in the rev range at the expense of a little more black puff.
Cant say more air earlier compensates for the extra fuel off idle though.

 

[onefsatchevy]

Didn't know about the mixture thing on diesels.... I obviously a gas guy until now, just saying that more power doesn't necessarily mean more fuel. Things like better exhaust, free flowing intake and an intercooler can all make more power with out more fuel. just my $0.02

 

[brownbear]

Didn't know about the mixture thing on diesels.... I obviously a gas guy until now, just saying that more power doesn't necessarily mean more fuel. Things like better exhaust, free flowing intake and an intercooler can all make more power with out more fuel. just my $0.02

Yes that is true. But a meter rod in the fuel isn't any of those things.

Increasing boost on the turbo can be more power with out increasing fuel as well. As it will use the fuel there more efficiently.

 

[Tapage]

Much people simple adjust the boost pressure ( way boost controler, manual or electronic ) and feel ( maybe get ) more power ..

Also if you replace your normal factory exhaust with a straight pipe withgout muffler and more tube diameter, get more power . ?

Maybe not .. propbable you gonna get more boost soon with less EGT .. you feel more power .. maybe yes.

 

[lowenbrau]

So are you running a pyrometer?

I'd be interested in the effects on EGT. At first blush it seems like anything you do to the pump without adjusting boost is going to give power at the expense of smoke and higher EGTs

 

[onefsatchevy]

No smoke, still runs like a dream, but haven't got an EGT meter yet.... coming soon.....

 

[roscoFJ73]

Hey,
More power requires more fuel, the laws of thermodynamics will not be bent for advertising sake.
Enjoy it anyway!
eric

x2 nothin new under the sun

 

[Dougal]

No smoke, still runs like a dream, but haven't got an EGT meter yet.... coming soon.....

You shouldn't be playing with fuel levels without an EGT gauge. Anyone who does pump mods to someone elses vehicle without monitoring EGT's is making the owner play with fire.

Chances are you've pushed your EGT's into unsafe limits. You haven't gained any efficiency either.
It's possible to save some fuel if you can run a higher gear than usual, but that's it.

 

[mac]

Amen.

 

[onefsatchevy]

Well millage hasen't changed.... No improvement like I had hoped, but not any worse either.

Had a thought, and please correct me if I'm wrong here, but isn't the only way to get more fuel into the motor buy pushing down on the peddal? In my logic (very possibly scewed!) x ammount of diesel = x ammount of speed in a given gear.. It is possible that this rod will allow more fuel in at a given RPM, but only if you push on the peddal. It should use the same ammount of fuel at 100kph now as it did befor, just now if I want more power it's there.... Thus as long as my driving habbits haven't changed, neither should my EGT's or millage......???

 

[dieseldan]

Biggest improvement I've experienced with my 1HD-T has been the Aero Turbo exhaust system - these motors love less restriction and while I haven't seen any dyno results the difference was very noticeable to me. .02

 

[onefsatchevy]

What size pipe did you use??

 

[dieseldan]

3" Pipe - pretty much unrestricted front to back. Not sure if ATEB bent the pipes or sends them out but man what an awesome exhaust - not that it matters but the sound is amazing under load or at idle. I highly recomend this kind of mod.

Exhaust Kits, Exhaust Systems

 

[Dougal]

Well millage hasen't changed.... No improvement like I had hoped, but not any worse either.

Had a thought, and please correct me if I'm wrong here, but isn't the only way to get more fuel into the motor buy pushing down on the peddal? In my logic (very possibly scewed!) x ammount of diesel = x ammount of speed in a given gear.. It is possible that this rod will allow more fuel in at a given RPM, but only if you push on the peddal. It should use the same ammount of fuel at 100kph now as it did befor, just now if I want more power it's there.... Thus as long as my driving habbits haven't changed, neither should my EGT's or millage......???

With a diesel fuel pump, the amount of fuel injected may have nothing to do with your foot position. It all depends on the internal governor setup. So it is possible to reach dangerous EGT levels without your foot right down.

You are correct that the amount of power (hence fuel consumption) to push the vehicle along at your usual pace hasn't changed. But usually more power results in faster driving which uses more fuel.