Caterpillar power harness

**07-379Pete** · 03.24.2010

Originally Posted by Jfaulk99

The fuel temp wire is a 150ohm resistor that's good for like 40hp, there is a boost wire mod but it only speeds up turbo spooling and makes smoke, no improvement in hp.

Both can be done for about $5.

With my fuel temp wire I gained 26 hp. Made a pull on the dyno without it and another one with it and it was a gain of 26hp with my current ECM setup. But for 35 bucks thats a cheap hp gain.

**RALLYTONY555** · 03.25.2010

Originally Posted by 07-379Pete

With my fuel temp wire I gained 26 hp. Made a pull on the dyno without it and another one with it and it was a gain of 26hp with my current ECM setup. But for 35 bucks thats a cheap hp gain.

Is that a C15 Acert @550hp?

26hp at the wheels is a good gain for small $ like you said.

It's great info. I have only ever guessed at the power increase.

Tony

**Diesel007** · 03.27.2010

What size resistor is needed for the turbo boost and where does it go? I just want to try it out to see what is gonna happen. Then I'll decide to leave it there or not. Thanx in advance.

**SpeedRacer** · 03.27.2010

I can't tell for sure if I got a power gain from it as I did it at the same time as disabling my wastegate. I definately got more power and better spool between the two.

I can say one thing for sure, it seems to have thrown my dash fuel and mpg #'s off a bit. Mine was pretty accurate, but now I'm adding a few more gallons per fillup than the computer shows burnt.

**Diesel007** · 03.27.2010

I'm not really worried about MPG. I drive a log truck in the woods. The truck never sees a paved road. I would just like a little more power.

**sulltran** · 03.27.2010

Originally Posted by 07-379Pete

With my fuel temp wire I gained 26 hp. Made a pull on the dyno without it and another one with it and it was a gain of 26hp with my current ECM setup. But for 35 bucks thats a cheap hp gain.

At what temp was the fuel when you dynoed it?

As actual fuel temp increases, the gains with the resistor are diminished. If the fuel was already pretty warm from hard running when tested ,actual gains would be more with cooler fuel.

**07-379Pete** · 03.27.2010

Originally Posted by RALLYTONY555

Is that a C15 Acert @550hp?

26hp at the wheels is a good gain for small $ like you said.

It's great info. I have only ever guessed at the power increase.

Tony

475 rerated to 550hp

**07-379Pete** · 03.27.2010

Originally Posted by sulltran

At what temp was the fuel when you dynoed it?

As actual fuel temp increases, the gains with the resistor are diminished. If the fuel was already pretty warm from hard running when tested ,actual gains would be more with cooler fuel.

True the gain would be more if the real temp of the fuel is cool, but in the real world your fuel aint gonna stay cool vary long while running at road speed. I never checked the actual fuel temp before putting the resistor on, but the truck set over night and I put the resistor on after the 3rd pull on the dyno. Just guessing at the actual temp might have been mid 90's to low 100's degrees at best, with the resistor on the the temp shows 161 degrees.