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Old 12-14-2005, 06:12 PM   #1 (permalink)
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Cat diesel power harness

Has anyone got any experience or heard any feedback on this product? Ratso's Fab Shop has them for sale. It is used on the 3406Es. TIA
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Old 12-14-2005, 10:40 PM   #2 (permalink)
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Re: Cat diesel power harness

Haven't heard of it.. What is it supposed to do, replace the stock harness??
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Old 12-15-2005, 01:26 PM   #3 (permalink)
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Re: Cat diesel power harness

It is suppose to plug in between the computer and the main harness to modify the signals from the computer to call up more fuel. They are suppose to actually smoke if you are starting off and "gas" on it before the boost kicks in. I read a little about it on Drivers round table forums. Suppose to be a substantial kick in the pants on power as well.
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Old 11-26-2008, 09:18 PM   #4 (permalink)
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It is suppose to plug in between the computer and the main harness to modify the signals from the computer to call up more fuel. They are suppose to actually smoke if you are starting off and "gas" on it before the boost kicks in. I read a little about it on Drivers round table forums. Suppose to be a substantial kick in the pants on power as well.
The company that manufactures that Power Harness and the Fuel Temp Harness globally is Platinum Performance based out of Atlanta. I bought several for my fleet and really noticed the increased horsepower and fuel savings. if you google them you will likely find them or at performanceharness dot com. They specialize in Caterpillar Diesel engine performance. I was surprised at the performance for sure.
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Old 11-27-2008, 08:44 AM   #5 (permalink)
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I have a friend with one, pretty much just extra smoke, no mileage gain, you can find the harness on eBay way cheaper than anywhere else.

There are 2 harnesses, one is for fuel temp, the other is for boost, can get them both for under $100.00 on eBay.
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Old 11-27-2008, 09:13 PM   #6 (permalink)
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I have a friend with one, pretty much just extra smoke, no mileage gain, you can find the harness on eBay way cheaper than anywhere else.

There are 2 harnesses, one is for fuel temp, the other is for boost, can get them both for under $100.00 on eBay.
You may get a very "Slight" or think you are getting a little bit quicker spool up.But it is mainly a smoke show as Mainiac said and underhood cackle LOL.It is Nothing more than a inline resistor.ACCERTS seem to respond a little better with them than Regular E-models.This trick is Nothing new and the Bang you will get IMO is not worth 50 bucks LOL !, Nor is it gonna give you a extra 2MPG.You can go the powerbox route, But throw caution to the wind there.Even though they may Have Built in EGT protection,I have pulled quite a few Heads off tks running them .The Higher cyl pressures are hard on the Headgasket.Driving style factors into this too.
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Last edited by grounder; 11-27-2008 at 09:44 PM.
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Old 11-28-2008, 01:22 AM   #7 (permalink)
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There are actually three harnesses.

Fuel temp: fools the ECM into thinking the fuel is hot and thin. The ECM Will actually compensate for the thin fuel and inject more per combustion event. This does Does work Fairly well. BUT as you drive and the fuel starts to heat up you will notice less and less power as the fuel gets hotter and hotter. A fuel cooler will help this a bit.

The second is the boost sensor: Fools the ECM into thinking boost is higher than it actually is. This will dump more fuel down low and spool the turbo faster. IT will however smoke down low and isn't good for motors still running the Oxy Cats

Third is Intake air temp sensor: this fools the ECM into thinking that the air is Colder than it actually is. The ECM will adjust the timing to compensate.

For the money their not a bad mod. But don't expect a night and day difference. Maybe .2MPG MAX.

They really don't do much on a Non Acert motor. The pre emissions 3406E's do better with injector trim codes and fuel tables. Good luck finding a dealer that will still fiddle with these though as mother cat will have your nuts if they catch you doing that without their consent.
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Old 11-28-2008, 12:59 PM   #8 (permalink)
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There are actually three harnesses.

Fuel temp: fools the ECM into thinking the fuel is hot and thin. The ECM Will actually compensate for the thin fuel and inject more per combustion event. This does Does work Fairly well. BUT as you drive and the fuel starts to heat up you will notice less and less power as the fuel gets hotter and hotter. A fuel cooler will help this a bit.

The second is the boost sensor: Fools the ECM into thinking boost is higher than it actually is. This will dump more fuel down low and spool the turbo faster. IT will however smoke down low and isn't good for motors still running the Oxy Cats

Third is Intake air temp sensor: this fools the ECM into thinking that the air is Colder than it actually is. The ECM will adjust the timing to compensate.

For the money their not a bad mod. But don't expect a night and day difference. Maybe .2MPG MAX.

They really don't do much on a Non Acert motor. The pre emissions 3406E's do better with injector trim codes and fuel tables. Good luck finding a dealer that will still fiddle with these though as mother cat will have your nuts if they catch you doing that without their consent.
I am a CAT Tech and I used to put Hot Trim Codes in and a few other things.... for "Freinds" as long as they were out of warranty.Anymore with roadside emission checks where the sniffers are put on the stacks and they will check opacity readings there could be trouble if this were ever to get into a court issue.Not likely but possible.The service tool serial # will be registerd in The ECM who made the last parameter changes.So if they really wanted to push it they will come back to the dealer and then you are in Hot water With Federal EPA issues, so I do value my job and pretty much do not do it anymore The warnings to Us Dealer Techs are pretty Ugly on this nowdays..Any warranty work on any CAT engine requires a report and a ECM download which you send to CAT.If you are running a powerbox on it,It still can be detected by Caterpillar.They will kick the warranty claim back to the dealer and possibly Flag the Engines remaining coverage .Trust me they Know every "Mod" in the book that people figure out to squeeze some more juice out of thier engines and you are Not going to fool them if thier is a warranty repair and you have been tampering .Actually they are very Lienient on covering warranty claims and thier customer service and goodwill repairs with Failures just out of warranty coverage are definately "Second to None". But thier is a point where you will get into trouble if they see something in a ECM parameter that throws up a Big Red flag that you have been altering things..CAT will program you a Hot ECM I know many guys with pulling tks that have them.You have to sign alot of documents stateing it is "Off Road use only".It will also cost you around 3 grand for them to do it for you.Obviously its your baby if you scatter it.But really no one knows better than them what thier engines will take.They sponsor plenty of race tks in the US and Europe running thier power which IMO is pretty cool on thier part.
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Last edited by grounder; 11-28-2008 at 01:23 PM.
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Old 11-28-2008, 03:19 PM   #9 (permalink)
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Emission stuff suck.

Sniff.... can't even go out and play anymore....
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Old 11-28-2008, 07:17 PM   #10 (permalink)
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You can go the powerbox route, But throw caution to the wind there.Even though they may Have Built in EGT protection,I have pulled quite a few Heads off tks running them .The Higher cyl pressures are hard on the Headgasket.Driving style factors into this too.
I have another friend who used the power box, after 2 head gasket jobs he took it out, never could turn it past 3 or it would get too hot, waste of money IMO, just buy a bigger motor, thats what I did
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Old 06-12-2009, 11:13 AM   #11 (permalink)
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NEW HERE

I just purchased one of these power harness. For the fuel sensor.
Had it on the dyno. So it works, got good gains. Two months later
seemed like betsy was lagging. Re dyno. Computer was smart and
figured out was there. pretty mad that i wasted my money.

Found a shop that builds one. That actually works it's not just a
resistor, it's actually programmed so the computer doesn't see it.
same gains. have had, six months and still pulling.
wont leave a trace in the system.
Also found a shop that fine tunes the trim codes. My fuel spread
was 6% before they tuned it they got it to 0.8%. they also did a
valve set.
and then got it on the dyno a few weeks later.
Was at 477 before everything.
510 with the harness.
580 with tuned codes.

Thought you should know
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Old 06-13-2009, 10:37 AM   #12 (permalink)
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So where do you put that inline resistor instead of buying one of these things? :P
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