I've seen the modification where the two fuel rails are tied together on the PSD. I have a few questions...

Has anyone done this? What did you gain/achieve?

I know PSD mechanics and Navistar guys read this board too... is there a "problem" doing this mod? i.e. will it harm the engine or void the warranty etc...? Along those same lines, do you think it's just snake oil?

My goal is to quiet the engine a bit. I recently drove a different '02 PSD, running the same superchip program I'm running, at idle both sound about the same, but the other truck is noticably quieter in the 1200-2000 RPM range... probably 20% if I had to put a value on it. While I don't think my truck "cackles" it does run loudly.

OR would I be wasting $50.00?

Robert

 

The connection you are talking about does not connect the fuel rails together. It connects the high pressure oil rails together.

What it does is ballance out the pressures in the oil rails that run to the injectors. Mine connects between the ports on #6 and #5 cylinders.

Does it work? YES!

Is it hard to do? NO! Takes about 1/2 hour.

Is it worth the $50? YES!

 

Concur with rlarkin......this is a mod that does what it claims. I paid 50 bucks at Innovative Truck Products;
http://www.innovative-truck-products.com
There are others that are routed under the turbo.... Have Fun!

Voyager

 

Ahh... right... oil rails... now... is there an argument for routing over vs. under the turbo?

Robert

 

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First off, the H/X "mod" is not the fix the cackle. Remember, MOST powerstrokes do not have cackle.... if segregated oil rails caused cackle, wouldn't they all have it?

It didn't do anything for my engine, and you should be skeptical of all the claims. No offense to anyone, but many of these "mods" are designed by people trying to fix a certain problem, and taking a shot-in-the dark with unproven theories. They get a certain result with their engine and then form a conclusion that "hey this product fixes everything!" Yes, there are charts and graphs all over the internet showing the "better" readings from the ICP sensor, but that doesn't prove anything. I suspect one of two things is happening:

1. (Most Likely) The effect is psychological, just like the massive HP gains people report from aftermarket air filters.

2. These people have leaks in their HP oil system (common). It needs to be 100% leak free to work properly, and in fact the system is designed to hold full pressure (3000psi) for several days with then engine off. Any leaks will cause erratic readings at the ICP sensor. Adding the crossover kit may mask the problem. Fixing the leaks would be simpler.

When I installed mine, I tested my system for leaks at 3000psi before and after the install. Pressure held for 24hrs before and after. I measured the sound level before and after with a Simpson dB meter, and it was the same. One morning I started my engine and *swore* that the engine was quieter... I mean, I really wanted this thing to work. So I grabbed the meter and took readings, and it was actually LOUDER than my average readings. Turns out I had parked in a spot away from some buildings so there wasn't as much reflected noise (and yes I did move the truck to a controlled location to take the measurement). Idle knock is still there too. No change in peformance or mileage at all.

The H/X kit was an inexpensive experiment and although it didn't do anything, at least it looks cool. I got it from Dennis at ITP, real nice guy. His product uses a better hose than the Tymar and all others by the way.

 

Quote: LW555:
...the H/X "mod" is not the fix the cackle. Remember, MOST powerstrokes do not have cackle....

True, it is not a "cackle fix", but it does help lower the noise. Not off idle, but while at speeds the engine noise is usually noticably quieter.

Quote: LW555:
It didn't do anything for my engine, and you should be skeptical of all the claims. No offense to anyone..

No offense taken, and I hope you do not think I am confronting you in any way either.

The performnace effects from this mod are varied according to the factories ability to match your injector volumes. If you have balanced injectors you will notice very little. If you have a weak #8 you will notice nothing. If you have a strong #8 you can notice a difference. Not in just seat of the pants "butt-o-meter" readings, but I have seen an increase of egt coupled with better pulling power in a couple trucks. Although most guys see no performance benefits, most will acknowledge quieter engine operation, just not at idle.

Quote: LW555:
...got it from Dennis at ITP...His product uses a better hose than the Tymar and all others by the way.

Looking at the specs on the hoses and the application data, that is not true. While figuring the application data you have to account for pulse rythem and not full flow. You will go back and forth between the rails which can build more heat than directional flow. The ITP 90° fittings will also build more restriction, which will cause less flow and more heat. Depending on the programming of your chip, or the status of your ICP sensor mod, you can run continuous 2900 psi +/- 400 psi with rare occasional spikes to 3800 psi to 4000 psi. Temp rating should be over 320 degrees.

 

>Quote: LW555:
>It didn't do anything for my engine, and you should be
>skeptical of all the claims. No offense to anyone..
>

My situation is, I already know there is something different about the setup of my engine that causes it to be louder than some others. Of course the dealership "can not duplicate customer concern" and has never heard of a loudness problem with PSD's, though they did admit the engine seemed louder than the F250 PSD next to it. I really don't know what to do about it if anything.

What I do know is at 1200 RPMs I could pick my truck out of a line up of other PSD's blind folded. Diesels are supposed to be loud, yes, but I can't hear the radio or carry on a conversation while driving along until I lift from the throttle.

It's louder at 10k than it was at 1k. I've swapped fuel and added additives changed the program... the sound alters, but she's still loud.

$30.00 is cheap enough, even if it does nothing I can point under my hood and make up some proud babble about how "I did that mod myself" :-)

Now... I could put a high pressure shutoff valve in the line so I could operate it both ways (closed=stock open=mod) and do a little extended creative testing.

I also need a sound meter, anyone know where to get a cheap db meter?

Robert

 

[updated:LAST EDITED ON 11-Sep-02 AT 05:04&nbsp;AM (EST)]When the engine is running on the dyno the left bank cylinders always have more power than the right bank cylinders (on an engine that is running correctly) because that is the side that the ICP is in. If you install an ICP in the right bank and run a jumper to the wiring harness connector, that pattern will reverse itself. If you connect the two high pressure rails together, it evens the power on each bank. But, it has no effect on overall horse power and, as far as I know, it has no effect on noise. The engine seems to run a little smoother with the two banks tied together (just my opinion).

 

Not to sound like an a-hole, but what does ICP stand for? Back in my laboratory days, it meant inductively coupled plasma. It was a type of detector for a chromatograph, if I remember those hazy days correctly.

So what does it stand for in the diesel truck world with respect to the high pressure oil rails? Pretty sure I have the knock in my, er, our (me and the fiance bought it together) 01 F250 CC, auto, 3.73.
From what I understand it's more of an annoyance and is no harm to the engine. Still, I like to know what's going on and why.


Thanks,
Sud-z

 

Injector Control Pressure sensor. Mounted on the drivers side head, a the #2 hole.
Three wires. Voltage in, signal out, and ground.