hey guys, im new here, just got my 99 dually, and have been bit by the bug,

whats the deal with the #9 resistor? does it work?

im just looking for real world reports..

the truck is so far stock, aside from an SS relo/cooler

I just found out that the #9 isnt the best actually, the #7 was made for emergency vehicles only and is the most fuel... #9 provides more fuel at lower RPMs but actually a percent LESS at higher RPMs... as in like cruising/accelerating RPMs...

by the way, your SS kit is going to fry the PMD again, whether walt wants to admit it or not. Buy an extension harness and move that OUT OF THE ENGINE BAY. (Trust me from experience) all you need is an extension harness, since you have the heat sink already. the harness can be had on the auction site for 40 bucks.

I just found out that the #9 isnt the best actually, the #7 was made for emergency vehicles only and is the most fuel... #9 provides more fuel at lower RPMs but actually a percent LESS at higher RPMs... as in like cruising/accelerating RPMs...

by the way, your SS kit is going to fry the PMD again, whether walt wants to admit it or not. Buy an extension harness and move that OUT OF THE ENGINE BAY. (Trust me from experience) all you need is an extension harness, since you have the heat sink already. the harness can be had on the auction site for 40 bucks.


i was thinking about the extension.. but have a question, wouldnt the extension increase the resitance cause of the longer wiring? so in theory if i have a #5 in there, increasing the res with longer wiring would up it to a 6 or 7? wouldnt it?

is it really? the Norm is a number 9. where do you think i would be able to get ahold of an extension harness with a #7 resistor in it? the warranty is coming to an end for the IP/PMD on my truck so im going to want to replace the IP/PMD one last time before it ends and this time put the pmd remote mounted behind the bumper on a big ole heat sink.

well.. for what its worth, i rarely rev it past 2200-2500, so would the #9 benefit me? and how big of an inpact would it have on fuel economy, not that the 2 go together, perf and eco.. but just curious, i recently made a 510 mile trip on 1 tank

norm is not 9, norm for each truck/tranny/vin/etc is different. I think Heath sells the #7... the resistor goes into the FSD/PMD, not the harness... and no, when you increase harness length you do not increase the "resistor value" because they don't work like that. THere is no performance difference between a PMD/FSD and a harness and one on the pump, until the one on the pump stalls, then there is a MARKED performance increase :D. I have an extra extension harness i'll sell for less than the auction site as well if either of you are interested.

norm is not 9, norm for each truck/tranny/vin/etc is different. I think Heath sells the #7... the resistor goes into the FSD/PMD, not the harness... and no, when you increase harness length you do not increase the "resistor value" because they don't work like that. THere is no performance difference between a PMD/FSD and a harness and one on the pump, until the one on the pump stalls, then there is a MARKED performance increase :D. I have an extra extension harness i'll sell for less than the auction site as well if either of you are interested.


ok, ill gve it a shot.. pm'ed ya

2200-2500 RPM is what I mean by high rpm... the #9 benefits are gone at something like 1400 RPM... whatever it is it is well below the peak torque or peak HP

2200-2500 RPM is what I mean by high rpm... the #9 benefits are gone at something like 1400 RPM... whatever it is it is well below the peak torque or peak HP


no sh*t!!!! ok, that kills that.. so what should i be looking for? the 7 from heath??

btw..
i am planning on a 4" all the way back, a 3" mandrel down pipe, 2 1/2 crossover, and a programmed ECM, any further recomendations?

KEEP YOUR INTAKE STOCK! Heath is supposedly going to come out with a CAI for the 6.5s... SOMEDAY... so I'll wait to pass judgment on that... but all the aftermarket kits for 6.5's aren't that great... especially the SS Diesel one... Mine is now a hybrid modified SS Diesel that is a TRUE cold Air Intake, but that is by my own engineering, not Walts. with those modifications you stated you should be looking at a nice riding truck, i'm very happy with my mods. the cheapest ECM for OBD-II trucks is the Heath GL-4 or GL-E... I have GL-4 and LOVE it, along with almost everyone else that has it.

well what i mean was around here the number 9 seems the most common. mistype/misunderstanding but its all good.

well shoot im def. going for the number 7 now. if ghost doesn't buy the extension harness from you there maine i just may take you up on it.

as for ghost and your exhaust plan -
-SS diesel seems to offer the lowest cost, as well as being a 2 piece design making it incredibley simple to install. the downpipe im not so sure about but there are plenty who will be hapy to give you a hand there. as for the PCM. heath does a goodjob with his as i see alot of them and have yet to here a complaint. the difference between his 2 PCM's is actally only within the last 25% or so of the throttle response. so depending on what you want throttle wise is on you.

Warpspeed is the cheapest I think for x-over, but like BigBlueChevy said, the 2 piece design is very nice. the SS is the only one I know of that is STAINLESS which is really awesome. most good 4 inch kits include a 3 inch downpipe... mine came off of the auction site for 300 bucks SHIPPED from MKO Power. I love the system, has a muffler, fit well, nice thick pipe. I'm the only one I know of with this system, but I know there are more out there! If you want a stainless 4 inch system, SS is the only one i know of that offers it and its a pretty fair price. All SS exhausts are HearthThrob exhausts resold by SS

Sorry BBC, Ghost jumped on that harness almost instantly.

most everyone on this site has a #9 risistor that is why I have a #9 now you are telling me the #7 is the best?:eek:

Pretty much, no matter what number resistor you have. You will not "feel" any difference in power. You may not even see any difference in power between 5,7, and 9.

I have a #9 in mine (was already in there i didn't put it in) and i don't think i would see a difference if replaced it with a #7...

The difference in Maximum fuel delivery between #1 and #9 is about 3%

The resistor selects the fuel rate table in the ECM. The adjustments in the table for the % load difference in each table.


It depends on how you drive and what you need. If your on Highway and empty, you wouldn't see much difference in MPG. Around town in stop and go, a heavy foot will cost you money with a higher resistor. (what I've seen)

Keep in mind that, it takes a certain amount of fuel to maintain a specific speed. So changes in the resistor change the percent of load seen in the computer. (meaning, higher number less pedal input, lower number more pedal input.)


Now if you pulling a trailer or carry a lot in the truck, then you'll notice some difference. But the change is small.


Currently, I have a #9 and #5 resistor. The #5 is installed. Around town it saves me 1/2 mpg over the #9.

I've looked at buying a #1, just haven't paid the $20 for it.