Those of you out there with the #9 resistor what did you guys experience after installing. Any noticable gains, etc.

Thanks, Jacob

None that I could tell. Went from a 5 to a 9 then a 7 which is what I have now.

Told Ya ;) same as in PM guess you didn't believe me :D , fine, be that way:D

Jake there really is no inexpensive way to more fuel, plus you gotta remember it's not just how much fuel but when you get the fuel, so a reflash not only enables more fuel to be requested from the IP than what stock is asking for but it sequences the start in in jection timing curve so that when extra fuel comes it is at proper timing in relation to open/close of valves so you get good ignition of the fuel and not just dump in gobs at wrong time resulting in mediocre performance or EGT issues

I believe you TD, I was just looking for some opinions from other people who have tried this. I emailed Walt at SS diesel and he said "Hi Jacob,

Yes it will make a difference on a stock truck.
For the $20 or so, its probably the best
performance mod for the money."

Jacob

The way I ended up with a #9 was I bought the PMD from SS Diesel which came with the #9. Maybe there was more fuel but my butt (all 220lbs or 100kg for the guys way up North ;) ) didn't feel a change. Don't get me wrong I really really like Walt. I still buy stuff from him and have sent others that way as well. However in IMHO didn't see or feel a difference with the #9 over the others.

Maybe try the "Optic Bump" I did see / feel a change after doing that. But like TD said a chip or re-flash is where you will really see a change.

I think I would do the feed the beast before the optic bump, seems to be kind of safer so to speak in that you aren't moving anything, or can't really throw anything out of whack like when you are trying to move this little sensor millimeters.

Don't know if you understand what I am saying but.

Jacob

Undertand. PM on the way.

I believe you TD, I was just looking for some opinions from other people who have tried this. I emailed Walt at SS diesel and he said "Hi Jacob,

Yes it will make a difference on a stock truck.
For the $20 or so, its probably the best
performance mod for the money."

Jacob
my butt dyno didnt feel a change either but you coudl see a bit more smoke out the exhaust pipe.

I also put a #9 in with a remote PMD from Walt on my '98. I could feel a slight more torque off idle but not very much. The wife didn't notice it, but I drive it alot so it was noticeable to me but very very slight. I then took off the remote PMD and put it on a guy that was broke down here and I went back with a stock resistor and I could feel the slight loss. The only thing I did notice more about the #9 was I lost on the average (over 40,000 mi.) about .6 MPG. It came back with the stock resistor. Went from 19.2 to 18.6 or so. My .03 worth.
Regards, Jeff

As I understand it, the resistor is used with a new or rebuilt IP to calibrate the fuel flow to stock levels... so, if your max fuel is 60mm3, and your IP only puts out 57mm3 with a #7 resistor, you would get a #8 resistor to raise the fuel flow (by 3mm3) to stock levels. If your IP was putting out 63mm3 with a #7, they would change it to a #6 to lower it to stock levels.

That means... if your IP already has a #8, putting a #9 in it will make darn-near no difference. (3mm3 max fuel flow difference) If you had a #3 in it, then you might notice something more significant. (18mm3 max fuel flow difference).

Did I miss anything, or get something wrong on the theory part here, Tim or JD?

Theory aside, my original pmd had a #5, my Heath replacement has a #7. I noticed a very slight difference (or maybe I just THOUGHT I noticed a difference, because the thing wasn't stalling every 50 feet)

Did I miss anything, or get something wrong on the theory part here, Tim or JD?



That is about the gist of it, also assuming IP & injectors are up to task, plus say all things are tight running a Nr 5 as from factory fresh 0mm +/- change, one might normally cruise @25mm delivery, adding a 9 might get you to 29mm for a +4 change,.

But if rpm goes up beyond factory PCM tuning it could retard fuel asked for, only time you would see benefit is on acceleration for a short time, then once PCM no longer sees request/need to be at max fuel delivery fuel rate will drop back to what PCM sees is needed to maintain requested speed.

Which is why a reflash or rechip is in order to a allow for more than factory during acceleration 80mm+ vs 56mm(S) or 63mm(F) plus rechip/flash will have better than GM cruising fueling/timing/boost schedules, mpg may even improve if one could keep thier foot away from the new found power I can't :D so I pay more in lost mpg for my fun.

22-24 mpg is what my burb is getting with reflash-4" pipe- and mandrel crossover 3:42 rear 70-75mph would be better if I could learn to run 60-65 but that ain't happening on my shift

No noticeable gain for me....mind you, it is hard to tell any gains on a 19 second truck....