The 5/19/2008 Dyno Day at Meridian Motor Sports was my first dyno event and I had a blast.

Don was very helpful with his instructions and suggestions on what to do once on the rollers. The dyno he has in his shop is a DYNOJET. That's all I know about it.

I want to start out by saying: my truck is mostly in stock condition - mods (what little there are) are listed in my signature. I also believe I have some torque converter slippage and am in the process of correcting that. Also, since this was my first time on a dyno, I was a little hesitant with the go-pedal.

Prior to the Dyno Day, I was running the 14.7K combination. My mileage increased to 17.7 MPG. I am now running the 20.3K combination and haven't had a chance to calculate mileage yet. When I filled my tank yesterday, mileage calculated out to 17.02 MPG. This included (about a week or so) running with the 14.7K, then the Dyno Day testing, and switching to the 20.3K combination before filling the tank to start mileage calculation.

The numbers listed below were obtained in the 2100 RPM - 2600 RPM range. I ended the runs between 3000 RPM - 3200 RPM. Like I said, my truck is stock and there was no increase in numbers. The numbers were actually dropping off after 2800 RPMs.

Here are the numbers I produced using the different resistor combinations with my truck:

Stock 137.9 / 310.3 16.5 MPG
4.7K 130.9 / 310.3 N/A
5.6K 142.2 / 334.5 Not calculated
10K 126.1 / 288.5 N/A
14.7K 163.0 / 340.7 17.7 MPG
20.3K 168.7 / 398.4 Not calculated
25K 126.7 / 297.7 N/A

I was having so much fun, I didn't even consider the 15.6K combination. Maybe next time, and there WILL be a next time on the rollers. What this tells me, for my truck, the 20.3K is the best combination at this time. I need to make up additional combinations for the next Dyno Day. Looks like I'll be heading back to Radio Shack for some performance parts.

I expected a numbers drop with the 25K, but notice the drop with the 4.7K and 10K resistors. What this also tells me is...each truck WILL respond differently to the different resistor combinations.

 

Very good info! thanks! Tried to rep but I have to spread the love!

 

Great info. Reps sent to ya.

 

On that note. I was running a 15.6k the other day on the highway and I got avg about 17.7 mpg.
Also, had problems with truck surging while at highway speeds and later with a hot motor and driving around town. I thought it was the CPS and posted on that issue.
Tach was moving with cranking.
I pulled the whole ICP mod and went to a stock configuration.
Haven't had a problem since.
I think i need to re-crimp my resistors.
Also have had an oil leak at rear pass. side head where HP oil line feeds into head.

Did the increase in oil pressure blow this gasket/ o-ring?

 

were the resistors hooked up c00ns way or the other way

 

You may have had a bad connection with the resistors. Thats one downfall to the 10K mod. If your connections aren't perfect it affects the engine performance. On the leak, the pressure could have exposed a weak o-ring but not caused it.

 

I should have mentioned this in the original post. My apologies, ladies and gentlemen.

The resistors are connected in-line in the blue/red tracer wire on the ICP.

Sorry for any confusion this may have caused.

 

so you gained 30 hp and about tq with the 20k resistor -nice!!

 

90 tq sorry

 

Yep. The dyno operator/shop owner was so impressed with what I was doing, he kept asking me if I had more combinations to check.

This was a "special" event by another local diesel truck club I joined. I paid $50 for the first three runs, an additional $30 for the next three runs. The dyno guy was having so much fun watching me shut off the engine, jump out of the truck, unplug one resistor combo, put in a different combo, jump back in the truck, start the engine and make another run. He let keep going at no cost just to watch the HP/TQ numbers change with such a simple modification.

Another event is scheduled for later this year. I hope to have the exhaust, downpipe, gauges, flexplate, TC, and tranny done before the next event so I can check the resistors again.

 

I had the same problem with my truck about a week after i did the mod, I took it all back out and sodered it all up and havent had a problem sense.



I wish I could find a club around here that did tha kind of thing.

 

Yes me too. I would like to see the numbers some time.

 

Rep sent!!!!!!!!

 

Thanks for the input, reps, and comments everyone. After seeing the numbers on the dyno, I hafta recommend when doing this mod that dyno runs be done.

I was amazed that some resistors actually caused a DECREASE in numbers. I would never have known that if I hadn't been on the rollers and seen it with my own eyes.

Factoring in the cost of the dyno sessions, I think this mod is still an inexpensive way to increase performance. If the 20.3K doesn't increase my MPG, I know I can switch back to the 14.7K to give me more power over stock AND increase my MPG.

Knowledge is a wonderful thing.

 

must spred the reps i guess so i'll post it here. that is awesome info i was wondering if that is compatible to run with my superchips? or just run the resistors alone? i sure want to go along on the next dyno day! good luck with the next mods.