Dyno run

[Matt S]

Yesterday we went to the meet in Rhode Island to get on the dyno. Quite a few trucks there. Mopar-Muscle laid down the first run and set the pace with about 410 hp in his 24-valve but no torque readings due to signal problems.



I was a little disappointed at my number of 230 hp. A few weeks ago at the track I was able to get 82 mph which would calculate me at 260 hp at the wheels. The dynojet didn't seem to put any load on the truck so I saw about 3 lbs less than I ususally get on the street. I was seeing 22 lbs of boost and 850-900 degrees in 4th gear on the dyno with a lot of black smoke. Next time will try it in 5th to generate more boost. I guess the good news is that my drag racing skills aren't as bad as I had thought if I did better on the track than I should have according to the dyno.



Now what's next? I didn't really want to crank my pump so that I can't tow without EGT problems so I'm limited in that regards. I do have a lot of smoke so I know I'm getting the fuel, just not burning it. I'm probably going with a different exhaust housing as the 16 cm doesn't spool fast enough. I haven't had my timing checked yet. Anyone have any suggestions?

 

[Shrimpy]

Hey Matt, I would be proud of those numbers. Remember that on the First gens that since the Dyno can't "Load" the turbo, you may actually be seeing better numbers in real life. Remember to that our First gens make all of our power down low unlike our 24v brothers who make it much higher in the rpm band, possibly allowing better turbo load.



As far as the switching from 16 cm to 14 cm housing, think about what the ultimate purpose of your truck will be. I personally like the 16 for towing with my auto, but since your is a 5sp, the 14 may be O. K. . The 14 will come up faster but fall off sooner. Before I switched from my stock 21. 5 to the 16, my truck would run about 105 mph top speed. Now at 92 to 94 mph it is done. I think we First gens need to work on a better air induction. I think it was Bob Beauchamp (sp) who drilled the holes in the cowl below the right blinker and noticed a improvement.



I would seriously try to get the Timing checked properly. That is the spill port method as outlined by Powerwagon and Ted Janetty. How far are you from Ted's place in Conn. . He seems to be a stand up guy and will definently shoot you staright I believe. The timing could cure your smoke problems maybe.



Good luck and keep us posted.

 

[NeedMoPower]

Hey Matt S,

Have you turned your pump up at all? I think 230hp without any pump tweaking is real good. I would be proud of those numbers... I haven't heard of many first gens getting higher.

 

[Gary - K7GLD]

We had a dyno day in Sacramento yesterday as well, and I got a reading of 198 hp and 383 torque at the rear wheels on their Mustang dyno - that equates to 235 hp and 460 Tq at the flywheel - not bad, but I too turn in the low-to-mid 80's at the strip in the mid-16's. I too had expected better, especially from a Mustang dyno that SUPPOSEDLY places a load on the engine to give a more accurate reading similar to real life - but I was also seeing MUCH reduced boost under load - 10 lbs instead of the normal 20 I see when towing - so I assume my readings are also VERY much lower than what my Cummins is actually capable of under maximum load and boost.

 

[wxman]

Gary, were you running your propane when you dyno'd your truck?

 

[Matt S]

Mustang dyno's put a load on the truck? I know there is a type that does but I didn't know the name.



I have touched my pump a little with the diaphram and power screw. Looks like I may touch it again. Was looking into turbo's but I think I may try a housing swap again to see how I like it. A site I looked at today (can't remember which one off hand) said the 12 cm2 gets power from 1200-2500 and the 14 cm2 gets power from 1400-2800. My max RPM is 2500 so I may look into getting a throw-away from a 2nd Gen who isn't going to use it.



Anyone with a pump that has been turned up 'internally' know what that means? Anyone know the differences in the 230 hp pumps vs our 160 hp pump?

 

[Gary - K7GLD]

WXMAN - yes, I was running the propane - another "problem" with the way the dyno runs were operated was the fact that while we got several runs, the printout appeared to be a compiled AVERAGE of the various runs instead of a SEPARATE printout for EACH run. I wanted to try switching the propane off to see how much HP it was adding, but under the circumstances, could not without screwing up the works...



PLUS, the fact that while my final HP/torque numbers SEEM in the ballpark considering the reduced boost I was getting while being dynoed, the accompanying graph printouts were VERY screwed up and obviously innacurate (most of us didn't get the printout until AFTER we had exited the dyno, so the flaw wasn't caught in time to re-run right on the spot) - the techs agreed, and offered to re-run my truck after all the others had been thru, but I had other obligations and had to get back home...



OH well, it was a "learning experience"...

 

[KEENO]

Dyno numbers

Hey Matt!



Congratulations on the numbers from the dyno run! I've always wanted to get our trucks on the dyno for GIGGLES, but haven't got there yet! Way to go!



Matt, shoot me an email if you want to try a 12cm2 off of a second generation. I don't know if I can make you as good of a deal as the steering stabilizer but it'll be close... .



KEENO

 

[Cummnzpowr]

my DYNO readings

i dyno'd right before Gary last saturday in Sacramento..... 251 horse. . and 593 torque i'm pissed, first gens bite... i want a real truck

 

[Gary - K7GLD]

HEY GREG - did you happen to notice what max turbo boost level you were running during the test?



I normally see about 20 lbs in trailer pulling in the hills, but only 10 max on the dyno... Gotta be LOTS more power there waiting to spin the wheels, if the load can be applied to get the boost up...



It's my own fault - they gave me the option of a "loaded" simulation test, using whatever percentage grade and trailer weight I wanted, but I decided to do the same conventional baseline run as everyone else for comparisons sake - I just thought that even in THAT mode with the Mustang dyno, there would be an attempt made to load the engine to force it to develop maximum available power, which would be better than the primitive basic mass accelleration mode used in Dynojet dynos...



I wuz wrong...

 

[drives mopars]

my dyno and stuff

my 93 saturday went 215 hp 545 tork



from a 93 dually 4x4 , in vegas i went same but

not mustang also on mustang turned up pumpsome



got 30 psi boost in 4th gear ran to 3000 rpm



lots of black smoke too,



it still was better then the shop in vegas



best shop so far is diesel dynamics in vegas



i did not dyno there



gary whats up with the 10 psi



bill

 

[Matt S]

Thanks Keeno. I'll discuss this offline.



I've got to believe that 300 hp is possible with these trucks. I can't see how the pump is that limited. I know I can get way more fuel than I can burn. Just have to figure a way to burn it.

 

[Gary - K7GLD]

BILL - just not enough load on the rear wheels to cause the turbo boost to max out - I get about 20 lbs boost in the hills under load, and I'm certain I'm making LOTS more power under those conditions than what I was seeing on my dyno runs...



Like I said, they agreed my runs were screwed up, and offered to re-run my truck, but I couldn't hang around that long...

 

[Dieselman359]

Not to Shabby

Thanks guys, now I don't feel so bad about my numbers. It seemes like my horsepower is lower than everyone's, but my torque is highter. It must be that free-flowin' stack!

My numbers; 207hp

612lb-ft

I have been thinking of toying around with the pump, but I don't think that I will. Gotta draw the line,... a very fine line that is!

 

[R.E. Miller]

Yeah, I would like to have those numbers, that is where a lot of us are shooting for... 230 is nice! You change to a 16 or a 14cm^2 housing Matt, and then your truck will be off the hook

 

[Cummnzpowr]

Boost #'rs on Dyno

Gary:

My boost hit only around 35 or so... with load uphill and full throttle i've seen above 40psi

 

[Matt S]

Well, I'm going to try a 12 cm2 housing to see if I can clean up the exhaust (yeah right!). It will put that Banks intercooler to the test. Keeno has hooked me up, again. When it is installed I'll give a report. A Piers turbo would be nice but the funds aren't there right now. So a used housing and a screwdriver get the nod.

 

[MMiller]

I don't know anything about the dynos you guys are running on but some of them sound more like a dyno for race cars, i. e. GAS motors. I work for the CAT dealership here in Davenport Iowa and we can put the new Semis on the dyno and we pull them down to 1200 rpm at full fuel to get the hp and torque numbers. I work on heavy equipment but I've seen alot of semis on the dyno some with the new 600 horse cat engine running 1800 ft lbs of torque. This is the way cat wants them dynoed so I think this is the way to dyno our cummins. I was going to run mine on the dyno soon but my getrag started making noise pulling the trailer this weekend. I better wait until its repaired. I will get back with numbers later.

 

[drives mopars]

mmiller

put n a nv 4500



unless you can repair it cheap