92smokin blacky

Well I dynoed here at the Idaho State University's dyno in the automotive shop on Wednesday. I just started into diesel here this fall and found out we could dyno at the automotive shop for $25 for 6 or more runs. So I'm gonna start takin advantage of this The dyno is a mustang dyno. I got my truck on there and he asked the weight of the truck and I told him about 6200 lbs, so he looked it up on a chart and found 5200 (musta looked at a gasser) so he put it about in the middle at 5850 lbs. He said he wasn't sure how to adjust the load on this dyno but I was guessing thats what the weight was all about.

The main reason I was dynoing this time is to see a hp difference in the injectors I am borrowing. I have custom 5x13 or 14 injectors in the truck for these 6 runs then I'm gonna pull them out and put my PODs back in and dyno again in a week or two to see a hp difference, cuz on the street I can't tell much difference other than the PODs are a bit dirtier. Boost numbers are the same

I dynoed 6 times

#1: 3rd gear, KSB off
302.3hp 503.3 ft lbs
362.8hp 604.1 ft lbs corrected

#2: OD, KSB off
304.4hp 533.7 ft lbs
364.8hp 639.6 ft lbs corrected

#3: OD, KSB on
322.0 hp 553.4 ft lbs
386.3 hp 663.8 ft lbs corrected

Stopped after 3 runs and zip tied TV cable almost wide open, was then shifting very firm at about 2600 rpm

#4: 3rd gear, KSB on
309.6 hp 499.7 ft lbs
370.9 hp 598.6 ft lbs corrected

#5: OD, KSB on
318.8 hp 550.2 ft lbs
382.4 hp 660.2 ft lbs corrected

#6: OD, KSB on
321.1 hp 551.8 ft lbs
385.2 hp 661.3 ft lbs corrected

So the KSB hotwire is definately worth doing and gave me 20ish hp. But looking at my dyno papers, they seem weird to me. Its saying I'm making my peak power in OD at 3000-3200 rpm at around 90-97 mph and max tq at 3000-3200 rpm as well but between 75-85mph. And while in 3rd gear I'm making my peak hp and tq at about 3150 to 3250 rpm at around 70-75mph. Don't the tq numbers peak around 2200-2600 rpm??? not 3000+ rpm??? I've heard mustangs are different to dyno on and usually get lower results but I was just kinda confused. I was hitting the dyno "window at about 60 to 95 or 100mph in OD and 45 to 85mph in 3rd at about 5 to 10 lbs of boost.

I was wanting him to turn the load up but he wasn't sure how and then I asked if he could turn the weight up and he said he would have to reset the whole system, so I'm wondering since it said I was lot lighter that it made my numbers different?

I've dynoed 307hp about 2 years ago on a superflow at 20% load, 341 hp and 594 ft lbs at Bully Dog's dyno this summer with no load, and made 375hp 769 ft lbs corrected on Edge's dyno in August. So I know I'm between 300 and 380ish hp but I don't know exactly where. I know all dynos are different and the corrected numbers aren't the true numbers for that day but its all makin me curious even though I'm only doin these to see injector hp differences.

Here is the Videos of the first 3 runs in order with an open turbo because I was being safe and had my buddy with a clipboard waiting for runaway.
http://youtu.be/NUCzUZnaJp4
http://youtu.be/0zcxPSpZVK8?hd=1
http://youtu.be/55DlTDEu0Ls

While dynoing, I would let off at about 95 or 100mph and I'd be running 3100 to 3300 rpm and my motor rpms would then come back down to about 2700 rpm and hang there for a few seconds then drop off back to an idle fast, it did this pretty much every run and would hang. Is this cuz its so close to runaway or is it just the dyno rollers pushing the motor through my drivetrain at that rpm for a few seconds? I wasn't sure but you can kind of hear it in the videos as well

dieselJon

The turbo lighting also effects torque. Once you use all that fuel, it is making the HP/TQ. HP = Tq @ RPM.

The_Head

I don't agree. It makes your numbers less realistic, since you aren't utilizing the KSB at all times in real world situations, or maybe you are?

I wouldn't be so hung up on dyno numbers if I were you and concentrate on real life results, such as 1/4 mile times, or sled pulling results. Although I might be re-dynoing mine in November

92smokin blacky

I do use my KSB when I feel the need, on the street I can't tell much difference but the dyno says yes so I use it when I race, pull or have someone with a mouth bigger than their truck or car. I do pull and have raced once, and more of that will come. But I still want to know what kind of hp number its pushin so that when I beat a 600+hp truck its that much better. Plus its a good tuning tool.

bgilbert

It's a dyno thing.

But if you wanna talk less realistic, nitrous numbers take the cake.

The_Head

I think I know where you are coming from and I totally agree!

JQmile

Ha, ha, I'll be the nitrous guy that chimes in here....and it doesn't even have to do with nitrous! I bet if you shifted on the dyno it would continue to make 330-ish after the shift, even with the rpm drop...diesels have a pretty flat power curve....and that's where the torque comes from, from the turbo being lit, and the engine making the same power after a shift. For OEM stuff, they start at peak rpm and drag em backwards, so the turbo stays lit until it is snuffed out, which is usually down pretty low. You can do the same thing on a chassis dyno, but it mostly just breaks stuff, and isn't worth the good torque number.

92smokin blacky

Okay that makes a little more sense, I think when I dyno next time with my PODs, I'll do my 1st 3 runs the same as these so i can have a number to compare with, then the next 3 runs I am gonna set the window later so I can be spooled or in full boost coming into the test instead of at 10 or so lbs and having to light the turbo right before and see what happens. I'm still tryin to get a hang of this dyno thing.

What do you think about my rpms hanging around 2700 rpm after I let off? is it just on the edge or is the rollers keeping my rpms up by pushing the motor through my drivetrain???

stillsmokin209

It works pretty good for competition.....

fatt

Thank you sir. Horsepower is horsepower no matter what you use to make said power.

Douglas2

And therein lies the explanation of why lots of low-RPM torque is nice; there is more hp down low and the engine is nicer to live with.
cheers,
Douglas

pwrtripls1

With a smaller turbo your tq number would climb alot, and your hp would be close to the same up top. You still have the 3000? Try it with the pods and I bet you see higher hp and tq.

92smokin blacky

I made 341 hp and 594 ft lbs at Bully Dog's dyno this summer with no load. That was with my Aurora 3000 and PODs. And I made 375hp 769 ft lbs corrected on Edge's dyno in August with the Aurora 5000 and the 5x13 or 14s i have in now.

I dont know that itd make more tq or not with the smaller turbo. Just driving on the street this bigger turbo pulls much harder and lights really hard. And I'm thinkin I won't see much of a hp or tq change in these pods, maybe 10hp or so but we will see in a few weeks

big stinky

The difference you are seeing in the numbers is the load rating through the automatic. No load- torque converter not slipping, load-slipping more. Like these guys said, try a track... Its about "the curve" not the peak...

Rick 12v CTD

yeah I have no doubt a lot of power is being lost through that stock auto... and it's probably not going to be consistent either.