Dyno didnt seem right...thoughts?

my truck in sig just did 617hp and 1070tq, if ur trucks got the same mod's then sounds bought right to me.
 
SledPuller21 said:
Just got in from sarver and put out 650hp and 1052tq. I felt from driving my truck and riding in other CRs I've worked on that I should've been well into the low 700's. My question is why so low on the tq? I dynoed last year and got 572hp and 1162tq with a different setup and the stock charger. Also I was told by the operator to run my truck in 6th (5 other times I've dynoed other places they go with 1:1 in 5th). Anyhow went God knows how fast and only saw 1250 egt(I hit 1800 WOT by 3700 in 6th on the street)... didnt get a boost reading since I blew my line off the gauge on the way there. I know I have enough fuel to heat a large house, and a enough air to support 700...what gives? Any thoughts or just not enough load on the dyno? I'll get my sheet up when I can and hopefully someone from sarver got a vid of my run. Thanks.
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I didn't read the other posts, so some of this may be a repeat...

1. How many CR's out there are "well into" the 700's with a 66? not many. Although everyone on the internet has 700+ :)

2. your torque is lower than it was with the stock charger because you have a slow spooling turbo.

3. 6th gear will load your truck better than 5th. Any frictional losses associated with running a taller gear than direct drive are made up with better power through a better load. How hard would it have been to try both ways?

4. Without a boost reading, there isn't really a way to tell if your truck got a good load or not. Get that fixed and get back on the rollers.

-jp
 
SledPuller21 said:
Haha I didnt sell him junk parts they were used. tranny adapter had a crack that I had no idea about, I'm an honest guy not out to screw anybody I would have gladly gave him his money back but he was getting real chitty with me on the phone before I could even get a word in. Glad I left eh? Hmmm maybe he was gonna slash my tires?
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I'd say your tires would have been the least of your worries. Thanks Steve B.
 
2007 5.9 said:
Yes, you are right, the 224 cant keep a constant load for 10min, more like 5-6min. Does that make it a bad dyno???

All dyno's are good for is a tuning tool, you run on one, make a change, run again to see if that change was a +/-, comparing dyno's for calculating the most HP is futile.

There was a time when I believed that the ever popular 248c was the standard in measuring HP, until I dynoed at Left Coast in 2008 right before the Nor Cal Diesel Rally which i knew was going to be having "The Humbler" Maddog dyno. I ran a 545hp run at LCD, then proceeded to Nor Cal Rally and put up a 575hp run. How is one to explain this...other than going from one dyno to another is only going to be a guess on weather or not you make more power or not.

It really doesnt matter which one you use, if you want to truly know what HP you have, you need to spend the time on the exact same dyno everytime which will give consistant readings. You can accuratly measure HP changes on the same dyno...then when you think you have maxed out, go to the track and compare your trap MPH with you HP and see if you are close.

So to the OP, your numbers sound a little low but the only real way to know is by trap MPH at the strip. Who's to say the air on your first day wasnt better than you last one...when you started your run...boost numbers to begin with...how quickly you applied throttle....there are lots of variables that go into becoming a consistant and repeatable vehicle operator on a dyno.
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You never answered the question of how much HP the absorber on the 224X can dissipate. Do you know, or not?

Sledpuller21 is a sledpuller (imagine that). A DJ is a terrible comparison to what a hook is like in real life.

And I just have no patience with folks who claim "it's just a tool, they all vary". BS! There's a reason they all vary and it has tons to do with design and operation. But a load cell is hard to deny because it measures torque directly. Inertia designs use estimating techniques based on acceleration rates of an essentially frictionless roller.

Combine the funny math with a totally non-real-world load scenario, and it's kinda obvious how inertia based dynos can yield a wierd slice of reality. Repeatable, yes, Accurate? Hard to say. At least with a load cell unit, you can calibrate the load cell and it's pretty straightforward, basic physics principles. With a DJ all you have is "what the computer says" :doh:

You all a free to choose what you want, that's fine. For me, I won't even bother to run anything but a SuperFlow.

Good to see you on here John.
 
ctd8999 said:
I'd say your tires would have been the least of your worries. Thanks Steve B.
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Love the youngster posturing!!!!

They were all at the same place-in person-..but SOMEHOW missed seeing each other, NOW on the net they are going to be tough guys.:doh:

HILARIOUS!!!!!!:bang:bang:bang:hehe::hehe::hehe:
 
Sledpuller said:
Love the youngster posturing!!!!

They were all at the same place-in person-..but SOMEHOW missed seeing each other, NOW on the net they are going to be tough guys.:doh:

HILARIOUS!!!!!!:bang:bang:bang:hehe::hehe::hehe:
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lol:hehe:

:stab:
 
Sledpuller said:
Love the youngster posturing!!!!

They were all at the same place-in person-..but SOMEHOW missed seeing each other, NOW on the net they are going to be tough guys.:doh:

HILARIOUS!!!!!!:bang:bang:bang:hehe::hehe::hehe:
Click to expand...

Not everyone is a Ninja like you Gene!:chug:
 
kmkdiesel said:
that statement just made everything you have said go out the door on the knowledge you have about dynos:bang
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So you are saying it makes perfect sense that one day atruck makes 200HP the next day it makes 800?

I have always thought it was funny, "The dyno was reading low."

Strange you never hear them complain the dyno was "reading high."

You think these PRECISION instruments would give one number-the correct one, not the corrected one, or the uncorrected one.......

Or maybe we just have to accept there really is dozens of 2.6 dayly drivers that are making 1200HP to the wheels....:hehe::hehe:

I love dyno threads!:woohoo:
 
SledPuller21 said:
IMG_0321.jpg
Heres the sheet, kinda hard to see but peak power at 32-3300.
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Max power is too late for a good dyno number, max hp needs to be in the 2400-2800 range, 2800 is close to the edge, either not enough load or something is not right with the combo.....ie lag pig!

Jim
 
kmkdiesel said:
that statement just made everything you have said go out the door on the knowledge you have about dynos:bang
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So WTF do you know about instrumentation, data analysis, and statistics?

Lemme guess...nothing.

I'll go up against ANYONE when it comes to test and measurement, bub, I do it for a living.

Let's hear some knowledge from you.
 
nwpadmax said:
So WTF do you know about instrumentation, data analysis, and statistics?

Lemme guess...nothing.

I'll go up against ANYONE when it comes to test and measurement, bub, I do it for a living.

Let's hear some knowledge from you.
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so your saying if I put my truck on 5 different dynoes I will get the exact same numbers from all of them.
 
JOHNBOY said:
My messing with 2.6 turbos.
You can only jam so much crap thru the turbine of a S300

Do you still have one Pump?
Rail Pressure gage?
Pressure Box?
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Lol yes dual cp3's, II stg 2 on the bottom. MP-8 for pressure, and a rp gauge saw 25-26k on the top end. Any other q's.
 
jlibert said:
ways?

4. Without a boost reading, there isn't really a way to tell if your truck got a good load or not. Get that fixed and get back on the rollers.

-jp
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EGT tells me truck was not loaded properly, I can set my truck on jack stand and run it to 150mph...do you think I would see the same egt as the road? Yeah it woulda been nice to have boost too but thats what happens sometimes. I'll be trying to hit up that superflow in the next few weeks.
 
Sledpuller said:
Love the youngster posturing!!!!

They were all at the same place-in person-..but SOMEHOW missed seeing each other, NOW on the net they are going to be tough guys.:doh:

HILARIOUS!!!!!!:bang:bang:bang:hehe::hehe::hehe:
Click to expand...

I love that...made me chuckle.
 
kmkdiesel said:
so your saying if I put my truck on 5 different dynoes I will get the exact same numbers from all of them.
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Absolutely not!

What I am saying is, too many people accept the fact that there ARE wide differences between dynos, and many just throw their hands in the air and accept that crappy situation, like it's a random number generator and nothing can be done about it.

I don't accept that crappy situation, and I think there are many ways that we could improve the accuracy and repeatability if we want to take the time to do so.

Would we accept it if all the fuel stations in the country used different weights and measures and calibrations and you never really knew how many gallons you really got? And it changed all the time from day to day and state to state? I think not!

What I'm griping about is the appalling lack of standardization and calibration. I think it can be greatly improved!
 
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