MAX Dyno MPH?

dzlfarmboy

dzlfarmboy

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Just curious of what some peoples MPH when they top out on a dyno. Last weekend at a local event we had a 2005 6.0 on the dyno and the owner wanted to take it to the max it ended up doing 158mph@4500rpms and prob could have taken it a lil farther. I just thought it was nuts for a street driven truck to turn that much. It only did like 376hp, but damm!
 
We saw 165 MPH at the spring fling out of a p-pumped 24 v truck.
 
Yeah im sure some real modded trucks will turn alot with added rpm, but this was just a 6.0 with like a SCT tune and exhuast, intake.
 
0428dyno_speed.gif
 
4200 rpm, 0.69:1 overdrive ratio, 3.55 gears and 33" tires.

I wish I could find Chris Hentzel's BBC 110-octane pulling truck 184mph dyno run picture. 8000 rpm, 1:1 transmission gear, unknown rear gear and 35" boggers. We thought the truck was going to fall apart since rocks were falling off the frame and shooting off the tires.
 
SOMEONE PLEASE EXPLAIN THIS TO ME!!??

How in the world is a diesel that redlines at 3200, being able to pull MPH from anything over 120???

to get an accurate dyno reading your transmission needs to be in 1:1, NOT in overdrive.

in my truck, my 3rd gear is 1:1(or pretty close) when locked up. i have 3:54 gears in the axles, and 35" tires. at 3500rpm(300 past my redline) my truck will only be going 102MPH.

if i ONLY changed it by putting 37's on my truck my 3500rpm speed would be 108.

even if i did 37" tires and dropped the axle ratio down to 3.07 i'd still be going only 125mph.

lastly if i pushed my truck in theory to the end of the RPM range on my tach(which is 4000rpm) and i was running 37's and 3.07's in the axles, my truck would FINALLY be going 143. WHICH IS SLOWER THAN THE NUMBERS ABOVE.


so, in wrapping this up, in reply to the first post on this thread, how is a 6.0 ford going 158 mph at 1:1? in stock form or even mildly modified form the engine will go to 4500rpm?? plus it needs to have no more than 3.07's in the axles with 35's.
 
pizziLLA said:
SOMEONE PLEASE EXPLAIN THIS TO ME!!??

How in the world is a diesel that redlines at 3200, being able to pull MPH from anything over 120???


so, in wrapping this up, in reply to the first post on this thread, how is a 6.0 ford going 158 mph at 1:1? .
Click to expand...

It's the batmobile....duhhh :bang
 
i didnt know batman decided to go with fords this year??!??
 
pizziLLA said:
SOMEONE PLEASE EXPLAIN THIS TO ME!!??

How in the world is a diesel that redlines at 3200, being able to pull MPH from anything over 120???

to get an accurate dyno reading your transmission needs to be in 1:1, NOT in overdrive.

in my truck, my 3rd gear is 1:1(or pretty close) when locked up. i have 3:54 gears in the axles, and 35" tires. at 3500rpm(300 past my redline) my truck will only be going 102MPH.

if i ONLY changed it by putting 37's on my truck my 3500rpm speed would be 108.

even if i did 37" tires and dropped the axle ratio down to 3.07 i'd still be going only 125mph.

lastly if i pushed my truck in theory to the end of the RPM range on my tach(which is 4000rpm) and i was running 37's and 3.07's in the axles, my truck would FINALLY be going 143. WHICH IS SLOWER THAN THE NUMBERS ABOVE.


so, in wrapping this up, in reply to the first post on this thread, how is a 6.0 ford going 158 mph at 1:1? in stock form or even mildly modified form the engine will go to 4500rpm?? plus it needs to have no more than 3.07's in the axles with 35's.
Click to expand...



i like how comp diesel has the calculators right there for everyone to use, its a lot easier than finding them on TDR or DTR
 
Most of us diesel guys use OD on the Dyno...since "typically" our trucks weigh more than the dyno rollers, and using OD get's us closer to the load we see everyday on the street, giving us more accurate numbers;)

Chris
 
pizziLLA said:
SOMEONE PLEASE EXPLAIN THIS TO ME!!??


to get an accurate dyno reading your transmission needs to be in 1:1, NOT in overdrive.
Click to expand...


That is an acurate statement:poke:

Only on a LOAD type dyno should you run in 1:1 and most of those types of dynos are extremely inconsistant when it comes to comparing numbers.

All inertia dyno runs (Dynojet) should be run in OD.
 
Signature600 said:
Most of us diesel guys use OD on the Dyno...since "typically" our trucks weigh more than the dyno rollers, and using OD get's us closer to the load we see everyday on the street, giving us more accurate numbers;)

Chris
Click to expand...
wow, every dyno ive been to wants you to put it your truck as close to 1:1 as possible; and ive been under the assumption that you always should be.


having different measuring techniques like this would completely change the numbers from one dyno to the next and one vehicle to the next; one gear to the other; essentially making the tq and hp numbers useless.

if i put my truck in 2 wheel low range first gear, id have an insane torque number and almost NO horsepower.

concequently, the LESS gear reduction(high range OD) will create more HP and less torque as judged by the dyno.

its completely about gearing, since horsepower is nothing but a byproduct of torque and speed.

if i put my truck on a dynojet and keep it in 3rd, my numbers will be quite different than if i put it in OD.

next time im on the dyno im going to keep it in first gear, so that i can have a tq value over 2000ft/lb, and a horsepower of like 150.
 
You want the most load you can get on the motor. When you are calculating HP it is a know constant you are dealing with. For torque readings they like you to be 1:1.


Try to load the motor in first gear on the inertia dyno.
 
ah good point. i understand how you could want more load for the rollers. i get irritated when i go to a dynojet set up for imports and redline my truck before building even 10lbs of boost. got it. so the difference is technique between a load type dyno and an inertia type dyno??
 
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