new dyno numbers

BLovett

BLovett

New member
Had my truck tuned on an awd dyno wednesday. These results are with no correction figure to give inflated numbers. At 19 lbs of boost the truck made 410 hp and 576 ft/lbs of torque. Just wondering of anyone has thoughts on why such a large gap between hp and torque.
Brent
Sy 1101
 
BLovett

BLovett

New member
Re: new dyno numbers

I didn't even take it with me. I actually left the truck at the shop for more fine tuning. When I pick it up i will grab the chart and post it. The truck has a major backfire when shifting. He is working on that
 
BLovett

BLovett

New member
Re: new dyno numbers

67/66 turbo, heavily ported vortechs and matched intake forged pistons
3" single exhaust 3" downpipe 60 lb injectors 2600 stall and built granny 214/214 cam
 
BLovett

BLovett

New member
Re: new dyno numbers

Not yet. Will get there soon after I get totally dialed in. I'm not really sure what to expect. What are you shooting for?
 
N

njglhs

New member
Re: new dyno numbers

580 awd ftlb trq must pull like a freight train! Cant wait to hear your reports of real world performance and feel.
 
IGottaSy

IGottaSy

Active member
Re: new dyno numbers

BLovett said:
Had my truck tuned on an awd dyno wednesday. These results are with no correction figure to give inflated numbers. At 19 lbs of boost the truck made 410 hp and 576 ft/lbs of torque. Just wondering of anyone has thoughts on why such a large gap between hp and torque.
Brent
Sy 1101
Click to expand...

Niiice!:tup:

Where is the Like button up In here?
 
SEL777

SEL777

One of 101
Re: new dyno numbers

Congrats!! I plugged your HP into 2 1/4 mile calculators and got an 11.9. But did not see any with AWD drive train losses (first one showed 17% DT loss). Used 3500# too. I have a 67mm (in the pile of parts) and know those have been to the 10's
 
Don W.

Don W.

Stab it and steer it
Re: new dyno numbers

Ever get the graph? Those are nice numbers but we need RPM to gauge why they might be "odd."
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: new dyno numbers

SEL777 said:
Congrats!! I plugged your HP into 2 1/4 mile calculators and got an 11.9. But did not see any with AWD drive train losses (first one showed 17% DT loss). Used 3500# too. I have a 67mm (in the pile of parts) and know those have been to the 10's
Click to expand...

Our DT is closer to 23-25%. I think 410 is at the wheels. It should be able to run mids 11's with kind of hp in a Typhoon.
 
NOJIMMY

NOJIMMY

New member
Re: new dyno numbers

Don W. said:
Ever get the graph? Those are nice numbers but we need RPM to gauge why they might be "odd."
Click to expand...

Don is absolutely right.......
We all know Torque is rotational force measured in ft-lbs. But its a static measurement not expressing accomplishment over duration of time.
Mr. James Watt calculated 1 horse could produce 33,000 ft-lbs of work per minute.

Ever notice where a torque curve and hp graph curve cross?
A 1 lb weight on the end of 1 foot lever = 1 ft-lb of twisting force.
To convert linear value to rotational motion of crankshaft the circumference of a circle = (1ft) x pi x2 = 6.28 ft/revolution.
33,000 ft-lbs / 6.28 = 5,252 (the figure that converts linear to rotational motion).
HP = Torque x RPM x 33,000 / 2 pi = Torque x RPM / 5,252

Torque is multiplied with every revolution of the crankshaft; HP is the rate at which torque is produced in 1 minute.
So, the only way to increase HP is to increase torque output or RPM. However there is a practical limit to how many RPMs
a motor can turn (most redlline at 7,500), with avg in the range 1K to 6,500K.

NASCAR engines are perfect examples of why RPM is the single biggest limiting factor of how much power small motors
can produce. The current limit of steel valve springs is about 83 to 85 cycles/sec which = 10,000 rpm in 4-stroke engine.
Hp = TQ x rpm /5252 (smaller motors = less TQ, so higher rpms are required to match larger displacements)
 
Don W.

Don W.

Stab it and steer it
Re: new dyno numbers

I'll admit that I've always wondered where the constant, 5252, came from. Now I know.

Side bar: Big truck diesels have pretty much been limited to 2100 RPM for many many years. As HP increased the numbers that changed was torque and the RPM it was produced at.

Old engines: 200 HP = 500 Ft Lbs
New high HP engines: 600 HP = 1500 Ft Lbs.

And engine size, IE cubic inches, only went up slightly. One example 743 to 855.

Thanks!
 
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