Thread: dyno'd the 300tdi yesterday

Originally Posted by awabbit6

That's why I asked about the values quoted as rear wheel values.

798Nm is correct at the wheels. There are too many assumptions to convert to accurate flywheel values.

How do the numbers compare to the last time it was done?

the previous dyno the guy could not give me torque

95bhp at the wheels woohoo

oh i agree, quite a few people state the outputs of there engines however have never run them up on the dyno

G'evening all, 98 HP is only about 59 KW, I would reckon the 300 would produce somewhere around 98-100 KW at the flywheel with perhaps 30% loss of efficiency by the time the klickerwatts get to the wheels.

Dunno what the conversion is from lbs/ft to Nm but I reckon at the flywheel the 300 would yield about 270, maybe 290 Nm.

As the D4 produces 600 Nm at the flywheel there's no way the 300 could do 798. Cheers.

horse power and foot lbs are the go,
how come the frogs got these weird measurements?

kilowatts?

a horse is a real thing and it's power output is known, yep there are different horses, stiff, not going there.

newton metres?

most people have a foot or two,
and can push a pound or two with it,

who'se got a metre, and what's a newton?

bah humbug metric crap!!

oh,
and weeds, good numbers for your truck.

no wonder it needs the slow lane on hills!

Originally Posted by weeds

a very informed post.......

the are at the wheels, i'm sure somebody will come along and explain the torque figures in plain terms

AFAIK hp or kw is always a amount of loss not a percentage...IE you dont loose 30% but more a set amount depending on the drive line efficencies...like gearbox/transfercase and diff friction losses....but torque will be increased (to a degree) buy the gear ratios....this when talking measured at the wheels, which after all is just a good a reference as the flywheel...

remember defenders have 2 gearboxes and 3 diffs to burn up power....

Serg

Ill have metric thanks....hp can be dubius depending on which engineering society you follow....cough cough (the yanks)....

my stock 300tdi 110 was 47kw at the wheels on a 4wd dyno

Serg

If you know the engine rpm at a few points along the power curve then you can scale the torque curve to be correct.
The result then would be engine power and torque as delivered to the ground.

Originally Posted by harry

horse power and foot lbs are the go,
how come the frogs got these weird measurements?

kilowatts?

a horse is a real thing and it's power output is known, yep there are different horses, stiff, not going there.

newton metres?

most people have a foot or two,
and can push a pound or two with it,

who'se got a metre, and what's a newton?

bah humbug metric crap!!

oh,
and weeds, good numbers for your truck.

no wonder it needs the slow lane on hills!

Like it or not, Australia has been metric since about 1972 - even old farts like me can manage it.

Maybe you need to get with the programme .