Do you talk power or drive torque?

[pgarner]

the reason that the graphs should cross is at this point 1 hp = 1 ftlb. i had a quick look but cant see anyhing over than how they have worked this out from what James watt worked out.

what i did find out is the formula given before ( [torque (ftlb) x rpm] / 5252 ) but with the full figures not rounded is used by dyno to work out the horsepower. which does make sense as your turning the wheels on the dyno and torque is the turning force

if i get a chance this afternoon al have another go at searching for info on it

[HDi fun]

OK - so 1bhp = 1 ftlb at 5252rpm. Bear in mind that ftlb is rotational force (torque) and bhp is power (rate at which work is done).

So an engine that produces 100bhp at 5252rpm will develop 100lb/ft at 5252 rpm.

I think something has been lost in translation here. Eg. an engine that develops 100bhp at 2626rpm (half of 5252) will need to develop 200lbft at 2626rpm.

This has no bearing on what it will deliver at 5252, or whether the curves will meet at that point.

[kevin]

Typically HP is measured at the engine and Torque is measured at the rear wheel. 1000HP does no good if you cant get it to the rear wheels. The true measurement would be torque/weight but who does that?

[kevin]

Question? My laptop was stolen along with my software and cables. I have an old laptop with some older versions of software on it but no cable. I bought a cable on E-bay that doesn't work. Any one know where I can get a real working cable to link obd11 to my laptop at a decent price?
Thanks

[HDi fun]

Torque is generally also measured at the flywheel (if measured at the drive wheels then xmission losses are added to give a flywheel figure).

Measuring a true flywheel figure would mean taking the engine out of the car.

Which is a lot of mucking about for a quick dyno run.

Cheers,

Rgds,

P.

[HDi fun]

Kevin, try here for a cable.

www.skpang.co.uk

What software are you using, and for what purpose?

[pgarner]

kevin usb cable may not have been setup correctly by windows this is the info i was sent when i got my cable of ebay



If you have problems getting this cable to work then it is normally due to
the ports being incorrectly set within windows.

Please check the following:


1, Install the driver supplied.

2, Insert the usb end of the cable into you PC.

3, go to 'Device manager' (via the start menu, right click on my computer,
select properties, select hardware & then device Manager)

4, Select view, devices by type.

5, Go to ports and check the USB serial port is set to Com 1,2,3 or 4. If
not then select properties/port settings/advanced and select com 1,2,3 or
4.

6, Insert the cable to your car.

7, Install and run the Vag-Com software.

8, within Vag-Com select options and change the com port to match the one
selected above. Click test and then save.

9, Finally select auto scan and choose your chassis type.

Also please make sure your cars ignition is on!


Tony
www.mediasave.co.uk