Hey guys,

I have just done a torque/bhp run on my octy using vag-com.

The car is standard and the figures i got back are as follows.

max torque 259nm @ 2200rpm

max bhp 182bhp @ 5520rpm

(I didn't take the car above 5520rpm)

What do you think?

Torque seems quite high compared to standard 235nm.

This car is completly standard so far so how accurate is this reading?

Vag-com will tell you that info? Very interesting!

I didn't realise it will tell you your bhp, and especially at specific RPM's???????

you can even produce nice power/torque graphs if you feed the log file into the right spreadsheet

How accurate would it be though? How does the car know what it is producing bhp and torque wise? I thought the most accurate way was a decently set up rolling road? If it does all this accurately, then surely the rolling road has had it's day?

That's four question marks in a row. Not bad eh?

Now it's five.

I think the engine has a torque sensor (or sensors allowing the calculation of the torque)....with vagcom can log, thus you can work out your bhp based on the rpm and amount of torque avail at said rpm. Remember bhp is a function of torque at rpm.

It's all done off the engine sensors maf, map sensor etc as for accuracy i think it's pretty good afaik

i may be wrong though

So am i right in thinking that torque can be measured any where in the rev range?

if so why is mine so high against standard or am i just lucky?

yep, but an engine will (usually?) only create peak torque at/after a certain RPM

Remember this will be values at the crank rather than the wheel which is were Dynos measure it.

My 130bhp TDI graphs like this :

at the crank would be more accurate though, as with RR dyno's when they calculate the crank figures it's all based on partly estimated transmission drag calculations.

Indeed ...

There are 2 possibile explinations for the higher than stock readings :

1) VAG are reputed to be a little conservative on the stated power of their cars.

2) The figures quoted by VAG are measured at the wheel rather than the crank.

My car is supposed to be 130BHP and 229 lbs/ft of torque and it logs at over 150 BHP and 239 lbft

I've heard 1 said a few times, but I don't know about the validity of 2 either way.

Barney

VAG quote the engine outputs by taking the average of x amount of engine runs before the engines go into the cars. So these are all calculated at the crank. (something I saw being done on an Audi factory tour over in inglostadt)

Well that debunks both the theories I'd put forward and just says that both the OP and I are lucky and got engines that are on the high end of the distribution.

yup

yep, it would seem you've got gooduns - a chap on ffoc had a standard 1.8 focus that regularly and repeatedly rolling roaded at ~150bhp rather than the standard 113bhp

yep, it would seem you've got gooduns - a chap on ffoc had a standard 1.8 focus that regularly and repeatedly rolling roaded at ~150bhp rather than the standard 113bhp

What supercharger did he have on it?

was standard other then a panel filter and ran 150bhp on the very reliable PE rollers...you'd be looking at more in the region of 200bhp with FI on standard 1.8 internals

Ive not really played on my VAG COM yet.

What Blocks do you have to measure ?

block 120:thumbup:

It's better on the TDI coz it;s block 20 ... means you can do it on the un registered version with a e-bay cable

So your sat in your car with your laptop plugged in reading block 120.

Then what, just drive and record the data, whats this about 3rd gear ?

Im confused.

Yeah get on a nice road (private of course)

set vag com to log then from low revs in thrid floor it all the way to the blood

stop logging go home and start revelling at your graphs in excel

there quite a bit on ross techs website about logging and converting it into graphs

Yeah get on a nice road (private of course)

set vag com to log then from low revs in thrid floor it all the way to the blood

stop logging go home and start revelling at your graphs in excel

there quite a bit on ross techs website about logging and converting it into graphs

So foot to the floor in 3rd from low revs up to the red line.

Ill give it a blast, just got to find a road now, Ummmmmmmmmmm!

So foot to the floor in 3rd from low revs up to the red line.

Ill give it a blast, just got to find a road now, Ummmmmmmmmmm!

Aye as simple as that do a few runs just to make sure