thnx john

If you want to reliably measure an engines output you need a bench dyno (engine out)
Next best thing is a hub dyno (bolted to driving wheels).
Roller dynos are notoriously inaccurate due to many factors:
1. Calibration required (as with all) more often than owners usually do
2. Coast down calculation to work out drive train losses isn't accurate
3. Tyres slip on rollers
4. Greater the power, less accurate
5. Special little tricks operators do to boost the reported bhp figures
    e.g. coast down should be natural, using the brake to slow the rollers creates a false larger drive train loss calculation and therefore adds more to the base wheel figure
6. It's a black art and there are some real charletons out there
7. Temp, humidity, airflow etc all produce variations

Don't get hung up on the figures they produce. Over 10% variation is common between standard cars on a dyno, when in fact they're producing the same power.

It's a bit of a laugh, unless you pay real money for a proper session on some decent equipment. 

Ok guys, we did another test on another dyno. It was incredibly hot (32C) and there were some funny results in the end:

Abarth GP (mapped allready): 163 HP, 287 Nm of torque

I was expecting the power figure to be higher although I am fully aware results can vary a lot. Namely, if I compare this result to the old testing (same dyno, but much colder), the power is pretty much the same - it's the torque where I gained mostly. Also, the graph seems to have a wider range (will upload tomorow) of usable power than before.

What I found impressive was my friends Golf VI 1.4 TSI (122). It produced 136 HP and 200 Nm of torque. My other friends GP T-jet (also mapped) only managed 130 HP but impressive 240 Nm of torque.

EDIT: results here



(the pale colured lines are from the old test just to see the difference)

And some figures:

- max power (DIN corrected) = 162,7 HP (5175 RPM)
- max measured power = 155,3 HP
- on wheels (DIN corrected) = 147,3 HP
- max measured power on wheels = 140 HP
- max torque = 287 Nm (3300 RPM)

Considering it was damn hot I'm fairly satisfied

This a remaped GPA right? Clearly it must be since the torque curve is completely different from a "regular" ones I've seen (and there's been many)...
Now, as for the figures - even for a remaped GPA the seem a bit optimistic? Did you do any incar acceleration videos? Would love to see them!

F

Ah, that explains the curve! Man, I'm starting to dream about a bigger turbo
Once again, nice figures...

F