My Dyno Run

[GT3]

The first run peaked at 121.8kw @ the wheels at about 5600rpm in 4th gear.

My first run pulled 140kw at the fly wheel.

That calculation/conversion is wrong - 122kw atw is around 150kw at fly.

[balkanac]

How do you calculate that? is there an online calculator somewhere or is it just a fomulae?

[SoVeReIgN]

How do you calculate that? is there an online calculator somewhere or is it just a fomulae?

Ah usually its
15% - FWD
20% - RWd
30% - 4wd/AWD

(Roughly - Little more for autos)

[Timbo]

Ah usually its
15% - FWD
20% - RWd
30% - 4wd/AWD

(Roughly - Little more for autos)

I wonder what the source of this is? Not disagreeing, but these 'rule of thumb' get rolled out on most car forums, and I've yet to see someone reference a good technical source.

Engineers? Discuss:

[SoVeReIgN]

I wonder what the source of this is? Not disagreeing, but these 'rule of thumb' get rolled out on most car forums, and I've yet to see someone reference a good technical source.

Engineers? Discuss:

Through experience I guess

Think about it - Your standard polo gets about 94kw at the wheels - Thats about 85% of 110kw = 15% drivetrain loss.

[mitch_gti]

for an otherwise standard GTI, 121kw ATW seems fairly accurate.

I think i remember guy mentioning 125kw atw on polo gti after APR.
4kw would be dyno error.
1.8t seems to be fairly consistant in its power output. ie everyone in standard form is getting between 91-96 kw atw (mine got 93.something IIRC)

Falcons have a variance of like 30+ kw lol.

[GT3]

Through experience I guess

Think about it - Your standard polo gets about 94kw at the wheels - Thats about 85% of 110kw = 15% drivetrain loss.

FWD cars - add 10 bhp to the wheel figure and divide the result by 0.9
RWD cars - add 10 bhp to the wheel figure and divide the result by 0.88
4WD cars - add 10bhp to the wheel figure and divide the result by 0.84

[archangel_7]

Change your downpipe & turbo intake pipe and you might hit the 130.

Hey Sovreign,

130kw is a big gain just from changing the downpipe and turbo intake... just out of interest, how would you go about doing that? parts, etc?

[Jarred]

yea it's all really confusing. but the most important, is qhat it puts out at the wheels really, since they do all the moving!

regardless, I think it's time for a few more mods my man!!

[MACCAA]

Hey Sovreign,

130kw is a big gain just from changing the downpipe and turbo intake... just out of interest, how would you go about doing that? parts, etc?

130kw is in addition to a reflash.Reflash=122kw approx.Reflash + exhaust=130kw approx.