Hello all,

I have a 03 octavia vRS with 23k miles. Brought the car to be remapped on monday and when i returned to collect it was told thet the 'before' torque was 174.4 which is

correct and the 'after' torque is 226 (he had to wind it back a bit after clutch started slipping). The problem is the 'before' power is 160.5 at 5250 rpm. (the after is 192.3 at 5280 rpm). I would have considered the car to have been running v well before but the figures are from a DYNA PACK chassis dyno (NOT a rolling road with all their faults) and so i would beleive the figures. Does anyone now how an engine that produces the standard torque figure and runs perfectly would see power losses of 18bhp at the higher end??? There are no misfires at the higher end, new mobil 1, Air filter etc. puzzled!

Are these the ones that fit striaght to the hubs?

No idea about dyno's but what about heat soak? This would make the ecu cut back on boost.

But how does it drive is what counts.

The dynopack bolts straight to the hubs, supposedly cuts out all the variables associated with RR's. Car Drives great now, very strong with no lag at low revs. the problem was all 3 runs got the same 'before' figure.

There is still a gearbox between the wheel hubs and flywheel on the engine so there are transmission losses to take into account

Transmission losses have been factored in. the chap who owns the firm says that he has never seen VAG engines produce 'LESS' power on the dyno than stock. Apparently the dyno is accurate to .01%. I have worked out the power figure myself ie torque x revs = bhp at same revs. all points to some engine power loss .

What sort of external fan cooling was used for the power runs?

Hi

There are many things that could limit top end power without restricting midrange torque. Gas flow limiting on either side of the engine may only come into play when the engine is producing maximum power and I would think this would be the first place to look. Kinked air hoses, flashing from mould mis shots hanging in the inlet pipework, out of alignment or mis trimmed gaskets, over stuffed exhaust silencers, big back boxes, poor header jointing (not applicable here I would imagine) all the sort of stuff that can sap top end power.

Electrical problems like an under active MAF or Oxy sensor could encourage underfuelling that will also rob the engine of power. On some "fly by wire" systems, a mis aligned or mis calibrated throttle encoder can basically not request maximum go from the engine. Lastly is the carpet too thick?

Chris