Discussion
Having had a fair bit of work done in 2013 my car was then mapped to 491bhp & 427lbft by Trevor at Track n Road.
Here's the RR graph:
Last year I had a new exhaust (BCS powervalve) and fitted the pro-alloy hardpipe kit. On the previous mapping the car was already fitted with a dual stainless system.
I recently had a power run on another well known RR in the Noble community (that apparently has a reputation of sometimes rather optimistic figures...) and found I'd lost 23bhp & 15 lbft. Also, the power drops off rapidly at the top end. Graph here:
Is it likely the mapping just needs tweaking to take into account the changes or does it point to an issue?
Here's the RR graph:
Last year I had a new exhaust (BCS powervalve) and fitted the pro-alloy hardpipe kit. On the previous mapping the car was already fitted with a dual stainless system.
I recently had a power run on another well known RR in the Noble community (that apparently has a reputation of sometimes rather optimistic figures...) and found I'd lost 23bhp & 15 lbft. Also, the power drops off rapidly at the top end. Graph here:
Is it likely the mapping just needs tweaking to take into account the changes or does it point to an issue?
23bhp out of 491 is just 4.6%.
I work with an engine dyno system that cost £10M to build, and controls everything to 0.1degC 0.2kPa, and i quote +- 1% full scale error in flywheel power as the absolute best possible
You have run on two different rolling roads, on different days, and are measuring power at the wheels. frankly, ime +-10% is typical!
(and the power drops off at the top end probably because the operator lifted the throttle once they had seen power peak)
I work with an engine dyno system that cost £10M to build, and controls everything to 0.1degC 0.2kPa, and i quote +- 1% full scale error in flywheel power as the absolute best possible
You have run on two different rolling roads, on different days, and are measuring power at the wheels. frankly, ime +-10% is typical!
(and the power drops off at the top end probably because the operator lifted the throttle once they had seen power peak)
Apparently the way it dropped off around 6.5k is typical of a car with standard valve springs, but mine has the upgraded ones. No mention of lifting off, as the operator was a bit concerned at the tailing off?
Will probably look at getting the map tweaked to take into account the now slightly different setup
Will probably look at getting the map tweaked to take into account the now slightly different setup
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