Anyone had their LCR rolling roaded in hot weather?

[paradigm]

Got back from PowerStation in Tewkesbury today where I ran my LCR on the rollers with a group of guys from another forum I visit. I am a little confused with the results though:

241.8 BHP at the fly, but only 150 BHP at the wheels.

1) should my transmission losses be that high!
2) if the air temperature was 30ºc, surely my car should be down on power, so how is it pushing 241.8 BHP?
3) Any way to tell if the old owner REVO'd it (or similar)?

I'm unsure now if either the rollers were that shoddy, or my car isn't as standard as I thought.

Any ideas guys?

 

[andycupra]

did it plot boost?

and yes there was a rolling road day not long ago that was as hot as today.
several LCRs ran.

the results dont sound correct...

whats the torque figures?

 

[GaryM]

Sounds strange seeing as rolling roads measure wheel power then calculate flypower based on wheel power + coastdown losses.
Not sure how they come to 241hp when it only measured 150whp, 91hp losses are unrealistic

 

[Pabs]

91 in losses? Crikey - somethings not right there...

 

[GaryM]

Definatly not, acceptable losses seem to be around 40hp which would give him a fly figure of around 190bhp, something not right there either!
I'd completely dismiss those figures unless your car has a problem.

 

[Vicky M]

have a look at the marlin engineering thread, loads of peeps were disappointed with results, but it was 30+'c
http://www.seatcupra.net/forums/showthread.php?t=87104&highlight=marlin

 

[paradigm]

Definatly not, acceptable losses seem to be around 40hp which would give him a fly figure of around 190bhp, something not right there either!
I'd completely dismiss those figures unless your car has a problem.

Well judging from how it drives I'd say it doesn't have a problem, and VAGCOM doesn't report anything at all.

The torque figure was 308NM.

 

[The_one]

mate as ive explained on ocuk powerstations rollers are fine they are not designed to measure wheel horsepower, they are calibrated to measure fly power.

you need a dynojet rollingroad with a single roller to get true wheelhorsepower figures.

Also when you was on the rollers were they spraying co2 onto the coolers?

 

[The_one]

Here you go this is how powerstions rollers work.

The dynamometer measures drive wheel torque [Nm] and drive wheel speed [1/min (rpm)] (and/or engine speed [1/min (rpm)] where applicable). The physical relationship between Torque, Speed and Power is that torque times speed results in power. The equation using SI units is:

P = M x w

where
P is power, expressed in W
M is torque, expressed in Nm
w is angular velocity, expressed in rad/s

 

[paradigm]

mate as ive explained on ocuk powerstations rollers are fine they are not designed to measure wheel horsepower, they are calibrated to measure fly power.

you need a dynojet rollingroad with a single roller to get true wheelhorsepower figures.

Also when you was on the rollers were they spraying co2 onto the coolers?

They were spraying water mate, not carbon dioxide

And they sprayed it on one of the coolers, not both

 

[GaryM]

Calibrated to measure fly power? Don't you need a bench dyno to do that accuratly?
I thought all chassis dyno's measured torque at the wheels (via time it takes to rotate a set mass and load) then went from there?

 

[GaryM]

you need a dynojet rollingroad with a single roller to get true wheelhorsepower figures.

Plenty would disagree with that, I measured 226whp on a dynojet which is laughable really.

 

[The_one]

Whats your fly figure gary

 

[GaryM]

On the dynojet its around 235hp which shows ~9hp losses!

Considering the mods I have I think a reasonable fly figure would be around 240hp and 200-205whp.

 

[LCR mat]

I had mine done once 30 degrees- next to no cooling- the guy reved feck out of it on the rollers to get the tyres tacky then did a power run which lasted over a minute- got 205 bhp at 5K cant remeber the loss though transmission exactly but it was 30 or so

 

[The_one]

As long as it feels quick on the road thats all that matters imo

 

[neil_f225]

As long as it feels quick on the road thats all that matters imo

would agree with that...rolling roads are such a lottery! To many people get obsessed with quoting power figures.

 

[bigjode]

As long as it feels quick on the road thats all that matters imo

But then why do so many people go on RR days?

 

[GaryM]

would agree with that...rolling roads are such a lottery! To many people get obsessed with quoting power figures.

I fully agree, take any figures with a pinch of salt.

 

[bigjode]

I know its totally Off Topic but how did you discover this forum Gary?