Off to see the Wizard
- Thread starter Nutty
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Which would explain the 'up to 25 BHP difference' lost. If Nutty's bike was run in 'Rain mode' for the first run? Why would the Operator do that?
Was it raining that day on the Dyno.. lol..
Agreed but doesn't a dyno measure max power? so wouldn't full throttle be applied until max power was reached, no matter what the mode?
It would only measure power being applied to the back wheel.
If the throttle was 'strangled' electronically, due to it being in 'rain mode' then the Dyno would only see the power being applied to the wheel. Not whats available.
So a reduced power mode would seriously impact the Dyno result.
Thats what I've been reading before buying bike and experiencing while owning one. In rain mode, crank the throttle hard and dash will light up like a Christmas tree yet throttle response and power delivery is very lethargic. Every mode you go up it changes the character and power delivery of the bike.
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Yes I use all three modes often but still think max power is the same in all three, unless BMW changed it after 2015???
Geoff maps in Dyna for the graph, although the improvements are felt in all three modes. Nutty's engine is tight, he had 122 with the GSA TB with the same exhaust. Drive train reduces output by around 20-25% for a shaft; much less for a chain.
Look at it this way
Normal Mode : 100% Throttle = 100% Power
Rain Mode : 100% Throttle = 75% Power (Controlled Electronically)
Rolling Road see's final result.
So if its in Rain Mode, The dyno will record what power is being applied and assume thats all the bike has at maximum power.
But in reality, the bike has only applied 75% Power because it was restricted electronically
Normal Mode : 100% Throttle = 100% Power
Rain Mode : 100% Throttle = 75% Power (Controlled Electronically)
Rolling Road see's final result.
So if its in Rain Mode, The dyno will record what power is being applied and assume thats all the bike has at maximum power.
But in reality, the bike has only applied 75% Power because it was restricted electronically
I just did and there is no mention in my 2015 manual of it.
Just re-read mine and searched the entire document for '100' and nothing found - so unless BMW have changed something or omitted it from the manual then it would appear that full power is there in all modes.
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No they're not.
The KTM Adv range are knocked back to 100bhp (or GS mode as I like to call it) in Rain & Off Road. The differences between the two being levels of TC & ABS.
Andres
Me too and I agree there is nothing in there
When i had my GSA 14 MY it was as i recall in there
The new spec that i have looked at does not seem to mention it either
The S1000RR has it seems changed its stance on rain mode and instead of dropping it to 153 it now appears to drop it to 180 (This was picked up on a forum )
The XR in rain ( mine) i believe reduces it to 140 that i like to refer to as KTM mode
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I think you'll find it calculates power from measuring torque at the range of rotation speed of the dyno and (I think) the rate of change
Splitting hairs in terminology...it's measuring applied torque, power is a product of torque and rpm.
Which leads me on to my next suggestion....tyres, if there was tyre slippage that would also give lower readings.
Could the Traction Control of be kicking in or the tyres just plain slipping?
My bike was in Dynamic Pro, on the day. When I left, it was still in Dynamic Pro. The 'before' difference is a head scratcher, for sure. I gernerally run my bikes in hard, and don't baby them, so it's had the taps open regularly. I only run the bike with super unleaded, if that makes any diffference.
It's a head scratcher, but cutting through all the white noise, is it better after the visit?
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HilltopMark
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Hi Steve (and everyone else) it's Mark from Hilltop. Geoff almost never gets to post on the forum so I'll step in. I wasn't in the dyno room when either bike was done, but I'll have a stab at answering. My guesses: It's possible that the two bikes in question could have been in different ride modes one the before run but not on the after run. It's also possible that the Akra would make less power on the standard map as the bike would be running even leaner that normal. Given the extra lean running if there was detonation the ECU would retard the timing further, resulting in significant lost power.
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