Fuel mapping for the R1

My R1 is currently with the top guys at Southern Cross Motorcyles in Kilburn for a number of things including a custom fuel map being produced.

Just got off the phone with Andy and he was telling me that the map that was installed gave pretty much optimal fuelling throughout the rev range. This was discovered after extensive time on the dyno.

Now this map was downloaded from the Dynojet website. The thing is though, it was designed for the complete spec of performance parts on my bike. BMC air filter, Leo Vince slip on and Y pipe and Graves velocity stacks.

I guess sometimes, like Dynojet say on their site, a custom map isn’t really necessary.

To be honest, I was pretty happy with the fuelling except just off idle. There was a problem here as the bike would cut out unless more revs were applied. A bit like the TPS fault but that would cause the bike to stall even launching with a big hand full.

On another note, I’ve been reading about the secondary butterflies on the R1. They are apparently installed to smooth the power delivery low down.

Perhaps stereo typically, a German guy off the R1 forum seeking ‘aggressive power’ delivery removed his and said the difference is quite extreme. He said you have to learn to respect the fact that the bike will now give all the potential power on tap in a low gear and from low revs, and it won’t baby you by limiting it.

Some American dudes were saying there is no merit in removing the secondarys because to go fast (especially on track) you want smooth power delivery.

Something makes me want to try this out one day myself.

So who can explain how this secondary butterly valve system works.

Waffle mode off

What…I didn’t fart you know

lol ???

Can’t help you with the techno-bollox I’m afraid. To my eyes your post reads like something Scottie would come out with on Star Trek. Velocity Stacks? Next thing you’ll be telling me you’ve got a Flux Capacitor. If you ask me, butterflies are for dancing across wild meadows or sticking to the wall with pins.

What happened to your plan of spending all your moolah on rider training?

You sssmoking?

Its still happening Bevangelist mate…

Got a trackday at Cadwell on Thurday…Did CSS Level 1 in April and gonna book a training day with the Focussed guys at Mallory Park when I come back from riding around Spain & France.

Are you at BMM on Wednesday?

I’ll be at BMM so I’ll give you the inside line on Focused at Mallory.

I had a go on the CSS pneumatic bike thing at Donnie and the guy made one comment about body position that has made riding so much easier. A whole day in their hands has been added to the wishlist.

‘secondary butterflies’

sounds like they are talking about the Exup vavle in the exaust. It is designed to give more mid range so removing it will give a better top end but will knock off your low down grunt.

A lot of bikes are using secondary butterflies now … not talking about an exup valve here, these are in the throttle bodies of the injection system. The first set are controlled by your right wrist and the secondary set are controlled by the bike’s engine management system to produce a smoother throttle control … and thus smoother power delivery.

Yes…That’s it…Cheers SP.

So the bike is actually not giving you direct throttle response like an old carburreted bike would

Sounds like a total mare to fix if it ever goes wrong. Also sounds like a recipe for disaster if you try removing the secondary inlet valves and get it horribly, horribly wrong. What did the German guy do? Unscrew the butterfly plates from their pivots? That way you could leave all the engine management gubbins in place and not disturb it too much.

Yes that’s exactly what he did I think…

He said, you really really have to remember that you’ve done the mod as the normally well mannered (that’s relatively speaking) acceleration in low gears where the bike gives you traction rather than lifting the front or spinning the rear wheel, is gone and too much throttle will have you on your arse or flip the bike.

For expert use only

Scary scary.