AF-XIED for a standard bike?
- Thread starter MattW
- Start date
Having done about 7000 miles on my TC I can tell you that this will be sorted....best mod I have done. Saved me a fortune as I was considering trading in of an LC but love the bike so much now that I am going to stick with it.
Interesting in that with my standard set up I have tried setting 8 for a while but gone back to 7....seams smoother to me.
comberjohn
Registered user
It'll turn it into the bike that you thought you were buying in the first place.
Like oldnfat, I thought of trading 'up' but now I'm glad I didn't. My last bike, a K1600GT, was so sophisticated and complicated, it caused me sleepless nights worrying about if it went wrong!
Love the TC. Air cooled! No radiator or water pump. It's so (relatively) simple.
Plus, parts and accessories seem to be getting cheaper on eBay now as others change to the LC. Just fitted a pair of the BMW nylon cylinder head protectors that I picked up for £20!
Haven't been out for a couple of weeks as I picked up a rear wheel puncture and was waiting for a new tyre. Wasn't worth fixing the old one.
Heading out for the day, tomorrow. Maybe Donegal.
Now have 40k miles on and expect to get this bike into six figures.
Like oldnfat, I thought of trading 'up' but now I'm glad I didn't. My last bike, a K1600GT, was so sophisticated and complicated, it caused me sleepless nights worrying about if it went wrong!
Love the TC. Air cooled! No radiator or water pump. It's so (relatively) simple.
Plus, parts and accessories seem to be getting cheaper on eBay now as others change to the LC. Just fitted a pair of the BMW nylon cylinder head protectors that I picked up for £20!
Haven't been out for a couple of weeks as I picked up a rear wheel puncture and was waiting for a new tyre. Wasn't worth fixing the old one.
Heading out for the day, tomorrow. Maybe Donegal.
Now have 40k miles on and expect to get this bike into six figures.
Bendy toy
Registered user
I still can't get my head around how the XIED fills the 4000 to 5000 revs flat spot without over fuelling at other revs.
The weak mixture is programmed by the OEM map so I'm still confused. Sad I know.
Sent somehow.
The weak mixture is programmed by the OEM map so I'm still confused. Sad I know.
Sent somehow.
comberjohn
Registered user
Fit a set of AF-XiED units and there is no flat spot. 
I don't know either, but it does. Just back in after a couple of hundred miles up the Antrim coast road this afternoon. Fantastic!
I don't know either, but it does. Just back in after a couple of hundred miles up the Antrim coast road this afternoon. Fantastic!
Roger 04 RT
Registered user
So go with the flow and accept that 6-8% fuel is added to the entire map. The short answer is that a bit too much fuel isn't nearly as bad as too little.
Let's say for the sake of discussion that best power mixture is 12.9:1, which is 10% more fuel than 14.7. (It might be higher or lower but it's likely around that figure.) The flat spot is occurring in the mid-range where the AFR is 14.7:1. At wide throttle and high rpm, I've measured AFRs on stock bikes of about 13.5-13.2.
So in the flat spot, adding 6% fuel brings AFRs 13.8:1, which is very good. At high power that 13.5 - 13.2 might become 12.6 - 12.3:1. That is only 2-4% more fuel than best power. The usual effect of that extra fuel is to reduce CHT, EGT and exhaust valve temps. It's wasted fuel, but the benefit of doing that is great enough that piston airplanes always do that during takeoff.
Bendy toy
Registered user
I'm not fussed about fuelling for maximum power it usually means stinking the whole street with fumes and suffering at the pumps. But as you say running weak can be really harmful to exhaust valves.
Aircraft, especially air cooled, run rich for best power but also to minimise stress on the engine. A fiend of mine was killed when his Cessna Spam Can came down with exhaust valves stuck open. He'd only recently had it in for checking because it had happened before but not so badly.
The American Navy during WW2 found they could back the mixture right down on long flights to save fuel as long as they watched the EGTs and wound up the mixture before they needed to make real power.
Aircraft, especially air cooled, run rich for best power but also to minimise stress on the engine. A fiend of mine was killed when his Cessna Spam Can came down with exhaust valves stuck open. He'd only recently had it in for checking because it had happened before but not so badly.
The American Navy during WW2 found they could back the mixture right down on long flights to save fuel as long as they watched the EGTs and wound up the mixture before they needed to make real power.
Roger 04 RT
Registered user
Good summary of mixtures in aviation. I think you'll find that 6% more fuel is indistinguishable from 14.7 as you ride down the street. The key is adding just enough fuel to get rid of the bad manners--some even find 4% is enough. Lambda shifting, as opposed to open loop solutions, let's the ECU add the extra fuel precisely.
Just a quick update to this thread.
My units arrived (I got stung for duty - boo) and I fitted them a couple of weeks ago.
As people commented earlier, the connectors are a bit of a squeeze behind the covers under the cylinders but I squished them in after cutting the unneeded mounting lugs off the AF-XIED connectors. I mounted the units in the recesses each side of the airbox - hopefully this will be waterproof enough...
I also informed my insurer (because I'm that sort of bloke) and there was no problem or increase to my premium.
And a final question: when they arrived the two units were actually set differently so I tweaked them to be the same. Am I right that you count the 'off' periods? I've set them both to seven 'offs'.
I've not had time to put any proper miles on them yet (bike battery died just after I fitted them) - I did about 50 miles last weekend. The bike feels 'different' - not sure exactly how different as yet but I'm looking forward to seeing how it pans out.
My units arrived (I got stung for duty - boo) and I fitted them a couple of weeks ago.
As people commented earlier, the connectors are a bit of a squeeze behind the covers under the cylinders but I squished them in after cutting the unneeded mounting lugs off the AF-XIED connectors. I mounted the units in the recesses each side of the airbox - hopefully this will be waterproof enough...
I also informed my insurer (because I'm that sort of bloke) and there was no problem or increase to my premium.
And a final question: when they arrived the two units were actually set differently so I tweaked them to be the same. Am I right that you count the 'off' periods? I've set them both to seven 'offs'.
I've not had time to put any proper miles on them yet (bike battery died just after I fitted them) - I did about 50 miles last weekend. The bike feels 'different' - not sure exactly how different as yet but I'm looking forward to seeing how it pans out.
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comberjohn
Registered user
Welcome to the (very small) club!
Sounds like you've set them ok with 7 blinks. I've mine at 8, but it's hard to tell much difference between 7 or 8 in practical terms.
No worries about waterproofing. I've mine stuck on the side of the air box with double sided tape. Seem to remember seeing a pic of one in a glass of water to demonstrate how waterproof they are.
My insurance company wasn't bothered either. Sent them a link about what they did from Beemer Boneyard, but no worries.
The changes are very subtle and gradual but you'll notice changes fairly quickly. The makers reckon up to a thousand miles for full adaption.
You will shortly have the bike you thought you were buying in the first place!
Sounds like you've set them ok with 7 blinks. I've mine at 8, but it's hard to tell much difference between 7 or 8 in practical terms.
No worries about waterproofing. I've mine stuck on the side of the air box with double sided tape. Seem to remember seeing a pic of one in a glass of water to demonstrate how waterproof they are.
My insurance company wasn't bothered either. Sent them a link about what they did from Beemer Boneyard, but no worries.
The changes are very subtle and gradual but you'll notice changes fairly quickly. The makers reckon up to a thousand miles for full adaption.
You will shortly have the bike you thought you were buying in the first place!
If one of ye lads with this electrickery fitted move your bikes on in the near future.......please think of me when selling on the electrickery!!!!
comberjohn
Registered user
Stop rubbing it in!!Why would we be thinking moving our bikes on? They're almost perfect now.
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comberjohn
Registered user
When I went to the factory in Florida I considered buying ten as they are tiny and flogging them on here but I bottled it.
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I inquired about becoming an importer for them, but they preferred to have a motorcycle dealer.
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