Pash,

Many thanks for the reply.

Ref point 1 - thanks for confirming the I can trial the other ECU, but first I need to find a clean BUE2D factory file for comparison (I can't find one on the web) as I do not know if the ECU has already been reflashed.

Ref point 3 - I'm not looking at AFV (which is fixed at 100) but the Air Fuel Ratio for Front and Rear cylinders. They seem to be unbalanced if AFR1 is 107 when AFR2 is only 50. Surely that means over twice as much fuel in one cylinder compared with the other?

I may have to fit HD plugs then if Iridium are so bad - have I wasted a few quid?

Again thanks to everyone for the help so far.

A

AFR or AFV?

Remind us what year it is? 2010?

_________________
08 Specialized Langster

Pash,

It's an 09 model (reg is 10 but no second O2 sensor).

I'm looking at AFR variations, not AFV which is set to 100 and never changes (I set it to 105 but it reset back to 100 within a minute of startup....).

My understanding is that AFR1 is front cylinder, AFR2 is rear. 117:50 seems a very unbalanced ratio.

I'm going to run the BUE2D ECM - I've compared the maps I have (still no definitive factory maps) and the BUE2D seems leaner at lower revs/high throttle openings (1500-2400 revs, TPS > 80, and richer elsewhere (higher revs and all TPS <40).

Thanks as ever.

A

AFR should be between 13.2 and 14.7. As you have no front O2 sensor you will not have a way to calculate the AFR on the front. It sounds like you might have a 2010 EEPROM content in the ECM and it reacting to a reading 0V as a result of it being open circuit.

_________________
08 Specialized Langster

Good luck Pash !

_________________
Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

Is it a log you are looking at? What are you using to log your data?

_________________
08 Specialized Langster

Pash,

Log attached, plus screenshot - I have attached the current EEPROM too if needed.

I do appreciate the help everyone is giving, and I realise you have a living to make, Maz - I try to research previous answers first to avoid time-wasting.

I'm no expert but bike runs OKish, I'm just trying to improve low speed fuelling and reduce fan On time/heat levels.

Maz - once I get the bike running, I will visit (my Mum is in Cheshire) but I need to trust the bike won't overheat on the way first!

Cheers,

A

Other attachments - didn't realise you have to click to add....

A

_________________
08 Specialized Langster

Pash,

Didn't answer your question did I?

I am using ECMDroid and Buelltooth to log, then saving as .BIN and .MSL

Viewing in MegaLogViewer (and TunerPro sometimes). I got the AFR1 and 2 readings off the log file attached using MegaLogViewer.

I have ECMSpy but only for the BUEZD ECM.

The only change I have made is to try and reset AFV to 95-105 range (but it resets to 100) and turning on the AMC again as the bike had a "Stealth" (oh, the irony) exhaust when I got the bike, now back to standard.

Thanks as ever.

The ECM droid is the problem giving you a false AFR measurement. A narrow band sensor is a switch, it switches from 0 to 1V when there is no excess oxygen, i.e. stoichiometric. It only knows when it is rich and it only knows when it is lean and it doesn’t know how much by.

_________________
08 Specialized Langster

Pash,

Thanks for that - yet again! I'll assume the AFR mis-match is due to ECMDroid rather than really happening.

Next move to fit the BUE2D ECM and see how that performs.

Cheers,

A