Keys fuel mod
 

Hi all
Does anyone know if it's OK to fit the fuel mod without fitting the 02 controller. I will buy one but not for a few weeks. I have just added aftermarket cans done the air box snorkel mod added a K&N air filter and the keys fuel mod should be here next week so want to fit it straight away. But will not have the 02 controller for a few weeks. Title should say kevs fuel mod not blood keys predictive crap

Ive got pretty much the same set up as you & the mod made a big difference. haven't got round to getting the O2 mod yet but its on my list

The kevs fuel mod does not work without the 02 sensor fitted if you have the 2007 bike on with the sensor on the headers

Not my experience and I have the said 07 with a Lamba.

I asked kev 3 days ago who makes them as I just bought the fuel mod for my 07 xt660r and I asked him is it ok to fit the fuel mod before the 02 controller turns up as not bought it yet buying it this week. And he said no you have to fit the 02 controller with the fuel mod or the OEM 02 sensor on the bike stops the fuel mod from doing its job And he is the one that makes them ? He said if you fit the fuel mod the OEM 02 sensor will just take the extra fuel away that the fuel mod adds so you have to fit both mods for it to work right which make perfect sense.here is his reply to me asking the question......

‘You can fit the fuel mod but the O2 sensor will just take the fuel away that you add, yes you need both mods to work together’

To clear things up & give a more detailed explanation but wont go right into depth, the adjustable fuel mod & O2 controller for a XT660 with O2 sensor target different areas of the fuel injection system.

The Adjustable fuel mod will alter/correct the open loop mapping under accelerations & higher rev ranges, it corrects the AFR for hardware that has been fitted like free flow pipes & free flow air filters & lean AFR's in the open loop mapping.

The O2 sensor closed loop circuit only works at part throttles when your throttle is steady & will remove any fuel added by the adjustable fuel mod in this area only at part throttles, as soon as you start to accelerate the ECU switches to the open loop & the Fuel mod will come into play again.

When we fit a Fuel mod + O2 controller the O2 controller corrects that lean AFR in the closed loop at part throttles the whole throttle AFR range open & closed loops are nice & smooth with a rich AFR.

I was quite pleased with my fuelling mod but not half as much as the Power Commander I currently run.

Two different tuning tools, the fuel mod adjusts the Yamaha fuel map across the whole map, a PCV corrects each fuel cell within the Yamaha fuel map.

One is cheap to buy the other costs 5 times more, if one has the funds I would always recommend a PCV with a custom Dyno tune.

Hi kev I need to buy one of your 02 controllers I bought the fuel mod off you 3 weeks ago to put on my 06 bike but am now putting it on my 07 bike so need the controller. Would rather by direct if pos if price is better thanks

Not sure why you contacted me through EBay as you have my direct Email address or a PM here would work better.

EBay has been giving me a hard time lately, I had my EBay account suspended for 7 days a few weeks back as they suspected I was trading out of EBay & I was not, I direct someone to this forum for fork spacer mod measurements, I don't even sell the spacer mod on EBay or anywhere but they still suspended my account for 7 days, so I am very limited on what I can & cant say on EBay, I cant even say contact me on the XT forum as that would be classed as trading out of EBay & would lead to a 30 day suspension. If anyone ever needs to get hold of me a PM on this forum would be my first choice.