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Old 02-09-12, 00:22
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Kev Kev is offline
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Correct the air temp is always been read even in the closed loop, but any adjustments made to the AT sensor will be over ridden by the closed loop circuit.

My fuel mods have been update with 4 different versions over the past 6 years it is connected in series to the AT sensor, I know of better ways to build the mod but it's all about the cost of the mod in the end, the main purpose of my mods is to make them as cheap as possible to the guys that can't afford expensive fuel mods. I removed all the info on how to make your own Kev fuel mod from the open forum because there was member on this forum that decided he would mass produce my fuel & spacer mods & start to sell it for himself. The info is still avaiable to supporting Forum members to make their own through the ASK Kev section.

I always offer proof of my mods by means of Dyno runs or other means.

http://www.youtube.com/watch?v=glkdBO8aZm0&feature=channel&list=UL

Part of a discussion we are having in the ASK KEV section at the moment were I cover this type of info in detail.

There are 2 sides to a fuel map, closed & open loop circuits.

A Power Commander or any other type of fuel mod can only adjust the fuel map in the open loop, the open loop circuit is when the the ECU sees sudden acceleration, any RPM above 4500rpm & all throttle openings over 20%, cruising or not cruising.

The closed loop is used for emission control, it comes into effect after a coolant temp of 70 degrees C, when the ECU sees a constant throttle opening of below 20% & below 4500rpm, the ECU takes voltage readings from the O2 sensor & will lean the A/F ratio out until it sees a A/F ratio of 14.7:1.

The resistor type Eliminators do not work we have proven this, at the time of proving they do not work Dynojet pulled all the XT660 resistor O2 eliminators from their for sale lists. The ECU constantly looks for 0 to1 volt square wave signal, by unplugging the O2 sensor & fitting a resistor it sends a constant voltage signal to the ECU, after a few min's the ECU see this as an corrupt signal & then constantly switches the A/F ratio up & down, in this state the bike is not tuneable. Below the You Tube test is with a resistor type eliminator connected & the A/F ratio has been data logged.

http://www.youtube.com/watch?v=ZwTfuwZZ848&feature=channel&list=UL

The only 2 types that have been proven to work are Dynojet O2 Optimizer & my O2 eliminator/controller.

I have 2 types of O2 eliminator/controller one completely turns off the closed loop circuit & the latest type controls the O2 sensors voltage outputs.

By controlling the closed loop circuit we are able to reduce the surging when you are cruising, with one of the latest O2 devices when the ECU switches between the open & closed loop circuits the transition is much smoother as the A/F ratios are closer to each other, see table below.

Open loop for most HP & Torque= 13.2:1
Closed loop A/F ratio = 14.7:1
O2 Optimizer or kev's latest O2 controller = 13.6:1
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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946


Last edited by Kev; 02-09-12 at 02:37.