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AIS Removal
4 Attachment(s)
DISCLAIMER: YOU DO THIS AT YOUR OWN RISK AND MAY VOID THE MANUFACTURERS WARRANTY.
AIS Removal/ Disable: To disable the AIS all you need to do is disconnect the blue plug that comes out of the top of the pump which is located behind the horn. http://www.xt660.co.uk/attachment.ph...1&d=1147380484 Unfortunately the only way to do this is to remove the seat, side panels, tank panels and then unbolt the tank. Instructions for removing the panels can be found in your Yamaha owner�s manual. Do not disconnect the fuel lines to the tank, you should be able to slide the tank far enough back to give you access to the pump. http://www.xt660.co.uk/attachment.ph...1&d=1147381020 Disconnect the blue connector, i used some electrical tape and taped over the exposed connector on the pump. Then I used some Vaseline and covered the end of the connector http://www.xt660.co.uk/attachment.ph...1&d=1147381020 DISCLAIMER: YOU DO THIS AT YOUR OWN RISK AND MAY VOID THE MANUFACTURERS WARRANTY. |
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AIS :air induction system burns unburned exhaust gases by injecting fresh air into the exhaust port , reducing the emission of hydrocarbons. When there is negative pressure at the exhaust port the reed valve opens allowing secondary air to flow into the exhaust port. The system also has an cut off valve that is controlled by the signals from the ECU.The cut off valve opens to allow the air to flow during idle and closes to cut off the flow when the moto is being driven. However,if the coolant temperature is below the specified value the valve remains open and allows the air to flow into the exhaust pipe until the temperature becomes higher than the specified value. Also if you unplug the AIS there is a mechanical function as well, where it drags in air when there is a vacum in the exhaust. e.g. on R1 and other yam bikes they disconnect the hoses and block the holes. |
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The way the AIS is set up, it is only for emission control & should have no effect on the running of the bike unless you are running with STD Pipes. Something I was thinking about, if you block off the pipe from the airbox to the AIS, if it would change the air pressure in the airbox. In theory as the AIS runs it will cause a lower depression in the airbox affecting the air pressure sensor, a flat spot as you crack the throttle. Would be an idea to get someone to try my thought in practice, on the Dyno. With the air pipe blocked then unblocked to see if it makes any difference. If you are running STD pipes I would not disconnect the AIS. You need to heat up & burn off the Cat for the exhaust to run correctly. |
Im sure johnny has has run his bike on the dyno with and without the AIS ,I cant remember what his post was on the outcome,Im sure there was no benifit eitherway though.
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Can I add something else to the mix. As a part time thing, I have been collecting stacks of information about exhaust systems and their design.
One very interesting thing I came across is where some exhaust builders actually drilled small holes in the header pipe, to induce air to the exhaust flow. The theory behind this has nothing to do with the catalytic converters, but actually to boost power output. The air, or rather O2 introduced into the header, would ignite some of the unburned fuel, and actually speed up exhaust flow. It also increased exhaust temperatures, and the hotter the exhaust gas, the faster if flows. Some racers even go to the extend to wrap the headers with exhaust wrap, to maintain exhaust gas temperatures and flow, and this wrap actually works. The hole in the exhaust is just another way of doing something similar. The way I understand it, the AIS will close at the right temperature, or high RPM. Has anyone tried running the motor with the AIS either on, all the time, or, the hole open, to see if it actually boost flow, and maybe increase high end RPM power output? It might just be worth while leaving it open. I have no idea what the end result will be, or if it will be bad for the stock pipes, but on an aftermarket exhaust, it might be worth while trying it. |
There are a doubt in my mind....
If a disconnect the AIS plug, its generate a error code on a ECU system? |
No it doesn't display any error messages. So don't worry about it.
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I�ll try and report heare... By! |
Ais Removal
I removed and blocked my AIS /valve , pipes.I tune motor vehicles.On A car its clled an EGR valve.
And as a Race car builder,we remove this valve for better performance. It made my bike a bit richer,and it wheelies better now.I have Akropovicks fitted and a K&N Airfilter. See this link.. http://en.wikipedia.org/wiki/Exhaust_gas_recirculation :rockwoot: |
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A.I.S stands for Air Induction System & must not be confused with EGR which is Exhaust Gas Recirculation. EGR systems re-breathes the exhaust gases under curtain driving conditions & will make quite a difference to power. If blocked off there will give a power gain AIS on our XT's or Secondary Air Systems as in the motor car industry are used to get the cartelistic converter to operating temperature as quick as possible & reduces hydrocarbon emissions. A valve opens which allows fresh air from the filter part of the air box it to enter the exhaust header after the exhaust valve, it adds oxygen to the exhaust gasses coming out of the header, this in turn make the gases super hot which in turn heats up the cats faster which reduces hydrocarbon emissions. The AIS value normally operates according to coolant temperature & works mostly from cold. http://www.yamaha-motor.ca/technology/technology.php?group=M&tech=AIS If you are still running Cats I would not recommend that you to disconnect the AIS, your Cat could clog up if you only travel short distances. Removing the AIS with aftermarket pipes will reduce the popping back sound by 99%. The bike will smell richer as there will be more unburnt fuel exiting the pipes. I have always had mine connected, as when I did the test on the dyno there was no gain having it connected or disconnected. |
Some new information has come to hand on the AIS system.
Freez has found by disconnecting the AIS at it's electrical connector & leaving the system unblocked caused the bike to run richer low down on his Dyno. In my comments on the above thread I tested my bike on the Dyno & crimped the intake hose from the air box to the AIS & it made no difference on the Dyno. Two ways of disconnecting the AIS with 2 different results. |
Hi Kev.
Just a correction from my side and apologies if I confused everyone. The reason why the bike was running rich with the AIS's power removed was because it flowed fresh air into the exhaust all the time, making me, or another tuners think the bike is running leaner than it actually was, so we added more fuel to get it to the ratio we normally tune for. But in fact, that was the incorrect method of doing things, as the AIS was just messing with the A/F ratio readings and did not reflect the true A/F ratio that is supplied to the engine. You have to block the breather pipe leading to the AIS when you tune this bike, or you will tune wrong. The AIS by itself, working correctly or disconnected will have no affect on the A/F ratio of the bike. Only place it can cause a mess with is on the 07 models with the O2 sensors. Unplug the AIS on the 07's and the ECU will think it is running lean and add more fuel and mess up the correct fuelling in the process. |
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All makes sence, now I can stop thinking. I could not see how it made the fuel mixture richer, but it was making the gas anerlizer think it was lean HHH & so you made the fuel map richer. Something to remember when making a fuel map for a Power Commander. You can blank off the inlet hose from the airbox to the AIS, but don't just unplug the AIS otherwise your fuel map will be make incorrectly. Thanks Freez valuable info for the forum members. |
outcome ?????
Evening All,
So is the final outcome to leave plugged in and all connected as standard, or leave electric plug in but pipe blocked, or pipework normal and electric plug off !!?? I have plug off but pipework untouched at the mo. I felt ( before disconnecting plug) at low revs creeping through traffic you could hear the ais valve opening and closing and this caused a slight surge. 2007, xtx, ackra pipes, Happy christmas to everyone.:023: |
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The verdict There is no gain in power by disconnection the AIS, it may help with poping back of the exhaust on over run when using after market pipes by 99% less poping. It will help with the burning of hydrocarbon emissions if connected. It will effect the results of a fuel map if you are running your bike on a dyno setting up your Air/Fuel ratio & the AIS is just unpluged at the electrical connector & not blocked off at the air intake. |
OK, I have now blocked air pipe to ais (from air filter box) and reconnected electrical plug. It dont seem to smell so rich for sure but i feel thou as you let off throttle and the bike is slowing down through engine braking, after about 3 seconds it feels as something changes and all engine braking is lost, and the engine want to run on ???? best noticed at slow speeds in 2nd or 3rd gear. im not sure this is due to the changesof made. ??? anyone elso noticed the running on feeling ? and is there anything to reduce it. Thanks. Happy new year to everyone !!!
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tps
After thinking about what i just put in last message and reading through info on tps adjustment i think by setting the tps back a tad may reduce the run on.
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I have the same setting: xtr, 07, acraps. and all I want is to reduce poping back of the exhaust. |
If you unplug the AIS electrical connector the valve will remain open all the time passing air into the exhaust, which will cause the popping noise.
That is why you block the intake hose to the AIS & leave the connector connected. The valve will then work as normal but will not allow any air into the exhaust system. If the bike is on the dyno & the AIS is still connected it will effect the readings on the dyno's CO reader, it will say it is leaner then it really is & a incorrect fuel map will be made by the dyno tuner. |
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You can unplug the connector if you want but is not necessary. Once the intake pipe is blocked off the air flow is stopped & having the connector on or off does not make any difference to the air flow. |
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my last question: like AIS confuse dyno, will blocked AIS confuse ECU by false reading of lambda sensor ? btw, are there any instuctional pictures for blocking AIS ? can I just block them with duck tape ? |
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Have a look in the mod section under 6/ AIS removal. http://www.xt660.com/showthread.php?t=630 |
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just another thought: what if i disconnect ais hose from airbox, than wrap plastic exit pipe on airbox with tape and put hose back on that wrapped plastic pipe ?
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You could then fit one on the air box exit & then push the AIS pipe over it. |
I done this today , and its better smoth on riding :066:
thanks ! |
I wish I knew what you guys talking abt, I mean I know where it is and stuff but yamaha put it there for a reason disconnecting it would be I dont know... trast yamaha!! Hahaha:sad3:
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Hi there from Finland!
I bought a 660x -06 and it has Leo�s, Powercommander and a "airpowerfilter". I read this topic and checked My bike and saw that then connector of AIS in not connected. I did not see that the pipe to the airbox is blocked. One of the previus owners had wrote to the ownermanual that the CO-level is raised from 90 to 110. If the connector was off at dyno but not blocked from the airbox the bike is running on rich mixture now because the CO measurement wasnt correct? I�m a little bit confused about shouldt the connector be off or on? I dont mine if the bike makes popping sound only that it would work as it should. Thanks for Your oppinion. |
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On a 06 motor there is only a small improvement when blocking the AIS off as this ECU has twin spark, from 07 on wards you have a single spark ignition system & about an 95% improvement in reducing the popping back when the AIS is blocked off. |
Okay, I�ll block the hose if there is some difference to better performance.
What do You think about the fuelmixture? Could it be wrong because the hose isnt blocked and the powercommander has been adjusted the hose open? |
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Blocked the hose from the airbox to AIS and the hole to airbox.
I must say in My case bike runs much better in low rpm and throttle. I�m taking the bike for dyno 4.5.2010 so then well see is the fuelmap ok and how much does it pull...:Driving_6XFY3G: |
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