Motorcycle and AF gauge and sensor

[xxdrac]

The Vems A/f gauge was recommended to me for my bike, don’t remember ever seeing on a street bike before so this could be 1st unless anyone hear has seen or fitted one to a bike all info would be greatly appreciated, As my bike has been built and set up by me almost from start to finish in me living room Much to the amusement to the other 3,000 members of XJR web site I help to run , now im running 75 Bhp of nitrous in a single shot  the A/f setting are a bit more or a concern to me now , but cost is now getting to be a major issue with my bike L Bike running great right now , it’s a bit mental but a lot of fun ,  so would like to know what you all think on this set to my bike

Oki my thinking is on my bike the 4 down pipes all go into a collector box / divider under my sump, only purpose is to separate 4 pipes into 2 which then output to a can on each side now in-between each can outlet there is a balance pipe that allows equal pressure to each zorst can this would be a great place for an wide band sensor as the balance pipe is removable and would b easy to weld on and wide band adaptor but my question do you need a certain amount of heat gas flow and do sensors have to be mounted at a certain angle to gas flow

Only want the simplest set up don’t need to log anything there is no remapping or injection on my bike its all fixed only way to adjust is to rejet each carb and or nitrous ect , which in its self is so easy but each change need a dyno run at £30 a pop but if I knew my perfect a/f of gas and on well ya get idea :-) I can get it close just from feel of bike when too rich goes like a dog when too lean goes to feking well lol, I say lean I mean when its so close to perfect slightest change in ambient temp out side and could go over into a lean burn

also I do not have any way of adjusting my ignition unless I fit a dyna 2000 but have been a fair few probs with this set-up on bikes like mine so nitrous always has to run at stock timing  , but coils leads ect have all been replaced and upgraded infact most of my bike has been upgraded

think of my engine as a big lump and carbs and that’s it LOl back to basics

Hears a Pic of bike and hope to run at Santa Pod on next RWYB !!!!!!

Thanks

Tezz

[rob@vems.co.uk]

Nice tool that   Seems to be blocking the TV, but I'd rather look at the bike than the rubbish on the box

The sensor is best mounted 90degrees to the gasflow so that the gas passes across its 'nose'.  You can overheat these sensors so a little way back (at least a foot or two) from the ports is best. A lot of rolling roads have a probe that they put in the back of the exhaust pipe, these tend to be about a foot and a half of pipe that feeds the sensor.  You could consider mouting just before the silencer, or try and get the sensor as far off horizontal on underside of the bike as possible.

And I'd be putting an EGT sensor on the pipe of the hottest cylinder about 6 inches from the port exit.

The one downside of the guage is that the button on the front is not water tight as we use an air gap to vent heat from the high current drivers inside the gauge.

[xxdrac]

water tight might not be a problem i hate to get wet as much as me bike :-) and would just carry a zip lock bag and a elastic band incase of rain , the distances for the wide band sensor you suggest do put it almost in the link pipe i want to use , unless the ETG sensor can also go there i will just leave it off as im def not going to drill and weld down pipes , is the unit a plug and play device as in do i just fit conect and use is it all set up ready to go out of the box

Just really need real time on road A/F both on and off Nitrous temp would be usefull

Done a search every where dont seam to be able to find 1 link of this sort of stuff fitted to a street bike , still i suppose theres always a 1st

Thanks tezz

[xxdrac]

few more things dose gauge come with anysort of mounting pod or system and are the sensors supplied with that adaptors you weld on exhaust or do you need all these on top

Thanks

[rob@vems.co.uk]

The gauge comes with the wideband sensor, the EGT sensor is bought seperately - you can choose to buy it later if you prefer.
As the gauge is designed for a car it comes with a u shaped bracket that is designed to clamp the gauge to the dashboard. Its a standard 52mm system so a mounting pod may be available - I'm not sure about the motorbike market.

As for connecting it up its just a case of connecting + &- to your switched powersupply.

I've not seen one of these fitted to a street bike either, theres always got to be a first!

[xxdrac]

Thanks 52 mm same size as my steering damper fork clamp so thats given me a few ideas for mounting to bike have seen a basic rear pod that may be adapted to just make it look neat and may need to add an on/of power switch as well just incase i have to cover it up in a sealed bag due to rain as you said ya use button to cool it , but nothing so far suggest to me its cant be fitted used and look good :-)

Thanks for your help ill do a bit more digging and thinking and get back to you but only thing i use a dyno shop for is AF read outs as i do all work meself so could be a really good addtion to bike in long run

Cheers tezz

[cliffb75]

Oki my thinking is on my bike the 4 down pipes all go into a collector box / divider under my sump, only purpose is to separate 4 pipes into 2 which then output to a can on each side now in-between each can outlet there is a balance pipe that allows equal pressure to each zorst can this would be a great place for an wide band sensor as the balance pipe is removable and would b easy to weld on and wide band adaptor but my question do you need a certain amount of heat gas flow and do sensors have to be mounted at a certain angle to gas flow

Hi Tezz and welcome

Just wanted to pick up on your question above - the sensor does need to see gas flowing across it, so in the balance pipe won't work all that well. If you're keeping the twin system then just put it in one side - its fair to assume that the cylinder behave resonably similar to each other. Also Bosch recommend that you mount the sensor 'up', preferably vertical, so that water cannot collect in the nose, which will casuse the ceramic to crack when the heater is turned on.

Looking at the pic of your bike, I'd try and mount it just behind the heel plate near the footrest. There it'll see at least 2 cylinders and its also slightly concealed, and you can run the lead straight up a frame tube.

Good luck with it.

[xxdrac]

Thanks for that , i was trying to avoid drilling and welding my very expensive zorst but better that than it not working and yes i did consider that side as No 2 carb is the one that is used to set and balance all others

Just the issue on the button on the Vem gauge at moment is causing me to be a bit undecided as i read about it use a gap around this as an air vent even if i got caught out in rain and put in a sealed bag you would def get condensation inside bag and may get into gauge can seal around gauge and fit into a pod and wires using silocon to help but not yet overcome the air gap on button unless there a more basic gauge with out this a bit more thinking to do as buy time i add fitting and 2 fork clamps to make a figuer 8 bracket works out to about £220-£240

Have seen other handheld units on market and could just use a magnetic tank map bag as a holder and these have inbuilt data loggin but would really like a permant install next to my clocks

Thanks for all your help

LOL why do i start these things