****! I just went and looked up how much an exhaust gas analyser costs and it might be above my pay level. I might ask the wife is she can get me one for Christmas...what's the worst she can say?!
Personally I would use an NGK AFX meter. Then it can be mounted on your dash and permanently used on the road/track under real load.
When I had a supercharger on my Ford Transit truck I used a commodore exhaust gas oxygen sensor (four wire type) hooked up to a A/F ratio gauge that I bought from an instrument place. It was a series of green/yellow/red led bulbs that changed colour depending on the voltage coming from the oxygen sensor. Would not give a number, but I leaned to tell when it was running lean and could do something about it. Whole lot was about $150. Maybe a similar set up would be helpful for the bikes.
The NGK version has been updated and the price has gone up. http://www.amazon.com/NGK-96604-Fuel-Ratio-Monitor/dp/B00M9LTZVS The previous model was a tad over $200 I can't see the value in it unless you have done a lot of mods (like Murdo's supercharged engine). I am making my own exhaust system and binning the Exup, so I am expecting lots of jetting issues and there are no dyno facilities here, so basically a necessity for me.
Hi guys..not had any experience of the NGK one but looks like a good bit of kit..a lot better than some I've used over the years and paid more for lol..i might ask my own misses for a prezzy or two this christmas!! I shall start research now if its got datalogging 'under load' then i'm onboard..that's not far off having your own dyno!!! A few mates have these and think there good..Gunson G4125..bit primative and basic as there 'co' only....accuracy's not fantastic but its accurate to within half to one percent..not bad considering they retail here at about £100 new..not sure what that is in aus..but it should see the a/f ratio set pretty much bang on at whatever revs (jetting range or pilot circuit)..personally I use a crypton tuner (crypton 440 'cruise mate') hooked up to each exhaust downpipe so you can monitor and adjust each carb individually..the Suzuki's (GJ73a) i'm more often than not working on have the ports already designed into the standard downpipes for exactly this purpose ..its likely that all the 250 four cylinder bikes have them as without they cant be 'tuned' properly cylinder by cylinder and carb by carb..you guys will know more than me!!! My fireblade 919 with pretty much a straight through exhaust came without when I got it..so I drilled 4 holes in the downpipes, 'tapped' them and cut down four bolts to suit..instant success to the fueling issues it had!! Frankster, it needent cost a fortune m8, the crypton set me back £40 from a garage going into receivership..got it calibrated (gut wrenching £100 on top) and its pretty much bang on..so hunt around and it'll be the best investment you ever make!!!! Measures co,hc,co2, noX and o2, cylinder by cylinder set up at idle,1/4 half 3/4 and full throttle..then balance the carbs after completion and its pretty much job done..it comes into its own when experimenting with hotter/colder plugs, airbox alterations, porting, basically any modifications and helps pinpoint ring/sealing issues, vacuum problems and the like..with a bit of use it'll also help if you decide to start tampering with timing and 'slotting' the cams in search of 'a bit more' lol..every little helps ..think boydie on here will second me with your gsxr..its a different bike when set up properly..that'll go for pretty much all of the 250 4cyl's as there quite highly tuned as standard, you might get 5bhp from an exhaust/filter/jetting changes but you'll probably get 10bhp more just by setting up what you've got properly boss
Do you have the tuning manual for this device? I am thinking of buying one as I need to tune my drag bike. Not sure if this is the best way to tune it as being a 4-cylinder I assume any reading I get from the pipe will be combined between all four cylinders. How do you tune a 4-cyl bike with an O2 sensor?
The manual is available online and from memory your sensor will be in the header so you can tune each if you so desire. It is a stoichiometric sensor not O2 or is that a separate topic? cheers Blair
Thanks Blair. I tried to find it online, but alas came up short. I thought the O2 sensor gave you the 14.7 to 1 ( stoichiometric) reading. I'm learning as I go, but I thought it was 14.7 parts of oxygen to 1 part of fuel? I'll watch some youtube vids and go from there. I'm keen to get one of these to make sure I have the bike running at it's peak (not too rich or lean). Cheers Frank
Be useful to have one when I make the R4-SC (supercharged R4) running on E85 with 8:1 compression and 1bar of boost. Oh well it is good to dream.
Found the manual. Didn't look hard enough...there's a GEN2 version of this thing now and the manual is easy to find. Cheers
Good tools and equipment are never cheap. They changed the model and the price went up and it might come with a mile of cable that is set up for a car. I might get one of these myself since I have dumped the exup and will probably change my airbox. Once you get it sorted can you post the details please @Frankster
Will do. But, don't hold your breathe. Blair (and anyone else), out of curiosity, what do you think about these units? Waste of time; overkill; great?