|
Most of them are between -5 & 20 standard.
|
Hi Kev,
Your advice has been much appreciated since I bought an 05 xtx a few months back, I did the "Kev" mod & altered the CO value & tried changing the TPS value but my bike still banged & popped on a closed throttle from any rpm & the surging improved slightly but remained. To learn more I installed a O2 sensor port in the header and fitted my A/F ratio meter and went for some rides. I worked through each mod in sequence and monitored the result. Each mod produced a slight change in exhaust O2 readings around idle and slightly above but none of the changes affected the indicated fuel mixture at cruise or full throttle ! I tried going both ways on the CO value to the point of stalling on a low setting but still no change on rpm above fast idle. This data corespondes to the "feel" of the bike as I could only detect changes around idle performance and no change in general engine behaviour. My bike has hi flow air filter, Yamaha racing pipes and I cut the "crimped" end off each header (4mm) as the flowbench showed significant restriction from that, it was also causing a lot of flow through the ballance pipe which as the headers are paired obviously could not go anywhere. As many other riders have found improvements from the mods across the entire rev range I am curious why my bike hasn't responded the same but the test rig I used has proven accurate on other bikes / cars. I'll keep at it until I find some explanation. Nick, Auck, New Zealand |
Hi Nick, welcome to the XT forum, I will try to answer your questions as you have many.
Hi Kev, Your advice has been much appreciated since I bought an 05 xtx a few months back, I did the "Kev" mod & altered the CO value & tried changing the TPS value but my bike still banged & popped on a closed throttle ( You need to block off the AIS pipe to stop the popping, the popping is mostly caused by air injected into the exhaust port for emission control) from any rpm & the surging improved slightly but remained. What are the last 2 numbers on your engine ECU 00 or 01? To learn more I installed a O2 sensor port in the header and fitted my A/F ratio meter and went for some rides. Not sure what type of A/F meter you are using is it a wideband sensor, what data logging rate does it use? Y ou need to block off the AIS pipe before you can get any accurate A/F reading. As the AIS valve can open at any time & throw out the readings. I worked through each mod in sequence and monitored the result. Each mod produced a slight change in exhaust O2 readings around idle and slightly above but none of the changes affected the indicated fuel mixture at cruise or full throttle ! I use Tunelink software on the dyno & now have a WB2 commander that data logs throttle position as well as A/F ratio from 10 to 18:1 using a wideband O2 sensor for quick on the road testing. I tried going both ways on the CO value to the point of stalling on a low setting but still no change on rpm above fast idle. You are corr ect, once the TPS reads over 18 on the dash it will run on the fuel map. The fuel map can then only be adjusted by the sensor inputs, coolant, air, air pressure, throttle position & rpm signals within a small parameter. This data corresponds to the "feel" of the bike as I could only detect changes around idle performance and no change in general engine behaviour. My bike has hi flow air filter, Yamaha racing pipes I would recommend you to run a Power commander with those mods to gain full control over the fuelling, also add a stage 2 DNA filter for more gains. and I cut the "crimped" end off each header (4mm) as the flowbench showed significant restriction from that, Thanks for the info I do not know that it was also causing a lot of flow through the ballance pipe which as the headers are paired obviously could not go anywhere. The H section is there to improve bottom end torque. As many other riders have found improvements from the mods across the entire rev range I am curious why my bike hasn't responded the same but the test rig I used has proven accurate on other bikes / cars. Try disconnecting the AIS by blocking the pipe off so you are get a true A/F reading all the time. If you unplug the AIS at the connector the valve will remain open showing a constant lean mixture on the CO tester. I'll keep at it until I find some explanation. The best fuelling mod by far is a power commander which will allow you to adjust the fuelling through out the rpm range +-. Nick, Auck, New Zealand |
Quote:
That done, the readings I got were a similar trend to before except slightly richer and less changable, mainly around a closed or part closed throttle. To answer your quetions: my ECU number ends in 01, the O2 sensor I use is a narrow band(0-1v), the logging/response rate of my A/F display is 220ms on bar graph & 440ms on digital display. The popping in the exhaust has slightly improved and the A/F values I get are around 14.3 - 14.5 @ cruise throttle, and a steady 14.5 @ full throttle, I'm guessing although these numbers may be safe they are probably a little lean for best power. I re-read your post on HP gains from different mods & attacked my airbox, I'd have liked to put it on the flow bench but did'nt fancy dissmantling half the bike to get it out ! I've drilled x5 holes in the places you show with a couple of changes, I centered as many holes as I could in the middle of the moulded reinforcing so was able to use 38 dia on several (for better or worse) & the two holes on the left side looked like they were being "shadowed" by the regulator so I spaced it out with a couple of 12mm urethane spacers. Judging by the induction racket emanating from under the seat I'd say I've opened things up a bit ! Just to summerise: by trying different settings on the "Kev" mod, the CO value & the TPS, I can make subtle changes to the behaviour of the engine but not enough it appears to counter the changes I've made so your comment about fitting a PC111 to fully optimise these alterations seems on the money. The main problem I have is the bad throttle response, when on & off the gas an & up and down the gears the throttle response is terrible (compared to my other bikes). A question if I may, what I/O do the PC111 units modify on the XT, do they use just TPS or several ? Thanks & Regards,Nick |
Quote:
The 01 ECU is the best one in my eyes & had the best results for surging. I have run them all on my bikes 04/07 models, 00, 01, a remapped 00 by Yamaha & a 10 ECU & the 01 is the best. 14:1 is way to lean if you want the HP, get a PCIII on that bike. These bikes like between 12.8 low down to mid range to 13.2 at higher revs to produce the best HP & torque. Also get a DNA stage2 on your bike as this filter offers the best HP gain for money. The PCIII for the XT uses the TPS as an input & intercepts the signal to the injector with an input to the PCIII & an output back to the injector, then a earth point to the battery. There are two PCIII's around for the XT make sure you get the one that plugs onto the TPS with a connector & not spliced into the wiring. The PCIII is able to adjust the fuelling in over 300 postions using throttle postion against RPM range. One other thing that I have found out only this week is that once I changed my 07 ECU back to a 05 ECU my popping came back on over run with the AIS blocked off. After a few hours of playing around I have put it down to the twin spark on the 04 to 06 ECU's, as I can't get rid of it by changing the PCIII fuel map. The 07/08 ECU's went to single spark with the O2 sensor, with the single spark 07 ECU blocking the AIS stopped the popping back by 99% & it now pops most of the time around the 2750 to 3200 rpm range, we learn something every day. I will amend the AIS mod notes. |
advice on surging
still new to xtx but can see what you mean about surging. been in the techno section and read about the fueling fix (co mode) will this fix the surging or help it and if so should i wait until my 600 mile service is done which is only 4 weeks away???
|
First of all what year XT do you have? If it was me I would adjust it now.
|
Quote:
its a 2009 model 150 miles what do you think:-) |
Quote:
I would recommend you adjust the CO1 up by +10 & go for a ride at small throttle openings, then adjust the CO1 the other way by -20 so you are now 10 below your standard setting. Come back to us on which setting was the best. |
Hi,
I am new Yamaha 08. Tenere owner and this is my first contact with Yamaha. I ride cross ktm, I had Vstrom before this bike and of course this bike is without power after 1000cc bikes. But I read all this modification and I today put two new open pipes. From first day ( with original cans) it popped a lot when I turn off throtle, on low rpm. Why? Is it bad air/fuel mix? I think It is because it is rich mix, and all I read here with CO1 corection, we make richer mix?! So what I have to do ? To make air box modification, put K&N filters? What CO corection to make? I read about popping that it is not blocked AIS pipe?! What is AIS pipe? Do I need to move to corect value TPS sensore and what is good TPS number? Thanks a lot, I hope that I would like this bike. Thanks a lot. |
| All times are GMT +1. The time now is 21:37. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.