Bike running lkr crap
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Road Warrior
Joined: Apr 2007
Posts: 1,641
Likes: 156
From: florida
Bike running lkr crap
After Installing the TTS and loading the base map for my bike it ran great. After 4 v tunes and downloading the final map the bike began surging at low speed and rpm. So today I thougt I'd try another v tune at slow speeds but the bike felt like it was running out of gas. Filled it up but no change. Runs good and pulls good at higher rpms and speed. I finally re-loaded the factory map but no change. Changed the plugs, checked the fuel pressure and checked for intake and exhaust leaks. One other observation- During my last v-tune I was not getting any hits at 2% tps . Also the ve's for the rear cylinder in some areas were 30 points higher than the front cylinder. Any help would be appreciated.
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,419
Likes: 1
From: Ashland Ore.
I sorta understand why people try and do their own tune with this tuner,but the fact is you'll never optimize the tune unless you take it to a dyno. That's my suggestion for you. Take it and have a dyno guy do it once and do it right. Save yourself the frustration.
Last edited by thedonthere; Jun 5, 2010 at 03:11 PM.
Elite HDF Member
Joined: Apr 2007
Posts: 4,919
Likes: 23
From: Seattle, WA
There's a way to calibrate the O2 sensors (at least with the T-Max would think the TTS might have a method to calibrate, too) if that is a potential problem ... that would seem like a good idea to check ... especially since the rear cyl is so far off the front cyl ....
R/
'Chop
R/
'Chop
Thread Starter
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Road Warrior
Joined: Apr 2007
Posts: 1,641
Likes: 156
From: florida
Yeah, I was thinking a bad sensor too but the bike hasn't thrown any codes. I thought if a sensor fails you would get a engine light and a code. I know its not the TTS because I pulled that map and reloaded the stock map.
Club Member
Joined: Feb 2008
Posts: 11,483
Likes: 39
From: Passaic County, NJ
did you buy the tts new? if so, doesn't it come preloaded with a base map for your config?
If you got it used...I think you can clear it, resend base map and start over.
Surfor..didn't you have starting problems with a used tmax or tts and that's how you resolved it?
If you got it used...I think you can clear it, resend base map and start over.
Surfor..didn't you have starting problems with a used tmax or tts and that's how you resolved it?
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Road Warrior
Joined: Apr 2007
Posts: 1,641
Likes: 156
From: florida
Yes I bought it new. The TTs is not the issue. Bike ran fine when I first mapped it with the TTS. Problem started after that. I pulled the TTS and reloaded the stock map to verify that.
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Elite HDF Member
Joined: Apr 2007
Posts: 4,919
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From: Seattle, WA
O2 sensor may not 'throw a code' ... if the sensor is fouled it might not be getting a good reading and that would explain the significant discrepancy between the cylinders ....
As I recall the process, basically, you take a reading of atmospheric O2 which I think is around 19% ... if it is reading something other than that it might need to be cleaned or the system adjusted to show actual atmospheric conditions ....
T-Max documentation says to check (i) Data port is plugged in (ii) damaged wiring on the closed loop module (iii) damaged wiring or connector on the O2 sensor (iv) an O2 sensor is unplugged (v) O2 sensor is damaged or dirty ... to test the O2 sensors are active and properly working, turn the ignition on (do not start the engine). "Link to the module and monitor AFR values for front and rear cylinders without starting the engine ... after approx 10 seconds, the sensors should be calibrated. Once calibrated to the ambient air, the O2 sensors should warm up to a value of 19.36 for each sensor in the monitor window .... If you cannot replicate the value of 19.36, your O2 sensors are not calibrating correctly. This will cause corrupt data to influence thee effectiveness of the ThunderMax Auto-Tune module in properly following the targets on the tuning pages."
I'd recommend reading your TTS documentation on how to test the calibration of your O2 sensors and give it a shot ....
R/
'Chop
As I recall the process, basically, you take a reading of atmospheric O2 which I think is around 19% ... if it is reading something other than that it might need to be cleaned or the system adjusted to show actual atmospheric conditions ....
T-Max documentation says to check (i) Data port is plugged in (ii) damaged wiring on the closed loop module (iii) damaged wiring or connector on the O2 sensor (iv) an O2 sensor is unplugged (v) O2 sensor is damaged or dirty ... to test the O2 sensors are active and properly working, turn the ignition on (do not start the engine). "Link to the module and monitor AFR values for front and rear cylinders without starting the engine ... after approx 10 seconds, the sensors should be calibrated. Once calibrated to the ambient air, the O2 sensors should warm up to a value of 19.36 for each sensor in the monitor window .... If you cannot replicate the value of 19.36, your O2 sensors are not calibrating correctly. This will cause corrupt data to influence thee effectiveness of the ThunderMax Auto-Tune module in properly following the targets on the tuning pages."
I'd recommend reading your TTS documentation on how to test the calibration of your O2 sensors and give it a shot ....
R/
'Chop
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Thread Starter
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Road Warrior
Joined: Apr 2007
Posts: 1,641
Likes: 156
From: florida
Well turns out it was a O2 sensor. Swapped them out and now the bike runs great with just the TTS base map. Will re-do the vtunes this week to get the bike dialed in. Can't thank Steve Cole enough for helping me with using the TTS to help narrow down the problem. Thanks to you guys as well!
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