TTS speed limiter issues
Thread Starter
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Tourer
Joined: Apr 2012
Posts: 250
Likes: 22
From: New Jersey
the injector seem to keeping up pretty good, not giving any indication of running out of fuel but I was always curious about the pressure on these things. Do you recommend any gauge kits?
Last edited by Junker; Jun 20, 2022 at 12:21 PM.
HD EFI Guru
Joined: Jan 2008
Posts: 4,494
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Yes, there are lots of things in the ECM that the tuner does not address, but if the injectors are firing properly (pulse width) and the timing (deg) is still OK, then there is nothing in the ECM limiting! I tried to explain this to you before as that is what is used to limit the power. So if they are fine your looking in the wrong place for answers.
Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
BTW TTS doesn't have big racer fixes, then pro fixes and then street guy fixes. They are all the same starting cals, with all the same tools and features. Do you really think TTS would give big race fixes to the Scream'n Eagle race teams that use TTS at the track?
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,939
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From: poway
https://www.zippersperformance.com/772-457/
There are plenty others out there. You want on that will connect inline so you can test. Pick one you like..
If doing non dyno run, I'm not sure that the injector timing would not be any different than say on the dyno where the run is really short. So not sure you'd see anything. I would assume no fuel trims at those throttle settings.
Sampled run injector timing at speed would be close to the dyno run.. I might guess that you could possibly have detonation that would pull back timing but that should show up on the run..
What is MAP at that speed? Maybe something with turbulence around the air cleaner?
Thread Starter
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Tourer
Joined: Apr 2012
Posts: 250
Likes: 22
From: New Jersey
Yes, there are lots of things in the ECM that the tuner does not address, but if the injectors are firing properly (pulse width) and the timing (deg) is still OK, then there is nothing in the ECM limiting! I tried to explain this to you before as that is what is used to limit the power. So if they are fine your looking in the wrong place for answers.
Last edited by Junker; Jun 20, 2022 at 04:27 PM.
Thread Starter
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Tourer
Joined: Apr 2012
Posts: 250
Likes: 22
From: New Jersey
Maybe, maybe not. There are some factors involved, and this includes DJ's numbers.. Rev limit is what is set in the ECM. TTS is pretty straight forward with this setting. The other limiter is speed. You can either lie to your ECM with speedo calibration or unplug the speed sensor for testing purposes. If the ECM doesn't know speed. It can't limit it. Once you have figured out it isn't the ECM limiting you. Then I would look into the advice given above.
BTW TTS doesn't have big racer fixes, then pro fixes and then street guy fixes. They are all the same starting cals, with all the same tools and features. Do you really think TTS would give big race fixes to the Scream'n Eagle race teams that use TTS at the track?
BTW TTS doesn't have big racer fixes, then pro fixes and then street guy fixes. They are all the same starting cals, with all the same tools and features. Do you really think TTS would give big race fixes to the Scream'n Eagle race teams that use TTS at the track?
HD EFI Guru
Joined: Jan 2008
Posts: 4,494
Likes: 4,780
And if you would have looked at the logs that I sent you, you would have seen that it is pulling way more timing than any map in the tune is showing. And I asked why is it pulling so much? But again you gave no responses to my e mails. I thought asking you directly and giving you all the information that I had was looking in the right place for answers.
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Joe Kucinski
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From: poway
The only physical difference from the dyno to road is the front tire turns on the road.
1. The time to get to 131 mph on a dyno is a lot faster than on the road. This extra time means more load on the motor. more heat generated.
2. You'll be using more fuel to do so.
3. Beside the usual drag there is more wind turbulence. There can be some unknown issue that crops up as a result..
I have to admit that it's interesting that in both 5th and 6th the bike stopped at 131 mph. It might be a wind turbulence thing. I mention the AC but it could easily something else.
HD EFI Guru
Joined: Jan 2008
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I just got off the phone with the tuner who tuned the bike and first presented the issue to me. He recalled the same thing I did and that was when the data was compared of the good runs on the dyno, and the ones that fell off, the timing, TPS and the fuel (BPW) remained the same! So while there is something going on with this bike there is more that's not known then it being a TTS Speed Limiter issue.