955i, harsh pick-up from slow speed, map update? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 31 (permalink) Old 10-26-2018, 02:06 AM Thread Starter
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955i, harsh pick-up from slow speed, map update?

Hi All,

My bike has a harsh/jerky/on-off pick-up when opening the throttle from closed at low engine speed in low gears, this isn't a problem on main roads, but it is a liability on twisty backroads, particularly low speed 90' corners. Currently managed by slipping the clutch to keep the revs above idle and holding the throttle slightly open. The problem is magnified with hard luggage and a full tank, probably worse with a pillion.

Bike also occasionally lifts the front wheel in second gear, which is OK when expected but can be a surprise when overtaking.

The age of the fuelling/ignition map is unknown, I probably have a couple of options:

1) Triumph dealer, do they upload the latest map free of charge (UK)?

2) TuneECU as per this useful thread https://www.triumphrat.net/ecm-and-f...tallation.html 33 pages!

3) Use a more suitable bike on backroads.
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post #2 of 31 (permalink) Old 10-28-2018, 10:00 AM
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You may want to:
-check the tps using TuneECU, even zero out the tps using TuneECU as well.

-balance the throttle body,
-maybe reload the map. See maps on the TuneECU website.



Fred
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post #3 of 31 (permalink) Old 10-29-2018, 11:33 AM
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Does a dealer do anything free of charge?
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post #4 of 31 (permalink) Old 10-30-2018, 03:01 AM Thread Starter
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Quote:
Originally Posted by fredsprint View Post
You may want to:
-check the tps using TuneECU, even zero out the tps using TuneECU as well.

-balance the throttle body,
-maybe reload the map. See maps on the TuneECU website.



Fred
Thanks Fred, I'll have to motivate myself re: TuneECU, at least the only direct financial cost appears to be a cable. Are the maps free?

After reading through some useful threads, it appears that it's not possible to read the air flow through the individual throttle bodies on my 2003 bike using TuneECU, so it's tank removal time, something I've not been looking forward to.
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post #5 of 31 (permalink) Old 10-30-2018, 03:05 AM Thread Starter
Supersport 600
Main Motorcycle: 2003 Sprint ST
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Join Date: Jul 2016
Location: That London
Posts: 190
Other Motorcycle: 1972 Tiger 650
Extra Motorcycle: 1964 T100 scrambler
Quote:
Originally Posted by smorris View Post
Does a dealer do anything free of charge?
Good point. You'd think that if it's safety-related then the software update would be free. Away from bikes, the software for the various electrical control systems I have some involvement with is all updated free of charge; as is the software for my laptops/PC/mobile phone.
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post #6 of 31 (permalink) Old 10-30-2018, 06:08 AM
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Quote:
Originally Posted by Dibnah View Post
Are the maps free?
Official maps are available on the TuneECU site. Just look for the one that fits your bike.


http://www.tuneecu.com/Tune_List.html


Fred
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post #7 of 31 (permalink) Old 10-31-2018, 07:11 PM
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Before changing the map. A quick first thing you should try is to take the tank and air cleaner off to watch the action of the throttle cables. They may only need some slight tensioning or other adjustment. Mine was snatchy when I got it. A 1050. Same symptoms. I actually put the slightest bit of slack in my cables and lubricated things making sure the action was smooth and what I wanted each cable to do at the injectors as I twisted the grip. I have a tiny bit of movement before they actuate the butterfly valves. Before it was too tight I think. Essentially I made them slack and adjusted them carefully. Cleaned everything in the mechanism. Then I adjusted the chain which I had already done but to see if in the miles I used it if it changed much at all. A sloppy or worn chain can bring on this sort of symptom too. I felt mine may never have been carefully adjusted with when it left the dealer (could only know by riding it)and the owners couldn't or ham fistedly adjusted it only at the grip. Mine is smooth now. That feeling a distant memory. The wheel will still come up in second if I just open it up when I shift but that snap at low speed is gone so perhaps it doesn't lift so readily. It really did sort of jerk before. I worried it would cause the tire to slide at a bad part of the turn on a wet road or something sooner or later.
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Last edited by done; 10-31-2018 at 07:23 PM.
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post #8 of 31 (permalink) Old 10-31-2018, 07:22 PM
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My guess is that I think done done nailed it.
Mine doesn't behave anything like what you're describing.

The TuneECU bit fredsprint is describing would not hurt any, either.
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post #9 of 31 (permalink) Old 10-31-2018, 07:27 PM
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Tune Ecu or Dealer Tool are worth buying. If it has ABS you need Dealer tool. It is only good for your serial number so if you don't have abs it makes no difference since you can't use it to bleed brakes on other peoples' bikes. They are both good. While the tank is off check all the hoses to make sure they aren't dry rot cracked and leaking. You want to clear up the simple stuff it may be before changing the mixture. People naturally tend to suspect the worst but usually it's something simple. This just some sort of fine tuning adjustment.

Last edited by done; 11-02-2018 at 10:27 AM.
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post #10 of 31 (permalink) Old 10-31-2018, 07:31 PM
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I've used TuneECU to do the brakes on my GT and that has ABS for whatever that's worth.
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