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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-08-2012, 10:26 AM   #1 (permalink)
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Remapping ECU Necessary?

EFI Bike. OK so have opened up the air box and fitted a K&N. Fitted Emgo Dunstall mufflers and removed the Air Injection. Bike is running better than new, more power, smoother at low speed and slightly better MPG. Checking the plugs they appear to be burning ever so slightly rich but well within bounds.

I can see that remapping will have additional power benefits but is it necessary?
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Old 12-08-2012, 10:49 AM   #2 (permalink)
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EFI Bike. OK so have opened up the air box and fitted a K&N. Fitted Emgo Dunstall mufflers and removed the Air Injection. Bike is running better than new, more power, smoother at low speed and slightly better MPG. Checking the plugs they appear to be burning ever so slightly rich but well within bounds.

I can see that remapping will have additional power benefits but is it necessary?
I would have thought that opening the airbox and fitting a free flow air filter, plus more open pipes would weaken the mixture rather than richening it, making remapping neccessary. Do you still have the O2 sensors in place? It could be that they are compensating for a weaker mixture but this would only happen at low throttle openings. If the O2 sensors have been removed then a remap is neccessary because the ECU would have to fall back on the map data in the absence of an O2 sensor signal. Another thing to consider is, was the bike remapped already when the Emgos were fitted.
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Old 12-09-2012, 02:27 PM   #3 (permalink)
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I would have thought that opening the airbox and fitting a free flow air filter, plus more open pipes would weaken the mixture rather than richening it, making remapping neccessary.
I would agree. Fuel mapping is lean to begin with. Adding more air into the motor and less restriction on the exhaust will make it more so.
Pat, how did you "open" the air box? Remove snorkel? Cut parts away? Or did you just replace the filter? TOR fuel map at the least would be called for with better air filter and exhaust. Custom tune if more air flow was added.
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Old 12-09-2012, 02:52 PM   #4 (permalink)
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Pat, I have somewhat the same set up as you.

Given that the stock mixture is quite lean to meet emission standards, and that you have removed the puffing air injection,
your ECU setup right now is good enough to just leave it alone.

BUT, you could go to your dealer and have him remap with the TORS factory ECU map as suggested above.

Personally, given your plug color comment and satisfaction with performance, I probably would consider it perfect and do nothing.
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Old 12-09-2012, 08:47 PM   #5 (permalink)
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No remapping to date. The snorkel is removed and the opening to the airbox opened out. Baffle still in place but that will come out soon. Air injection removed as per the post. O2 sensors still there as I cannot see a benefit of removing them. Now the dealer did say that the bike was set up for high altitude - 5,500ft North of Denver and I am in Cheyenne at 6,000ft. But I don't necessarily believe that as they told me a bunch of other incorrect stuff. The plugs are a mid grey colour which in the old carb days was good.

Last edited by wyomingpat; 12-09-2012 at 08:48 PM. Reason: update
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Old 12-10-2012, 08:17 AM   #6 (permalink)
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No remapping to date. The snorkel is removed and the opening to the airbox opened out. Baffle still in place but that will come out soon. Air injection removed as per the post. O2 sensors still there as I cannot see a benefit of removing them.
Your current configuration calls for the "TOR/aftermarket exhaust" fuel map at the least. If you remove the internal air box baffle even more air will flow. The stock map will be very very lean. I believe a custom tune or one from TTP/TPUSA would be called for. Those would also likely do away with the O2 sensors.
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Old 12-10-2012, 01:27 PM   #7 (permalink)
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...The plugs are a mid grey colour which in the old carb days was good.
I'm not sure how much experience you have reading spark plugs, so no offence intended, but there is a specific procedure and a number of variables to consider. Do a search for "plug chop" and take a look at what pops up. Also, as a more direct answer to your question, I would recommend a re-map. Most likely you are running lean.
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Old 12-11-2012, 10:40 AM   #8 (permalink)
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I can see that remapping will have additional power benefits but is it necessary?
I would say it's necessary and, given the minimal cost and effort in doing so, why wouldn't you?
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Old 12-12-2012, 01:07 AM   #9 (permalink)
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This gets asked so many times....anytime you do exhaust mods you need to remap. Throw in airbox mods and there is no question. You can't get more air in and out and not tell the compute to add fuel. Remap and get the full benifits of the mods or run very lean and very hot.
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Old 12-12-2012, 10:25 AM   #10 (permalink)
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I would say it's necessary and, given the minimal cost and effort in doing so, why wouldn't you?
It is a 220 mile round trip to Denver and it is December! Have wait to April.
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