Thruxton 1200 to Bonneville T120 ECU Swap and TuneECU - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 9 (permalink) Old 08-26-2019, 10:25 AM Thread Starter
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Thruxton 1200 to Bonneville T120 ECU Swap and TuneECU

I'll summarize the whole event but i just wanted to share an experience with the community. Because the engines between the Thruxton 1200 and the T120 are nearly identical, we installed a Thruxton 1200 ECU to a T120 just to see if it would work. Differences being the Thruxton has a lighter crank and 11:1 CR instead of T120s 10:1 CR.

It took us swapping out the ECU, instrument cluster, and ABS module before the ECU was happy. It was very hard to start and once it did start, it idled at 3000 rpm and ran poorly.

I was hoping to pick up 10-15 hp +/- from the more aggressive tune but it was a failure. This was attempted on a stock T120 with Vance and Hines slip-ons.

Other than the compression ratio and lighter crank, I'm not aware of any other mechanical changes between the Thruxton and T120 engine. The air box and exhaust are different, but I believe the bike would still start and at least idle some what decently. I must be missing some other difference.

All of this may be a moot point as TuneECU has listed the Bobber 1200 as a bike that can be remapped. Is the T120 in the works for mapping ability?
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post #2 of 9 (permalink) Old 09-06-2019, 05:06 PM
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Valves diagrams aren't differents ?
It would explain...
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post #3 of 9 (permalink) Old 09-07-2019, 01:45 AM
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The pistons, valves and cams have the same part numbers, I believe. Can you get more compression just from timing? It would be nice to drop a Thruxton R tune into a T120.
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post #4 of 9 (permalink) Old 09-09-2019, 02:37 PM Thread Starter
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Thruxton has a different part number cylinder head. Most likely where the added compression comes from.
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post #5 of 9 (permalink) Old 09-09-2019, 03:42 PM
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Quote:
Originally Posted by Lawton's_Cycle View Post
Thruxton has a different part number cylinder head. Most likely where the added compression comes from.
Yes, I remember someone talking about “shaving” the head.
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post #6 of 9 (permalink) Old 09-09-2019, 09:06 PM
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For all the trouble why not just flog the 120 and get the Speed Twin.
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post #7 of 9 (permalink) Old 09-11-2019, 09:28 AM Thread Starter
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Originally Posted by vitesse View Post
For all the trouble why not just flog the 120 and get the Speed Twin.
Good question. I very much like the riding position and styling of the Bonneville. I also have custom paint, Ohlins suspension, and some other accessories that wouldn't transfer over.
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post #8 of 9 (permalink) Old 09-18-2019, 04:37 AM
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Quote:
Originally Posted by Lawton's_Cycle View Post
Good question. I very much like the riding position and styling of the Bonneville. I also have custom paint, Ohlins suspension, and some other accessories that wouldn't transfer over.
Love the spirit of adventure - Could you achieve the desired result with a tec cam, x-pipe and PCV tune?
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post #9 of 9 (permalink) Old 09-19-2019, 09:47 AM Thread Starter
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It's funny you mention that! I am indeed working on those now. Those are my winter projects for this year. I also found a complete Thruxton 1200 exhaust system that I'm adapting to fit. I already have the header pipes installed as they install with zero modification. It's the intermediate pipes to the mufflers that will require some fabbing to connect to a set of Predator Pros. The stock T120 tubing is drastically smaller than the Thruxton.

I've found a local shop that has extensive experience with the power commander and is one of few shops I've found that actually makes ignition timing adjustments! I think there is a decent gain to be had, just by running premium and adjusting timing. Last on the list and probably most difficult is to fab a custom air box that will allow an open type air filter element (like a K&N pod filter/s), but not the tiny ones now available. The goal is to build something that will have at least the same surface area of the stock filter element. If you compare the Thruxton air box vs the T120 Air box, there are obvious differences in inlet size, so the T120 would probably benefit from something a bit more free flowing, especially with a TEC camshaft.
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