2023 T120 Euro5 Exhaust Question

[brooke]

My friend's 2015 (T100 -- similar) had to re-map his system when he changed his exhaust. He took it to a local business who put his bike on their dyno machine to re-map. The bike came back with (in his opinion) more power than it had previously, and no longer had any variances in the throttle. He was pleased!

I expect you may need the same when changing out your exhaust (DYI or professional).

The ECU can adjust enough to provide the original factory fuel ratios after the decat is installed . That’s what the ECU does , it puts in more or less fuel depending on the variable conditions it has to live with such as air temperature / density , engine temperature , and a host of other stuff one of those being a decat . However stock , these bikes run fuel ratios leaner than would have been thought possible not that long ago . This is required because of emission laws and has the side benefit of excellent fuel mileage . If these bikes run richer fuel mixtures ( more gas , less air ) they will make more power and probably run a bit nicer . Lean engines love more fuel to a point . Lots of people install booster plugs which trick the air temp sensor into sending a cooler air signal to the ECU and talking it into squirting in some extra juice because it’s cold outside when it’s not . They are a poor man’s remap and people love them . I don’t have one , the lean engine is fine for me and I can’t afford to pay for the lower fuel mileage .

 

[atomsplitter]

If you change silencer's then a remap is likely necessary. Putting a decat pipe in alone is not the same thing. Back pressure is produced by both the silencers and the cat with the vast majority of the back pressure coming from the silencer's (knocking the noise off) labyrinth. The small contribution from the cat isn't enough to require a remap but add the noise back in and a remap is required cat or not. That said TuneECU has maps available for most applications and dyno tuning isn't required, but if you want the maximum available power a dyno tune works a treat. I have a T-120, a TTR and a Bobber and have a Booster plug in both the Bobber and the T-120 (not the TTR). It's a way of dealing with the low end throttle glitchyness that comes from the too lean fueling and really has no effect on the upper end of the throttle. The fueling issues on my TTR are handled by the 'SPORT' mode selection that fattens the fuel curves without having to fool them into thinking the air is colder than it is.

 

[Dave K]

The ECU can adjust enough to provide the original factory fuel ratios after the decat is installed . That’s what the ECU does , it puts in more or less fuel depending on the variable conditions it has to live with such as air temperature / density , engine temperature , and a host of other stuff one of those being a decat . However stock , these bikes run fuel ratios leaner than would have been thought possible not that long ago . This is required because of emission laws and has the side benefit of excellent fuel mileage . If these bikes run richer fuel mixtures ( more gas , less air ) they will make more power and probably run a bit nicer . Lean engines love more fuel to a point . Lots of people install booster plugs which trick the air temp sensor into sending a cooler air signal to the ECU and talking it into squirting in some extra juice because it’s cold outside when it’s not . They are a poor man’s remap and people love them . I don’t have one , the lean engine is fine for me and I can’t afford to pay for the lower fuel mileage .

I forgot that the 2015 was the last year of the air cooled versions.

 

[sikatri]

Let’s keep on topic please. I believe we all have the right intent, to help each other. I’m sure we’d all gladly sit with each other over a beer or beverage of choice. I’ll toast y’all tonight, so cheers and peace.

 

[Qship]

Let’s keep on topic please. I believe we all have the right intent, to help each other. I’m sure we’d all gladly sit with each other over a beer or beverage of choice. I’ll toast y’all tonight, so cheers and peace.

Fixed it. Hopefully appeases both parties.

 

[proturn1]

Can't speak to the Euro 5 issue, but any exhaust change will require a remap of the ECU. The over lean factory fueling to meet emission standards only gets worse with less back pressure.

Hi
Will leaving the Cat in Place and just changing out the Std Heavy Silencers require a re map?
Or will the ECU Unit not re set the mixture from the feedback data to accomodate them?

 

[proturn1]

Agree, I would visually inspect your bike. I was hoping mine was clamped, but a look at the connections showed they were welded. My understanding is the same -- newer Triumphs are welded rather than clamped to meet the Euro5 standard.

If yours is welded, it means a different approach and more money.

Hi Guys
I have a 2023 Speed Twin and that has the 4 clamps to the Cat in and out ports

 

[proturn1]

I’ve checked the bike and had the drawings sent through. It is in fact welded so the h bomb pipes won’t work. Looks like I need ti find a set of slip ons or exhaust tips if I’m to change the current stock set up.

Hi
I have the 2017 1200 Thruxton and a 2023 Speed Twin 1200 both have the clamps on the exhaust Cat in and out.

 

[atomsplitter]

Hi
Will leaving the Cat in Place and just changing out the Std Heavy Silencers require a re map?
Or will the ECU Unit not re set the mixture from the feedback data to accomodate them?

If the new silencers have similar flow characteristics of the OEM units a remap may not be required, a simple 12 minute tune should do the trick. That said if you get a lot of decel pop and it feels like it won't accelerate like before the exhaust change a remap is the only cure.

 

[nickjaxe]

When I was buying my 2020 T100 new....I asked my dealer will de-catting effect my warranty and will the ECU need adjusting by you......NO WAS THE ANSWER TO BOTH.