2021 V85TT decat question

[Sye]

Arrow now sell a decat header set and silencer for the 2021 Euro5. I am thinking of trying them out but...

If I do it may run very lean? The lambda sensors should correct the open loop at the upper rev range but the closed loop will run lean. I'm hesitant because nobody has yet worked out how to access or modify the map, so that's not an option.

I can opt for the official Guzzi Arrow homologated silencer on its own and forget the link pipe for now and that should make it sound sweeter.

Thoughts, suggestions or should I forget about it until the map can be modified?

[Caffeineo]

You could try this out and give a report on how it works....   
https://www.guareschimoto.it/prodotto/gcorse-by-upmap-kit-t800-v85tt-e4-e5/

[Huzo]

Arrow now sell a decat header set and silencer for the 2021 Euro5. I am thinking of trying them out but...

If I do it may run very lean? The lambda sensors should correct the open loop at the upper rev range but the closed loop will run lean. I'm hesitant because nobody has yet worked out how to access or modify the map, so that's not an option.

I can opt for the official Guzzi Arrow homologated silencer on its own and forget the link pipe for now and that should make it sound sweeter.

Thoughts, suggestions or should I forget about it until the map can be modified?

My V85 map has been re worked.
The lambdas have been disconnected.

[Kiwi_Roy]

Go right ahead, its your bike, but don't come crying if it doesn't work.

[Sye]

My V85 map has been re worked.
The lambdas have been disconnected.

The 2021 Euro 5 has a different Ecu that so far no one has been able to get inside. It is claimed that the map cannot be modified, although there are people trying hard to prove them wrong.

Logic tells me that the ECU will compensate for a lean mixture in open loop. Closed loop may be a problem though?

[Huzo]

The 2021 Euro 5 has a different Ecu that so far no one has been able to get inside. It is claimed that the map cannot be modified, although there are people trying hard to prove them wrong.

Logic tells me that the ECU will compensate for a lean mixture in open loop. Closed loop may be a problem though?

Oh, ok Sye.

[Sye]

Go right ahead, its your bike, but don't come crying if it doesn't work.

Happy to buy the Arrow silencer which is a official Guzzi accessory. Not so much the link pipe ATM.

[blu guzz]

consider your warranty as well.  it might cause you problems.  i  did not de-cat until i was out of warranty.

[HarveyMushman]

The 2021 Euro 5 has a different Ecu that so far no one has been able to get inside. It is claimed that the map cannot be modified, although there are people trying hard to prove them wrong.

Logic tells me that the ECU will compensate for a lean mixture in open loop. Closed loop may be a problem though?

If you turn off the lambdas how will the ECU know to compensate?  In open loop the ECU is not receiving input from the lambdas and is relying entirely on the base map.  Only in closed loop, with feedback from the lambdas, can the ECU apply any compensating adjustments.   

[audiowize]

It's important to remember that running in open loop, the ECU still uses all the sensors other than what's in the exhaust track.  Some bikes (like many of the Kawasaki Concours 1400s) don't even have closed loop operation at all!

[Vagrant]

Most silenceling on new bikes is done with that big colostomy bag under the bike. Remove the muffler and run the bike and you will get an idea of how little a noise increase a new muffler only will give.

[Sye]

If you turn off the lambdas how will the ECU know to compensate?  In open loop the ECU is not receiving input from the lambdas and is relying entirely on the base map.  Only in closed loop, with feedback from the lambdas, can the ECU apply any compensating adjustments.   

I don't plan on having the lambda sensors turned off for that very reason.

[HarveyMushman]

It's important to remember that running in open loop, the ECU still uses all the sensors other than what's in the exhaust track.  Some bikes (like many of the Kawasaki Concours 1400s) don't even have closed loop operation at all!

Yep, I was off-base. 

[pauldaytona]

Lambda sensors work only until 5000rpm. After that it's open loop. So don't trust them to compensate for a much more open circuit.

[Sye]

Have decided to forget replacing the collector until someone comes up with a way of updating the map.

Have fitted the Genuine Arrow slip-on accessory that sounds lovely, won't invalidate the warranty and won't affect fueling. I'm impressed with the quality and finish of the silencer, it's right up there with Akrapovic for quality. Titanium sleeve, stainless steel link pipe and internals. Should last a while and looks great IMHO.

[dave1068]

I have a 2020 model, what expected gains are you getting with this mod?

[Sye]

I have a 2020 model, what expected gains are you getting with this mod?

None, just sounds and looks better. Modest power gains can be made from a decat and map but I'm unable to do that.

Huzo on this forum has done the mod on his and would be better able to tell you what difference a decat and map makes. 👍