100% duty cycle

So we finally got to take a look at this bike and was surprised as to what we found. The stock bike will get up to 100% duty cycle by 7000rpm and be in the 90s from 5000rpm. This is not good for the life of the injector by any means. The testing we did was at 500ft elevation and it was cold so this will be reduced with different weather and altitude but still, most bike will max around 80% duty cycle in stock trim.

Because of this we are probably not going to develop a PCV for it. If the duty cycle gets to 100% we can not make it any leaner ( and yes, this bike is too rich in stock form at 100% throttle). If you could up the fuel pressure or replace the injector this would no longer be a concern.

Anybody heard of any other mutterings of this?

Makes sense. Im disappointed as I wanted get a pipe and power commander for the terra.
Husky took the Rotax engine and most likely the same fuel injection system from the BWW, when they upped the crank HP from 50 to 58 , the stock injectors and pump are running 100% to keep up.
I vote for a bigger injector.
I won't have my bike until march. Can any terra owner read the model number off their injector so we can source a bigger unit?


Cheers

Actually Husky is using a Magnetti Marelli ECU and the BMW uses a Bosch. The numbering on the injector does not tell you anything unless someone has tested that injector before. Unfortunately we don't have a way to size it so I am not sure what you would need. Sorry.

On another note we did decide to make this unit. We will just add a note in the install that this problem could come up.

Loud pipes saves lives!!!



cheers

+1. This bike stomps everything in it's class....everything...by far....stock. Please correct me if I am wrong, but I don't think I am unless I am unaware of a European model. As a previous owner of a GS650 I know how much more power this bike has. I could always pull away from my KLR and DR buddies on the GS. I can't wait to ride with them now! I also think the bike has just the right exhaust note...I love the sound of it and the pipes look good too.

Yup....what he said. Spot on, Fab1up! The Terra is such a blast in its stock form, its damn near perfect for general duty fun.

But I do love that Dynojet PCV + AT. It was a great asset to my WRR! Loved being able to micro-tune it myself. But it needed help. The Terra...aahh...not so much. Though, I am known to be a tweaker & tinkerer. Hhhhmmm.....

HF

I wanted to lose the second exhaust so I can install a tool tube in its location. I have had a staintuned and FMF Q4 exhaust on my last two bikes. They tested 91db in sound checks at rallies. That number is social respectable, fun and safe enough to ride in traffic.
I will buy a PC when it comes to market and the pipe after.
Cheers

By the way, my Terra feels like its just loafing along at 70 mph with just 4,400 RPM. Cruised a turnpike at 80 mpg yesterday and that held steady at 4,800 RPM. So, maybe a 90% duty cycle in the injector above 5,000 RPM is not so much an issue. Most cruising will probably be around 4,000 or so.

HF

I'm confused, did you mean to say "if the duty cycle gets to 100% we can not make it any richer"? "and yes, this bike is too lean in stock form at 100% throttle"?

By chance did you check the fuel pressure?

Dyno numbers?


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Any updates?



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With a piggyback system if the duty cycle reaches 100% you can not make it any richer or any leaner. We need to see an edge to turn on and since the injector is full tilt there is no edge to trigger off of. We did not check fuel pressure.

I have a test unit on my desk. If there is anyone is the Las Vegas area that has a TR650 and wants a free Power commander bring it in and we'll get it taken care of.

Already in the works

Posted as a Technical contact to Magneti Marelli at their corporate website:

"Fuel Injector. You supply the fuel injector used in the new Husavarna TR650 motorcycle. Recent testing by Dynojet Research in Las Vegas, Neveda, USA, reports that the duty cycle of the injector is 100% at an engine speed of 7000rpm, and over 90% by 5000rpm. There is the strong suggestion that this condition will lead to problems with the injectors. Can you comment for the hundreds of readers at www.CafeHusky.com? We'll be awaiting your thoughtful response. Thank you in advance."

Probably a long-shot...

Worth sending to HV USA also?

Pretty hard to believe this is really the case but DJ undoubtedly know what they're seeing.

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Any further development progress on the PCV for TR650?

HF

R&D is completed and it has been finalized and released for production. DJ is now just waiting to build and stock a batch to start shipping. I just hit them up about when they will be ready to ship and should know shortly. As soon as I find out, I will let you know.

Kev.

They said about 6 - 8 weeks until they are available! Now to see what vendors have the best prices for PCV's!