can we talk about the "power up" options for the FI huskys? (510, 450, etc)

[patra_is_here]

I'm new to huskys and plan on purchasing a sm510r very soon. around the internet and such I see mention of 'power up' for these bikes.

does anyone have any dyno numbers or graphs on such things.

I saw one thread in which the O2 sensor was removed, which, honestly doesn't make a bit of sense to me. peak power is going to be made just north or just south of an 02 sensors optimal median reading (either peak lean power or peak rich power). meaning, on a FI vehicle the computer is going to look for that ideal power producing mixture, and the only way it's going to do that is to look at the data from the oxygen sensor.

 

[HuskyDude]

With the "Power up" installed and the O2 sensor removed a plug is inserted in place of and changes you ECU to race mode.

 

[jlk_250]

'08 model year was the first for FI on the 250/450/510 models. They came with narrow band O2 sensors (like most cars have) and heavy steel exhaust cans with catalytic converters inside. In theory an O2 sensor could help but in practice the Husqvarna implementation didn't work. The O2 sensor drove the mixture too lean (they are set lean for lowest emissions) and made them buck and stall. For racing/off-road use, they offered an optional kit (power up kit) that included an aluminum Arrow non-cat cannister and plugs to disable the O2 sensor. Most '08s run far better that way.

For '09 onward, the bikes included restrictive air filter cages to lower sound levels as well as O2 sensors. But the performance parts (less restrictive air filter cage and O2 delete plugs) come with the bike now so there is no kit to buy. Also, on the TE models the catalytic converter element is removable. People still call these parts the "power up" parts even though there is no longer a kit to buy.

You can get an aftermarket wide band O2 sensor that can adjust the fuel delivery for either max power or max economy. Read up on the Dynojet PCV and autotune module. It's cool stuff and works more like you're thinking an O2 sensor does.

 

[patra_is_here]

so 'race mode' is basically 'rich'? has anyone dyno'd this stuff that you know of?

 

[HUSKYnXJnWI]

race mode goes beyond "rich" cause you can enrichen it in standard mode and it wtill will not run as well as in "pu-mode". The computer is forced to "think" and make trim's on the map all the time and that causes delay or hesitation that is felt from the rider- so that's one of the reasons PU Mode is better from the seat. I don't know if that would show up on a dyno, but in demanding technical situations its huge.

As far as Dynocharts- Husky's have been dynoed and posted on here somewhere- But I don't know if they have been Dyno'd in Standard mode to compare- because most put in PU MODE immediately or right after break in.

When someone complains about how their bike runs- the first question that will be asked is if it is in Power up Mode- the 2nd question will be if it was hooked up to I/beat (stock efi tuner).

 

[patra_is_here]

thanks. follow up question, when the ECU is in race mode (no 02 sensor), how the hell does it determine AF mixture without an 02 sensor? sounds like it can't 'think' at that point. all it's gonna have is TPS and RPM signal to determine load, and at that point just run of a different map. 'race' map i suppose.

without EGT or O2 there's no real way for the ECU to 'think' per se. It would need a way to monitor the mixture in order to modify the fuel trims for peak power.

anyone got an engine management wiring diagram?

 

[jlk_250]

The FI system is a "speed density" type. You can read about it here or many other places. It does not monitor the fuel mixture or modify the fuel trims if the O2 sensor is disabled. It does measure air pressure and temperature in addition to throttle position and RPM.

http://www.motorcyclecruiser.com/te...el_injection_works/speed_density_systems.html

 

[Motosportz]

thanks. follow up question, when the ECU is in race mode (no 02 sensor), how the hell does it determine AF mixture without an 02 sensor? sounds like it can't 'think' at that point. all it's gonna have is TPS and RPM signal to determine load, and at that point just run of a different map. 'race' map i suppose.

without EGT or O2 there's no real way for the ECU to 'think' per se. It would need a way to monitor the mixture in order to modify the fuel trims for peak power.

anyone got an engine management wiring diagram?

Has a base map that it runs off with variables from the gear position, engine RPM, temp, altitude etc. The base map is modified by the input form these sensors every millisecond and modifies the squirt accordingly. It does compensates for conditions regardless of the sensor or not. 99% of the people will run the PU mod and find much more power / better running. The stock base map it to get it through emissions and "race" map is how it was supposed to run originally. The difference in power is huge.

 

[patra_is_here]

I am familiar with all types of FI systems.

whether speed density or otherwise, there is no advanced tuning without either EGT or O2, meaning, that in 'racemode', it's just a well designed static fuel map. but, from the sounds of things, husky really put in some work on that 'race map'. thanks for all the info guys!

 

[vespadaddy]

I am familiar with all types of FI systems.

whether speed density or otherwise, there is no advanced tuning without either EGT or O2, meaning, that in 'racemode', it's just a well designed static fuel map. but, from the sounds of things, husky really put in some work on that 'race map'. thanks for all the info guys!

question: does an '08 with the power up kit installed still have the ability to adjust fueling based on altitude?

 

[patra_is_here]

double post

 

[patra_is_here]

well, assuming the 'race' map still takes in to consideration intake manifold pressure then it should. at higher alt you'll see a drop in the intake manifold pressure.

essentially, you can think of the 'map' as a big equation . add all the sensor data together in some predetermined formula and that equals some injector pulse width (and possibly timing advance, idk). the maps are determined by a formula at the factory.