Turbo

[Q500]

On the KMS Turbo kits the AFR is controlled in real time by auto tune which is set to 12.5.
The auto tune keeps it pretty close to that.

Not sure how it's set and controlled on BD kits.

That's all fine and dandy but even the oem vehicle manufactures have a history of catastrophic failure from high egt. IMO it would be a great fail safe to have a probe and a couple more wires for an alarm when getting close and a defuel map when hitting a certain threshold. One of the simplest most effect safety's on a turboed anything when pushing the envelope. What is a safe egt on a mx motor and for how long? Melted pistons and stuck rings can get rid of a lot of oil in short order!

 

[cr500afx]

That's all fine and dandy but even the oem vehicle manufactures have a history of catastrophic failure from high egt. IMO it would be a great fail safe to have a probe and a couple more wires for an alarm when getting close and a defuel map when hitting a certain threshold. One of the simplest most effect safety's on a turboed anything when pushing the envelope. What is a safe egt on a mx motor and for how long? Melted pistons and stuck rings can get rid of a lot of oil in short order!

EGT vs AFR. IMO both have their pluses and minuses. AFR great for tuning, EGT for safety. However in my experience the EGT instrument works well on steady power situations, which is not typical on how I ride a boosted snowbike. I'm rarely at the same RPM, boost, throttle position, for very long. More typically I'm working the throttle, shifting gears fairly quickly, on and off boost, which makes useful EGT info fairly difficult. Maybe there's some new EGTs out there that react more quickly than the old ones I'm familiar with.

 

[Q500]

Quickest I've found http://www.auberins.com/index.php?main_page=product_info&cPath=20_3&products_id=69

 

[raytherace]

Could we see some pics of it install?

https://www.facebook.com/media/set/?set=a.758192234207730.1073741828.186952411331718&type=3

 

[cr500afx]

I know some bikes have a much lower rev limiter (like around 9500) than most race 450s. My buddies KX is 11,000. When looking at the BD controller I noticed the same thing, measurable boost really didn't start to get produced until 7,000 rpm. Only having a roughly 2k RPM window seems awfully tight on those lower RPM bikes. Does anyone think that engine characteristics such as max RPM should be considered when picking a boost platform or can the system be tweaked to produce usable horsepower at lower RPMs?

Boost novice here.

The closer the turbo is to the exhaust port the less turbo lag and the more useable horsepower at the lower RPM's.

 

[carbondaddy]

We had the t-501 out yesterday with the updated BD contoller. It worked much better than without the update. The higher RPM miss was gone and it fueled very nicely. It was still easy to bounce off the rev limiter, but that's partly because of the stock limit being so low(9500 rpm). I can see how the MX 450's bikes would have real advantage with their higher rev limiter setting. Does anyone know if the 500 ecu can be re-progammed with a higher rev limit?

 

[slickace15]

Updates

Latest ride reports? Gripes, bitches or complaints? Help us thinking about it figure out what to do. Thanks guys

 

[Mtn. Muncher]

I have both a BD turbo 500 and a 450. The 450 is hands down a better bike to turbo simply because it rev’s 1500 RPM higher and has a longer power band because of it.

 

[slickace15]

Lag?

I have both a BD turbo 500 and a 450. The 450 is hands down a better bike to turbo simply because it rev’s 1500 RPM higher and has a longer power band because of it.

How does it pull? Rpm? Boost levels? How much lag?

 

[raytherace]

Here a little clip of me riding my YZ at 9 psi of boost.


http://www.youtube.com/watch?v=Uff1eObiyLM&feature=c4-overview&list=UUhwfvNpjFMzVJErgBl-hhqw

 

[up-high]

ST or LT? Clutch lock out?

 

[raytherace]

LT. I have a wiseco clutch basket and wiseco disk/spring.