Tuning BD box for mid range lean spot

[Dogmeat]

I've been sort of playing around with this for a year now but I can't quite get it ..

I have a BD turbo kit,and %99 of the time it is just slightly rich which I am fine, with.

But, if I go on long trail rides where I'm at about 1/4 throttle, 5500-6500 rpm or so, my EGTs always want to shoot way up past 1300 F.... which is too hot.

I've messed with the RPM settings, the ExhV settings, etc ...

As I understand it, the ExvH setting work like this:

IF exhaust valves = closed AND RPM >Min (~5500) AND RPM < Max (~7200) then <add fuel>

Problem i, I keep setting this and it still leans out.

Any ideas?

 

[never enough snow]

Have you wired your box in to the servo motor wire So it no,s when to add fuel

 

[Dogmeat]

Have you wired your box in to the servo motor wire So it no,s when to add fuel

No, I thought it based when to add fuel on that 'ExV > XXX' setting ... whatever 'XXX' was ... 140-200 or so.

The instructions I have don't specify what that number actually is nor anything about wiring the box to the exhaust valve actuator.

 

[WyoBoy1000]

You can add all you want, the stock pipe sensor reads temps and cuts fuel to hit emissions, I also think it does something to the timing but can't say for sure. If you add to much it will cause all kinds of problems and if you take fuel out the stock ecu adds fuel. At least from my experience, you could try putting a resistor in the place of the sensor and see what happens.

 

[Arctic Thunder]

No, I thought it based when to add fuel on that 'ExV > XXX' setting ... whatever 'XXX' was ... 140-200 or so.

The instructions I have don't specify what that number actually is nor anything about wiring the box to the exhaust valve actuator.

you need to splice in a wire from the servo control wire so the BD box can read the voltage to the servo motor. It will then depending on the rpm and the voltage increase fuel.

when the servo motor is closed (valves down) it will have minimal voltage, but when the ecu tells the system to open the valves the voltage will change, and if the settings are correct, ie rpm/voltage it dumps the fuel.

I had to do this exact same thing on a 07M1000 I had. Honestly I HATED it. I finally got it to work but a PITA.

If I had to do it over again i would go with an attitude box. don't know if would have fixed the problem either but BD has so much adjustment it get frustrating trying to get it perfect.

(ps I am not sure it is reading voltage it could be resistance, I don't know but they have a specific range) (so whatever it is)

Thunder

 

[matt159]

you need to splice in a wire from the servo control wire so the BD box can read the voltage to the servo motor. It will then depending on the rpm and the voltage increase fuel.

Thunder

Correct on wire splicing. I adjusted this on my m8 last year & got that lean spot to go away that you are having trouble with. When I updated the kit this year, there is not a wire on the new BD harness for it... so may be a little complicated if you have a newer kit.

 

[Dogmeat]

Correct on wire splicing. I adjusted this on my m8 last year & got that lean spot to go away that you are having trouble with. When I updated the kit this year, there is not a wire on the new BD harness for it... so may be a little complicated if you have a newer kit.

I have a 2010 BD box, I bought the turbo kit August of 2010 ....

It doesn't even say in the instructions I have for it that there is a connection to splice anything in.

I'll call BD about it.

 

[jhurkot]

Don't run a turbo in the mid range, play with the throttle on the trail until you get to the good stuff.

 

[matt159]

It doesn't even say in the instructions I have for it that there is a connection to splice anything in.

I'll call BD about it.

What was BD's answer? I'd like to hook mine back up, but haven't had time to call them during the day to find out how...