[nicklockard]

Hello,

I need to appeal to some of the very knowledgeable people here for help with something:

I want to setup my water injection based on a 3D map from:

Airflow on x axis
Fueling on y axis (prefer to use Injection Quantity if available, but could substitute lamda from WB-O2 sensor if fast responding).

I've chosen the torquebyte controller. It accepts

-> 3 analog 0V-5V inputs
-> 3 logical True/False inputs
-> RPM signal (pulses per minute).

I can can get air mass flow rate in a 0V-5V signal range if I purchase and install a VW based thin film MAF. It shouldn't matter if it's not calibrated for the 335D intake because I can use the 3D mapping to adjust flow as desired based on 'what works best' (dyno runs, torque runs, apparent smoke, butt dyno, trial and error, etcetera).

But I don't know how to get fueling or Injection Quantity (IQ) as a 0V-5V analog signal.

Is there any direct or indirect fueling or IQ signal that can be used for this?

If there really isn't a direct fueling signal in the preferred form, is the O2 signal a reliable enough signal of A/F ratio or lamda value? I read that the 335D's Bosch LSU4.9 wideband O2 sensor reads between 0.65 - 2.25. lamda or (9.55 - 33 AFR range) (0.510V - 2.614V). What is response time like? (Edit: according to my yellow belt google fu, it is around 100ms or slightly faster.)

[TDIwyse]

Originally Posted by nicklockard

...
But I don't know how to get fueling or Injection Quantity (IQ) as a 0V-5V analog signal.

Is there any direct or indirect fueling or IQ signal that can be used for this?
...

Have you tried the rail pressure sensor? I think this was how the prototype BMS JBD based water/methanol controller was setup to control injection. Might want to check with Hooper on that as he was running that.

http://www.e90post.com/forums/showpo...&postcount=305

[335dlci]

Originally Posted by nicklockard

Hello,

I need to appeal to some of the very knowledgeable people here for help with something:

I want to setup my water injection based on a 3D map from:

Airflow on x axis
Fueling on y axis (prefer to use Injection Quantity if available, but could substitute lamda from WB-O2 sensor if fast responding).

I've chosen the torquebyte controller. It accepts

-> 3 analog 0V-5V inputs
-> 3 logical True/False inputs
-> RPM signal (pulses per minute).

I can can get air mass flow rate in a 0V-5V signal range if I purchase and install a VW based thin film MAF. It shouldn't matter if it's not calibrated for the 335D intake because I can use the 3D mapping to adjust flow as desired based on 'what works best' (dyno runs, torque runs, apparent smoke, butt dyno, trial and error, etcetera).

But I don't know how to get fueling or Injection Quantity (IQ) as a 0V-5V analog signal.

Is there any direct or indirect fueling or IQ signal that can be used for this?

If there really isn't a direct fueling signal in the preferred form, is the O2 signal a reliable enough signal of A/F ratio or lamda value? I read that the 335D's Bosch LSU4.9 wideband O2 sensor reads between 0.65 - 2.25. lamda or (9.55 - 33 AFR range) (0.510V - 2.614V). What is response time like?

You could use a egt temp sensor for a safety also. I just bought an unit also. Haven't installed mine yet. Are you also going to use boost pressure to adjust injection %?

[nicklockard]

Originally Posted by TDIwyse

Have you tried the rail pressure sensor? I think this was how the prototype BMS JBD based water/methanol controller was setup to control injection. Might want to check with Hooper on that as he was running that.

http://www.e90post.com/forums/showpo...&postcount=305

Thanks Wyse. I'll be digging into that for sure. Thanks

I've edited my post to change that according to a few google links, the response time of the wideband O2 sensor appears to be around 100ms or slightly less.

[nicklockard]

Originally Posted by 335dlci

You could use a egt temp sensor for a safety also. I just bought an unit also. Haven't installed mine yet. Are you also going to use boost pressure to adjust injection %?

Yes I will use EGT signal for one of the maps.

I want to make several maps. It's one of the reasons I like the torquebyte:

1. EGR for safety of turbos (2d map)
2. A 3D map based on net turbo inefficiency (max EMP/max IMP)--so yes there's the boost pressure signal. I'll use the provided 4 bar map sensor from torquebyte. Is the EMP sensor 0V to 5V?
3. A 3D map based on NOx sensor signal (is it a 0V-5V?)* air mass flow.
4. A 3D map based on airflow and fueling as mentioned in my first post. I'll probably input RPM's on this map too if I can program it for that many variables.

[kydiesel35]

Nice! Looks like you have some work cut out for you.

I'm still running the controller, very happy with the results. Definitely use the RPM signal, our cars can spool up way premature for meth injection just based off boost. Without "start at" this RPM your susceptible to quench.

You will soon learn this controller is more capable than you think. Alex @torqbyte can help with whatever, their customer service is top notch.