EGR driven Boost (or drive) sensor:

[McRat]

OK, I finally did this. A year late, but what the heck.

This can also be used for other sensors besides boost.

If you have a 12 volt supply (0-5V output) use the bottom row, left or right for the power. Not sure if it turns on or off though. It didn't when tested.

 

[McRat]

The "twin" guys are going to love this. We can record at least 100 PSIG boost for about $40 worth of parts without external datalogging!

 

[Noreaster]

What if you don't have an EGR?

 

[McRat]

This will only work on LLY's. Guess I should have said that.

 

[Diesel Pilot]

Awesome!

Pat what parts are needed to make this work? It will obviously be more reliable than the engines original boost sensor, right.

 

[LarryJewell]

Awesome!

Pat what parts are needed to make this work? It will obviously be more reliable than the engines original boost sensor, right.

:yup: My egr plug is just setting there doing nothing, its all taped up

 

[duratothemax]

awesome idea pat!!!!

 

[McRat]

Awesome!

Pat what parts are needed to make this work? It will obviously be more reliable than the engines original boost sensor, right.

The first sensors I ordered are hard to work with. I'm ordering ones more suitable.

But this will be "No BS" boost, unmolested by capping, and can go 150PSI boost if we desire. I'm set up for 100PSIG.

This is not my original idea, it had been discussed for a couple years by several people including Lennart.

When I get a "polished" system, I will do a more through write up and make the parts available.

We can read EGT's through this method as well.

 

[McRat]

I also verified that EFILive can indeed read this voltage. We have to make a custom PID to calibrate it.

 

[sweetdiesel]

Nice work Pat

LLY guys with a non VVT should also be able to use the vane pos sensor also

 

[McRat]

Correction: 60PSIG boost = 3.00volts on 100psi sensor. 0.50v = 0PSIG.

 

[McRat]

xMiter (McMaster 0-60PSIG) 1.03v at 0PSIG, 3.00 at 30PSIG, 5.03v at 60PSIG

 

[sweetdiesel]

We can read EGT's through this method as well.

:cool2:

 

[sweetdiesel]

What if you don't have an EGR?

This will only work on LLY's. Guess I should have said that.

Since certain lb7s had a EGR, We should be able to tap into the ECM??

Or perhaps use the MAF sensor?

 

[McRat]

The LB7 would need to have a EGR Position circuit for this to work. Dunno if it does.

I found that EFILive only report X.X resolution on the EGR circuit so far. This is not adequate for 100PSIG sensors. Needs X.XX.

In other words, the jump between 0.9 Volts and 1.0 volts is too great a change in boost. Each 0.1 volts is 2.4 PSI of boost. By getting X.XX resolution, that changes to .0.2 PSI per every 0.1 volts.

If I get a gauge that does 60PSIG, that will drop to about 1.4 PSIG per increment. That might be enough.