781-588-3968 bobtec@comcast.net

CNGVW 037Here are some pictures and install information for my CNG Blend kit.

The kit is very simple, and has only a few parts. The main one is the 2 stage regulator which takes the high pressure CNG from 3600 PSI down to a few LB to be breathed in to the engine intake.

The line from the tank and coolant line have been installed already.

Next, the feed tube placed in the intake track.

Then the feed tube and flow adjuster are installed.

The little gold screw is used to regulate  HP for the kit.

Here it is installed very clean and simple.

There are only a few wires that need to be hooked up. I use the power from the injector pump as its key on source.

We used one of the crank sensor wire as the tech signal. A ground is installed and one wire for the gas on solenoid. You just have to clip the fuel pressure/ gas gauge contactor on.

Now run the switch in the car.

For added safety I install the ETS  into the turbo dump pipe.

This is used to turn on the CNG system and off if the temp gets too high – a must on a diesel.

I use one from http://thesensorconnection.com. It was modified for the TDI and worked very well.

Inside it is just a simple on and off switch with some LED to show how much CNG you have in the tank.

Below, the ETS on the left is the $200 one. It can be adjusted to turn on the CNG at a low  temp and shut it off if the EX temp gets too high. I set it to come on at 300F and shut off the CNG blend if it goes over 1000F to be on the safe side.

It can be adjusted at any time.

The one on the top right is the one that will just shut it off if you hit its high limit of 120F, and the little switch on the bottom right is the CNG on/off and gas tank level LEDs .

And there you have it.

Here is what one test driver said on a forum:

“So since I’m only about 30 miles away in Cambridge I went and checked the car out. Bob had me drive it, I would compare the car drivability-wise the same as any other MKIV TDI you would get in. Power was comparable to something over a chipped car. It’s very smooth, and if you blindly just got in the car and drove it, you wouldn’t know it had the CNG other than the extra power, much like you wouldn’t know the difference if you were running bio. Difference is no gross odors like veggie, no messes from home-brew, just a little pump outside the house. I thought it was cool, only thing stopping me right now is the initial cost to get it going. But as I said before I think the costs would be covered in about a year from what I’ve figured. Fuel is easy to pay for on a week to week basis but as a lump sum it will take some saving. I’m fortunate enough to have gas at the house so this is a realistic option for me. I think the point is being missed here, he seemed to be a pretty good guy and not a salesman. Just sharing results of the project much like you see all over the boards so I don’t know why everyone seems to have an issue with this.”

To up date the CNG Diesel testing here are some Massachusetts emissions tests on Diesel tail pipe tests before and after CNG blending:

Below is the test with it just on Diesel

With the CNG blend, it is a reduction of 400% in tail pipe particle matter.

See my Youtube video: http://youtu.be/Yem6t6GQrc8 of the car running on CNG.






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