Compressd Natural Gas conversion

[burn_your_money]

I wouldn't run it on a NA engine but a TD engine sure.

Why not?

[zukgod1]

Mainly because of the lack of performance on a NA engine. If you could regulate it properly I don't see why you couldn't but I don't think there would be enough gain to justify it..

[truckoSaurus08]

Wow thats really cool. Always wondered how it would work in a diesel. Is this basically the same set up as a gas/cng conversion?

[zukgod1]

Wow thats really cool. Always wondered how it would work in a diesel. Is this basically the same set up as a gas/cng conversion?

Very similar, less things required on a diesel conversion though. Only uses the TPS and CPS the rest is all programing.
On a Gasser conversion it uses the above along with O2 sensor, injector emulators, MAP sensor modules and so forth.

Some of the Gasser kits use individual injectors for the CNG, we actually have to drill the intake manifold for the new injectors which are really only nipples screwed in, the injector is remote mounted somewhere else.

Filled it up this morning, took a whopping $4.85..

[Turbinepowered]

I plan to go injected when I go propane in the Bug, simply because I'm m-squirt it and have a switch for the injectors, gas or LPG, and use the same ECU.

[zukgod1]

that sounds like it just may work..


I did some more tuning yesterday and am having issues getting the stepper motor to open higher at freeway speeds.. There is a step in the programing I"m not familiar with just yet so when I figure that part out should be right where I want it..

So far I've traveled 180 miles on less than 1/4 tank of diesel and one LED light on the CNG gauge.. Dont really know how much I'm using until it's fill up time then I should be able to figure out what ratio I'm running at..

If I have a MPG read out in the cluster (or a Scanguage)  it would be easier to tune as I could just watch the MPG change to figure out where I am but till then

[burn_your_money]

Updates?

You pretty much have me convinced to go CNG

[macka]

updates please 
 

[zukgod1]

Sorry guys, been mega busy. We are expecting a baby sso we are switching the lids from room to room so the baby will have a room close to us.



I dove all week 60+ miles a day and used 1/8 a tank of fuel.. filled the CNG tanks and it took 4 gallons $4.00.

I'm not going to fill the diesel tank till it's empty, bets on how long it's going to take? I dont think  I rest my trip meter so I can see how far I gt out of the diesel with the CNG supplement.


The power if just a blast!!!
I still have some programming changes to make, for some reason I cant get the stepper motor to open slowly. It opens to full open as soon as the system is activated which is currently set to .8 volts from the TPS and 1200 rpms. I can control the speed it closes but the opening speed is giving me fits. The way its working now if I'm taking off fast/ adding lots of diesel it just lites the front tires like nothing and smokes like a freight train. If I take off slowly it drives fine but if I could adjust the opening speed better (read at all) I could control the smoke levels better.
I have it set so when I hit the cruise control to open the valve to a setting of 375 ( have from 0 to 500).


Just FUN to drive now. When I first got the car it had 129k on it with the stock nozels in it still, just had the timing belt done and new valves as the previous owner neglected the timing belt.
The "Diesel Repair shop" didnt set the timing so it was set at -4.0 AFTD.. It still drove pretty good and would take off pretty good (torque), after an AFE intake, muffler ectomy and setting the timing to 2.6-2.8 BTDC it drove much better. Add in some .216 nozzles and holy crap it was WAY fun now!!
Adding the CNG kit was like all the above mods 2 more times and all at once. 

[AudiVWguy]

How far away is the local dyno place?

[zukgod1]

How far away is the local dyno place?

45min to a hour maybe..

[Smokey Eddy]

Jesus...
sounds like cars should come from the factory like this?
What kind of mileage would a 2 cyl TD smart car get if it ran CNG?
im actually super stoked to see your dyno/mileage reports.
My next car is likely going to be something non-vw with a TDI in it. I'd love to do the same.
All sorts of injection hahah NO2, CNG & water.

I noticed you said on the other forum you had a small CNG leak, did it stink the car to high heavens with rotten eggs?!

Also, where do you go to fill the tanks? You know, it wouldn't be a far stretch to tap into your houses natural gas line - but then i guess it wouldn't be at a high enough pressure would it? it also might be extremely illegal. but seriously, where do you get the tanks filled?

[zukgod1]

Jesus...
sounds like cars should come from the factory like this?
What kind of mileage would a 2 cyl TD smart car get if it ran CNG?
im actually super stoked to see your dyno/mileage reports.
My next car is likely going to be something non-vw with a TDI in it. I'd love to do the same.
All sorts of injection hahah NO2, CNG & water.

I noticed you said on the other forum you had a small CNG leak, did it stink the car to high heavens with rotten eggs?!

Also, where do you go to fill the tanks? You know, it wouldn't be a far stretch to tap into your houses natural gas line - but then i guess it wouldn't be at a high enough pressure would it? it also might be extremely illegal. but seriously, where do you get the tanks filled?

Leak;  Everything is vented outside the car so I will never smell the CNG in the car if there is a leak in the future.

Filling; Utah has lots of filling stations. There are 4 between work and my house. The have home filling stations available and I would love to get a home fill station but the cost is just too damn high. $3k and up for one and where I can fill easily from a public station it's just not practical.
And yes the pressure at the house isn't enough thus the fill station is required

Dyno;  I dont really see me putting it on a dyno to prove I have more power. I can feel it and this is for me.. If the dyno was free I would do it but I'm not paying to get a piece of paper showing the increase. I'll race a couple buddies that beat me before the conversion though 

Fuel logs; As I already keep track of my mileage I'll post these up. Thus far I've drove over 300 miles on a quarter tank of fuel (as per the gauge). Once the diesel gets down to my usual refilling level I fill it up and do some figuring..

[Smokey Eddy]

okay well if your tank was 55 litres... 1/4 of that going 300 miles is like 82mpg of diesel minus the natural gas which you got for $1.33/gallon pretty much right?

[zukgod1]

Natural gas is $0.93 pr gal here 

$1.00 at the expensive places.


My goal is to have it tuned so at freeway speeds I'm running 80+% CNG and 20% +/- Diesel.

It's takes quite a bit of time to get it where it needs to be when the only real tuning time I get is on the way home and back to work.
Have to be REALLY careful, this is worse than texting and driving.