Hi I have an 02 2500 duramax with the edge with attitude and propane injection and when I run the 0-60 timer on the edge it looses 0.4 to 0.5 seconds with the propane on than with it off . does anyone have any idea why this is doing this shouldn't the pane make it FASTER? Thanks for the help.
:ro)

Adding power does lose time on your 0-60.

Adding power does lose time on your 0-60.


Why power makes you go faster doesn't it ?
Atleast thats what I thought.

Do you have a stock transmission? If so, you can slip the transmisson and go slower with more power.

Does it smoke a lot more with the propane?

I think McRat means that with more power your 0-60 times should be faster and therefor you are losing time. So in your case you are actually gaining time.

Adding power reduces your 0-60. Example: Stock 7.2 seconds, modified 6.9 seconds.

You "lose" time.

I'll assume your numbers increased with propane. Go to a dyno or a 1/4mi track to verify. If you are losing HP and increasing ET, then you need to probably back off the pane. If you are gaining HP and increasing ET, then you need to let your trans learn or work on different launch techniques.

Do you get smoke even without propane? If so, I would suspect the following: Propane displaces air, so when lp is going in, the engine is getting a bit less oxygen. So, if you are short on oxygen without the lp, it will compound the problem if you add lp. A gasoline engine makes 4% less power on lp than gas because the lp goes in as a vapor and displaces air. The 4% is constant because the air-fuel mixture is constant on a gasser. A diesel will be affected in a similar way, but since the mixture varies, the O2 displaced by the lp will vary also. I find it interesting that my engine runs less boost w/lp on than w/o at the same power level. At 70 mph, diesel only, mine runs 4 lbs boost. W/lp on, it runs 2.5 lbs. I believe this is because at light load, the lp is burning some of the O2 than normally would go out the tailpipe unburned because the diesel mixture is lean.

i see your results as well, lp lowers boost, offers more tq, better mileage, but will rise egts when load is increased like a large grade ;)


Do you get smoke even without propane? If so, I would suspect the following: Propane displaces air, so when lp is going in, the engine is getting a bit less oxygen. So, if you are short on oxygen without the lp, it will compound the problem if you add lp. A gasoline engine makes 4% less power on lp than gas because the lp goes in as a vapor and displaces air. The 4% is constant because the air-fuel mixture is constant on a gasser. A diesel will be affected in a similar way, but since the mixture varies, the O2 displaced by the lp will vary also. I find it interesting that my engine runs less boost w/lp on than w/o at the same power level. At 70 mph, diesel only, mine runs 4 lbs boost. W/lp on, it runs 2.5 lbs. I believe this is because at light load, the lp is burning some of the O2 than normally would go out the tailpipe unburned because the diesel mixture is lean.