Lightflyer1
Top Post Dawg
The GTL fuel may still be usable. Not bio yet but hopefully BTL will grow into it.
I've encountered folks from the National Biodiesel Board several times in the last months at various events. Each time I suggest that by failing to mount serious pressure on manufacturers to design for standards-compliant Biodiesel as an approved fuel, they are sowing the seeds of Biodiesel's 'demise' - or at least conceding that it will be on the fringes for another decade.BeetleGo said:That's not OT Indigo. That's spot on. These new diesels really should be able to run upto B100 so that they continued to prove to people that we CAN skip the petro version of diesel AND gas.
DBW, are you still waiting for 2nd gen biofuels? They're not here yet.Drivbiwire said:The problem with 1st gen Biodiesel is it is VERY unstable at the temps found in the Common Rail systems. 2nd Gen fuels (Bio-GTL) to date (aside from conventional diesel) are the only fuels stable enough to handle the heat of the new systems.
I'd hate to see the inside of a rail and injector using Biodiesel, the varnish and gums that form can easily damage or clog the system and the miriad of pressure sensors and metering holes.
DB
You keep making this claim, but no evidence exists.Drivbiwire said:The problem with 1st gen Biodiesel is it is VERY unstable at the temps found in the Common Rail systems. 2nd Gen fuels (Bio-GTL) to date (aside from conventional diesel) are the only fuels stable enough to handle the heat of the new systems.
I'd hate to see the inside of a rail and injector using Biodiesel, the varnish and gums that form can easily damage or clog the system and the miriad of pressure sensors and metering holes.
DB
Do you have a plot of viscosity vs temp for ULSD and B100? I've looked around for such info, but can't seem to find it. Everything I've seen indicates that B100 falls within the spec range for ULSD.Mach1 said:The CRD is the worse possible diesel fuel system to try to test BIO in...
The fuel rail does not like BIO...May it be a 2L CRD or a Cummins CRD..
The variation of the viscosities of the BIO is going to play heck on the computer to try to hold the rail pressures with in spec. you will see this as it gets cold and temps change the viscosity.
Is there an audible difference in the engine from the fuel in colder weather? I bet that fuel pump is a squealing.
I have seen the fuel feed orifices in the PD injectors clogged by BIO, to the cost of $400 a piece- all four...The 2L CRD is alot higher tech engine then the PD's.
That may or may not be true at room temperature, but it's obviously not the case at low temps.rodneyh1 said:Do you have a plot of viscosity vs temp for ULSD and B100? I've looked around for such info, but can't seem to find it. Everything I've seen indicates that B100 falls within the spec range for ULSD.
Rose, here's a thought....The idea here is to figure out if the car can tell you how often it needs to regen using increasing concentraions of BD. You'll need to find someone running B100 in their 09 in your area for the experiement and VAG COM.rosycrown said:biodieseleyedoc,
I was delighted to read your post. I've been strongly considering buying a new Jetta. I've been waiting to hear some definitive results from Jason's experiment but with your experience posted as well, maybe I won't wait any longer. Someone at the Biodeisel Now forum said that the DPF problem can be eliminated by running a single tank of D2 occasionally. From postings here that describe the issue this seems a reasonable solution. I expect that you could accomplish the same thing with an occasional tank of B50.
Does anyone have a suggestion about how often this would be needed?
I think it would take a lot more than a couple tanks to see a difference, particularly at low BD concentrations. DoctorDawd is reporting a regen about every 300 miles, so maybe 1.8 regens per tank. If the cycles decrease with increasing BD, you'd probably need 10-20 tanks to see a difference. It may not change at all, depending on how VW has chosen to trigger the events.jaydogg007 said:Rose, here's a thought....The idea here is to figure out if the car can tell you how often it needs to regen using increasing concentraions of BD. You'll need to find someone running B100 in their 09 in your area for the experiement and VAG COM.
The good Doctor's VAG COM settings and information can be found here.
I believe he runs D2 only....you might want to ask him. So there's your baseline.
Now run a few tanks full of increasing concentrations of BD and keep VAG COM hooked up so you can see how often the car will regen. You know, maybe two tanks of B5, then two tanks of B10, two tanks of B20, etc. Maybe it won't take two tanks...but you'll definately want your D2/BD ratio to stay as consistent as possible. You'll also want to record when your test subject car uses any additives, as they can affect regen cycles.
What do you think? This would be very useful information for the hive.
Rod, Jason...have either of you collected any VAG COM regen information?
j...
This guy is having no problems apparently.rodneyh1 said:Based on the symptoms I've read here (very hot smell, fan running on shutdown, etc), I believe my '09 when through at least a few active regen cycles when using B99. No VAG COM info, however, so I can't be certain. I ran B99 for 4K miles, ULSD for 3.5K miles, and will switch back to B99 in a month or so (at 10K).
Is the European emissions equipment the same as the North American stuff? If not, can they be logically compared?rosycrown said:jaydogg007--European BD forums suggest (and perhaps I don't understand this properly, I'm not a mechanic) that the computers are adaptive and need to be "trained" by starting with a low concentration of BD and progressively increasing. How would that effect the result you are suggesting?
The dash has a light to show that the particulate filter is plugged because it is past due on a regen, and you need to take it out and drive it at 40 mph NOW! There is no light indicating that the car is currently undergoing regen. Check your owner's manual - page 243.Neurot said:can someone point to the post about regens being reported? the dash has a light to show regen, but it's never lit up in my 4300 miles...