What do you think?
- Thread starter Blaster30
- Start date
The brand of air filter is less important than whether your lid is off or on when you are talking about jetting. The 0.10 over is not really a factor in jetting. You should not be running a 230 jet if you have switched to premix or done any modifications that effect the air/fuel ratio. We can only give you general guidelines for jetting. Every modification you make should be considered for a jet change and always confirm your jetting with a plug chop.
Foam is the best IMO for us dust makers because-
compared to paper or other filter technologies, "Open Cell" Polyurethane foam achieves optimum performance
against three key criteria:
Maximum Air Flow - the
ability to allow air to pass through without causing a
large drop in pressure.
Cleaning Efficiency - the capability to arrest a high proportion of airborne dust while feeding the engine
clean air.
Dust Load-up Tolerance -
the capability to absorb a
large amount of dust without reducing air flow capacity.
BTW- I stole that from this site!
SuperFlow flow bench testing N55 air box and filters - BMW 3-Series (E90 E92) Forum - E90Post.com
compared to paper or other filter technologies, "Open Cell" Polyurethane foam achieves optimum performance
against three key criteria:
Maximum Air Flow - the
ability to allow air to pass through without causing a
large drop in pressure.
Cleaning Efficiency - the capability to arrest a high proportion of airborne dust while feeding the engine
clean air.
Dust Load-up Tolerance -
the capability to absorb a
large amount of dust without reducing air flow capacity.
BTW- I stole that from this site!
SuperFlow flow bench testing N55 air box and filters - BMW 3-Series (E90 E92) Forum - E90Post.com
Last edited by a moderator:
Like I said, a general guideline is that with switching to premix, go up one jet size. Filter and airbox lid off, another 2 sizes. Exhaust, some more. Its better to start out high and plug chop down until you find the perfect jet size.
You havent listed all your mods so I cant tell you where to start. If you just have the air filter with lid off, and are premixing, I would say start with 260 and see where that is.
This link is your best friend
You havent listed all your mods so I cant tell you where to start. If you just have the air filter with lid off, and are premixing, I would say start with 260 and see where that is.
This link is your best friend
Here have a present from Oz!
Plug chop.
Warm up motor to operating temp.
Fit new B8ES plug, ride through the gears and hold WOT in 5th or 6th gear for 10 seconds, or as long as you can safely.
Switch off the motor and pull in the clutch, roll to a stop.
Take the plug out and replace the old one for the ride home.
Carefully cut the threaded end off the plug to expose the insulator.
There should be a smoke ring of a cardboard or biscuit colour around the insulator.
If it is non existant or a very light colour, you are lean and require a larger main jet.
If it is a lot darker you are rich and may go down a size in main.
I prefer to run a little on the darker side, I may loose a little power but it is worth it for the peace of mind that I won't need a rebuild so soon.
http://www.blasterforum.com/do-yourself-20/how-plug-chop-38674/
http://www.blasterforum.com/engine-13/plug-chop-how-vid-48226/
This is a good to go plug.
This one is a little rich, but I would run it, I like to be on the safe side.
Plug chop.
Warm up motor to operating temp.
Fit new B8ES plug, ride through the gears and hold WOT in 5th or 6th gear for 10 seconds, or as long as you can safely.
Switch off the motor and pull in the clutch, roll to a stop.
Take the plug out and replace the old one for the ride home.
Carefully cut the threaded end off the plug to expose the insulator.
There should be a smoke ring of a cardboard or biscuit colour around the insulator.
If it is non existant or a very light colour, you are lean and require a larger main jet.
If it is a lot darker you are rich and may go down a size in main.
I prefer to run a little on the darker side, I may loose a little power but it is worth it for the peace of mind that I won't need a rebuild so soon.
http://www.blasterforum.com/do-yourself-20/how-plug-chop-38674/
http://www.blasterforum.com/engine-13/plug-chop-how-vid-48226/
This is a good to go plug.
This one is a little rich, but I would run it, I like to be on the safe side.
