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Old 11-19-2008, 10:23 AM   #1
johnnydanger OP
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G650X: How to richen mixture?

So I've had varying success with improving performance on my X. I initially swapped out the filter for a touratech foam one, and removed the inner airbox baffle. Things seemed to improve a bit performance wise but some lean running issues popped up: surging, popping on decel, and a tendency to die 4-6 times before warming up. I've reverted back to the stock airbox and filter setup and the tendency to die on cold start has gone.

My question is: after installing a freer flowing air filter, removing the airbox baffle, and installing an exhaust, how are people richening up the mixture to suit? It seems like the popping with an exhaust would be unbearable.

Any help would be appreciated. Thanks.
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Old 11-19-2008, 12:45 PM   #2
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I've seen this on Ebay:
http://cgi.ebay.com/ebaymotors/BMW-G...18#ht_3122wt_0

Seems like it would do the trick.
BTW, my Xch does the occasional cold weather "stall from idle" even with everything being bone stock.

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Old 11-19-2008, 01:17 PM   #3
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I'm using the same Unifilter and did not do any other mods to the airbox and it runs fine.. None of the symptoms you describe.
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Old 11-19-2008, 01:23 PM   #4
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Hello,
The easy way is a larger Jet.
The engine runs org. extrem lean.
The org. Jet has 237g/min.
Look by VW or Bosch.
There you get what you need.
You need a Jet around 260g/min.
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Old 11-19-2008, 02:01 PM   #5
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I Have The Airbox Lid Removed With The Uni-filter And The Full Remus Titanium And I Have Not Had Any Problems With Stalling Or Running At All. I Am However Very Interested In The Larger Fuel Injectors. Is The Factory Computer Able To Adjust The Mixture Enough To Get The Proper Amount Of Fuel And The Injector Is The Only Thing Holding It Back? Or Do You Still Need To Run A Power Commander Or Something Of That Sort To Get The Desired Amount Of Fuel.

P.s. How And Where Can I Find A Larger Injector That Fits, Obviously They Are Not Just Online Listed Under G650x
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Old 11-19-2008, 02:25 PM   #6
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"How And Where Can I Find A Larger Injector That Fits,"

Bosch, VW,
Xch Jet is the same like on cars.
You don't found it by BMW motorcycles.
If you don't like another Jet,
make more Gasoline Pressure.
The org.Pressure was konstant 3.5 Bar.
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Old 11-19-2008, 05:54 PM   #7
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Quote:
Originally Posted by FlyingFinn
I've seen this on Ebay:
http://cgi.ebay.com/ebaymotors/BMW-G...18#ht_3122wt_0

Seems like it would do the trick.
BTW, my Xch does the occasional cold weather "stall from idle" even with everything being bone stock.

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That is a cool item, however has anyone tried this and what does the MPG do with it? Does it hold at about the same level or does it drop and if so how much?
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Old 11-19-2008, 11:38 PM   #8
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Try this: http://www.powerfrk.com/en/default.htm
...and tell us how does it works
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Old 11-20-2008, 12:38 AM   #9
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Quote:
Originally Posted by HP2
Hello,
The easy way is a larger Jet.
The engine runs org. extrem lean.
The org. Jet has 237g/min.
Look by VW or Bosch.
There you get what you need.
You need a Jet around 260g/min.
Peter

Hi peter, nice seeing you here (I read your work on the German Forum, impressive!!). On an only mildly modified engine does the bigger injector work?

I have the inner airbox cover removed and use the Leo exhaust. I'm planning on using a Twinair filter as well. I noticed both low RPM and top end has improved (not much maybe, but everything counts). I have no surging or stalling issues, but I do have some popping on decellerating. What I fear most is that by openening up the intake a bit like I did, might cause the engine to run too lean. Especially on WFO stretches (desert, 120 km/h plus), where the injection works in open loop. As long as it's working on closed loop (small throttle openings, steady speeds) the mixture will be corrected by the input signal from the lambada sensor right?


Where can I find a parts number for the described Bosch injector? I take it the bigger injector doesn't do much in closed loop but richens the engine up once you open the throttle?
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Old 11-20-2008, 12:46 AM   #10
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PS, I find a list of Bosch injectors here. Which type should I use? "EV1", "EV6" or "EV6 long body"?
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Old 11-20-2008, 12:59 AM   #11
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Hi Max Kool,
The standard Version.
The best way you can do:
If you have no KAT in your Muffler,
take a good Lambda Meter in the Muffler.
Arround 0,90-0,95 is perfekt.
If You have a Kat, weld a piece in, 18x1.25???
for the Lambda Sonde.
I think you have no Luck by Bosch.
But VW or Audi have it 100%.
My big one is from Porsche.

http://users.erols.com/srweiss/tableifc.htm

Org.Jet Nr: 0280 158 058

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Old 11-20-2008, 01:07 AM   #12
Max Kool
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Wow, nice info!!

What is the type (sr number?) of the stock injector? Oeps, you already stated that.

Anway, I still have the lambada sensor connected, but no kat. So there is still a closed loop in place.
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Old 11-20-2008, 01:12 AM   #13
HP2
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No No No,
Your org. Sensor must al the time connectet!!!!!
You need with Kat a extra hole for the LambdaMeter Sensor.
Without Kat? only in the Muffler Outcome.
Peter
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Old 11-20-2008, 01:17 AM   #14
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Yeah I understand. And then you measure the lambada value at what rpm? under full throttle I assume?

I just want to try the next larger injector just to be on the safer side of lean. Let's say with 5 - 10% extra fuel flow.

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Old 11-20-2008, 01:51 AM   #15
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Quote:
Originally Posted by HP2
Hello,
[...]


You need a Jet around 260g/min.
Peter
Is there a sr nr available for an injector of around this flow rate? like the 0280 156 081?

Max Kool screwed with this post 11-20-2008 at 02:32 AM
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