TDI Bosch IP max fuel screw - Defender Source
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  #1  
Old September 18th, 2011, 08:59 PM
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mark kellgren
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TDI Bosch IP max fuel screw

is the circled screw in my pictures the max screw? If so, can someone clarify exactly what it does? does it increase the fueling along the entire throttle range, or just at the top end? I have not had any luck on the web finding a picture of the screw, even though it is referenced quite a bit. I think I have everything else straightened out and in place to start tampering. I just need a little more juice on the highway and that's it. Seems to be beyond what I can get from the boost diaphragm.
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  #2  
Old September 18th, 2011, 09:06 PM
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Yes, this screw does change the fuel delivery quantity over the entire throttle range. You want to adjust it incrementally & slowly, 1/4 turn is a big change in the fuel quantity delivered. For more info on it look at some Dodge cummins sites, theres lots of good info there on fuel adjustments to the Bosch VE injector pumps.
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Old September 18th, 2011, 09:09 PM
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mark kellgren
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Thanks. as for the tamper collar, do you see it on mine? Don't want to go cutting the wrong thing.

Ok, I found a good link for illustration. Thanks Dennis
http://mopar.mopar1973man.com/cummin...p/inc-pump.htm
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Old September 19th, 2011, 06:00 AM
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Just get a screwdriver/small pliers into that tamper proof collar, lever it off and throw it. it's only where the pump was initially set up at the factory they then fit the collar for warranty issues.
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Old September 19th, 2011, 10:11 AM
reb78
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I found that you could get adequate adjustment on that screw without removing the collar. I've turned mine about 165 degrees and it makes quite a difference. Bit more smoke, but not excessive.

This site has a fairly good description as well:

http://dodgeram.org/tech/dsl/more_power/Power_ve.htm
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Old September 19th, 2011, 10:14 AM
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The attached PDF is also handy for those 'tweaking' their pumps. It doesnt describe the adjustment of the fuel screw though.

tdi pump tuning.pdf
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Old September 19th, 2011, 06:34 PM
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mark kellgren
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Thanks all! I was able to knock that anti-tamper sleeve off very quickly with a flat head screwdriver! No other tool required.
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