02-11-2004
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#1
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Join Date: Oct 2003
Location: White Bear Lake
Posts: 109
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I was doing a little logging today and noticed that I was having almost 0 knock count across the board, good o2's around 0.9 - 0.92, but was maxing out my injector d/c at 100%. Mods on the car include 2g mas, 550's, supra s/m, ic piping, walbro 255, 14b running 15lbs, and an afpr with base fp set at 42psi. Even adding in the cold air the injectors shouldn't be open that much should they?? Opinions?
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02-12-2004
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#2
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back in the saddle again
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2g mas figures to be 18-22% leaner than factory
550's at 43psi baseline are 22% richer than factory.
at 15psi, its possible, 02 voltage shows a little rich, but without timing curves and a wideband its hard to tell.
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My street car runs low 11's and my race car's personal best is a mid 11....
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02-12-2004
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#3
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Hellbound
Join Date: Nov 2003
Location: St Paul
Posts: 1,390
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His eprom chip has the 2g mas calibration values in it, as well as compensation for the 550's, so it shouldn't run any leaner/richer than with a factory 1g mas/injectors.To me it doesn't seem like actual %100 duty cycle would be likely or even possible with that setup, I'm more book educated than experience educated though.
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-Nulli Secundus-
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02-12-2004
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#4
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Business as usual
Join Date: Oct 2003
Location: Isanti, MN
Drives: Dodge Viper and Honda Insight
Posts: 2,206
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Do you have a SAFC to tune with? If so, turn up the fuel pressure a bit and lessen teh injector signal on the SAFC. If you do not have a SAFC, I recommend one.
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97 Viper GTS
03 Mercedes CLK500 rollin on dubs...
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02-12-2004
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#5
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formerly ecoli
Join Date: Oct 2003
Location: On the dyno
Posts: 4,892
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Anyone else ever have trouble believing the duty cycle numbers that people get out a lot of these loggers? I think everyone is running 95-110%.  |
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02-12-2004
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#6
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Join Date: Oct 2003
Location: Fargo, ND
Posts: 181
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I have grown very biased against the logger as i've noticed they have glitches in their programs as well. I compared 2 seperate loggers on my 93 TSI awd w/ very different result in 02 trim/voltage and knock counts.
No way your maxing out 550's w/ a 14b @ only 15 psi unless your have some junk injectors.
Nick
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02-12-2004
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#7
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R U DTF bro?
Join Date: Aug 2003
Location: Oak Point, TX
Drives: C8 Stingray Z51
Posts: 20,620
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I know me and CVD both have gotten up into the 130's with 550 injectors on 16G's...no way that can be accurate.
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Quote:
Originally Posted by Murlo26
I agree with Kracka.
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02-12-2004
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#8
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Captain J-Sack
Join Date: Oct 2003
Location: Chicago, IL
Posts: 594
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i am going to be logging my car and i have rc 550s and 2g maf this weekend so ill tell you what kind of duty ill be pulling
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02-12-2004
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#9
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Join Date: Oct 2003
Location: White Bear Lake
Posts: 109
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I'm having a hard time totally believing in the d/c readout right now since I was at 80-100% on the stock injectors...
But I did forget to mention as lightning added that I have an eprom chip calibrated for 550's and a 2g mas. With that in mind, shouldn't the ecu be calibrating the appropriate amount of fuel accordingly? If that was the case isn't 100% way too high? I would think it should be more like 50-60% range, but that's just my guess. BTW, I do have an afc, but it's zeroed out at the moment. I'll see if I can get any different results upping the fp and lowering the afc a bit.
Jacek - let me know what you get for numbers....although you'll be different if you don't have the same ecu as I do...
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02-12-2004
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#10
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Hellbound
Join Date: Nov 2003
Location: St Paul
Posts: 1,390
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Quote:
Originally posted by TalonTSiDude@Feb 12 2004, 12:33 PM
I know me and CVD both have gotten up into the 130's with 550 injectors on 16G's...no way that can be accurate.
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130% duty cycle? Thats impossible, If you get percentages over 100 your logger is wrong, duty cycle can't exceed 100%.Did anyone notice the injector pulsewidth and RPM when you got these numbers? Its easy to calculate actual duty cycle with pulsewidth and RPM.And yeah actual 100% duty cycle is very bad, your ecu no longer has control of fuel.
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-Nulli Secundus-
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02-12-2004
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#11
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Join Date: Oct 2003
Location: White Bear Lake
Posts: 109
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I went out today and took a few logs this time rather than trying to watch the max readouts on the big number display. Interestingly enough it showed on the graphs that my d/c was reading about 75-85% at WOT up to 7k... I'm thinking this is more accurate, however I don't understand how looking at it in that mode would make such a huge difference. Maybe those loggers are flawed when they added the large number displays....
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02-12-2004
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#12
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Hellbound
Join Date: Nov 2003
Location: St Paul
Posts: 1,390
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What were your pulse widths at that RPM?
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-Nulli Secundus-
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02-12-2004
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#13
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Join Date: Oct 2003
Location: White Bear Lake
Posts: 109
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Looking back at the logs it seemed pretty consistant that I had a p/w of 14.5ms at 6500rpm. That translates to nearly 80% by one of those conversion tables, which is also close to what it reads for the d/c when I change it to that option. I was just getting the 100% when looking at the large number display the other day and not actually logging....
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02-14-2004
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#14
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Captain J-Sack
Join Date: Oct 2003
Location: Chicago, IL
Posts: 594
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im pulling the same duty that ecoli said at 40psi base fuel pressure. my first gear had a higher % around the 100s while 2nd and 3rd had lower around in the low 90s or some crap
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