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Recent content by CDC

  1. CDC

    Programmable Ignition Curve

    Look at the powercommander from dynojet.com or powercommander.com It is a 3D mappable fuel and ignition intercepter piggyback for high rpm motor cycles.
  2. CDC

    Mass Flow Meter and EGR Valve

    Read the technical articles about those sensors on autoshop101.com The info there is good and easy to understand.
  3. CDC

    O2 sensor wiring

    On my 96 Impala SS the colors are tan, signal low. Purple, O2 signal. Pink, 12V supply for heating element from underhood electrical center. Black, ground for heater circuit. Your's is most likely like Patdaly already suggests. To understand what you are going to measure read, for instance...
  4. CDC

    Header Wrap

    My theory is that those claims may be based on thruth, if you're lucky, like with many miracle solutions(!). I suppose that if you do not cool the gases on the way to the next join, they have more volume (more heat is more volume). Thus the timing and duration of a gas pulse that aids...
  5. CDC

    Support chips for Bosch LSU4 O2 sensor

    Checked the price with the VW dealer, 154 Euros(!). Saw the best price on the net in the USA for $28.99 (!) What a rip-off. Unfortunately it isn't worth buying it there if you only need 2 or so.
  6. CDC

    EGR Exhaust Gas Temps

    Docengineheat You're right, I misread that, probably because we express economy here in liters per 100 km, so if the number lowers then economy improves, stupid mistake of me. The Bosch book on Diesel engine Management draws a curve of fuel consumption that decreases, may it be minimally (1%)at...
  7. CDC

    Fuel Temperature

    From my point of view these trials can create the wrong impression if there are no other changes made to the system. It is a bit like the story with the special spark plug cables being superior to OEM cables, ignition coils with more power, sparkplugs with more or less gap, different materials...
  8. CDC

    EGR Exhaust Gas Temps

    Well, if you read this long term test report then it appears that EGR can improve mileage: http://fleetowner.com/ar/fleet_bowman_reports_egr/ It seems that the only thing that is certain is that the NOx is reduced, if that compensates the increase in particle count and ppm HC will have to be...
  9. CDC

    Engineering dept staffed with unqualified "engrs"

    As an 'ex' senior engineer/manager for a reasonably sized ship repair company and over 30 years of working experience I would like to comment that ISO 9001 has nothing to do with engineers, a company without engineers can also be ISO 9001 accredited, in theory even a one man company can. It has...
  10. CDC

    I am in the process of investigatin

    Gentech, Looking at some catalogs on belt drives I wouldn't jump to conclusions based on the above at this stage. You may just have the wrong belt spec. with regards to type of reinforcement. I would contact people like gates.com and let them ask the right questions and see what they can come...
  11. CDC

    I am in the process of investigatin

    Another point to think about. If the unit gets started often and if the generator starts running up to operational rpm directly, as some do, then there might be a lot more torque than the belts are calculated for during the startup. In this case maybe you should try V belts instead allowing for...
  12. CDC

    EGR Exhaust Gas Temps

    Note that the pumping losses apply only to gasoline engines as diesels do not have throttle valves.
  13. CDC

    EGR Exhaust Gas Temps

    There is an article of 1997 on this subject on http://www.damek.kth.se/~borje/Artiklar/SAE%20982476.pdf For normally aspirated engines the temperature story also follows those lines, nevertheless EGR is not normally used at WOT when the temperatures are usually at their highest. EGR is also...
  14. CDC

    Chip-tuning and Oxygen sensor (Lambda sensor)

    Zimbali, I believe we are straying from the original question: chiptuning, which I would prefer to call re-programming of ignition and a/f ratios, in the closed loop area and beyond, how it works and what results to expect. I believe the question has been answered. Yes, in general NOx...
  15. CDC

    Chip-tuning and Oxygen sensor (Lambda sensor)

    About Cat temperatures and A/F ratio. Well, I thought this was an engineering forum.. For information directly available on the web read http://www.randomtechnology.com/technical.html For other, even more authoritive, publicized info about his subject read for instance 'Gasoline Engine...
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