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  1. mattsooty

    fuel tank over pressure

    Gasoline Automotive applications continually & freely vent any tank overpressure through a carbon filled scrubber canister, without a 'shut off valve' (except when used for tank leak diagnosis). This means Ptank = Pambient and, all the while the canister can hold fuel vapour, there is no HC...
  2. mattsooty

    I need help reading ecu pin on Bosch Motronic ME7.1.1.

    I'm not 100% sure what you are asking but VAGCOM is most likely what you need. ms
  3. mattsooty

    How fuel mixture is supplied while clutch alone is released and not accelerator pedal is not pressed

    In a modern gasoline engine, in the condition you describe. With 0% Pedal you are in idle speed control, whereby instead of a desired torque by the driver a desired engine speed is maintained, by a varying torque. The torque is split into two parts - slow (air) & fast (spark) whilst lambda=1...
  4. mattsooty

    estimate BSFC sweetspot for partial load

    Pickler, I'm not sure if I am missing something but BSFC is not generally measured transienttly. It is a figure that is quoted from steady state testing and involves the use of fuel weighers of some other means of accurately measuring fuel consumption. I think that I know what you are trying...
  5. mattsooty

    Bon voyage Pat Primmer

    What dreadful news, I have never met Pat - in fact I know very little about the man yet, having been a member of this forum since 2001 I have 'known' him for a long while. Very knowledgeable & wise chap who will be missed. Thanks rmw for informing us. Sleep well Pat & this forum just wont be...
  6. mattsooty

    Starter fuels for a diesel engine

    Correctly calibrated Ether Assisted Start can & will start a CR DI Diesel engine to temps lower than the lowest recorded ambient on Earth - However, as Pat correctly points out the scope for damage on an incorrectly calibrated start is pretty spectacular. However, if it were my engine I would...
  7. mattsooty

    Starter fuels for a diesel engine

    Correctly calibrated Ether Assisted Start can & will start a CR DI Diesel engine to temps lower than the lowest recorded ambient on Earth - However, as Pat correctly points out the scope for damage on an incorrectly calibrated start is pretty spectacular. However, if it were my engine I would...
  8. mattsooty

    Back pressure question for fixed RPM engine

    If it is downstream of the muffler it is unlikely to have an appreciable downside. MS
  9. mattsooty

    No-load engine testing

    Interesting point Steve, I wouldn't have thought of NVH working their black art in this sort of condition. I guess a motored dyno would be better? Even still, a helmet is only going to save so much...... Another thing for me is that, bar a few exceptions, gasoline engines only have a low idle...
  10. mattsooty

    No-load engine testing

    Testing at 'no load' conditions makes absolutely no sense to me. Even when doing work at idle PAS/AC/Generator loading rigs are used, to give representative conditions ie zero clutch torque with significant accessory loads. If you decide to continue you really must ensure that...
  11. mattsooty

    O2 Sensor

    Hypnotist It really depends on what you are trying to measure? A standard Binary Sensor (Heated Exhaust Gas Oxygen Sensor) will tell you if you are Rich/Lean of stoich by the voltage it flows and if this is sufficient you could make something very cheaply. Whereas a Wideband Universal HEGO...
  12. mattsooty

    Seeking the true definition of fuel injector latency

    Gordon, I think that Tony has it covered but, in a nutshell: - The 'Effective Injection Pulsewidth' is the time that the injector is held open, during which fuel flows at the static flow rate at that condition [F=(dp over injector tip, rated flowrate of injector)] As the injector driver goes...
  13. mattsooty

    Lotus going down the tubes?

    It's a small world! As far I know Malcolm is still a Big Cheese on the engine side with Jaguar, don't know about Ralph but heard he went to Caterham. Both very clever guys but polar opposites on the 'driven' front! MS
  14. mattsooty

    Lotus going down the tubes?

    My experiecne of Lotus (both Cars & Engineering) where back in the days of Malcolm Sandford, Gary Reid, Rupert Bailey etc. Some very, very clever guys that seemed to run matters well but were almost starved of anything exciting & profitable to. From a powertrain point of view, Engineering had...
  15. mattsooty

    Diesel fuel possibilities

    Just a quick refresh of the main fundamental difference between a gasoline SI engine and a diesel CI engine which is, quite obviously, the combustion process. Within an SI engine, operating under normal conditions, the sequence is: - Mixture Formation - Combustion Initiation - Kernel Formation...
  16. mattsooty

    Stop/Start engines and turbocharger life

    SomptingGuy Are you referring to the 4,0l V8 TFSI Engine? From what I understand this doesn't have 'bank deactivation' per se but individual cylinder deacivation, missing every other cylinder in the firing order and deactivating both inlet & exhaust valves on those cylinders. So 2 cylinders are...
  17. mattsooty

    Data Acquisition System

    Industry standard Dev. Aid is INCA, as made by ETAS - many solutions available but expect to pay big money. MS
  18. mattsooty

    Power lossses in air intake

    48cmPiston Do you know if, for the engines in question, the boost pressure/mass airflow is under closed loop control (via a wastegated etc) turbocharger? If they are then I would not worry too much about inlet restrictions, unless it is efficiency you are looking for or you are close to the...
  19. mattsooty

    Diesel fuel possibilities

    Fair one Pat, and I hope you didn't think I was being patronising. My understanding is that, as a combustion system, heterogeneous charge compression ignition engines are still very much pigeon holded & are yet to break into the performance game proper - hence a lack of literature. Ms
  20. mattsooty

    Diesel fuel possibilities

    It's not quite as easy as that with CI engines Pat; a fuel with a high calorific value may still be sub optimal, if you cannot get all of it burnt in the right window - hence the requirement of a high cetane number, without which you end up with high exhaust temps & loads of smoke. However, the...

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