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  • Users: pickler
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  1. pickler

    Catalytic meltdown

    How lean is too lean for a modern (non-lean burn) car and how rich is too rich? Reason I'm asking is my new 4 cylinder Mazda 3 is going through catalytic converters like shit through goose. The dealer has been unable to solve this problem. Looking at the fuel mixture and its ECU, Its WOT fuel...
  2. pickler

    Atkinson Cycle using VVT control unit

    I would like to create an Atkinson cycle like behavior for my VVT (both intake and exhaust) enabled 6 cylinder 3.6L Subaru engine. Currently the VVT settings are as such under loads experienced cruising @65mph. advertised Intake duration 244* ivo 15* btdc ivc 49* abdc intake cam can be advanced...
  3. pickler

    VVT tuning

    A 2013 Subaru Legacy 3.6 (H6) i'm tuning has dual VVT or Dual AVCS as subaru calls it. I can control both intake and exhaust timing (50*/40*) respectively. The cam specs seem to be very mild even though the car has no problem building torque up to 5200 RPM and power peaks at 6000 rpm at 260ps...
  4. pickler

    reduced valve lift and early inlet valve closure

    I have been messing around with my Subarus ECU for quite a while now. i have made some improvements in ignition timing and AFR which has made it both responsive and slightly more fuel efficient. For example I advanced part throttle ignition timing by about 3-8*. recently i learned about its...
  5. pickler

    does retarding ignition timing reduce cylinder head temprature

    Was just wondering if one retards timing from 15* btdc to 4* does this increase cylinder head temps? I know exhaust gas temps go up but I think that's because of part of the combustion escaping the chamber due to lack of burn duration? Not necessarily because the engine is running hotter. I have...
  6. pickler

    best throttle setting for fuel economy

    I have the option to alter my throttle setting on my Subaru. there are 3 different settings: - economy - sport - SportSharp I personally do not see any difference between economy and sport...i think in eco it just keeps the torque converter locked longer before unlocking but i'm not sure...
  7. pickler

    Air Fuel Ratios for NA Engines

    I'm used to seeing naturally aspirated cars run rich. by rich I mean around 12.5 parts air vs fuel ratio at any given RPM almost. So i'm wondering for the engine I built, is the following table suitable? Engine is a street flat 4, 4 valve, high tumble/swirl NA with 10:1 static and 8.5:1 dynamic...
  8. pickler

    Ideal AFR theory (modern 4cyl engines)

    In tuning modern compact high compression NA engines, i have always had trouble dealing with knock/detonation under wide open thorttle. it seems these cars can exceed Minimum Best Timing for torque without knock under partial throttle but nearing full throttle they start to knock severely far...
  9. pickler

    ethanol free gas - worth the extra money?

    Gas station sells ethanol free 91 octane for 15% more money compared to E10 87 octane. is it worth the extra money if my car is fine with regular gas? I read somewhere that E10 gas causes up to 5% loss in fuel economy and damage to seals and gaskets.
  10. pickler

    engine knock under heavy load and low RPMs

    I have an 09 impreza with a naturaly aspirated stock 2.5l SOHC engine with 10:1 compression. Engine is rated at 170hp at 6000rpm and requires only regular 87 octane. I have been noticing hesitations with this engine at around 2500 rpm under load. After some data logging i noticed severe knock...
  11. pickler

    estimate BSFC sweetspot for partial load

    I have a naturally aspirated 2.5L boxer 4-cylinder engine. I would like to estimate brake specific fuel consumption sweetspot for my engine at partial load (say +50% based on MAP readings). I do have a chassis dyno curve which i thought some one could use here to help estimate BSFC from...

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