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Keyan

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Posts posted by Keyan

  1. If the turbo still has a good amount of heat in it some boling is a normal part of this process.

     

    incorrect, coolant when boiled is a vapor and heat can not transfer as well when its in vapor form as compared to liquid. boiling coolant is never a normal part of the process. that is why the rad caps apply pressure to the coolant system. higher pressure means a higher boiling point and if you can keep it a liquid then it actually transfers the heat properly.

  2. i dont see what the big deal is that the dealer said the car would need a turbo during a PRE-PURCHASE inspection.

     

    the mechanic is covering his ass by telling you its leaking. it may not be a crazy leak but you also didnt pay to have the mechanic take it apart and identify the exact failure component.

     

    plus, it is to your benefit to have a mechanic say the car needs a 3400 dollar repair. you get that to negotiate the price lower, where then as an educated car guy can fix it for much cheaper than the mechanic said.

     

    sounds win win to me.

  3. id guess you either took your measurements wrong, or the valve seats in the head are pushed in causing the valve stems to sit closer to the cams.

     

     

    machine shops can grind the tips of the valves to get you in to spec but i recommend figuring out why the valves are sitting too close first. you don't want to put a band-aid on a broken arm, if you take my meaning.

  4. seeing a little bit of feedback knock is fine, it could be something as simple as something rattling around in the engine bay.

     

    knock is only super dangerous during heavy throttle.

     

    if your ecu doesnt have any Fine Knock Learn and your DAM is still at 1.0 than I wouldn't worry about it.

     

    feedback knock is sudden, temporary timing retard due to a random knock event

    fine knock learn is when the computer sees feedback knock in the same load/rpm range over and over that it will throw in some fine knock learn to "permanently" pull the timing in that range

    DAM is a full timing pull that starts at 0.75 when you reset the ECU - goes to 1.0 when the ecu deems everything okay - and pulls it back down below 1.0 if it finds something really wrong.

  5. ethanol is bad in small engines that can't adjust AFR on the fly such as lawn mowers and weed wackers.

     

    if you inject 10ml of gasoline, and you have 10% eth, you're actually injecting 9ml of gas and 1ml of eth. this affects the air fuel mixture which makes small engines (that are usually carburated) not run at their full potential.

     

    cars that have AF sensors (all of them, basically) can adjust the fuel injection amount to compensate and keep the 14.7 for optimal performance.

  6. price varies from dealership to dealership because some go above and beyond the recommend servicing items and package in other things that aren't necessarily a bad idea.

     

    dealers are franchises and can price it however they want.

     

     

    there is nothing specific to be done at 30k other than oil, rotate, cabin filter and engine filter. brake fluid is also good idea; subaru recommends it replaced every 45k.

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