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Thread: 2 Queries ...

  1. #1
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    Default 2 Queries ...

    As the Topic says .. i ve 2 queries ..

    1) How good a Jap. ALTO is ? and wats its fuel average on PETROL.
    2) Does removing Cat.Converter(middle wali dholki) increases the mileage or decreases it ?

    Waiting for kind response from my fellow wheelers...

    RegZz,
    Shaiz Khan !

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    959
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    Default

    Sir

    Alto is a good car, if you can afford it and maintain it, you can get power everything plus AUTO.

    The official average of Alto is 17-25 Km /liter CITY /Hwy, and it achieves that practically.

    If you are using a refined petrol like 89 RON or regular like Caltex Techron, you should keep the CAT converter.

    Otherwise if fuel quality is not good in your area you have to clean it after every 2-3 months or remove it because it will be clogged soon with impurities.

    You can also use high Octane, if regular petrol is not good.

    Regards
    Readers are Leaders.

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    Default

    thnx for the reply broda.....any more suggestion ??
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    Default

    plzz do mention that free flow increases or decreases mileage ?
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    Default

    the cat is infact a constraint to the air flow especially if its clogged due to crappy fuel.. removing it will improve milage i guess

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    Default

    which jap alto are you referring to?
    -

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    959
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    Default

    Sir

    Free flow exhaust will always increase power and decrease fuel economy in any car.

    Also, a free flow should be balanced by a high performance intake.

    On CNG, both of these things are highly not recommended.

    Regards
    Readers are Leaders.

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    Default

    Mehran Rox!
    Baat karo haq ki, chahay hatt jaye sabki

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    Default

    Quote Originally Posted by 959 View Post
    Sir

    Free flow exhaust will always increase power and decrease fuel economy in any car.

    Also, a free flow should be balanced by a high performance intake.

    On CNG, both of these things are highly not recommended.

    Regards
    These statements are NOT correct.

    Free flowing exhaust reduces back-pressure, yes, but it may or may not result in increased power and decreased fuel efficiency.

    Modern engines have careful tuning of the exhaust headers to set up shock wave resonances to aid extraction of exhaust gases, and thus help efficiency. A cat-back system can help a little bit, but usually just makes more noise.

    The tuning and performance of the exhaust is independent of the tuning of the intake tract in road going engines. Only in race car engines with a large valve timing overlap are these inter-connected to push unburnt fuel across the piston top to cool it off with both exhaust and intake valves open as part of the combustion cycle.

    Changing both together can help with airflow across the engine, but the real gains come only when the fuel:air and timing maps are revised to take advantage of the increased airflow made possible by the new intake and exhaust.

    Most after market systems are not very well engineered to take advantage of all these variables.

    If properly engineered, these improvements will work just as well or badly with CNG as they will with petrol.

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    Default

    @ 959 : thnx alot for helping sir...i really appreciate dat
    @ illdude : m refering to the same shape that is produced in PS aswell
    @ Yawar : kch kehna chah raho ho beta app ?
    @ Vcheng : that was a really really nice info......(if it was a little less technical .. my bad )
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  11. #11
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    Default

    deres still a little confuxion in my mind....
    1)FREE FLOW INCREASES CONSUMPTION : Becux of more air/fuel burning
    2)FREE FLOW DECREASES CONSUMPTION : Becux of better flow of exhuast gasses as said by RB : "the cat is infact a constraint to the air flow especially if its clogged due to crappy fuel.. removing it will improve milage i guess "

    so wats the real thing ???
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  12. #12
    959
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    Default

    @khanji_143

    Sir Pakistan shape Alto was discontinued in 2002, I recommend you go for the 6th gen HA24 Alto, if you are going with Japanese one.

    Also please check that weather your car has optional ABS, Airbags (driver and/or passenger) or not, because apart of them, there is very little charm in a HA12 Alto.


    @VCheng

    Sir

    That were very good principals, not practical though.

    "Free flowing exhaust reduces back-pressure, yes, but it may or may not result in increased power and decreased fuel efficiency"

    If they do not increase power or power curve then what is their purpose, Decoration or Sound?

    Every free flow exhaust will increase power in HP, if implemented properly.

    Now practically he will mess up his CAT converter and Oxygen senor both if he will try to do something with his Exhaust, especially on CNG.

    Aftermarket Free flows are not recommended even by sports car manufacturers, unless they are done by approved tuners, let alone a Suzuki Kei car.

    CNG needs a near perfect Air/Fuel Ratio, (especially in 1.5 Litres + cars), that is why mechanics block the air intake.

    Now if the intake is factory fitted manifold and Exhaust is free flow, that is not good for both power and fuel efficiency, in other case, if he will install both a high performance air intake and free flow exhaust, he will also have to go for a richer air to fuel mix.

    That will definitely increase the fuel consumption, weather he will be using any type of fuel.

    The tuning of both intake and free flow on CNG is impossible.

    Nearly all Ferrari cars since 550 Maranello uses variable back pressure exhaust, just to increase power and fuel economy is not the concern.

    Regards
    Readers are Leaders.

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