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Thread: BANG bang

  1. 30th May 2009, 07:46 AM #1
    Pedro_The_Swift's Avatar
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    BANG bang

    I was interested enough to drive from Toowoomba (6am on a saturday) to Nambour (9am kick off) to see the Asia Pacific rally cars run around the Nambour Showgrounds in a short Time Trial, media event, top ten shootout type thing.

    The only interesting thing I found, (other than our guys **** on asia pacific cars) is the total lack of revs from the modern turbo evo 4wd rally car.

    talk about short shift!!!

    I reckon about two thousand revs is all they get to play with,, from 3 to 5?

    and backfire?!?!?!?!
    you have no idea,, a moments hesitation and BANG!
    some of them didnt require that! every single lift of the right foot and BANG!
    and not just a single BANG!,
    BANG! BANG! BANG! BANG!
    untill the lower gear is pulled,,
    unbelievable.

    every single asia pacific car ran like this,,,

    waste of good turbo's I reckon
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  2. 30th May 2009, 08:30 AM #2
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    I think you'll find that's the antilag that they fit to the turbo cars Pedro. Between gears they burn fuel in the exhaust manifold to maintain gas flow through the exhaust and hence keep boost pressure up. At least that's my understanding from a mate of mine who has prepped some Asia-Pac Subarus.

    [ame="http://www.youtube.com/watch?v=jCCitX0q59k"]YouTube - Subaru STi Antilag[/ame]
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  3. 30th May 2009, 05:02 PM #3
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    Anti-lag sounds amazing coming thru the forest towards you! You are correct that it's to keep the turbo spinning at full speed whilst off throttle, but it's also switchable so they can turn it off while on a transport stage or similar.
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  4. 2nd June 2009, 02:55 PM #4
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    Indeed, Paul is correct.

    If I recall correctly, as soon as they back off, the computer stops the engine firing on one cylinder, so the fuel burns in the turbo instead, making it work somewhat like a jet turbine, and stays spooled up so boost is always there. This is much easier than the old method of accelerating and braking at the same time...

    The short rev range may be for the same reason???

    Pedro - any pics/vids???
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  5. 2nd June 2009, 04:31 PM #5
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    Sorry Ben

    just out of curiosity---

    can everyone else HEAR that vid??
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  6. 2nd June 2009, 04:54 PM #6
    d@rk51d3 Guest
    Quote Originally Posted by Pedro_The_Swift View Post
    Sorry Ben

    just out of curiosity---

    can everyone else HEAR that vid??

    Loud and clear.
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  7. 2nd June 2009, 06:31 PM #7
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    What a waste of fuel. The prob is I wonder how much advantage that would give the average Joe driver! Its like motorbikes, they manhufacturers come out with ever increasing lighter bikes to have the 'advantage', but what advantage when a lot of riders are overweight or can never use the full potential of the bike anyway.
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  8. 2nd June 2009, 07:03 PM #8
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    Quote Originally Posted by stooge View Post
    What a waste of fuel. The prob is I wonder how much advantage that would give the average Joe driver!
    <snip>
    But they aren't your average cars ! ?

    It's motorsport, where you do whatever to give your blokes an advantage (within the rules, of course )
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  9. 2nd June 2009, 07:09 PM #9
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    Aren't the latest crop of WRC and AP rally cars inlet restricted ?
    If they still are, it really drops the torque band down to where mere mortals tend to drive.
    The same thing happened in F3 years ago with the inlet restrictors.
    IIRC a Formula Ford out revs an F3 car, you short shift the wings and slicks car and use the torque. I think they just stopped revving at about 5500

    Anyone old enough to remember when Toyota had a moveable sleeve to by-pass the restrictor on the WRC Celicas ?
    Talk about sprung big time
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  10. 2nd June 2009, 07:47 PM #10
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    Love the sound of a car machine gunning through the forest : ))
    '
    Pedro, as a result of the spectacular loss of life during the 'Group B' days of rallying, FIA decide that it was easier to limit the power of the cars rather than limit the poor crowd control that allowed too many people too close to the action.
    The format went to 'Group A' based on real cars and a drastic cut in power. The focus went to suspension, tyres and TORQUE.
    Cars are now required to have a 32mm (yes 32mm!) restrictor up from the turbo. As a result greater airflow results in more inlet turbulence/ reversion etc.
    That said, the current crop of ~280kW WRCars have far better stage times than the 550kW Gruppe B monsters.

    mmm, Time to watch 'Too fast to race' again

    Dave.
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