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Old 6 Dec 2017, 10:37 (Ref:3785395)   #76
knighty
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knighty should be qualifying in the top 5 on the gridknighty should be qualifying in the top 5 on the grid
I have to say, after seeing the monstrosity of twin-turbo exhaust systems on both the AER-BR-Dallara and the Nissan-Kolles cars......the single central turbo Ginetta will look awfully more sleek in comparison........much like the audi-Diesel was, the side pod exit was much clearer of clutter.

The Kolles in particular almost blocks off the entire side-pod outlet with turbos,pipes and wastegates.......I believe the side-pod exit helps drive the aero of the rear diffuser.......hardly a small consideration in the aero department.
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Old 6 Dec 2017, 14:21 (Ref:3785429)   #77
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We have to remember that the Peugeot 908 V12 had side exit exhaust and so did the Porsche RS Spyder, Acura ARX-02 and the Acrua/HPD ARX-01c. I know that's years ago, but it didn't seem to harm those vehicles performance.

Not to mention that the Pug had particle filters and the Porsche and Acura/HPD cars mentioned had mufflers in the sidepods. I'd think that a bigger issue would be heat from the exhaust messing with tire pressures
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Old 6 Dec 2017, 18:18 (Ref:3785487)   #78
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https://mobile.twitter.com/vitalypet...60885139558400

I do enjoy some popping and banging
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Old 6 Dec 2017, 18:38 (Ref:3785494)   #79
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https://mobile.twitter.com/vitalypet...60885139558400

I do enjoy some popping and banging
The sound is good indeed!
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Old 7 Dec 2017, 07:06 (Ref:3785596)   #80
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Motorsport.com has some images from testing!
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Old 7 Dec 2017, 09:01 (Ref:3785608)   #81
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knighty should be qualifying in the top 5 on the gridknighty should be qualifying in the top 5 on the grid
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https://mobile.twitter.com/vitalypet...60885139558400

I do enjoy some popping and banging
I believe this is possibly part of the anti-lag strategy (ALS) to keep the engine boost pressure up to a drivable level, whereby some extra fuel is injected when off-throttle, it ignites when it touches the hot exhaust manifold and causes a series of bangs through the exhaust turbine to keep it spinning for constant boost.

over-fuelling is generally frowned upon in endurance racing as you are otherwise wasting precious fuel......they possibly also have a fresh-air valve system to help air bypass the engine and go straight into the exhaust to help keep boost pressure up.

It was an ALS system pioneered in the early days of Turbo F1 cars in the 1980's, and then exploited further in WRC in the 1990's.......but the bangs were on another level.
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Old 7 Dec 2017, 09:04 (Ref:3785609)   #82
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I believe this is possibly part of the anti-lag strategy (ALS) to keep the engine boost pressure up to a drivable level, whereby some extra fuel is injected when off-throttle, it ignites when it touches the hot exhaust manifold and causes a series of bangs through the exhaust turbine to keep it spinning for constant boost.

over-fuelling is generally frowned upon in endurance racing as you are otherwise wasting precious fuel......they possibly also have a fresh-air valve system to help air bypass the engine and go straight into the exhaust to help keep boost pressure up.

It was an ALS system pioneered in the early days of Turbo F1 cars in the 1980's, and then exploited further in WRC in the 1990's.......but the bangs were on another level.
Is the air valve bypass the system that Ford use in the GT? Seem to remember something about that. It is a funny sounding thing on the over run.
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Old 7 Dec 2017, 15:15 (Ref:3785666)   #83
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knighty should be qualifying in the top 5 on the gridknighty should be qualifying in the top 5 on the grid
quite possibly........its common in motorsport as an ALS system for any turbo motor......its commonly mistaken for an EGR valve, but its completely the opposite.

I think the Ford 1.0 3-cylinder tubo eco-boost motor actually uses one in mass production.
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