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Old 12-27-2005, 06:15 PM   #10
CBFryman
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Re: Re: Re: engine running without exhaust

Quote:
Originally Posted by Black Lotus
Nope, nope, nope. And nobody cares about diesels anyway.
It's true that Billy-Bob can slap a turbo on Bobby-Sue's Mustang and possibly get results that might make him happy without ever removing the manifolds. But on OEM cars and professional racing applications, they spend time getting the inlet and exhaust manifolding correct for off-boost, transition, and boost conditions. Obviously you have to get it a lot more correct if your engine is putting out 1,000 HP from a 1.5L engine, compared to 350 HP on a 5.0L (Bobby-Sue's) engine. The penalty for getting this wrong in both instances is bad drivability and/or a blown engine.
Curtis was refering to pre turbo intake. Also, the number of 1.5l engines produceing 1000hp (either at teh wheels or crank) is slim, very slim, slimmer than an anerexic etheopian child (one ticket to hell please).

diesels are an entirely different monstor from gasoline engines as well. Where gasoline engines are limited by boost because running lean causes knocking in many cases diesles have no ignition and always run lean (a diesle running rich just needs more boost). basically, making power with diesles is baby's work. as long as you have the internals to handle it, a bottom end that can take it, cooling system that can cool it, oil system that can keep it lubed, and heads that can hold the pressure...
All you need to do is up boost, then up fule, in a continuous cycle untill one of the limiting facots above is reached.
Sure some tuning can make more power on a given set up, however when talking about boosted air doesnt get inertia. Boost is nothing more than air which has nowhere to flow. once the piston is near BDC and pressure is equal on both sides of the valve...no more air is going into that cylender. so intake runner length is just more space for the turbo to have to full with extra air.
However, intake runner length is needed to be tuned to get the engine into a range where it will go on boost. gasiline engines are the ones that really have to worry about this.
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