Or.............you could just install my water injection system. Cures all those problems. therealdmcvegas <dmcvegas@xxxxxxxxx> wrote: I's a good question. Why hasn't anyone picked up on the design? Could be because of royalties, time involved in configuring (minimal as you'll see), or something else? U.S. Patent #: 4,336,688 Bias Boost Control System In a nutshell, Legend designed a Variable Boost system of sorts by utilizing the wastegates, rather than Variable Geometry adjustable vanes or secondary turbos like you see on most engines. Turbo lag slows down a car off the line, because you need to spool those turbo chargers up to build compression in the combustion chambers. High Compression turbos spool quickly, and are usually not suited for an engine's entire power-band. They'll deliver too much boost at higher RPMs, and can cause pre-detonation, engine damage, etc. Because after all, as engine RPM's increase, so does the boost pressure. How to fix: There's a number of ways to avoid engine damage, but unfortunately, you have to sacrifice bottom-end performance to stabilize the top-end. ->Reduce Compression (reduces fuel burn efficiency, and further hinders spool-up) ->Install 2nd turbo charger with different geometry/lower compression to feed engine when primary turbo is bypassed (EXPENSIVE and complicated, plus adds weight takes up space in engine compartment) ->Use a Variable Geometry Turbo (Rotating vanes coke up way to easily, although stationary vanes that slide rather than rotate are self-cleaning. But only hit the market for diesel trucks within the past few years) Now, here's your final option, and that is Bias Boost Control. By measuring the gas pressures inside the Intake and Exhaust manifolds, you can trigger the wastegates to slowly open as the RPMs increase, and thus slowly reduce boost pressure as RPMs increase as well and avoid engine damage. Plus with an EGR valve, it can reduce engine knock, and help prematurely raise the Intake manifold's pressure when it falls below that of the exhaust manifold, thus reducing spool-up times even further. Problem solved. Bonus: 1. As you get to those higher cruising speeds, boost is reduced, and fuel consumption decreases. But, since it's constantly monitoring both manifold pressures, it can also quickly close that wastegate to give a sudden boost in in case you suddenly need some passing power at high speeds, and of course it decreases back down too. Plus with a constant feedback from the engine's pressures, you could probably avoid engine detonation without any knock sensors. 2. Since the turbos let off and balance out as the manifold pressures stabilize, less fuel is of course consumed. So we get not only improved gas mileage, but better emissions (lower HCs, and NOX). It's a purely mechanical system, with quick adaptation to electronic controls if nessisary. Plus since it bolts right on, yet maintains it's own control systems that need not intergrate into existing engine controls, it was perfect for the DeLorean. Both from the car's drivetrain standpoint, as well as how simply it could have been bolted onto crate engines, and thus cars with no major upsets to the production lines at the factory. So now, here's your answer: Why haven't any other production cars used this design? On that, your guess is as good as mine. Politics? Royalty costs? After all, this isn't just like a turbo charger concept, or even a variable geometry concept which cover just one component. It's an entire control system that's patented, and wouldn't work without every covered component/theory involved. And as you can see, that patent coveres quite a few things. Why are there no ready-made kits for the DeLorean? Probably a little of the above, and the fact that there are certain variables that are unknown. There are reducing valves, and spring-loaded valves that connect the wastegate actuator up to the Intake and Exhaust manifolds. And what those values are, I have no idea. Now I'm sure that over the years there have been a few people within the marquee that have known how this system works. But up until I found that layout on the U.S. Patent Offices website, it was a mystery to me. So perhaps lack of knowlege could have been another reason as well. Later on down the road in a few years, I plan on trying to duplicate this set up on my car. I've already got 2 IHI RHB-5's with water-cooled ports on 'em ready to go. I've just got to figure out what the values for those ports are... -Robert vin 6585 "X" --- In dmcnews@xxxxxxxxxxxxxxx, "ronkhanna" <ron.k@...> wrote: > > > Hello All, > > I happened to come across an old Road and Track Article on Tamir's site > regarding Legend Industrie's development of a turbo version of the > Delorean. In that article, the author mentioned he was able to test- > drive the prototype. I'm curious to know why there is no aftermarket > turbo version based on the successful work of Legend Industries. Any > ideas? > > Oh, and it's my first post, so please be gentle. ;) > > Cheers, > > Ron K. > Oakville, ON > Chris 06301 Find me on Google Earth 45°43'03.24"N 123°53'45.81"W --------------------------------- Park yourself in front of a world of choices in alternative vehicles. Visit the Yahoo! Auto Green Center. [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! 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