Well, there's a big difference between a seminar and the real world... Look at Cummins or Caterpillar -- I don't think they make a single diesel engine that way.

Other BNR owners have had no problems with hitting high levels of boost on the primary. I have never seen a fully working set of BNRs out of 4 or 5 sets. I think you need to have Bryan redo them or give you your money back.

 

You're not comparing apples to apples. There is no common ground shared between our FD twin-turbo sequential set-up and any given turbocharged diesel engine. Turbo-Diesel'd motors are engineered to produce enormous low-end torgue and are usually used in conjunction with multi-geared transmissions in vehicle's containing low rear-end gears. All the HP and Torque is generated at low RPM/power range. Not made for speed,...but made to move huge vehicles. Plus, turbos made for diesel applications are typically at least twice the size of our Hitachi TT's.

It's just a totally different application.

 

actually, I saw the show Trucks the other weekend and they used the dual system as their example Diesel engine, so it must not be that uncommon. On the other hand, I'm not a Diesel mechanic nor a truck driver so I have no idea how common they really are. All I know is that I've heard it mentioned a few times which was enough to make me think it was common practice on commercial engine diesels.

 

Being "mentioned" in some diesel engine tech seminars hardly qualifies as "common practice". There are no mass-produced diesel-powered automobiles that use a SC/TC in series that I know of. Plus, these are diesel engines; hardly the same as a gasoline-fueled engine.

 

Actually they just use big superchargers and lots of Nitromethane!
Art

 

sounds like a reasonable idea overall but i wonder how hot the air would be after being compressed by the 2nd turbo. it is likely this increase in primary turbo intake temperature could negate the added pressure of the intake charge. of course, since the stock intake system does dump this into the stock airbox it makes you wonder i think we need some real world testing with a couple of boost and temperature gauges.

 

Actually, there shouldn't really be any heat added since it's compression of gas is an isotropic process. That means it heats up when you compress it, and cools back down when it depressurizes. Compressing it twice should give you the same ammount of heat as doing it once, given the same final pressure.

I'm going to give it a try and see what happens, but it probably won't be super soon since it means taking the pipe out, doing some metal fabrication, and having someone weld it up for me. Just wanted to see if there was something obvious I was overlooking before I did this.