Just tap the turbo housing for an air line in the right spot, and get you a tank, and compressor. Have it when you hold a button in the cab, it shoots air into the housing in the correct direction to keep the turbo spooled. It may sound dumb, but since we are on the subject, and i just felt like thinking a little. I cant think of why it wouldnt work, unless you coudnt put enough air into it?

Eric

 

Or maybe you could use a blow off valve that blows off all of the pressure on command and use a little electric motor to spin the turbine?

 

You could use a blow off valve venting boost into a separate combustion chamber where you inject some fuel, pipe the exhaust from this contraption into the exhaust after the exhaust brake but before the turbo and if it doesn't explode you have an aircraft style APU for compressed air.
The idea of tapping in soma compressed air is a bit tricky due to temperature difference and only getting the air to a small section of the hot turbine.

AlpineRAM

 

more trouble than its worth.

Just drop a gear, keep your revs up and use compression braking.
The engine is spinning fast so its displacing alot of air and spinning the turbo. Since the engine doesn't have fuel, its trying to slow down and thus is creating drag on your rear tires.

Oh wait, racers already do this.

 

Something you could do was to supply extra fuel into the exhaust pre-turbo under low load conditions. There is excess oxygen in the exhaust for the fuel to burn and it will give you volume and temperature to spool the turbo. (Diesel should need a glowplug or the like to ignite)

If you try this do not blame me for exploding parts etc

AlpineRAM

 

Well, last time you guys said I would explode I made it out alright...

So we need a sparkplug in the exhaust manifold... Hmm, I'll get on that...


(You have a pretty good grasp on the theory of operation on Diesel engines, don't you Markus? Is that from an "official" education somewhere?)

 

Well, I sport some formal training- vehicle builder for racecars for some years, some ran in diesel cups (popular over here) still working on some of them when time permits
I was responsible for the powertrain development of some racecars. Had my nose into drivetrain-suspensions too, got distracted by teh possibilities in the computer sector and started my own business. due to some weird circumstances I spent some time abroad- had a company in Africa too- we were using nice small diesel gensets to produce electricity.

I don't think you'll need a sparkplug- I'd prefer a glowplug and an electrically actuated sprayer that'll start shooting if the throttle position is too low for the boost that's there.
You'll need to be very careful with the amount you inject because the turbo does not like it too hot- exhaust gas has already lost a lot of it's temperature, with this device you'll feed the turbo with combustion temp gasses. A little bit goes a long way. You'll also need a fine spray, might be good to inject against the flow of hte exhaust gas to get a better swirl. If there is a small droplet of fuel hitting the hot turbine wheel at full speed it's going to have consequences... (that's why I wrote no "responsibility for exploding parts")

 

Diesel-cup? Do you havy any more information on that you would like to share?

Thank you...

 

The diesel cups over here have taken place as parts of the rally championships. Group N cars, like VW Golf TDI with syncro (4WD) and around 300 hp. Also some diesels in circuit racing, especially in the 24h races. They started off with allowing turbodiesels to start in the same class as a NA gasser with the same displacement- but not for long since the diesels were much qucker. In the meantime the diesel cups have been discontinued, all vehicles need to use the same air restrictor and the same max. displacement.
If you like I might be able to supply more info on building compact diesel racecars, but I don't know about the regulations for US championships.

AlpineRAM

 

the rally racing we have, the cars are nothing like the wrc guys. here they are pretty much stockers w/ the interiors ripped out. none of that fancy electronics.

 

Well, rally over here actually means WRC and also group N- which is slightly modified stockers. So a Golf TDI with 300hp and 4WD weighing about 800 punds less than on the showroom floor can still be group N.
I do miss the good old group B monsters. MG Metro 6R4, Audi Quattro Sport (As seen on pike's peak with Mr Röhrl)

http://www.roehrl-walter.de/videos/pikes3.mpg

AlpineRAM

 

your group n cars are pretty comparable to the rally cars over here. i love watching wrc. someone needs to get mccrae back in a subaru! that skoda he drives temporarily is garbage.