Vehicle Boost

[MK-84]

I think of weird ideas late at night while drinking too much

I was thinking about the differences of turbocharging a car. The problem with a turbo is that it requires the engines exhaust gasses to spool it up, thus creating turbo lag. Now I am not thinking about cost or "practicability" I am wondering if this concept could even work.
What if instead of using the engines exhaust what if we used a different source to spool the turbo, like a gas turbine. Advantages would be consistent boost through out the rpm band. The only problem I see in concept anyways would be that the turbine exhaust would probably be too hot. but for say a run down the dragstrip and for giggles would something like that even be feasable?

[MrKrabs]

I think of weird ideas late at night while drinking too much

I was thinking about the differences of turbocharging a car. The problem with a turbo is that it requires the engines exhaust gasses to spool it up, thus creating turbo lag. Now I am not thinking about cost or "practicability" I am wondering if this concept could even work.
What if instead of using the engines exhaust what if we used a different source to spool the turbo, like a gas turbine. Advantages would be consistent boost through out the rpm band. The only problem I see in concept anyways would be that the turbine exhaust would probably be too hot. but for say a run down the dragstrip and for giggles would something like that even be feasable?

Because refractory metals are not that cheap 

[Fish42]

I think of weird ideas late at night while drinking too much

I was thinking about the differences of turbocharging a car. The problem with a turbo is that it requires the engines exhaust gasses to spool it up, thus creating turbo lag. Now I am not thinking about cost or "practicability" I am wondering if this concept could even work.
What if instead of using the engines exhaust what if we used a different source to spool the turbo, like a gas turbine. Advantages would be consistent boost through out the rpm band. The only problem I see in concept anyways would be that the turbine exhaust would probably be too hot. but for say a run down the dragstrip and for giggles would something like that even be feasable?

You mean something like this

http://youtu.be/U81_0waqEWA

[SPKmes]

wouldn't that be a superturbo charger ?

[SilverZ06]

If you are experiencing too much lag it is because you have your turbo incorrectly sized for the engine. Back in 2000 I put a t25 turbo on my nissan 200sx se-r and there was very little if any noticable lag. When I put the t3/t4 on the car the lag was terrible. But once that t3/t4 got spooled the car would scoot pretty good. Even though the car was (felt) faster with the t3/t4, the quick response of the t25 made the car more fun to drive. I never got to the track with t3/t4 on but with the t25 the car went 13.06@107. Not bad for a 4cyl car that looked stock from the outside. I surprised many a v8 back in the day with it. It was a fun little sleeper as long as you couldn't see the front bumper. 








Here is the t3/t4 on it:


sorry for the small photos, I had to get them off car domain from the guy who bought the car from me.

[j500ss]

In this day and age we have what we call VGT's  or Variable Geometry Turbos.  With proper installation, and controller programs these turbos provide positive boost at all engine speeds, basically all but eliminating turbo lag.

No, they willl not work in every application, but say back 6-8 years they should and or could be quite adaptable, given a overwrite exists for the application.

Practically every diesel that is turbocharged over 80hp has this type of turbo on it now.

[SilverZ06]

In this day and age we have what we call VGT's  or Variable Geometry Turbos.  With proper installation, and controller programs these turbos provide positive boost at all engine speeds, basically all but eliminating turbo lag.

No, they willl not work in every application, but say back 6-8 years they should and or could be quite adaptable, given a overwrite exists for the application.

Practically every diesel that is turbocharged over 80hp has this type of turbo on it now.

I believe Porsche also uses them in their turbo models and have for some time now.

[Skuzzy]

Twin scroll turbos also help to eliminate lag, when matched to the correct engine size.

[SilverZ06]

What lag??     

[Skuzzy]

In an application where lag is present, a twin scroll turbocharger can help mitigate it.  Obviously, it is not always needed.

There is "lag" in that chart.  It may not feel like lag, but from about 3.0 to 4.5, there is some lag, or the curve would have been less exponential, after that point, and more linear.

[SilverZ06]

This is just a dyno chart from a Toyota Supra. Those guys like to really oversize their turbos to make big power. It was not posted in response to your post about twin scrolls. Now that I look it, it seems as though I was arguing with you but I was not. I was merely posting a severe case of lag. 

[TopGear]

Rockwell developed something along the same lines. A turboencabulator.
http://youtu.be/lVZ8Ko-nss4

[Skuzzy]

This is just a dyno chart from a Toyota Supra. Those guys like to really oversize their turbos to make big power. It was not posted in response to your post about twin scrolls. Now that I look it, it seems as though I was arguing with you but I was not. I was merely posting a severe case of lag. 

Ahhh,...okay.

[SilverZ06]

Rockwell developed something along the same lines. A turboencabulator.
http://youtu.be/lVZ8Ko-nss4

 

[jeep00]

Did Chrysler do some work here in the 80's with the VNT setup? My father in law had a lebaron with this and it had very little lag. Certainly not compared to my (over)boosted 89 volvo 744.