Why is it that Garrett makes a variable vane turbo for Ford diesels but it can't make a T3 turbo for cars to use? It would be easy to build and control. If I'm not mistaken it uses a wastegate actuator to control the vanes. This would give us the ability to have a t3 turbo spool alot faster than normal t3.

 

probably the heat/pressure causes problems with the vanes?

 

I asked the same question and got what you just posted!Looks like the heat from gas motors does damage to them.

 

Heat is not the real reason. Current gen 911 Turbo uses twin VNT turbos. I believe the main reason these don't get used is concern that the turbos spool up too quickly. Too fast turbo means early failure. I talked to Robert at FP back in my Galant VR4 days and at the time he had no interest, saying the benefits did not outweigh the failures. First car appication for VNT ( and I am dating myself here) was a dodge shadow shelby version. Chysler had many issues with the turbos from a warranty perspective. Based on what background I have (MS in unsteady fluid dynamics in centifugal (turbos and helicopter jet engines)and axial flow compressors (regular jet engines)), I believe the control side is the problem. You have to be able to monitor the speed of the tubo (acceleration) AND the airflow not get it to surge. You have to react before you run into aero issues. All that being said, I think it is a real opportunity to develop one and pt it in a car. You could have the opportunity to run a very large exhaust housing and use the vanes to give you spoolup.

hope this helps.

 

http://www.porsche.com/microsite/tec...PMT911TurboAll

 

Well since I know Garrett has this technology, I wonder if one of our well known companies could go into development with Garrett to develop this kit for the X. You would probably have to have a piggy back or stand alone to use the turbo, but I'd imagine that most race teams would do with in a heartbeat it it was proven reliable. If I were well off I'd volunteer my car and finances to helpdevelop this kit. It would ve possible to get max tq similar to the Porsche at very low rpm and have sustained 30+psi. Oh what a fantasy world I live in.

 

This is not a huge benfit in drag or road racing because once you are up on boost you don't get out of it. Rally teams use anti-lag which is hard on the equipment, but pretty cheap to implement. Easier way to get to the same place... The big advantage for these units is on the street.

 

There was also Dodge Daytona Shelby with VNT and I believe it was early 90's.

 

Prepare for one of the weirdest sounding cars you'll ever here on the dyno:

[youtube]HgGe1BOZl0I[/youtube]

[youtube]y9bi3hTaFUA[/youtube]

Pretty awesome, no wastegate at all, just a VGT controller controlling boost

 

Heat is the real reason. In order to make the turbo reliable at gasoline temperatures (950C-1050C vs. 760C for diesel), you have to use exotic materials. Can it be done? Yup, as evidenced by the turbos on the 911 and also the Garrett turbos on the Audi R15+ (http://honeywellbooster.com/booster-...new-turbo-era/ ).

You can buy the 911 turbos as Borg Warner sells them as a catalog item. But you'll probably get a good bit of sticker shock; I'm pretty sure they are well over $3k per turbo and they're roughly the same size (flow wise) as the stock Evo turbo.

 

Wtf kinda sounding car is that

 

3K is not bad actually, I would hop on it if someone made an awesome turbo using Variable Vane technology, or even Ti-Al like the TME turbo setup.

 

I am pretty sure that Porsche only run 10-15 psi of boost.

Most evo's I know run 23+

 

I have been thinking about this for quite some time now as well.

The concept proves for an ideal setup since it allows you to run a lot of flow yet at the same time greatly decreases spool-up time. This is actually the design of the future in aircraft jet engines.

I'll have to check my references but I don't think temperature is the main reason. I'm thinking more like price and durability.

For the amount of money that AMS charges for their turbo kit, they should throw variable vane turbo in there!!

 

because when they got dirty, then flapping fan blade stock. and they become useless... unless you take them a part and clean them. That is what i remember from the long time happened discussion about this.
Also they dont take the high temperature really well because a way they designed . Its a dead end for an engine like the evo uses. Specially for racing purposes.
The lighter turbine wheels /like titanium example RS or TME turbos/ way more beneficial and give you much longer life time. Even when they got abused buy the ALS...