t3/t04e .50 AR?

[emperor_lunchbox]

does the .50 ar mean 50 trim?The guy selling this said it's off of a Honda and will not work for a Nissan?That doesn't make sense to me.Is there something I am missing?

[MarkEmark]

does the .50 ar mean 50 trim?The guy selling this said it's off of a Honda and will not work for a Nissan?That doesn't make sense to me.Is there something I am missing?

haha...of course a honda owner would say that--considering no hondas come from the factory turbocharged...

.50 a/r is the housing a/r, NOT the trim

[KATwo40]

A/R stands for area/radius ratio. It only applies to the size of the housing. It has NOTHING to do with the trim.

Also, .50 A/R is a little small for a To4E
Modified by KATwo40 at 1:22 PM 2/25/2006

[hannibal]

Ive seen 0.50, 0.60, 0.70A/R for T04E compressors. I still dont fully understand what effect comp A/R has on lag.

Turbine A/R is more important when it comes to lag. T3s with A/Rs of 0.48, 0.63, and 0.82 are common used on the KA.

One of my pet peeves is when people say 0.50 trim. Its either 50 trim or 0.50 A/R. Trim refers to the wheel and A/R refers to the housing.

[4felix20]

http://www.turbobygarrett.com/....html

some good info there about trims and different A/R housings

[KATwo40]

Ummm...it's .50 trim or .50 A/R. the trim is a measurement of the wheel yes, but the number is a calculation of the values of the exducer and inducer on the wheel.

A/R on the compressor had nothing to do with lag. It only determines flow capabilities.

[hannibal]

A/R on the compressor had nothing to do with lag. It only determines flow capabilities.

Care to explain further? Are you saying if two housings of different A/R, but using the same size (trim) wheel, the larger A/R would flow more at a given rpm?

[Edub1]

For your purposes compressor A/R will have no appreciable affect on anything.

The exhaust side A/R is important. Smaller will spool faster but limit flow in the upper RPMs.

You want a .63 A/R exhaust. My T04E has a 50 A/R compressor and my super 60 T3 has a 60 A/R.

This info is easy to find. You can search here or simply Google it.

[KATwo40]

The larger the compressor A/R ratio, the more efficient the compressor operates at lower boost levels. Heat will be down, but the difference in lag will go unoticed, because it's such a small difference.

It also allows for more flow on higher boost levels, from all the research I can find.

So, if you have a .50 A/R compressor housing, it'll be less suitable for low boost applications than a .70 A/R compressor housing.

[C-Kwik]

Care to explain further? Are you saying if two housings of different A/R, but using the same size (trim) wheel, the larger A/R would flow more at a given rpm?

Yes. The A/R is essentially referring to the size of the nozzle. The air going through the turbine has to go through the nozzle. The Larger the nozzle, the more it can flow. However, smaller nozzles increase the velocity of the gas going through it, effectively providing more exhaust energy at lower airflow rates. This gives you less lag. But at higher airflow rates, it will become a restriction, much like having too small an exhaust on your car. Most people will probably be looking for a good compromise of both spool-up and flow.

[KATwo40]

I'm seriously taking a hard look at the VATN turbocharger. (Variable Area Turbine Nozzle) Diesel engines have been using them for a while now, and I just can't understand why gasoline engines aren't using them. Perhaps the cost is the deciding factor.

[Edub1]

Here. Read all about turbo specs.

http://www.forcedinductions.com/help.htm

[hannibal]

I understand turbine A/R and lag, but I was specifically wondering about compressor A/R. No one ever discusses it.

Thanks for the explanation KATwo40. That makes sense to me.

[Edub1]

The only info I have seen on compressor A/R said that it didn't affect anything too much.

I can tell you that my .50 T04E compressor and outlet is far bigger than my .60 T3 compressor & outlet.

Are you building a Formula 1 car?

If you are that concerned with the minutia, perhaps you should look at the newer ball bearing designs.

If you just want a fun car, any of the popular turbo options will have a well suited compressor A/R for that turbo.

T04E = .50 A/R T3 60/super 60 trim = .60 A/R T25 have a .43 A/R I think

Bottom line, just get a .63 A/R exhaust and the right compressor - A/R will take care of its self.

[virus77]

I'm seriously taking a hard look at the VATN turbocharger. (Variable Area Turbine Nozzle) Diesel engines have been using them for a while now, and I just can't understand why gasoline engines aren't using them. Perhaps the cost is the deciding factor.

Check out Porsches new 997 turbo thats coming out. It uses variable turbos with virtuall no turbo lag, makes 470 lb of torque at 1900 rpms-5000 rpms. Its freaking nuts, More torque than a V10 can make down low.

[hannibal]

Edub, I guess you dont know me that well. my favorite question as a kid was "Why?"

I havent grown up much