interesting project R/Ternie, are your ears still ringing from the sound of your air compressor and die grinder? - this is similar to a drag race team I know who removed the dividing wall from their 42R turbine housing (he said it took ~20hrs of porting).

This is a great test to show how "wall friction" and smallish a/r can effect the maximum possible flow rate. taking nothing away from your accomplishments, if i traded 1000rpm lag for top end power, i would want a lot more than 30hp if i understand the gains correctly (i could be wrong) Who built your long rod 2.4? 10:1 is a great setup for an ethanol build. are you thinking of testing with a tubular long runner singlescroll manifold?

 

I agree. I'm a huge TS fan, and if there was a larger TS housing available for the stock appearing turbos.... we would've just bolted that on. Yes! The boundary layer plays a huge role... I had a really cool dump tube o2 housing that was a huge failure because of boundary layer issues. (wide but narrow path for dumptube) I did my Junior research project in college on Laminar Fluid Flow in a tube Interesting stuff!

Mike picked up an estimated 40+whp for the loss in spool. The point wasn't to increase the powerband, the point was to set this record. Which we knew the trade offs of this modification would end up making more peak power than the previous setup. Stating the obvious I assume. lol.

English Racing built LR2.4... 10.5:1 CR.
I think Mike is in the middle of his move to VA... I would think a tubular single scroll manifold would make more power over the stock manifold....just from the collector. I ALSO think that the manifold would make quite a bit of a difference especially since one of the BIGGEST bottle-necks has been removed.

Really nice ear muffs and an electric die grinder I turn the music way up and wait for the fiance to come in and tell me its time for bed.

 

I believe the Mitsubishi housings are "Ni-Resist" and not stainless.

I found the exact alloy at one time but don't recall what it is any more.

The TME housing has even more nickle content and is rated for 950C where the standard mistu housing is rated for 900C. I do recall that anyway.

 

Don't the Aussies have a 10.8cm, or 11.0cm housing...or something?

 

^ Ya 10.8 but I wouldn't waste my time with that... I would take a 12.0+ though but a X housing won't fit.

Mikey

 

I've seen the 10.8 but I guess it could be ported to an 11.0??

 

This A/R thing is a bit arbitrary. It depends on where exactly the area measurement of the scroll and the radial length are measured. There is a certain amount of Fudge Factor involved isn't there. Or, maybe I am way off base. Do you know what I mean?

 

Spark, you talking about my housing or the Aussie special? But either way, Yes!

Mikey

 

Mikester: I was just talking in general terms and not refering to your ported housing specifically.

Area/Radius: The area of the scroll divided by the radius from the centerline of the shaft to the centerline of the scroll.

It was just a generalized comment. If you think about it, anyone can kinda play with A/R figures a bit depending on where you slice the area of the scroll measurement.

Sorry, I was just making an off the cuff generalization and not refering to your R/T modified housing.

 

You are exactly correct. A great reason of why we "really" don't know exactly what my housing a/r is. I would also be willing to bet the Aussie housing isn't a 10.8. It is prob a stock one I have never seen one in person and I'm sure Eric has not dissected one to see if they are larger/worth-it.

Mikey

 

This is an interesting foootnote. It would appear to be much easier to determine A/R on an undivided, single scroll housing wouldn't it? When dealing with an undivided housing there is only one scroll centerline. By contrast, on a TS housing there are by definition, two separate scroll centerlines. Then furthermore, on variable geometry housings there is one smaller diameter scroll designed for quick spoolup and another, larger diameter scroll intended for increased topend flow.

 

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Yeah right we can't tell the difference

 

You guys should realize Mitsubishi's number IS NOT an A/R. It is an area alone and has nothing to do with the radius at all.

From what I have personally measured on a 9.8 housing that I cut apart, Mitsubishi measures the area at the tangential point where the scroll meets the nozzle.

I believe the same measurement point is used by Garrett however and is simply the area at the tangential point divided by the distance from the CENTROID of the area to the turbine centerline. Centroid is the important part here as center of area and centroid of area are different.

 

I'm not getting hung up on guestimating a/r as I don't think this conversation is going to yield groundbreaking ideas.

This was simply the result of realizing a restriction and reducing it. I'd like to say it's more calculated than that, but it's not.

03white, I changed several aspects of the housing, so it will be difficult to assess which contributed to the improvements we liked, and the improvements we didn't like.


Gtpumps,
How and what is different about your "10.8" housing you sell from our STD 10.5?