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The Merkur Club of America Forums • .48 and .63 turbine w/custom elbow advise
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.48 and .63 turbine w/custom elbow advise

Posted: Fri Sep 17, 2010 5:51 pm
by BuzzBomb2.3
So, the amount of spare parts I have allow me to combine either a stock .48 trim turbine or a .63 turbine spinning a T3 GN (Basically an S3) wheel. Originally, I decided I would just run the stock .48 turbine and housing when the "what if" factor came into play...

The .48 will reduce spool, but the .63 obviously has better potential for higher HP numbers. I would like to aim as high as possible with either trim if it doesn't change what I already have. The "3 turbo-to-tip is already welded in and I don't want to do any more custom work for the exhaust that doesnt fit the same as stock (IE: Cossie). I would like to retain the factory flange fitting, but am open to better flowing options if any exist short of re-fab work. Any ideas other then polishing?

Posted: Fri Sep 17, 2010 7:20 pm
by RatFink
You should put the .48 on there and do this to your down elbow.
Image
You will never look back.
Edit <Oh damn, disregard I didn't notice the re-fab thing>

Posted: Fri Sep 17, 2010 7:47 pm
by hEaT
What is your goal? A quick spooling street car or a higher hp open road car?

Posted: Fri Sep 17, 2010 8:48 pm
by BuzzBomb2.3
I planned on the .48 housing but i'm not sure which way I may run it at this point.

I've finished tearing both turbos apart and discovered a few things. The housings are indeed the same, the internals are exactly the same and both shafts are the same diameter.

The big problem I didn't foresee is that i've found the GN shaft to be longer then the XR4 shaft. The turbine blades are also MUCH shorter then the Ford T3's. I think all Ford T3 shafts may be the same length which creates a new problem. Either I have to find a similar shaft turbine, or send the GN wheel off to be machined/balanced so it can clear the minimum thread count. That would then pose problems for the GN housing if it'll even work. :(

Well, the plan seemed like a good idea at the time I considered it...

Posted: Tue Sep 21, 2010 3:04 am
by LS2XR4
BuzzBomb2.3 wrote: I've finished tearing both turbos apart and discovered a few things. The housings are indeed the same, the internals are exactly the same and both shafts are the same diameter.

The big problem I didn't foresee is that i've found the GN shaft to be longer then the XR4 shaft.

Can you use the GN turbine wheel along with GN backing plate,compressor wheel and housing on the T3 center section. It should take up the extra length
The turbine blades are also MUCH shorter then the Ford T3's
I believe they were clipped from factory
[/quote]

Posted: Tue Sep 21, 2010 12:28 pm
by MerkXRTurbo
If you want the best of the best, bolt on a Cossie turbine housing and fab a down pipe for it.

Posted: Tue Sep 21, 2010 12:42 pm
by mecatech
the best in rally is:

ar 48 and 63 for the turbine.

AR 48 of sierra cosworth and escort T35 turbine 0.63

Posted: Wed Sep 22, 2010 12:24 am
by BuzzBomb2.3
LS2XR4 wrote: Can you use the GN turbine wheel along with GN backing plate,compressor wheel and housing on the T3 center section. It should take up the extra length


They looked similar, but I can give that a shot.

I haven't had a lot of research time lately. I'll have to measure the shaft length and see if there are any similar shafts with a .63 or .48 turbine that will work. The whole idea was to make a cheap performance upgrade turbo. If the price to cut the wheel is too high, i'll just scrap the idea and put the GN turbo back together then Flea-bay the sucker.
BuzzBomb2.3 wrote: Either I have to find a similar shaft turbine, or send the GN wheel off to be machined/balanced so it can clear the minimum thread count. That would then pose problems for the GN housing if it'll even work. :(
I'm trying to figure out what I was thinking when I made the second half of that statement. It wouldn't make any difference for the housing if the turbine can't fit properly on the shaft... :roll:

Posted: Thu Sep 23, 2010 10:49 pm
by BuzzBomb2.3
Its update time guys since I had a day off. The news is much better then I had previously thought.

The .48 shaft fed through the body and bolted to the compressor is (would you believe it) just ONE thread shy of totally seating on the shaft. Keep in mind that I had to use the XR4 T3 nut instead of the GN nut because it was not only twice as big but stuck out past half the threads. I used the GN body too for "mock-up" since the XR4 body is a mess. Lots of parts still need cleaning. The pictures will explain more below:

Image

Image

Image

Think I could get away with torquing to spec and using Loctite?

Posted: Fri Sep 24, 2010 2:04 am
by MerkXRTurbo
Ooh, Starett... that is a nice set of Calipers!

I would just use locktite. When I built my T3/T4 it was the same way... no biggy.

Posted: Fri Sep 24, 2010 5:06 pm
by murdomino
Hmmmm kind of funny, American made and it is Metric. perhaps the other side is ase standard measurements lol :wink:

Posted: Fri Sep 24, 2010 6:10 pm
by BuzzBomb2.3
murdomino wrote:Hmmmm kind of funny, American made and it is Metric. perhaps the other side is ase standard measurements lol :wink:
It runs from 1-10 with "10" = 1 in. It's a 1/1000ths in. caliper.

Yeah, I don't remember when or where I picked it up. It's just worked every time I needed it for the last......20 years?