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  #1  
Old 01-29-2013, 01:01 PM
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Location: Albuquerque, NM
Posts: 173
Question for 617 turbo gearheads

I am in the middle of upgrading a number of things on my '84 300D and first on the list is rebuilding the turbo. I finally got the turbo out of the car and dismantled see photo
https://picasaweb.google.com/lh/photo/smFILkZxVtBea0tisRZ12NMTjNZETYmyPJy0liipFm0?feat=directlink
The turbo looks to be in excellent shape with some evidence of oil seeping past the seal on the exhaust side with some carbon buildup under the heat shield.

I bought an "upgrade" Stage I turbine wheel that has the exact same dimensions as the stock wheel, except for the inducer (major) diameter. The inducer on the stock turbine is roughly 2.5" and the inducer on my new wheel is 2.3" , see photo:
https://picasaweb.google.com/lh/photo/8Ep2AbbvsH8Dz-uVx0-9tNMTjNZETYmyPJy0liipFm0?feat=directlink

So my question is this:
All other things being the same, will an exhaust turbine wheel with a smaller inducer (major) diameter give faster spool-up but lower max boost?

Last edited by kestreltom; 01-29-2013 at 01:26 PM. Reason: more info
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Old 01-29-2013, 01:11 PM
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Bigger exhaust will give you quicker spoil up is what I understand.
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Old 01-29-2013, 09:51 PM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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I hope you don`t mind if I copy and past the pictures, case you deleate them.

Can`t help on the Turbo rebuild.























Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 01-29-2013, 09:58 PM
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Location: SoCal; Now Amarillo TX
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Quote:
Originally Posted by kestreltom View Post
So my question is this:
All other things being the same, will an exhaust turbine wheel with a smaller inducer (major) diameter give faster spool-up but lower max boost?
I wouldn’t be too concerned with max boost on the turbo. Its possible w/o a wastegate to push over 20 PSI with a stock turbo. That is about 7 psi over what you could ever hope to accomplish when using an unmodified injection pump. Gaining a faster spool is a definite plus.
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2010 VW Golf TDI Cheetahhh
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1983 200 (Euro 5spd)
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  #5  
Old 01-29-2013, 10:14 PM
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Join Date: Dec 2012
Location: Albuquerque, NM
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Smile

Quote:
Originally Posted by charmalu View Post
I hope you don`t mind if I copy and past the pictures, case you deleate them.

Can`t help on the Turbo rebuild.























Charlie
Thanks, Charlie.
I don't know why, but the discussion board software does not let met copy and paste images into my posts.
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  #6  
Old 01-29-2013, 10:21 PM
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Location: Albuquerque, NM
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Thumbs up

Quote:
Originally Posted by w123love View Post
I wouldn’t be too concerned with max boost on the turbo. Its possible w/o a wastegate to push over 20 PSI with a stock turbo. That is about 7 psi over what you could ever hope to accomplish when using an unmodified injection pump. Gaining a faster spool is a definite plus.
I totally agree, W123love.

My plan is to install a 2.65 rear diff, and by rebuilding the turbo, replacing the compression wheel with a new one, and upgrading the exhaust turbine, I hope to get a little bit faster spool up and maybe a bit more boost down low, say 8-10 psi around 1500 to 2000 rpm under a moderate load. I am hoping to find an oem t3 garrett stage II turbine, which will require machining the exhaust housing to accommodate the larger exducer, but I think it would be worth the trouble.
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  #7  
Old 01-29-2013, 10:35 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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Don`t want to get the thread off track, but what did you get the 2:65 from? I know the W116 6.9 used this Diff, and has the Clutches.


Charlie
__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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