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breakdown of all the turbo numbers ?


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#21 marksweet

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Posted 20 November 2004 - 01:02 AM

I believe it is the volume of the turine housing. fi am incorrect someone correct me or expand on the thought! Mark





#22 Grey_Wulf

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Posted 27 November 2004 - 06:48 AM

The 6cm or 7cm in the turbine housing is the A of A/R.  it's the area at some given point...not sure what point that is.  I would like to find out some time, then i could know their respective A/R's

#23 marksweet

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Posted 27 November 2004 - 07:42 AM

A/R=area to radius ratio.
The area of any turbine inlet scroll cross section divided by the distance frm the center of the cross section to the center of the shaft. I wish I could do a drawing but may be able to get a reference to he post I got this info from.Mark

#24 marksweet

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Posted 27 November 2004 - 07:50 AM

Check your email. grey_wulf. mark

#25 Whiplash

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Posted 07 January 2005 - 01:59 PM

The turbo that I took out my 87 Quest has some numbers missing. It has 491_8-017_0. On the other side it shows _05-1__. The _'s are blanks. It looks to be OEM.
I would like to show the picture, but I have no web site upload program at this time. Could this be a manf. defect. Or a reman blank? I could e-mail the pic. if needed.
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#26 Whiplash

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Posted 07 January 2005 - 03:40 PM

http://tinypic.com/173ecz
Conquest owner since 1995. Quest has been on stands for a few years. Engine being built. Powder coating everything. ARP head studs and rod bolts. Caravan head with NEW cam, SS swirl polished exhaust valves, roller rockers, Mild port and polish. More coming,...
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#27 Whiplash

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Posted 10 January 2005 - 11:13 AM

After rubbing a little dirt on the turbo. And wipeing dirt off my glasses. I could make out the top numbers better. It shows to be 49178-01750.

At http://www.lmsspeed.com/MitsuTurboUpgrade.htm it shows that it's an upgrade 1985-87 turbo. What's the differance between the 1985-87 and the 1987 & 1/2 -89 turbos. My Conquest is a 11/86 build date. What would I do to upgrade to a 89 style turbo?
Conquest owner since 1995. Quest has been on stands for a few years. Engine being built. Powder coating everything. ARP head studs and rod bolts. Caravan head with NEW cam, SS swirl polished exhaust valves, roller rockers, Mild port and polish. More coming,...
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#28 Metric-man

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Posted 10 January 2005 - 03:22 PM

QUOTE
After rubbing a little dirt on the turbo. And wipeing dirt off my glasses. I could make out the top numbers better. It shows to be 49178-01750.

At http://www.lmsspeed.com/MitsuTurboUpgrade.htm it shows that it's an upgrade 1985-87 turbo. What's the differance between the 1985-87 and the 1987 & 1/2 -89 turbos. My Conquest is a 11/86 build date. What would I do to upgrade to a 89 style turbo?

The cartridge and the compressor housing seem to be the same .
You have a two(?) vacuum ports on your waste gate actuator the 01760 probably has three.
(On line service manual Intake and Exhaust page # 11-15)
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#29 APalmer

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Posted 27 January 2005 - 09:33 AM

I have another "Numbers" question related to this. I don't understand the definition of "TRIM".
For example, you can find Trim often described for Mopar replacement turbos, and there is a great variety involving different Trim options such as at
http://turbosunleashed.com/shop/product_in...products_id=187
Can anyone put this, also, in plain English?
Thanks very much in advance - Andy
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#30 marksweet

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Posted 27 January 2005 - 11:54 AM

Andy the trim is the relationship between the inducer and exducer of a wheel, compressor or turbine.
I'll talk compressor wheel. As you look into the bore at the wheel you see the inducer section of the wheel. Let's say the size measured there is 2.13". If you dissassembled the turbo and the measured section at the wide part(exducer of a comp wheel) and got say 3.00" you can calculate the trim. the formula is: 100*(2.13/3.00)^2=trim.
In english divide the inducer size by the exducer size and square it. Multiply that number by 100 will give you the trim. In this case it is a 50 trim compressor wheel. Unless you were an engineer you could not put this to use. It involves the way the air comes off the wheels fins as it is being compressed. The 50 trim is a very popular wheel for the DSM's 2.0 motor as it seems to be very efficient and pump gas friendly allowing up to 22 psi on pump on those motors. I run one on my '93 Talon. Boosted_One should know a bit as he is familiar with Garrett turbo's which can be custom built using the trim whels the customer wants unlike a standard Mitsu 16G for example. Hope I helped a little. Mark




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