7m CT26 vs Group A CT26, a visual comparison

MDCmotorsports

Offical Expert: Turbochargers
SM Expert
Authorized Seller
Contributor
Joined
Mar 31, 2005
Messages
4,193
Location
Indy 500
Ive been wanting to do this for a while, so here we go.

To catch you up:

http://www.supramania.com/forums/showthread.php?126168-7M-CT26-VS-Turbo-A-CT26

A history lesson on racing Mk3 supras:

http://www.dtdirl.com/forums/showthread.php?t=4951

Now for the fun stuff!

The stock CT26 measurements are as follows (inducer/exducer):

Compressor 1.70"/2.550", 5 blades
Turbine 2.650"/2.045", 10 blades

The Group A CT26 are as follows (inducer/exducer):

Compressor 2.075"/2.895", 5 blades
Turbine 2.785"/2.275", 9 blades

And now for some pictures:

Comp wheels. Group A on left.



Comp wheel height. Group A on left.



Turbine wheels. Group A on right.



Turbine wheel height. Group A on left.



Turbine housings. Group A on left. Notice the size difference.



Turbine housings. Group A on left. Notice the part number difference.



Compressor housing of the Group A. Serial number possibly?



Group A from front:



Group A from side:



Group A from rear:



Hope this helps ladies and gents!
 

LPC

New Member
Authorized Seller
Joined
May 20, 2010
Messages
24
Location
Rose Bay - Sydney
Firstly, thanks for uploading pics of this.

However I am rather curious in the difference between the Group A CT26 and Turbo A CT26, that is if they are not the same ?

I own a Turbo A and by the looks of it, the turbo's are exactly the same, except the exhaust housing is rusty on mine, and have the same part number 42020. The only difference I recognise is that yours is missing the stamped "E" on the intake side.

Is there anyone out there that can confirm differences between Group A and Turbo A ?
 

limbodk

New Member
Authorized Seller
Joined
Oct 19, 2010
Messages
9
Location
Auckland
I have a Turbo A supra, but when I bought it off the previous owner he had unknowingly swapped the turbo for standard ct26 as it was smoking, sigh, there is no helping some people.

Anyway has anyone even heard of a Turbo A ct26 for sale as I would like to restore my car back to its Turbo A glory.
 

IJ.

Grumpy Old Man
Authorized Seller
Contributor
Joined
Mar 30, 2005
Messages
38,726
Location
I come from a land down under
My understanding is the TurboA road cars ran the garden variety CT26, nothing "special" about it at all, the GroupA Race cars were a very different beast as in Jon's pics above.
 

limbodk

New Member
Authorized Seller
Joined
Oct 19, 2010
Messages
9
Location
Auckland
It is a different part number in the Toyota parts catalog, and there are a few visual comparisons from people who have pulled them off the Turbo A road cars, Turbo A cars also dyno bigger numbers than a standard CT26 could put out.
 

IJ.

Grumpy Old Man
Authorized Seller
Contributor
Joined
Mar 30, 2005
Messages
38,726
Location
I come from a land down under
It is a different part number in the Toyota parts catalog, and there are a few visual comparisons from people who have pulled them off the Turbo A road cars, Turbo A cars also dyno bigger numbers than a standard CT26 could put out.
As always I'm happy to be proven wrong as I don't like to spread incorrect information.
(turns out only the inducer size changed, turbine is the same so only 25>35 extra HP)
 

scorn

New Member
Authorized Seller
Joined
Nov 20, 2015
Messages
2
Location
Houston
This might help someone else down the road.
I was curious about the trim difference between the two turbos.

ct26 supra "stock"

compressor
43.18mm inducer
64.77mm exducer

trim 44.4444

turbine
67.31mm inducer
51.943mm exducer

trim 59.5517

ct26 "group A"

compressor
52.705mm inducer
73.533mm exducer

trim 51.3734

turbine
70.73mm inducer
57.785mm exducer

trim 66.7456