Estimated GT1752 Compressor Map
Turbo Mini Forums

My best guess at what the GT1752 compresor map looks like.

Remember that it is an estimate and I urge caution in its use.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

thats well done axel , very interesting , lets hope its near the truth.
regards robert.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

that would be nice, lets hope so. 12% efficiency increase over my T2 in most areas. that would see some extra power I should think

Cheers Axel

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Axel , which comp map did you use ?, some published "56" maps are wrong the 56mm 55 trim is in the 78% from 15lb to 20 lb at 2 pr,
though the 52 55trim should be earlier
fab

Fab, I used the 2056, 56mm, 55 trim 0.53 A/R curve.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

sorry Axel, but def not same map as garrett one,it look more like the 2052 60 trim which I used to guess the 52mm 55 trim
check at turbobygarrett for the good gt2056 map
fab

the deafening sound of searches for turbo by garret echoes round the turbo mini consortium .LOL

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

there seems to be two maps for the same trim fab , whether its because theres two tip heights and so one map for each height ,
which i think most likely!

,,,or garret got the labelling wrong on this map in an earlier catalog !!,,
who knows !
i had stuck the other map on the 17 thread its fatter and lower .
regards robert

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

The two maps for the 2056, the current one on the TurboByGarrett website and the one above are very similar up to 150,000 rpm.

One then stops and the other goes on to 190,000rpm.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

.. that's pure headacke
I'll stick on my guess , mainly because it compare sure datas, same a/r , same relation between wheel sizes,designs and tip height
56 wheel datas are in the flog
fab

EDIT: Moved to GT17.... thread

Edited by Paul S on 1st Mar, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

found the correct 56mm wheel for this comp map.
tip height for this one is 3.4 mm

Hi Axel!
as you made a very good job with the "higher map"
and cause the 1752 have a 4.1 tip (so this make me think that it have a less taller and more larger map) can you "remap" from this map:
I think it could give the ballpark



cheers
Fabrice

Same it doesnt like a PR of 3!!

Alex

AlexF

Well it certinally makes the goods at 2.1.

We just need to sort the boost threshold now.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Edited by Paul S on 19th Jul, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

On 28th of Feb, 2007 at 08:41pm Axel said:
Fab, I used the 2056, 56mm, 55 trim 0.53 A/R curve.

Edited by robert on 19th Jul, 2007.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

The only real difference is that map shows the compressor performance up to 190,000 rpm whereas the other one stops at 150,000. That does not mean that the turbo will not run faster than 150,000 and do the higher pressure ratio.

The output of a centrifugal device varies with the speed. For example, the best efficiency point will increase in flow proportional with the speed increase and the pressure ratio will increase proportional to the square of the speed increase. That is why the best efficiency line follows a square law curve.

Hence it is possible to calculate the higher speed/PR performance.

Edited by Paul S on 19th Jul, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

????, is that becoming a french forum?
please
take a minute and look at these map religiously, even if the secound have been shopped (if needed I still have the full version somewhere) these are NOT the same ( two different maps with different wheel numbers , and I saw the genuines garretts datasheets ) :
if you don't trust , just look at the cross between 78% and 2 pr, the first one cross at 17lb, the second at 15, and more at the low end of the 78 area the first one cross at about 1.65 pr and 16 lb, the secound at 1.5 pr and 12 lb, regarding what's I'm doing that make a big difference.
but all this is blabla

big thanks to have make the needed calcs
cheers
Fabrice

Axel when we are comparing these supposed squaled version of the same wheel, are the squaling is proportional (ie 92.8%) on both axis x (pressure) and y (flow) ?

Edited by the real sturgeo, axel shall be reposting what he said later on today.

Edited by sturgeo on 20th Jul, 2007.

Bugger, the problem with having two TM members in the same household is that you have to log out and log in etc else you post under each others name as above.

Double Bugger, I think that I may have got my X & Ys mixed on the latest map. i'll check in the morning.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

so on the graph 2.0 pr line is now 2.3
( 2/ 0.8612) and 20 lb is now 21.58 ( 20/ 0.928)...
well that's enough headacke for today
cheers
fab

Edited by Paul S on 20th Jul, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Hi Axel
thanks for that new map.
but I'm confused now,
you wrote