gt17 latest thinking .
Turbo Mini Forums

This tip height issue MUST be resolved.

So I got the socket set out and took a couple of brand new turbos apart



Big difference in overall size, but the tip heights are 3.5mm and 4mm ish.

So I can confirm that the GT1752 has a larger tip height than the GT2056.

This does mean that the Gt1752 will flow more than I previously thought, but it will also lower the pressure ratio at a given speed, so the map will look shorter and fatter.

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."

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

On 21st Oct, 2010 Paul S said:
This tip height issue MUST be resolved.

So I got the socket set out and took a couple of brand new turbos apart



Big difference in overall size, but the tip heights are 3.5mm and 4mm ish.

So I can confirm that the GT1752 has a larger tip height than the GT2056.

This does mean that the Gt1752 will flow more than I previously thought, but it will also lower the pressure ratio at a given speed, so the map will look shorter and fatter.

Edited by robert on 21st Oct, 2010.

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

Robert, do you have any figures for the 13G wheel, as this would probably be more akin to the Gt1752

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."

GT1752:



GT2056:

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 the same casting no on both wheels?

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."

there is a bar code

top pic, 3 digits under the black marker pen.

http://i95.photobucket.com/albums/l154/min...06/DSC00616.jpg

Edited by Joe C on 21st Oct, 2010.

you'd do anything to be right
turbomaster catalog have a lot of misinformation:
this is the real part number from both my vnt2052 audi's
and gt1752s:
http://www.melett.com/turbo-buildsheets.ph...-0002&Submit=Go

That's it this compressor does flow nothing more than 23lb at 1.2 bar= about 200 a-series bhp

cheers
fab

Right lets open a book on this. Closest to the average wins

1. Robert - 260hp
2. Paul S - 230hp
3. fab - 200hp

Any more for any more

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."

Edited by robert on 21st Oct, 2010.

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

There is also the issue that you need a VE of at least 105% to get 260hp from 21 psi boost.

:(

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."

as audi's s4 tuners find more than 360 hp from his original turbocharger 45mm one....

another bit of info , for the open minded ..
heres a link to a dynapak run ,using a 2052 vnt , i assume the 1752 4.1mm tip wheel from the output .dynapak being one of the few rr's id say come close to being accurate .

http://forums.tdiclub.com/showthread.php?t=297085


190 bhp atw ,,. now i tend to use a 2/3 power conversion from diesel to petrol .so this 190bhp would transfer to 285 bhp on petrol ...

this is not a hard and fast conversion ,and is way higher than my estimate ,,

but its food for thought ..if a diesel is making 190 atw from this wheel ,then on petrol it will be considerably more ...

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

Robert I'm very open minded!
but not blind,
you mean saab tuners are sorting 260 dyno power from a compressor wheel that is smaller(55 trim) than the gt2252 60 trim which is already just at the limit at these numbers.
saab are already genuily bad tuners .. they're using a compressor wheel a lot too big for their application?
one dyno power run isn't a stable database, that's what i think.
a good ex, I din't meant that the s4 hasn't been dynoed at 360 bananas, it's just difficult to understand how they extract more power than the compressor wheel can feed, appart from outreving it out of efficiency, a map showing a last curve at 65% doesn't mean that you cannot take from your compressor a bit more and fail is ne the 60/55/50%.

Anyway this 52mm compressor is really in the ball park and very efficient for a-serie application.

[quote=robert,20th Oct, 2010]thought id put up my latest on this pesky little critttur ..

gt1752 specs ,


part no ----------dia-----inducer------tip ht--shaft dia ----trim

436131-0002-- 52,00--- 38,55------ 4,10------ 5,00---------55

so i did a bit of a research ,and thought , i wonder if i can find a comp map that , whilst not identical ,has as similar measurements on the wheel as possible ..

so i found this ..

---dia-----inducer------tip ht--shaft dia ----trim

- 51,00--- 38,25------- 4,25--- 4,90--------- 56

which gives this map ..




and calcs to around 268 bhp max flow .





After a bit of investigation, I shouldn't have tokk this as is:
This is NOT the 51mm 13t wheel

This is the 56mm scooby compressor wheel.

good try

Fab, I think that was what I said, but you may not have read it that way.

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."

Are we saying that the TD04 will pump enough air for the bananas that Nic has, but the GT17will not pump the air for the bananas that Robers has?

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

Edited by Paul S on 22nd Oct, 2010.

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."

Nic already have a bigger one than that..
a lot bigger!!

So whats the 2056 going to do ??? against the 17

Rick

ps, i am very confused by all this but trying to understand as much as i can.

I too would like to know as I have a GT2056 and can't decide whether I should chop it in against a GT1752 or even a Saab 9-3 TD04

If something is worth doing, it's worth doing half of.

From my understanding the same as a gt17 but with more capability further up.

http://photobucket.com/quintonrose