gt17 latest thinking .
Turbo Mini Forums

Edited by robert on 22nd Oct, 2010.

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

im lost a little in the argument...
from my research ( from along while back) that map is specific to the TD04H 13T, a scooby turbo, i believe it is the only car to have that spec turbo

do you need a measurement?

Yes i moved to the darkside

Instagram @jdm_brett

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."

Chill out guys. Surely the one thing everyone can agree on is that unless you have these wheels, side by side, and map out the curves, you aren't REALLY going to know...

How about we move this into a different direction and figure out how you'd actually build a compressor map, using tools you'd have laying around the house? LOL

Seriously though - how do you think this could be done? I'm thinking of a very large (truck) turbocharger connected to a motor that allows it to be spun up - the airflow of which then drives the turbine of the turbo you are trying to measure...
This would allow turbo's to simply be 'bolted up' rather than trying to drive the shaft directly (at very high speeds)!!!!

I guess the turbo speed can be sorted with the tool from garrett, and the outlet (compressor) pressure can be generated with a simple choke - but how to establish what 'flow' is on this big of a scale?

Thoughts?

(nice pleasant ones please LOL)

thatll take a shed load of energy, surely 50+hp motor? perhaps a nossle or 2 driving the turbine wheel with compressed CO2?

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

I guess the flow could be measured using a MAF.

Jean

http://www.jbperf.com/

right

That's it:
your wrong and no way disrespect just pure numers
you've shown a larger map to feed your guess as paul oftenly does..
true is this map sorted from audi (the average dealer) and then "my"estimated guess , Paul and you is just a big dish of nothing like fog.

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

You can tell its a full moon lol!

Just so its clear. I use a Dynapack dyno and I can tell you that you could do power runs all day and the trends would pretty much all lay ontop of each other. what you will also see is the slightest dip in torque that a roller dyno normally flattens out due to its inertia.

What I think Robert is saying about the Dynapack, is that, without the tyres, the reading at the hub, is as accurate as you will get to measuring the power of an engine in the car. If a calibrated instrument reads something different to what it is actually measuring, it is therefore, not calibrated.

Fab, you talk about the dyno readings as just fantasy numbers, but if the dyno is calibrated, how can the wheel power figures be fantasy. I think you are talking about the flywheel figures, bit it is not 100% clear, and you may consider any power figure from any dyno to be bananas?

seems alot of hot air to me

does all this really matter? we know the gt17 works, ignoring the dyno/rr graphs its been proven to give low down grunt, good road manners and enough for a 13.28 up the strip on a full fat car, you can show all the graphs and opinions you like real world use is more important.

Edited by wolfie on 23rd Oct, 2010.

just a "bit" of gin tonic after a hard day..

some of the top ones:

"with a lean misfire on a lot of the run and retarded timing . i had 241 at the wheels."

"peaking at around 19 psi and dropping to 17 ,versus my side pipe run ,on 21 psi. dropping to 17 again."

"note :the wobbly bit is a 16:1 air fuel mix missfire ,due to me not pulling out the choke fast enough"

to sump up:

We have a 1.3cc carburated restricted a-series
with a peak power boost at 17engine psi pushing 243 BHP at the wheels with retarded timing and lean misfiring needing pulling choke.

and I should eat this without understanding.

In my head:
How an a-serie can flow 400 cfm thru the carbrestrictor/carb/siamese port?
how this marvellous turbo can flow 400 cfm at over 2.4 PR??

Hi all, I don't actuly own a mini but I've been following all of these gt1752 threads on here for a while and I think now is a good time to ask for some of your expertise and advise as you seem to know alot on this subject.
First of the engine I'm building is a 1341 overbored 8v forged vw polo g40 engine with a 9:1 cr using standard digifant mapable igniton and electronic mpi injection. The engine was origianly supercharged as some may know I have gone down the turbo route for more power. My current setup is with a kkk k03 turbo which on these engines has been proven to make 200bhp with 20 psi boost also using aquamist water meth injection to help prevent det and a 268/268 cam.
I have done my calculations and have relised that the k03 is well past it's limit running 20 psi and must be blowing very warm air!! I'm looking for 220 bhp reliably and have bought a gt1752 as it is much more efficent but after this change in thinking is it worth me messing about with it changing manifolds and down pipes if this turbo is not as the estimated map. In your opinions will I gain my 20 bhp moving away from a k03 making it worth my while ? At 5-6k the k03 was off the compressor map 55% efficent or less and the gt17 was in the mid 70's around here roughly 22lb/min at 2.3 pressure ratio ( exact calcs at left at work will post them when I get them back ) in your experince with this turbo what would you say ? from what i worked out using old estimated compressor map the gt17 was
5% more efficient @ 4k rpm
7% more efficent @ 5k rpm
17% more efficent @ 6k rpm
18% mre efficient @ 6.5k rpm
than the k03 is this still likley to bethe case or was that map very far from what it might atualy be like
Thanks in advance Antony

Edited by Dub-disaster on 24th Nov, 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."

so the map may be a slightly different shape but am i correct in thinking that beacuse the compressor wheel is the same apart from tip height as the 2056 albiet scaled down that it will still be 78% efficent at its maximum efficency??

Edited by Dub-disaster on 25th Nov, 2010.