7 porter progress, Engine build Number....seven?? ....now K1200
Turbo Mini Forums

bollocks, just typed a lengthy post and lost it, stupid wirless box... try again...

yes,

wheels measure,

compressor inducer = 45
compressor exducer = 59
turbine inducer = 53
turbine exducer = 45

forgot to take tip height measurements though... but by my calcs that makes a compressor trim of 58 and a turbine trim of 72.

unfortunately i'm not terribly up on trims,

I also plugged some figs into the motorgeek calculator, using the 1.9dci renault (which apparently runs 1-1.2bar boost??)

using that as a reference I guestimate the turbo would normaly run 10-12psi and shift about 18lb/min?? But what the map looks like i dunno.

But it appears that wheels from gt15-25 could be fitable as they seem to use the same diameter shafts... so i may be able to use sy a gt2056 compressor wheel with this turbine.... if its any good....

Edited by Joe C on 30th Aug, 2007.

so, that makes it a (VNT) GT1859 then!

Swapping stuff out depends if Garrett decided to keep the same bolt pattern for the compressor backplate (to cartridge) as they did for the standard GT17/20/22 series units I guess.

I don't know where you're meant to get GT parts from though... Turbomaster refuse to sell outside of spain it seems?

gt1859....?

does that mean the map is going to be more like the gt1759 than the published maps for gt25's

Well, the only 59mm map (unless i'm mistaken) is the 2259 - and yours is a larger trim...
They clearly make compressors specifically for the VNT units, no doubt with different blades and tip widths.

I guess all you can do is try it!!!!!!

Indeed.

I was thinking the saab gt17 was 59 trim for some reason...

Edited by Joe C on 29th Aug, 2007.

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

Thanks Robert that is helpful,

The 452214-3 is the map i have been looking at and assuming it might be somwhere near, so it looks promising-ish...

i think i have been getting overly worried by the physical size of the turbo, it is pretty massive,lifting it on and off you can't help thinking, that'll never spool, or if it does it'll just surge....

I expected the compressor to be too big, but as I said I think it will work but not be ideal. i just need to get some data and then go from there

It of course doesn't help that the head is a bit of an unknown too...

we will see what happens!!

i think it should be a stonka !
i just thought ,have you got a wastegate on it as well as the vnt ?

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

yep,

its hidden down the back of the block, a 35mm external one, smallest I could find.



eventually I want to go to a long stroke too, gearbox & clutch permiting....

Hmmm, Sorry for the bum info - your writing :

ok, sorry yes i did cock that up!

been and pulled the lid off it again to check the measurements,

as you can see its the 6/12 wheel






measured the exducer tip like this...



which gave...


looking at garretts maps I'd expect the 466541-1 map to be closest to my wheel.

havent pulled the turbine end off as its a pita to get it together again.

Edited by Joe C on 30th Aug, 2007.

So the compressor is 59.4 / 41.9...

:)

Yes - definately pointing to the GT25 maps, not the 2259.

blimey,

maybe I better change my name to "Surgemaster" lol.

well, i should be able to use the vnt wastgate to control the bottom end boost to keep it out of surge and use the wastegate to control the top end boost, that will give me some figs to work with.

Well - trouble is we just don't know what the map could look like.
Robert / Axel / Fab seem to have their head screwed on as regards interpretting maps for different sizes. Be good to see their input.

Well, given those compressor dimensions, I reckon that this is your map.

http://www.turbobygarrett.com/turbobygarre...14_3_comp_e.gif

I'm not fully aware of your engine spec, but this would suit 200-250hp at the top end, higher if you can use the 3:1 pressure ratio.

As it is a VNT, you should be able to get higher boost at lower air flows and it will spool up quicker because of the variable nozzle.

Problem is that you will be running close to the surge line at 3-4000 rpm.

What are your plans for the car? Road or Racer? If road then have a re-think. If racer, then you've got a goodun.

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."

usage, bit of road, bit of trackday, bit of drag, but in a full weight car, kind of like miniwilliams i suppose.

spec, initially a 1380 with a phase 2, but i intend on doing something more radical with the cam at some point (wider LCA and faster opening/closing) and going to an 86 or 88mm crank.

ah, 1380 will definately help keep away from the surge...

I seem to recall i found some pics on the net ages ago (like 2 years+) on a honda forum of someone who had (for whatever reason) pulled a compressor housing off a (I'm sure) brand-new GT2259 to have a look inside.

I'll see if i can find the pic of the compressor. At least a visual if it looks the same would be useful i reckon.

Oh well as it is a 1380, that'll be fine road or race.

I reckon on 200hp from 15 psi boost, so about 19 lb/min at 2.1 pressure ratio - right in the sweet spot and a long way from the surge line - if it is the GT2259 map posted above.

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."

Well, here is the picture.

I could have sworn it was a bigger image than this. I tried to find the link, but gave up after a half-hour of looking. I'm 99% sure it said it was from a GT2259 however.



There are some numbers you can just make out - not sure how these will compare to yours?
It's clear my reference about the 59mm being a 8-blade is also bum info.... This is clearly a 6/12 (or is it bum info that this was a 2259 grrrrrr - I hate not knowing for sure)!

If it is comparable to the GT2259, yours is a smaller trim than this however; a 50-trim comapred to a 52 of the garrett website. That said - if it is what it looks like it is (and the VNT part works) then this could be interesting for sure!!!

Dave,

all i can see is



thanks for digging it out though!

hopefully it will be what we hope it will be!

On 30th of Aug, 2007 at 01:07pm mini13 said:
yep,

its hidden down the back of the block, a 35mm external one, smallest I could find.



eventually I want to go to a long stroke too, gearbox & clutch permiting....

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

On 31st of Aug, 2007 at 06:15pm robert said:
axel the love god

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."

Ah I can see it now Dave!

and guess what..... snap! same no's on my wheel

Indeed I hope that I won't need the wasegate, but i added it anyway just in case as i expect the vanes to stick at some point....

thanks guys, good feedback from all three of you! this is looking like it may well work out to be a good compressor wheel(fingers crossed), althogh from reading around some of the diesel performance forums on they see full boost (over 20psi) at under 2k rpm on a 1.9!!

i reckon i'll deffo need to get the mappable boost sorted to 1 keep it out of surge and 2 make it drivable...

Any more progress on this Joe?

Just out of interest what gauge ally did you use and do you know how many cc's the plenum is?

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

Nothing major, been slacking a bit recently, just sorting out getting the rad to fit right, and stuff like that.

I used 2mm wall tube,

the main body is 3.5" dia albeit with approx 1/3 cut out and a flat plate welded in where the runners are, length wise as its slashcut at the rad end the front edge is 13.5" and the back edge is 15.75" so i guess lengthwise 14.4 is about right.

then there is a short 3" dia x 2.5" long curve leading into th the main part from the TB.

OK... volume.... typing as i think here...

3.5" x 14.75" =
90mm x 375mm

3.142 x (4.5x4.5) x 37.5= 2386

2/3 of 2386 is 1590cc

3" dia x 2.5" =
76mm x 63mm

(3.8x 3.8) x 3.142 x 6.3 = 285cc

1590 +285 =

1875cc total.

actually thats less than I thought as I had so far forgot about the lost 1/3.

i'll try to get round to getting a jug out and actually measuring the volume.