Stage 1
Posts: 55
Joined: Mon Feb 04, 2013 4:16 pm

PostPosted: Sat Jul 27, 2013 1:31 am
I have maps from garret for vnt15 and vnt17, but there is a big contradiction. VNT17 has a bigger compressor wheel, but at higher boost, lower PR , higher rpm???

VNT17, lets say 13 lbs/min flow, can do 2.6 PR (1.6 bar gauge at sea level)
At 20 lbs/min flow, 2.0 PR (1 barG at sea level)

VNT15, at 13 lbs/min flow (6 kg/min), can do 2.45 PR (1.45 barG at sea level)
at 20 lb/min flow (9.1 kg/min), can do around 2.45 pr (1.45 barG at sea level)???????

See maps below.. the vnt17 comes from garret site, the vnt15 from other forum.

VNT17
http://www.turbomaster.info/img/aplicaciones/GT1749V-778445-0001-compmap_th.gif

VNT15
http://i40.photobucket.com/albums/e208/schmeldenhoffer/car%20pics/3809turbomap_1st_idle.jpg

hi,
vnt 15 have a bit little exaust shaft of vnt 17 .
Also in link posted of vnt15 compressor map,there is no wheel diameter and trip,
so really we doenst know if this map is of audi,fiat golf or other.

Good point, but it is one that is shown on tdiclub forums for a long time.

I also have a problem with the vnt17 map (from garret distributor site in spain).
The efficiency islands are missing the top half (those ovals you see inside the map)