hi all,
after much research into this i have decided to sell up my k03 stuff and opt for a gt1752 becase i think it is overall a more efficient urbo at the boost pressure i want to run on my 1341 engine. i hve nly just learned to read compressor maps and the compressor maps i have got fr the gt1752 are only speculations as there isnt one officay publised but i obtained this info from a mini fourm and comparing his turbo to a k03 i have found that:
@ 20 psi/ pressure ratio of 2.36 the gt1752 run on a 1341 is,
5% more efficient @ 4k rpm
7% more efficent @ 5k rpm
17% more efficent @ 6k rpm
18% mre efficient @ 6.5k rpm
the compressor maps that i used are the ones ive posted below ignore th red line on the k03 one as its not m calculation it was somthing somone did to do wth a 1.8 20v.
im also looking at a gt2056 the slightly bigger brother think is found in the mg zt ? to the gt1752 but i think the 2056 is prbably a little to big a maybe more suited to competition/track cars but it is a very good turbo non the less,
The main question i have is i know that the A/R effects spool up time a top end flow th bigger the mor flow ad the mallerthe faster th spool up but from whati can see the A/R on the saab variant is .53 and correct me if im wrong but i think the k03 is around.44 i think that maybe.53 isa little to large just wondering if any on knows if they do a smaller housing that could be fitted or if .53 will be ok?
Also wonering if any one knows the spec of the psd schrick turbo cam as i have a newman copy of the shrick turbo psd cam an i want to know if its going to be ok to run with this turbo or wether i should be gong for a tamer gt cam to help spool up due to the larger A/R.
i am planning on using a 9:1 cr and am hoping by using a more efficient turbo i could get away with running higher boost like 20psi with out the addition of aquamist would this be ok or would i need to drop the compression ratio to 8.5:1 to avoid using water/methnol injection or maybe jut run on 97 ron fuel as im after nice off boost car.
ko3 compressor map
gt1752
got al the calculatiopns ive done here aswell i can post tem up if people are really intrested!