which turbo - to buy new?
Turbo Mini Forums

Hi ive got a turbo'd aseries, 1293cc, roller rockers, turbo cam, omega dished pistons (cr 8:1) fiesta intercooler.- its in a midget not a mini so a bit more space!

i might be changing the turbo - what would be the best garrett for the job - are the gt15's big enough for 10-12psi at max 6000rpm?

the standard t3 is excellent at top end but is a bit laggy - is there a turbo that will maintain the top but also give more lower down?

thanks
Rob

Look at the Mirage website. He does a few hybrid T2s that could be good.

http://www.miragemotorsport.com/

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

as Will said T2 is a good option,well known specs,and even if a little old it does work nicely at these sort of boost you doesn't need roller bearings 360's etc
then if your not money concerned I would buy a brand new gt2052 , ploting some maps can help to find the best comp trim (your set up should have a max cross point at 15lbs and 1.75 and min 8lbs some ratio) make sure you are leeting a little place above the last point in case if you want a little more :)
fab

i have the mirage first hybrid on mine, and i can highly recommend it

Ah nic, I have been meaning to ask this, which one did you get? The T2 hybrid or the T25 jobbie?

I think that the GT1752 of a Saab is better than the T2s.

Do a search on "GT17".

Only problem will be mating the manifolds to the 38mm diameter turbine inlet.

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."

the t2 hybrid

what is the boost range of a hybrid t2, say one that could boost at around 17-20psi on a 1293 engine, without needing a rebuild every 5000miles (if posible?)?

or would it be best to use a t25 for that sort of boost? or would it be more laggy than a hybrid t2 as described above?

i know every engine boosts differntly due to differnt cams, cr etc etc, but just to get an idea.

hope that makes sence! lol

cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

I have got this one for sale, just so you know.

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=143995

Manchester Minis

I think Dave, that it's peoples understanding of what exactly lag is.

Those who know, would say that a T3 has barely any (and I would agree to some extent). Problem is that it has a high boost threshold (commonly referred to as lag).

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

the trouble with t25 is that the smaller a/r is 0.49.
the problem with t2 is that it is limited above 2p/r by reliability and by 15lbs (+/-150bhp) by speed/flow (note it's still a very good unit under this number my first one gave literaly boost just above idling)
the problem with the t3 is his weigh (wheels one)
an hybrid t2/t25 will give t25 flow with t2 smallers a/r (0.35/0.41/0.47) but at cost and generally need centerhsg upgrades for high p/r (360's , BB)
so as for engine size cam c/r valves camber/castor tires cwp compromise have to be done
but:
today a gt 20 or gt17 , depend on needed flow will do all this with garrett factory research department behind so
there is enough modified turbos here to know which set up give what; then it's just a question of going on knowed maps and plot boost treeshold, max boost/at max torque and at max hp (3 points) and select which ones is the more efficient in the prefered usable revs