Looking at TopGears thread Im convinced this
is the way to go for a 10psi A12/14 hybrid.
Can anyone tell me which would be the best
turbo from the twin turbo liberty that are
listed here?

http://shop.ebay.com.au/?_from=R40&_t ... _sacat=See-All-Categories

I gather the higher numbers are just the latest
types as they seem to be all the same size???
IHI have little info online on sizing etc

Any1?

Turbo Type ----------- Approx flow @ pressure
IHI VF 25 ------------- 370 CFM at 14.7 PSI
IHI VF 26 ------------- 390 CFM at 14.7 PSI
T3 60 trim ----------- 400 CFM at 14.7 PSI
IHI VF 27 ------------- 400 CFM at 14.7 PSI
IHI VF 24/28/29 ----- 410 CFM at 14.7 PSI
IHI VF 23 ------------- 423 CFM at 14.7 PSI
IHI VF-30 ------------- 435 CFM at 14.7 PSI
IHI VF-22 ------------ 440 CFM at 14.7 PSI
IHI VF 25 ----------- 395 CFM at 18 PSI
IHI VF 26 ----------- 400 CFM at 18 PSI
T3 60 trim ---------- 410 CFM at 20 PSI
IHI VF 27 ----------- 420 CFM at 18 PSI
IHI VF 24/28/29 -- 425 CFM at 18 PSI
IHI VF 23 ----------- 430 CFM at 18 PSI
IHI VF-30 ----------- 460 CFM at 18.0 PSI
T04E 40 trim ------ 465 CFM at 22 PSI
IHI VF-22 ---------- 490 CFM at 18.0 PSI

1 HP approx equals 1.45 CFM
1 CFM approx equals 0.0745 lb of air/min
0.108 Lb/min approx equals 1 hp
1 Meter cubed/sec = 35.314 CFS = 2118.867 CFM
1 KG/sec = 132 lbs/min approx equals 1771.812 CFM
power coversions:
1 PS = 0.9859 HP = 75 Kgf m/sec
1.3405 HP = 1 KW
1 HP = 746 watts

yet to find the smaller VF sizes CFM...

I would think a td04 vf23 would suit? Similar to early rex and forestor as well

2 x diahatsu charade turbos works great!

your information in the posts above suggest that entire list is about twice as big as you require

Absolutely too big :(

Need the info for smaller ones below 250 CFM.

First thing to decide is the rev range youwant it to work over and how complicated a set up you want. The surge line to the choke limit is usually (very roughly) a factor of 2 in flow, newer turbos have a wider flow map, so a turbo that starts at 1000rpm will be just about done at 2000. One that starts at 3500 should see you right through to 7000, something in the range of a T3 or TD04 for an A series (again roughly, depending on the engine).

The advantage of a big turbo is that it works great up top generating the least heat and restriction the down side is it won't be very exciting down low. Porche chose the big turbo route and this is my preference but each to their own.

Have a look at Ray Hall Turbo charging, there's a calculator that will give you a very rough idea. A reasonably accurate and easy tored book is a turbocharging book by corky bell. I read a really complicated academic orientated book on turbocharging to written by a German Professor but unless you're into maths and heavy text it'll put you to sleep.

I like the saab 900 turbo setup using a T25
it comes on song at 1800rpm with 80 per cent
of torque available there and goes all the
way to redline with a big flat torque curve.

I prefer that kind of setup where its on song
early and just creates a big far low and midrange
where 90 per cent of driving is.

Looking at the VF16 atm which makes 95kw atw at 3900rpm
in a 2 L boxer. So maybe a well setup 1.4 will make that
close to that 5500rpm.

i would kind of hope no one gives you advice anyway.... cause you havent told us what you want to use the car for

i have been plesenlty suprised by how early boost is coming on with my CA18DET. i too love boost early as possible, especially for a street car

firstly, don't put too much stock in TopGear's thread. 240rwbhp is simply impossible from 330cc injectors. 170rwbhp and they'd be well and truly maxed out. its a bit unclear if he fitted the 440cc injectors before that or after, but they'd be maxed at about 220rwbhp. Its reasonably unlikey that the stock gearbox or tailshaft would stand up to one dyno run at that power. There was no mention of clutches in that thread either, and both the old A12 turbos I built had issues holding in 3rd gear on uprated clutches. And we would have been making about half what they claimed.

I've used an S13 T25 before. worked well on an A12. Would make enough boost at 60kph in 4th up hills that you wouldn't have to downshift, for example.
A mate used to use stock WRX turbos on his Suzuki Swift with very good results too.