Topgear,
What I can tell you is that on an A14, the standard turbo off a 1.5 Pulsar ( T2 ) started to boost at under 1000rpm and was all in with nothing to spare at 3500.
I kept going bigger and bigger in the housings eventually settling upon the T2 off a 1800 Bluebird SSS, that would start to come on @ 2700 and rev freely to over 7500.
I believe that from that the A series, particularly with the GX head might flow alot more than what we suspect?!?
This was all achieved by using an A15 exhaust manifold with a 'J'.
I suspect that if you use the smaller turbo off a B4 it may be too small for the job.
Anyway good luck and I, as i'm sure many of the site members am, will read of your progress with great interest.
Cheers
Dave

Thanks for that Dave...

I thought that the T2 may be a bit too big for an A12 as a street car. I thought that my car may have been a little laggy as I only drive it around the block and have to slow down a lot on the corners, eg 1st gear. But when on the track at speed its on full boost at about 3500-4000... May appear to be a bit late but went like a freight train when it came on (this was with the TD04)...

Was yours a suck-through arrangement?

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MHI TC06-II which is apparently off a Mitsubishi Starion. draw thru 32/36 Weber on an internally stock A14 with 25/65 cam and ACL head saver shim to lower compression, water injection, 2.25" exhaust. it was on a J-pipe and from the turbo a cross pipe simply into the standard manifold - not pretty by any stretch of the imagination, but it was stupidly fast.

yes it was laggy as hell, but at 8000rpm and 10-11psi, you no longer cared!

only failures were:
- headgasket in the first few hours of trying to tune the thing...
- one piston after about a month I guess. undoubtedly due to all the detonation it had at first, which took us a while to get a handle on.
- one tailshaft and 4spd box in the same incident. unsure which one went first, but we went back and collected the remains of the tailshaft on the side of the highway, and it was screwed (twisted) up like it was a coke can...
- and finally the turbo itself, which needs a new bearing and seals.

the other turbo setup I did was an A12 with T25 on custom manifolds, draw thru 2" SU and 2.5" exhaust. standard internally except for a balance and milled pistons to lower CR. Can't remember how much we took off them. It was a better all-round package, but lacked the oomph of this TC06 setup.

I have heard that it is hard to tune turbos with weber style carbies (non vacuum operated like SU). I have only had experience with the SU style suck through set ups and must say that on a dyno it is surprisingly simple, so am keen to stick with it.

I was only going to fit a 2"exhaust on the car but may go bigger??? Im trying to achieve something that creates full 8-10lbs boost by about 2500rpm and goes well from 2500-3000 onwards...

Yea im a little concerned about the tailshaft, im only running a stock one at the moment with new uni's...

maybe a tunnel barrier would be wise ??
or a shaft guide thingy
Just like a big ass piece of metal from stopping it runing your day.
I would really be keen to see some pictures of you 'j' b110, if you can be bothered going to take pics
The more info on this the better.

a tailshaft loop would be a good idea. We made one the next day! but it was really quite uneventful when the standard tailshaft dropped out.

all I did to the Weber was drill the secondary jet. never had any problems with it. I ran it rich, figuring it was safer and would help keep it it cool.

pics? like I said it wasn't pretty. it REALLY wasnt pretty! but I'll dig the stuff out of the box and get a few pics. shame I just got rid of all the A series engines I had under the bench - I could have dummied it up on a head...

No, injected with early fuel only computer.

For those who are following this project it is still a go...I have been busy building the A15 turbo for my 1000... as soon as that is finished I will jump straight back onto this

Anyone have a picture of what a j-tube setup looks like? I'm new to this turbo a-series thing.

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Its just a 'J' shaped pipe that bolts onto the standard exhaust manifold and comes around so the turbo can be placed further foreward and higher. The short end of the J bolts to the manifold and the long end bolts to the turbo.

if I just confused the hell out of you then maybe a pic would be better.