Done a little bit of homework, and there are some references to it beign done, but nothing concrete.
I was planning to turbo an a15, but for the dollars spent, It might be a better option to go to a factory turbo motor.

Has anyone done this, is it possible (within reason as everything is possible with enough money)?? comments?

I think that you will find that a simple j-pipe turbo will be alot cheaper than a conversion. A turbo a15 will still go like the clappers on 8psi with not too much more than a decompression plate to the long motor.

In terms of conversions, there are a few factors. In NSW at least, I dont believe you can get a 1.8 litre turbo registered because of the weight of the car. So this rules out the ca18det, leaving you pretty much with the ca16 or toyota 4age.

Then there is the weight of the engines. They are both more than 20kg's heavier than an a series and as 1000's cant exactly change spring rates, etc, it could throw that out.

But heck, it would be a bloody exciting thing to drive!

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For the dollars spent, bang for your buckwise I would stick with the turboed A15.

I know on the racetrack the naturaly aspirated multivalves were being beaten by John Taylors A15, and I doubt if a blown 1600cc multivalve would be making much more HP than a Blown A15.

if 20kg's is all thats in it, don't take a passenger too often, (or use it as an insentive too loose weight) and whack a 4agze in it provided money isn't an issue...

I saw some of those photos of a ca 18det into lagwagons 1000. From memory, its about $2500 for a front cut silvia. You could do a direct transplant touching nothing and I reckon it would come out about the same. as the a15 jobby.

In my guesstimation of 15 turbo job, i reckoned
rebuild a15 - $1000
computer - $1000
turbo - $800
custom pipe work to make it fit - $500
misc - $800
= $4100
plus everything else!!
The a15 was planning on going efi, crank angle sensors, rollers, double valve springs etc, the whole bit. so basically a modern efi motor, but with the heritage and simplicty of transplant.
But with hp figures of about 170hp at the flywheel for a standard ca18det, i would think that you wouldnt get that sort of hp from the a15 without serious mods.

Is my logic logical??

Dazzaute I am not quite sure how much, probably a bit more but it was just a conservative estimate. But where the weight is along the wheelbase also has an effect.

The computer is probably the most expensive thing, but that is assuming that you go injection. If you use a simple SU style carb on a suck through set up, it will be quite cheap. You should be able to get a turbo for less than $200. If you can do the work yourself, a rebuild kit is $100.

Good luck

hmmm that does sound cheapish, but yeah was planning on goinf efi. Since this is not the daily driver anymore, and there is no hurry on stuff, i wanted to go a bit silly

i reckon allow a bit more for the ecu, probably more like 1500 and at least another 500 for tune/ setting up. I no with my setup i had to buy a vl fuel pump $200, injectors (4) $100), regulator $100, the ecu and tune/fit up was nearing $2500 and that was a base model e6x haltech still single coil etc, throttle body $50, depending on your fabrication skills at least $1000 for manifolding/ dump pipe or do it yourself, intercooler and piping $300, then things you dont think of like clutch $800 (i went overboard first time round) etc. Stocko decomp motor will take a bit. Or the alternate suck/blow through for under a grand all up, depends what you want from the car i guess.

Its still a little confusing. I reckon that the A15 will end up costing more that buying a ca18 or similer to get it technologically the same (efi, crank angle sensor, turbo etc) , since I have to rebuild the A15 to suit, and a low k jap import shouldnt need a rebuild yet since a standard one would be more than enough to start with at this stage.

Its the installation that is the question. Will it cost the same to install the a15 as the ca?

Its the install that I dont know anythng about.
I have to go custom exhaust anyways for both
move engine mounts for both
new raditaor for both
move the battery box for both (larger radiator and neateness)
new clutch for both
new diff for both
new prop shaft for both since 60a 5speed is planned.

I expect that the ca would cost more, but is it significantly more?