I was talking last night on IRC and didnt really realise how easy it was to put a turbo onto a Astron until yeh, got told the sigmas had 2.6L turbo variants so now im as excited as a 1st grader opening up his yogo.. i just need to get the parts and thinking if they are indeed very rare that i'll have to get them from all over aus, anyone know any parts anywhere or anyone whos done this before? i'm going to ring some places today but probably wont have any luck, in the pricing stage to see how much its going to cost me, im thinking, if i can find an engine with not make K's on it, ill just buy the whole thing and have it rebuilt and blueprinted while im still truckin round in my own 2.6 and then when the turbos done we can just swap it along with maybe upgrading the fuel line and putting in a turbo exhaust. :cool:

Any info you guys have or knowledge on it you wanna plant in this thread do it, dont even think about doing it :shock: do it subconsciously. :bowrofl:

ok the sigma turbo is astron one slightly diffrent bolt up to the astron 2 what u running and sigmas are rwd and magnas are fwd it would be a full custom setup sigma one wont sit right in the fwd possy

hate to spoil it for ya but apparently the mounts are different... so no straight swap, or i would have done this already. i think u could possibly use the manifolds and such to do it... but u'd wanna check the bolt pattern be4 buying anything.

ring dave at rpw or dallas at street torque. i know street torque turboed a tn not long ago, and dave's had plenty of experience with sigmas.

Best of luck and let us know how it goes.


Tim

Yeh i'd rather use my motor cause i know it hasnt done many k's but while i was posting this i got the transplant idea.. thanks miller ill get onto those two guys straight away... i wonder if street torque would give me a discount if i mention booya :cool:

Yeh i'd rather use my motor cause i know it hasnt done many k's but while i was posting this i got the transplant idea.. thanks miller ill get onto those two guys straight away... i wonder if street torque would give me a discount if i mention booya :cool:

Nah i reckon they'd charge you more for all the headaches his already given them :D

brillaint! ive been waiting for someone to do it!

first bummer is u cant use a sigma engine bec its pre emission . they allow newer engines into older cars but not older into newer for transplants. They wont allow it even tho basically same.

Also magna came out in 85 and that year ULP was intro'd so valves, comp etc r not right for ULP from a sigma motor, and u would need to use LRP anyway.
plus sigmas were all carby, and the efi that came out on late 1st gen magnas and 2 nd gens is a very good system, its better than most bec it only sends a fuel pulse on the copmpression stroke, not all the time and that gives the 2.6 efi excelent low end and midrange torque. im not sure what the GSR Turbo sigma puit out but probably not much more than the 98Kw ands 205 Nm the efi 2.6 made.

plus the efi engine is ecu controlled so u could get away with a piggyback ecu that makes a big difference to whats possible in tuning compared to non ecu controlled suck through carb setup. there was even a 2.6 astron drag car in the US pulling 8's !!!, as the advertising for Haltech.

so its still a good idea to turbu your 2.6 but not a good idea to try use the sigma motor, best sigmas do the opposite and take the efi setup from a magna.
also a modern ball bearing turbo is better than a worn out old style bush turbo from early mitsub turbo if your money stretches to it,
i would look at the sigma setup to see where they pick up oil and water lines from, possibly heater hose and oil pressure switch are good points to pick up from.
maybe move throttle body to the other side of manifold, whichever is best for giving most room for piping.
get the sigma turbo exhaust manifold, it should probably bolt staright on if u can get one, but there might be an aftermarket manifold and turbo adapter available,
the rest is all intake and exhaust plumbing and up to u if you get an IC, or water injection, BOV or wastegate, decompression plate, etc etc depending how far u go for how much boost u want, and money u got to pump in.

From what I have researched, the Sigma Turbos officially came out only in 2.0L Turbo (4G63BT???) and produced 116kW from the Factory :D

i cant be bothered going back and finding the link but someone is selling a complete turbo setup right now on ebay. just search magna. i also think from the location and goods it is probably tbutchers mate. looks good and fairly cheap. beats doing it all yourself.

its a 4g54 and if it is b that just means borgwarner trans :D

i posted this on the mogwa forums a little while ago:
How to build a 10second sigma! applies essentially to the 2.6 magna aswell cept u probly wont get 10secs from the FWD config


(this came from the hot4's forum...)


easy, Astron 2.6, remove balance shaft and fit blank shaft in its place...
remove Cylinder head, and start porting......(you are looking for flow, not compression or swirl, just flow) you'll need quite a few heads and a flow bench to get this right.....
Add low-compression pistons (i'm told that forged Holden 286 pistons are the go in these engines)
Chrysler Hemi-6 rods and ARP Rod-Bolts)
totally re-engineered Crank, stuff like cross-drilling, wedging and knife-edgine are the things you want to do.....
Turbo, personally i'd be looking at something that gave me maximum boost of around 18-22Psi...
Igntion - Mechanical Advance, static 8' all in by 2800 RPM, and a total of 38' dynamic
carburetion, you cant go past a 48-50mm Webber for this engine, you want it modded for Blow-through NOT DRAW THROUGH......
You also want a 50-75Hp NoS kit (set for spooling up the turbo, NOT adding Hp)
Holden Tri-Matic Auto (3500RPM Stall Converter - Manualised) (Rod-Hadfield in Victoria can make a conversion plate)
you want a strong-ass diff, (maybe Hi-Lux or 9" ?)
Now here is the part EVERYONE FORGETS.....

Your diff ratio should allow you to cross the finish line at MAXIMUM REVS (Ie if your torque start dropping off at 7800RPM, then you should be crossing the line at 7700RPM)

This setup should cost around $10-15,000, and be good for about 10.8 - 10.5 sec and be streetable (ok ok only just...)

How do i know?
A Mate built this exact combination and ran consistent 10.5's......
J



or http://forum.hot4s.com.au/messageview.cfm?catid=17&threadid=3203

intresting but those blow through carb setups are fugly...and a lot of complicated hybridization there...almost more holden than mitsi! and no way u would get a trimatic sideways into a magna.

but still proof that the 2.6 astron properly done is able to go as hard as any other turbo4.