GH Sigma + 4g63T SOHC Stroker + GT3076r = ???

[Anchor]

'81 GH Sigma

Bought this off a good bloke in bris about 11 months ago now.

Engine:
MPI G63BT 2.0 Single Cam

Exhaust:
3" Stainless from Exhaust Housing to 3'' Magnaflow Muffler, 3" exits out the back

Suspension:
Monroe Shocks, Kings Springs, Nolethane Bushes

Wheels:
1981 Spec Polished Peter Wherrett Specials with Whitewalls (+5 PWS's out the back.)

Modifications:
Balanced & Shotpeened Rods
Forged Ross Racing Pistons 30thou Over
Autronic SMC 1.4v Management with 1.9 chip
Twin MSD V6 Commodore Coils and Twin Ignitors
Turbosmart Plumb Back BOV 38mm
FMIC hidden and painted black with Polished Piping
VN Throttlebody
Custom Inlet Plenum
560cc Evo 7 Injectors
Bosch 044 fuel pump, surge tank, secondary pump.
Custom Highmount Steampipe Manifold (heatwrapped)
Garrett GT3076r BB Turbo 0.63 Rear Housing
Full 3" Stainless Exhaust with deleted Screamer Pipe
50mm Trust External Gate
Oil Cooler painted same colour as car
Braided Lines & Speedflow Fittings for All Fuel & Engine Oil Lines
Hydraulic Clutch Conversion
Button Clutch - Exedy 8 puck cushion button
JAP 5 Speed
Custom Tailshaft
Mitsubishi Scorpion Disc Brake Diff with 3.3 gears... Unsure on this one..
Autometer Oil Pressure & Boost Guage
ARP Head stud kit
Valve Springs
Cometic Head Gasket
Custom catch can setup.
NOW HAS STD QLD PLATES


Stereo Audio / Visual:
Clarion source Unit
JVC 6" Fronts

Proven Power:
221rwkw on 23psi (297.1rwhp) wheelspin on Dyno Pump fuel and a little octane booster

When i bought it.






My new plumbed back system i made after getting defected for atmo bov and catch can


The screamer


New coil position with new coils. Leads went from 200m long to about 30cm..


On a cruise up here in cq.





Shitty engine bay pic


And after 9 months of trying to figure out why it was doing this. Diagnosing everything i could (and lots of other people) could think of...


I got the shits, pulled it apart and found this.... Also cracked in 3 places and scored the bore.
Cause - jet valve head. no 3 jet valve wasn't sealing. Oil getting into fuel mixture = fail. Thats what i've been told.. ?? (the sealing part)



So now the game plan..


Hoping to be back on the road in about 3 weeks.


Aaaand just so you guys know i don't do something half assed.. A pic of my el camino in all its glory

Now has a dead auto.. I wonder why... rofl



Few pictures of what i've been up to the past week. As well as the old fried clutch. Didn't like 2nd gear launches







New head as well as an AEM adjustable cam gear and some new arp studs
Ported intake and exhaust. Fresh everything. Double Valve Springs. Ralliart copy 35-70 70-35 cam. 3mm oversize exhaust valves.


Piston/Bore clearance on no.3 is too far gone. Can't sleeve just 1 cylinder. Cost $800 to sleeve all 4. I could get a new block and just bore that out.. Or...

$685 - Wiseco – K571M86 – 86.00 bore – 8.8 comp ratio - suit 100mm stroke
$435 - Eagle – H Beam connecting rods - CRS5900MA3D – 5.900 Length


+ a 4g64 100m stroke crank from somewhere... ?? Don't feel like paying $900 for one.


This is getting expensive.. Haha

But i won't need water/meth to reach my 400rwhp+ goal. Which also saves $800 not including setup and extra tuning time..

The way i see it, i'm even?? Lol. + I could use the extra torque from the bigger stroke/bore.



New clutch also just arrived. Thanks to doug @ NPC. Re-drilled my flywheel to fit a skyline size clutch. 5 phuck brass button ceramic. Should be fun to drive.

[DanTurboLancer]

Very Nice man!!!

I like somone that does things Properly!

Love the Low key attitude, the Venitians and white walls!!!
And the Power is also great!!

[Anchor]

Very Nice man!!!

I like somone that does things Properly!

Love the Low key attitude, the Venitians and white walls!!!
And the Power is also great!!

Thanks. Should be more fun with around 400rwhp (goal)...

Re - low key. I think i might change this sometime towards the end of the year when funds rebuild themselves.. Thinking bosozoku style. Deep dish, bolt on flares, low, negative camber, etc etc

[Anchor]

was wondering where this car got to
nice work

Haha it's been through a few owners i know.. I'll have to keep it for a while with all this money going into it

[Anchor]

Just ordered: To suit 1g 4g63 6 bolt crank. Stroker.

Wiseco K571M86 Forged Piston Kit.
Eagle CRS5900MA3D H Beam Rods.

$1200 later... Lol. Better make 400rwhp

[GC75]

how much did it cost you to get the clutch done?

and is it advisable doing that when you have 2.6 astron with twin webbers?

my clutch is being a prick and yer wanna upgrade anyways... probably a good option

[Anchor]

how much did it cost you to get the clutch done?

and is it advisable doing that when you have 2.6 astron with twin webbers?

my clutch is being a prick and yer wanna upgrade anyways... probably a good option

Probably overkill for 2.6 with webbers. But it cost me around $900 to my door. Not bad for the size/etc

[GC75]

ah ok

[shuggy]

how much did it cost you to get the clutch done?

and is it advisable doing that when you have 2.6 astron with twin webbers?

my clutch is being a prick and yer wanna upgrade anyways... probably a good option

Probably overkill for 2.6 with webbers. But it cost me around $900 to my door. Not bad for the size/etc

haha fukkk thattt.. i could buy 3 galants wit that

[brendon]

'81 GH Sigma
On a cruise up here in cq.

You wouldn't happen to be in Rocky, would you?

Stupid work won't let me see the photos (photobuckets banned) but there at very nice sigma turbo I've seen on Southside and a Blue El camino crusing around as well. sounds too good to be a coinsidence.

[Anchor]

'81 GH Sigma
On a cruise up here in cq.

You wouldn't happen to be in Rocky, would you?

Stupid work won't let me see the photos (photobuckets banned) but there at very nice sigma turbo I've seen on Southside and a Blue El camino crusing around as well. sounds too good to be a coinsidence.

Aha yeah.. That's me. Elk is the daily atm.

The sigma is beige with pws wheels, venetians and whitewalls.. Sleeper spec

[brendon]

Yeah its very nice def. sleeper.
First time i saw it, I went around the block to check it out again. make sure it was a sleeper and not a granny spec with tough wheels.
do you know if there is any other sigma/scorps etc. around here?

I'd been keen to go for a cruise (not lapping) when mine are up here?
who do you cruise with?:
ignitioncq.forum guys or one of the other cars clubs around
(the only other one I know meets at Redhill homemakers, can't remember the name though)

[Anchor]

I think there's 1 or 2 around but i hang around with the turbo boys (www.boostcruising.com). Head over there go too offtopic and find the CQ thread. Good bunch of lads. IgnitionCQ is a bit weird... More motorbikes and stock commo's lol.

Yeh the redhill meet, not a car club. Myself and 2 mates started that about a year ago and it's grown heaps. Started off at coffe club with 5 of us haha. 1st sat of every month. It's moreso oldschool but everybody is welcome

Re pigma - yeah a lot of people double take haha. It's good to stay under the radar too, not many cops take notice. Although now thanks to my driving it's on video file @ the cop shop with the defect squad..

[Anchor]

New turbo beanie


Exhaust manifold before i sent it down to Competition Coatings to get it done in that high temp black stuff


Stroker Crank (Bottom one) you can see the extra stroke in the picture.



And since errbody likes pictures...

Eagle ESP H-Beam Forged Rods For Mitsubishi 4G63 6-Bolt 90-92.5 Eclipse/Talon/Laser
Eagle "ESP" H-Beam Connecting Rods are constructed from 4340 Forged Steel for the highest level of strength. These rods are complete with 3/8" ARP Series 2000 Rod Bolts and ARP assembly lubricant.

Part Number: CRS5900MA3D

Wiseco Piston Inc., is a World Class manufacturer of hi-performance, forged pistons for the snowmobile, motorcycle, ATV, personal watercraft, outboard marine and automotive markets, including Sport Compact Cars. Wiseco has emerged as a world leader in the manufacturing of the recreational and racing industries by engineering, testing and manufacturing the finest aftermarket forged piston available today!

Wiseco's pistons outgun cast and Hypereutectic pistons, giving you stronger pistons and tighter tolerances than any other part in your engine, with less internal and external machining. Wiseco's advanced forging process and extensive heat-treat and finishing process assure you of the performance and reliability you demand from your high performance engine.

Rings, wrist pins, wrist pin locks, and pistons are included in this listing.


Eclipse 1988-1992 4G63 with 4G64 Stroker (Crank=2.3 Liter)
Part Number: K571M86; Bore mm/inch: 86.00 / 3.386; Oversize: 0.040(max); Stroke: 3.937 / 100; Rod Length: 5.905 / 150;
Comp Height: 1.130 / 28.7; Head cc's: 47; Dome Dish: -21; Deck Clearance: .012 / 0.3; Comp Ratio: 8.8; Pin Dia: 21mm;

[Anchor]

Paid $330 for that one. They were out of "Turbo by Garrett" so i just got the GCG print one. Same thing.

[Anchor]

Yay Conrods turned up today

[shuggy]

youve got me wanting to do this conversion so badly ahaa

[Anchor]

youve got me wanting to do this conversion so badly ahaa

Eh, just jump in lol. I could have rebuilt it cheaply to still make 300rwhp reliably. But i thought fuck it, while it's apart i may as well do it properly...








New parts today yay

Exhaust manifold back from Competition Coatings. Awesome job for $240 incl freight to CQ. Got it done in the highest temp black stuff. Coulda got shiny shit cheaper, but wouldn't stay shiny long and not as good with heat.




New ACL Race Series Copper 1.6m Headgasket. And full gasket kit.


And a gates timing belt set. Good ones.

[woops]

Nice work there. I would hate to see the bills for this set up.

I think the only thing that would make this build up better would be if you were to go twin cam. But the fact that you already have the inlet and exhaust manifolds to suit the SOHC i can see why you would stick with this set up. And with the right head you can get pretty close to twin cam flows.

The DOHC 2.4L turbo engine is what i would intend on putting into the galant. It's the engine Mitsubishi should have made.

[Anchor]

Nice work there. I would hate to see the bills for this set up.

I think the only thing that would make this build up better would be if you were to go twin cam. But the fact that you already have the inlet and exhaust manifolds to suit the SOHC i can see why you would stick with this set up. And with the right head you can get pretty close to twin cam flows.

The DOHC 2.4L turbo engine is what i would intend on putting into the galant. It's the engine Mitsubishi should have made.

I thought about twincam also, but would have been a lot more work. I picked up the head pretty cheap, has about 3k worth of work and i payed 1k.. Practically new.
I'd also have to change intake manifold, exhaust manifold, dump pipe, ignition, etc etc. I'm confident i can get around 400rwhp on the SOHC with this turbo..

I added it up the other day. Around 5k seeing as i bought rods and a clutch when i didn't really need them.. Also a few other bits and pieces to make it look nicer

Helps i don't pay labour. Good having a dad who builds motors for a living Learn shitloads!

[DanTurboLancer]

Nice work man, looking great!

Its worth it when you get a nice freshly built motor out of it,
that will haul some serious ass!!

[Anchor]

So after a few 2am lengthy phonecalls to Titan Motorsports in the USA i'm getting better CP Pistons on priority freight this week for no extra cost..

They forgot to mention that wisecos wouldn't be available until mid to late August.. I need to be built by then !!

[karl_2ltgc]

Nice one. Glad this car found a good owner for it

[Anchor]

Fuck yer finally !!




:D:D:D

[SigmaT]

Looking good mate.

I have Eagle Rods and CP pistons in my 4G54, the weight difference between a standard Mitsubishi piston and a CP piston is incredible.

[Anchor]

Thanks for the kind comments guys




Been doin a bit of fiddly shit.. Waiting on engine shop to finish boring and balancing.... Hopefully pick it all up tomorrow lunchtime and start grinding the block to clearance the crank.

Then put the bottom end together


Also got another set of shims put under the valvesprings so they meet the required specs for the cam. Had to make sure they wouldn't coil bind etc etc also. So should be all good for a 7500rpm limiter (normally could rev higher, but stroker changes things..)

[Anchor]

Getting there... Should have motor ready to go into car by friday if everything goes to plan. Then its just all hook up and go.

Nothing fouled with the stroker, will just have to put washer under the oil squirters maybe..

Gapped the rings today to CP's specs and done a shitload of cleaning. Tomorrow should see the bottom end together fully and the head on

[Anchor]

Closer....

Had to modify / fix a few small things as usual lol.

[81GL]

Loving it...

Keep the pictures coming

[Anchor]

Allmmoooosssttt......




Good part is, it's all plug and play from here