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bart from mivec.co.nz wrote:This is a basic guide to the parts you will need if doing a 1.8 Hybrid.

Block
4g93 DOHC turbo block has oil squirter's for the pistons, all other 4g93 DOHC/SOHC don't but all will fit the 4g92 mivec head.

Crankshaft
4G93

Rods
4G93

Pistons
4G92 Mivec or Custom to suit desired compression ratio

Headgasket
Head gasket is 4g9x from .5mm (standard gen2 mivec) to 1.5mm(fibre/carbon fron gen1 and GSR)
A 2mm copper/custom gasket is needed to bring CR down to 11.0:1 in a 4g93 with 4g92 mivec pistons.

4g93crank + 4g93 rods + stock piston - 4g93 block height = 0mm
4g93crank + 4g93 rods + mivec piston - 4g93 block height = +1mm
There are high compression 4g93 pistons in a GDI that may work but they maybe 12:1 already.

Cambelt
4G94 159 tooth is perfect

Gearbox
Factory 4G92 Mivec Gearbox
Clutch & Flywheel: Factory 4G92 Mivec

ECU
Minimum is a piggyback but a full aftermarket recommended for optimum performance.

Injectors
390cc (from GSR Turbo)

Notes
Nothing 4g6x fits other than the spring shims in the head and injectors. Gaskets and fuel rail etc have different bore spacing and sizes.

A hybrid turbo will be a GSR bottom end with mivec head and longer belt, so much simplier than building a NA.

MISHI wrote:I should also note the few I've read so far have blown their motors...

Replace the standard head of the motor with the head from a 1600cc Mivec this will give you the ability to have Mivec turbo (we have all seen VTEC turbo kick ass, why not try it). The Mivec head will bolt straight on to the turbo block; obviously you will need a new head gasket, cam belt and cam belt tensioned though. This would be a good way to get rid of the typical Mitsubishi death rattle (noisy lifters)

The above gives you a whole new area of development to play with, bigger valves, cam timing etc.

The head alone will not make much difference till you have some form of RPM switch to control when the cams change profile/lift etc. For this you could use a $15 RPM switch from Jaycar electronics, which will simply turn the Mivec on at the desired rpm. Alternatively you could use a Field type Vtec controller ($500ish) with adjustable fuelling etc, similar to an Apexi super AFC ($900ish) this will also help you to set up the correct fueling. Or if you wanted to go the whole hog you could always get a link computer or similar

fras wrote:

MISHI wrote:I should also note the few I've read so far have blown their motors...

Thats not cool dude


The boost on the stock turbo starts falling off at 6000rpm... Would the mivec make a difference for the other 1500rpm till red line?

Would really like to see if and how much more power a stock mivec head would make... Tuned at stock boost

Imagine getting full boost at say 3000rpm, then mivec engages at 5000rpm