Turbo Conversions

[crooser]

because the gearboxes between NA and Turbo are different...

hence a lot more little things need changing.

If the NA gearbox could be retained (i dont know how long it would/could last)

theoretically, you could just unbolt the engine from the gearbox, unplug all the wiring and accessories and undo the engine mounts and lift the engine out. replace it with det engine (using your old NA engine mounts) swap the ecu and fuel pump with ones from a 25det. rig up the intercooler and drive away...

i suggest you try and find out if keeping the r33 NA gearbox isnt a crazy idea first - could save a lot of money and extra work.

I was lucky to have DamqikGTST who lives only a few doors down offer his help (wouldnt have attempted it without him).

It wouldnt take long to do in a workshop with a hoist etc

[doxximus]

well i changed my n/a gearbox to a turbo one just to be on the safe side and yes i've been told that the n/a r33 gearbox is similar to an r32 gtst box

[GtSkylinePeTe]

How mich was the finnal cost?

[crooser]

at the end of the day, approx $3700 i think.

It will really depend on what you can get the motor/box for.

heres a pic of both engines and boxes

[funkymonkey]

is that with or without installation costs?

[crooser]

we did it ourselves

[geordie]

Ok back to the topic of supercharging(sorry to interupt) funkey monkey put forward this conversion.the easiest supercharger to bolt on is the Toyota 1GZE SC. Its made for a 2.5L straight 6 (or was that 2.0L) the only thing you have to do is get a custom manifold fabricated. Smack on an GTR intercooler and a cold air intake and you've got a 50% power increase.

would anyone have a rough idea on what this would cost.....can get a decent sized fmic for like 500 so what would the other prices be??

[funkymonkey]

lol that's exactly what i was gonna do (b4 i decided to get the GTR)

manifold costs about $800 to fabricate from scratch. Supercharger costs about $250 from a local wrecker. Intercooler will set you back about $800 or so for a GTR intercooler. Add about $500 for labour and piping. and ther's ya supercharged skyline, ready to much stock GTSt's 4 breakfast

[funkymonkey]

neoGT-25

jus readign back... u sed insurance stopped u from turbo'ing... i think insurance companies stop you from forced induction... which includes supercharging.

[geordie]

So for like 2g or a bit more you could have a mad sc skyline....thats awesome, would the computer or anything like that require work?? what sort of power increase would that achieve??

[geordie]

oops i re-read the post a 50% increase.sorry, still would like to know about the computer thing, and what about the internals how will they take to a supercharger??

[funkymonkey]

an SC like the 1GZE SC wouldn't affect the internals mucly, its like putting the stock turbo on a GTSt onto the engine, its sorta built to withstand it. As for exhaust n stuff, you'd have increased back pressure, but you don't new headers or anything, coz its a sc

[Nismodified]

hey funky, regarding the supercharging

how well does the actual unit fit into the engine bay?

do u require any mods to the bonnet.

[funkymonkey]

you need to relocate the airconditioning system, that's about it. doesn't take much. One of my mates who's a mechanic drew up a diagram where it goes almost in the same spot as the turbo, its feasable... i'd scan it but i dunno where i put the scrap piece of paper.

[geordie]

pleas find it coz I'm real keen to investigate it

[ninjadust]

it does sound like a more unique option and a bigger "WOW" effect ......

ok .... so we've heard all the "goods" about sc option, what about the down sides to the sc option???apart from costs.... will the engine deteriorate faster then a turboed car, cos its not really made for forced induction?? or are the extra stresses put on the NA engine still within the NA'z limits???

also back to the gear box disscussion....... i gots an 96' R33 ser.II GTS4, hows the gear box in those cars??.. are they the same as the RB25DE(RWD) n RB20DE????.... i just thought being a 4WD car it might be stronger???? maybe?? i dunno????

[ninjadust]

Originally posted by funkymonkey

...............As for exhaust n stuff, you'd have increased back pressure, but you don't new headers or anything, coz its a sc

so does this mean u might need to down size the exhaust???

sorry if this sounds like a stoopid question.......my bad:rolleyes:

[ninjadust]

heheh.. while im on a roll...

no compression changes need to be made to the engine when opting for the SC upgrade????? is that right????

[funkymonkey]

dunno about compression changes, I gave up investigating it when I decided to buy the GTR...

No what I meant is, as the SC setup didn't affect the way my extractors worked, (Ie have exhaust run thr the turbine like a turbo) I could keep the extractors that I already had. I already have aftermarket Fujitsubo extractors on mine worth about 1.5k so I'm not too keen on gettin rid of em. Hence why I was lookin at SC's coz they're less complicated and need less modifications than a turbocharger.

If you really want, buy my car and I'll help u supercharge it

[funkymonkey]

u might need to upsize the exhaust, just like if you were puttin a turbo on.

A supercharger does the EXACT same thign a turbo charger does, except a supercharger is driven by a belt attached to the engine, and the Turbocharger is driven by exhaust gasses spinning the turbine.

Everything else is the same, you still need an intercooler to cool the air b4 induction (altho on an SC its not essential), and you still need a bigger exhaust to get rid of the increased byproducts of combustion.