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Rb20 Gearbox To Rb30 Engine

cole6985

By cole6985,
in R Series (R30, R31, R32, R33, R34)

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cole6985 Apprentice

cole6985

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Hey guys. Just wondering if any of you could tell me if the VL starter motor would hook up to an RB20 box or would i need to get an RB20 starter motor? I'm doing my first real car so im pretty new to all this but im learning as i go. I'm also after a clutch fork if anyone knows where i could get one or has one for sale. I've also heard from a few people that the RB20 box will be no good on the RB30 but seeing as i found this out after i bought the box, i was thinking i would stick it out with the RB20 box and see how i go. Is it worth doing this or should i just cut my losses and take the RB20 box back and pay the extra $900 for the RB25 box? Thanks guys.

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mad082 Grand Master

mad082

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is the VL natro or turbo? if natro it should be fine. if it's turbo, as long as the rb20 box is from a turbo rb20 then it should be fine also. even if the box is from a natro rb20 it will more than likely be fine as well.

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cole6985 Apprentice

cole6985

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I'm pretty sure its an N/A motor converted to turbo. The turbo is drained to the block but the guy i bought it off said it was N/A converted to turbo. It had the N/A injectors but i've bought a set of 434cc GTR injectors. I've had the whole engine reconditioned, would i be better off to start it for the first time with the N/A injectors or will it be right to just go straight with the GTR ones? The box is from an RB20 turbo.

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bubba Grand Master

bubba

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I had my RB20DET gearbox bolted to my twincam 30, I used the RB20 starter motor though so not sure if the RB30 starter will fit.

The RB20 gearbox won't live for very long behind a 3L..

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cole6985 Apprentice

cole6985

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Yeah thats what i've heard too. I dont drive too crazy but im gonna want to give it a bit every now and then. I also bought an RB30 clutch kit cause it was cheap as on ebay and then i ended up getting an RB20 box. Will the RB30 clutch fit the RB20 box?

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mad082 Grand Master

mad082

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I'm pretty sure its an N/A motor converted to turbo. The turbo is drained to the block but the guy i bought it off said it was N/A converted to turbo. It had the N/A injectors but i've bought a set of 434cc GTR injectors. I've had the whole engine reconditioned, would i be better off to start it for the first time with the N/A injectors or will it be right to just go straight with the GTR ones? The box is from an RB20 turbo.

it comes down to what the ecu is expecting the injectors to be. if it is a natro ecu then it will start on the natro injectors, but i highly doubt it will on the GTR injectors, and if it does, it won't idle for long before it stalls since rb20e injectors are only 185cc from the info i can find, so with the GTR injectors it would be putting in well over twice the fuel. ECU's don't automatically know how big injectors are, so if you put in bigger injectors it will put in more fuel. if you want to use the GTR injectors straight away then you will need some form of aftermarket ecu (whether it be a piggyback, remapped ecu or aftermarket such as a PFC, etc) that allows you to alter the injector size.

that said, if it is a turbo ecu and NA injectors then it won't start that well, however probably still better than with the GTR injectors.

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cole6985 Apprentice

cole6985

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I just bought a Manual RB30 Turbo ECU with a stage 3 performance chip, will this run the GTR injectors better? Also what size are the O-rings on the standard GTR injectors? Are they 14mm or 11mm? I think i might need to buy a new fuel rail but i dont know which one i need.

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mad082 Grand Master

mad082

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unless the ecu was tuned for GTR sized injectors it will be no better than the stock ecu. also what sort of chip is in the ecu? is it one of those powerchip type ones that you can't tune? if so, they are a major waste of time and money. if it is something that has been tuned by a tuner and you can have it retuned then you should be able to take it to a tuner and have them simply change the injector size to the GTR size in the settings (depending on ecu setup) and then you will be able to atleast run the car, however you should still get it fully tuned once you have the car on the road as you may end up damaging the motor if the tune doesn't suit your car.

generally "stage X" stuff when it comes to ECU's are a load of crap. they are usually just generic tuned stuff and won't give the power gains of an individually tuned ecu, since it will be done specifically for your car. if you walk into a workshop and asked a tuner to give your car a "stage 3 tune" you'd find that it is more than likely the exact same tune as you would get if you asked for a stage 1 tune, lol. a tuner simply tunes an ecu to be at a certain AFR and timing that isn't going to make it ping.

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