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Engineering Question

12DFY

By 12DFY,
in Victoria

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12DFY Collaborator

12DFY

Posted
Posted

Hey all, have done an R33 GTS Auto to RB25DET and manual gearbox, my question is with the brakes. I have to upgrade to GTST brakes, but to get it legally engineered do I need to go to the 5 stud bolt pattern or will the 4 stud suffice as long as calipers are changed?

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https://www.sau.com.au/forums/topic/205121-engineering-question/
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R32Big_boy Veteran

R32Big_boy

Posted
Posted

Calipers cant be changed without hubs, the bolt holes don't match up i believe.

Also disks wont match the calipers width.

So you need hubs with 5 studs to fit those calipers. Its not the worlds hardest job, as long as you have a breaker bar of some description. ie gal pipe.

ylwgtr2 Grand Master

ylwgtr2

Posted
Posted

it is my understanding that if a certain engine was offered in the same body from the factory then you dont need an engineers report.... IE 6cyl->350 chev in a HT kingswood or say changing a deisel gemini to a 2l gasoline engine its not required....so i cant see the diff

CrispyFries Grand Master

CrispyFries

Posted
Posted

This is the reply I got from vicroads when asking about a ca18det into a ca18de silvia for my gf

Change of Engine

1. Replacement engine is identical to the original engine, or is an

option allowed by the manufacturer for the same model vehicle

The optional engine must be offered in Australia by the vehicle

manufacturer as an option for that vehicle (or certified variants). The

change of engine may be recorded by VicRoads provided that the

registered operator or a motor mechanic, or dealer in that make of

vehicle or an Automotive Engineer signs a declaration certifying the

engine is optional for the vehicle model, and that all modifications

made by the manufacturer for the same vehicle model with that optional

engine, have been completed.

But then as a silvia was never offered in australia so...

But sounds as though an engineer at least has to look at it

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Engineer will need the brakes done, about the stud pattern, you'd need to ask the engineer that

Being its an import - VicRoads will send you to an engineer 9 times outta 10 as they dont want to pass judgement on imports etc.

If it was a AUS car - piece of piss, but ye. Imports are a pain for that

12DFY Collaborator

12DFY

Posted
  • Author
Posted

Thanks guys, I believe the bolt patterns should line up for the calipers, will guess I will find out soon enough. The main reason I ask is that I really dont wamt to get new wheels as the ones on it are quite expensive. Im going to have a hell of a time here in Vic as I have just come from queensland, and compared to Victoria the modification rules are seeming to be very strict. Eg my inlet alone has PWR front mount FMIC, Pod Filter, modded plenum and aftermarket BOV. And the ECU, well I guess I will have trouble transfering rego etc.

How strict is a roadworthy on modification issues, are they concerned with mods or just the safety aspects alone (hence the safety cert)??

SABBAi Grand Master

SABBAi

Posted
Posted
the engine number prefix is the same....so i would simply fit the engine...then go to vic roads and have them sight the engine number....then thats it...obviously change the brakes for safety's sake...

This is how we got an N/A car registered with a turbo motor.

STATUS Grand Master

STATUS

Posted
Posted
Yeah I reckon so.

if he has insurance and wants to keep it he has no choice.

im the worlds biggest fan of moving plates and numbers around but somethings things need to be done corectley :/

ylwgtr2 Grand Master

ylwgtr2

Posted
Posted (edited)
if he has insurance and wants to keep it he has no choice.

im the worlds biggest fan of moving plates and numbers around but somethings things need to be done corectley :)

Who said anything about moving plates and numbers around?????Vic roads dont have anything to tell them a vehicle has forced induction.

An engine block is an engine block and the numbers say that its an RB25 so wheres the problem?

Edited by ylwgtr2

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