I was just wondering if I needed to cert an engine conversion it was a rb25de now running a rb20det, a couple of years ago it did not need one as it did not increase the power by more than 20%, is this still the case or has the rules changed TIA
jasongroves,
May 10, 7:19pm
Yes you will.
carmedic,
May 10, 7:29pm
The 20% increase of power only relates to modification of the OE engine not substitution of the OE engine. So yes you need LVV certification.
hounddog2,
May 10, 10:22pm
Just the fact you have added a turbo means you need one you will atleast need two drive shaft loops and a catalytic converter
pollymay,
May 10, 10:33pm
When did they start making you put cats on! I didn't and would of gutted them anyway, the emmisions testing is a joke really.
jono2912,
May 10, 10:39pm
What's a driveshaft loop and it's purpose! (just curious)
pollymay,
May 10, 11:17pm
Watch mythbusters! To stop the driveshaft after breaking digging into the earth and doing some serious damage or death as it tries to pole vault the car as it crashes through the fuel tank. Likewise if the break at the rear they flail around and try to fire out from under the car at however many rpm the gearbox output was at and bouncing, spinning and twisting a 100mph piece of heavy steel. I don't even "have" to have 2 on the old dirt track cars and I do cause it's pretty important.
hounddog2,
May 10, 11:23pm
Reason being that he will need two is because his drive shaft has two uni joints
pollymay,
May 10, 11:34pm
I'd put 3, driveshafts can do serious damage to underbody as well as break the tail off a box if they break and get a good whip on, guess you could do 2. I'd do 3 though, my 2 cents
bubbles244,
May 11, 7:28am
no no and no. the drive shaft is the same as the turbo model and the cats are not required as my Rb30det had certed 4 inch lake pipes with no cats and no restrictions, just cheese grater turbo flow mufflers.
phillip.weston,
May 11, 8:22am
you do need cats now, but only if both the car AND engine you are certing had cats. Ie putting a RB25DET into a 1970s Datsun, a cat isn't required. Putting a 350 chev into an RX7, a cat isn't required also. But putting a RB26DETT into an R32 Skyline, yes a cat is required. But the check is only visual, so the cat could infact be gutted. They do an emissions check, but it is very relaxed and just about anything passes.
hotrodtodd1,
May 11, 8:44am
Yes, if you turbo a vehicle which was not previously turbo'd, it must be certified regardless of the change in horsepower.
I just added a factory Chev turbo to my 6.5 Chev diesel engine and contacted LVVTA who advised that ALL turbo conversions need a cert - even slow old diesels
phillip.weston,
May 11, 8:58am
^^ yeah it's more if the 'induction' has been changed, ie going from naturally aspirated to forced induction, whether it be a supercharger or a turbocharger or even both.
hounddog2,
May 11, 10:27am
Also doesnt matter if its the same drive shaft it still needs the loops ! (within 150 mm of the universal joints )
A broken driveshaft dragging on the ground can cause a car to pole vault end-over-end if it strikes a pothole.
partly busted
A car cannot be made to go end-over-end by striking a pothole with the driveshaft. The back end of the car can be lifted, but the likelihood of an event like this happening is extremely improbable. More likely is that the driveshaft would be forced into the trunk.
pollymay,
May 11, 12:04pm
I think a driveshaft break was the cause of a rollover at our club once, halfway round a corner then bang, pop, lift, tip, round and round we go. Driveshaft hoops are kinda big deal. Especially modern ones with rubber dampners that can break with age/abuse then you have a piece of shaft that shockloads itself which can shear bolts.
phillip.weston,
May 11, 1:30pm
Are you confusing driveshaft hoops with driveshaft hanger bearings!
On which bit! The dampners! Cause I've seen rubber dampners as part of the actual driveshaft, it's like a sandwich arrangement usually, once it goes floppy though it means the shaft can twist then bang it hits the max shear of the bolts then bang the bolts shear then bang it drops on the ground.
I was just meaning the actual driveshaft and rubber not hangers on dampners.
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