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Banjo Bolt Thread Sizes

agentx

By agentx,
in Engines & Forced Induction

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The Dan Grand Master

The Dan

Posted
Posted

Ok well that makes sense. You wouldn't have any of the banjo bolts as the TR43 is different. The dump/front pipe and cat SHOULD be all correct. Get the rear section modified by an exhaust shop, it will be easy for them to do.

agentx Rising Star

agentx

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If you have the front pipe bolts tight (3 of them) back them off a little and you will be able to swing it 5 or 10 degrees. The cat on all skylines should have parallel flanges meaning if you stand it on the ground on its 2 bolt flange, the opposing flange should be parallel to the ground. If the cat flanges are not parallel then the cat is wrong. The front pipe should kick in towards the tailshaft right before the end, just like in the picture in that link I provided. If its the stock front pipe then this won't be an issue. I would say it is possible the rear section was modified at some stage and this may be why it doesn't fit.

I had the front pipe on but its off now (stupidly placed on the battery as you correctly pointed out) - with the front pipe on and the stock (not modified in any way) cat connected, the cat was sitting on a 45 degree angle instead of being flat like it should be (so out of the 2 bolts on one side of the cat, one was closer the the ground and other was higher - hopefully this explains it). If that is the case, the stuff after that till the muffler doesn't even matter - why would this happen if I have a stock dump pipe, stock front pipe and stock CAT - the CAT should sit parallel to the ground and not at an angle :(

The Dan Grand Master

The Dan

Posted
Posted

ok so are you saying that if you were to look under the car with it on the ground, the cat points DOWN towards the ground at a 45 degree angle? or the bolts are just positioned so that you have to twist the rear section to make the flanges meet?

Sorry this is taking a while to work out. Mechanic braille takes time lol

The Dan Grand Master

The Dan

Posted
Posted

The cat should be flat on the wide section. The flanges are rotated from the horizontal plane. Have you got it the right way around? Maybe back to front? Look for a sensor hole/bung in the side, it goes towards the rear of the cat and closest to the passenger door.....if that makes sense

agentx Rising Star

agentx

Posted
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Posted (edited)

Thats the problem - right type etc, just doesn't want to get on (and the front pipe also has a bracket that doesn't match up with the bracket on the chassis where the last CAT had a bracket mounted)... I dont see how but I'm thinking if i get the cat back stock exhaust from the wreckers, it should all bolt up - once i get the car running i can think about getting exhaust work done - dont see any other bloody options :(

Actually forgot to add something important - the front pipe is too long as well, if it was shorter, the rear section might bolt on - getting a stock rear section would solve that - but it still won't solve the problem of it sitting on an angle and not connecting to the bracket :/

Edited by agentx
agentx Rising Star

agentx

Posted
  • Author
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last question I have is, which of the two options do I take

  1. bolt up the exhaust till the CAT and drive to the nearest exhaust shop and get them to somehow fit it all up? hopefully it wont be loud as f**k
  2. buy stock rear section from exhaust place and bolt it all up - and then look for cheap exhaust deals

The rear section i have right now is 3 inches with a cannon - is it better for performance to have a stock exhaust with the stock setup or a 3 inch from the CAT back?

thanks for the help man - really appreciate it!

The Dan Grand Master

The Dan

Posted
Posted

Definitely better to have the 3 inch. Depends on how far away the exhaust shop is but I always recommend getting it towed. Imagine all the shit you have just gone through and then get pulled over half way there and they red card you.

I doubt an exhaust shop would have a bolt on rear system for an R32. The one you have is fine, just get it modified to suit what you have or get another cat put in and have the flanges welded on to suit the way it needs to be clocked

agentx Rising Star

agentx

Posted
  • Author
Posted (edited)

Definitely better to have the 3 inch. Depends on how far away the exhaust shop is but I always recommend getting it towed. Imagine all the shit you have just gone through and then get pulled over half way there and they red card you.

I doubt an exhaust shop would have a bolt on rear system for an R32. The one you have is fine, just get it modified to suit what you have or get another cat put in and have the flanges welded on to suit the way it needs to be clocked

Ok so ended up getting an r32 front pipe and voila - straight bolt on. According to the wrecker, there are two possibilities:

1) I got an r34 front pipe

2) One of the r33's came with a front pipe slightly longer than the r32 one.

whatever it is, its all running now!!!!!! The next step will be to make the whole exhaust 3 inch from the turbo back ... but it will need to wait for a few other things :)

Thanks again for your help mate, you've been very supportive!

Edited by agentx

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