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Old 23rd May 2011, 10:25 PM   #1 (permalink)
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R34 rear diffuser refurb

We all love a bit of carbon. Unfortunately when Nissan put a lovely big sheet of it under the R34, they must have run out of money for decent nuts, bolts and hangers, because they rust away.

I thought I would share my refurbing antics for anyone else with rusty bits

This is what I started with.


Rusty hanger (this was the good one, the other side had vanished)




I soaked all the nuts and bolts with WD40 for several days and then undid them... every single one snapped!

Anyway I stripped the diffuser down.


My one and only bracket that I would use as a template to make new ones.

The straps that the centre fins attach too.

Snapped bolt!

Diffuser rubbed down gently with 1200 grit wet and dry


The carbon fins were looking very tired too.


Gave the plastic side bits a rub down.


I then got some cardboard and made a template of the hanger.

Bit of angle grinding later...


Matching pair.


Test fit.



Rubbed down and re-laquered the fins and diffuser tray.

The keen eyed among you will notice that this is the wrong bracket... should be on the other side. Just as well I did a test fit before I out it all together properly.


De-rusted and treated the metal work.


Then painted it all with POR-15



I then put it all back together using stainless steel hardware.



The few original bolts that attach the whole thing to the car that were re-useable I soaked in Bilthammer for a few days then painted with Hammerite satin black for some protection.


Finished article!


Well nearly... the aluminium jacking point that goes in the middle is putting up a fight. All the bolts snapped, of course, and because they are mismatched metals the bolts are well and truly welded into the aluminium. I have tried drilling one out, but it started to get ugly as I don't have a pillar drill. I will get my wife to talk to the DT teacher at the school were she works and see if he will do it.


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Old 23rd May 2011, 10:27 PM   #2 (permalink)
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Brilliant work there..
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Old 23rd May 2011, 10:35 PM   #3 (permalink)
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Anyone with a split in your splitter... make friends with a car windscreen fitter.
Had a new windscreen fitted, just happens the guy is a Skyline enthusiast and owns an R34 GTR, what are the odds!
Does an amazing job on the windscreen and then fixes the splitter, that I had previously been told couldn't be fixed. Windscreen glue is the stuff.



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Old 24th May 2011, 06:47 AM   #4 (permalink)
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awesome stuff,and something that I need to do to mine over the summer..
the other diffuser hanger bits,did you re-make them aswell,or just cleaned them up properly? Seems like you just cleaned and re-used??

Loving this thread though,did you happen to get more details of the windscreen fitter's R34 GTR
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Old 24th May 2011, 06:56 AM   #5 (permalink)
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Awesome stuff Clive mate! Brilliant to see your BNR34 getting some proper good TLC.
Top tips, cheers for sharing!

Bob
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Old 24th May 2011, 04:40 PM   #6 (permalink)
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Thanks Bob, high praise indeed.

japfreak786, yes he has a very nice white R34. I told him he could have a good sideline in fixing splitters, but he didn't look keen! That's why I haven't named him.

He is on the forum though... you know who you are!! Cheers bud.
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Old 25th May 2011, 02:40 PM   #7 (permalink)
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Great thread and a great job done!
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Old 26th May 2011, 09:32 PM   #8 (permalink)
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well done what brand was the windscreen glue you have use for the splitter?
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Old 26th May 2011, 10:54 PM   #9 (permalink)
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The windscreen glue is a great tip... where can I get some? I'm having my bumper painted and Nismo style underskirts fitted at the moment So my splitter is off and it needs a few repairs..

My rear undertray has been on and off so many many times during my ownership and I've always, pressure washed it, and spray greased all the bolts and hangers, so it's still pretty good and easy to get on and off.

Top job on the refurb I think those carbon fins might be aftermarket or a factory change, mine are only ABS

I guess the moral is anyone with a VSpec who hasn't removed the rear tray... Get it off now and start looking after it...
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Old 27th May 2011, 12:04 PM   #10 (permalink)
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It was National Windscreens that fitted it and it was the thick black mastic stuff that they use to seal the screen in with. I don't know a brand I'm afraid. As I said, make friends with a windsceen fitter.
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Old 27th May 2011, 12:21 PM   #11 (permalink)
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I wonder if the mastic is similar to Sikaflex? Thats awesome stuff!!!

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Old 27th May 2011, 12:34 PM   #12 (permalink)
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I hope to have an answer soon, I've sent a text to the man.
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Old 27th May 2011, 02:42 PM   #13 (permalink)
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Quote:
Originally Posted by fourtoes View Post
I wonder if the mastic is similar to Sikaflex? Thats awesome stuff!!!

bob

Yes mate it is.
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Old 27th May 2011, 03:31 PM   #14 (permalink)
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Good work on the rear diffuser and front splitter

Like the idea of using mastic- makes alot of sense.

I recently repaired my front splitter and used bumper repair stuff from Halfrauds, came out really well. Painted it to factory finish and got it looking really nice, only for it to get stone chipped driving down the road. Going to cover it in vinyl now to take the stone impacts.
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Old 27th May 2011, 05:03 PM   #15 (permalink)
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I have just had a PM from Dr Meat, who is the chap that fixed my splitter and I quote:

"The glue I used was made by Dow Automotive but Sika also make great glue. The most important thing is to have the right primer for the glue as without the primer it would come un stuck at a later date,and then the right chemicals to clean up the excess glue,you've seen how many plastic gloves i went through."

Thanks for coming back to me mate and yes we will definately have to take the cars out for a spin.
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Old 27th May 2011, 05:33 PM   #16 (permalink)
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Great work on the diffuser
to save you the hassle of crawling around on the floor any more, you may aswell leave the diffuser off and let me have it
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Old 2nd July 2011, 08:32 PM   #17 (permalink)
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Today I finally refitted the diffuser. I decided to change the exhaust so waited until it arrived before I bothered!

First I parked the car at a jaunty angle with my trusty ramps.






Shiny new exhaust!


Next to the old Veilside titanium one


All fitted and diffused


All done.
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Old 2nd July 2011, 09:11 PM   #18 (permalink)
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Lurve it Clive!!!!

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Old 3rd July 2011, 07:06 AM   #19 (permalink)
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Nice work mate! I wish I have a driveway or garage for me to work on the car...
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Old 3rd July 2011, 08:35 AM   #20 (permalink)
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Great to see such a beautiful car get worked on by it's owner. Nothing beats that feeling of accomplishment. Kudos
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