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Wax,s 260z 2+2 long term build


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#1 waxhead

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Posted 20 May 2009 - 07:27 PM

OK well here is my thread of my 260 build up

It was going to be an rb30det but looking around i see they are getting big power out of the l28 turbos
so i have decided to stay period for the car

I brought it off a fellow member here and it seems to be in reasonable condition.
Got a few areas IE under the dash that i need to fix the rust in but nothing to major
I am sure the owner before me didn't know about that so its all good

Anyway I don't have much room in my garage at the moment on account of jetskis and other toys in the way so i decided i would start on the engine at work
Mainly the manifolds
Its common knowlodge that a plenum should be about 1.5x engine cc which means my one should be 4.2 litres
Its not hard to look at the stock injection manifold and see that its no where near that.
So out comes the alloy cut off saw and we have this.

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#2 waxhead

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Posted 20 May 2009 - 07:30 PM

This is what the manifold will look like when i weld it back together
Of course it will have all the holes filled and the casting cleaned up
When its all cleaned up and run over witht he cardtridge roll i will take it and get it sand blastered
I want to have the sane cast look on the whole manifold so it looks like an aftermarket system
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#3 waxhead

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Posted 20 May 2009 - 07:31 PM

That picture doesnt make it that clear but i will have it welded up soon and it will make it clearer
I have the exhaust flanges off being cut by the waterjet guys  and i will start my exhaust manifold as soon as i have finished the intake

#4 RB30X

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Posted 20 May 2009 - 07:42 PM

Wow, nice work. Your either going to need a reeeeeeaally wide throttle body or do something about the throttle body flange.


#5 Lurch ™

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Posted 20 May 2009 - 07:45 PM

Looks interesting.

Oh & please fill in your location!

#6 waxhead

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Posted 20 May 2009 - 07:55 PM

oh yes the throttle body
how does something like this look
http://cgi.ebay.com/...2|39:1|240:1318

#7 Neuby

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Posted 20 May 2009 - 08:06 PM

It'll be interesting to compare the different approaches to manifold design that have come up in project journals.

#8 garvice

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Posted 20 May 2009 - 09:20 PM

I'm subscribed, looks very interesting. Will be good to have another Turbo Lseries in Queensland.

#9 waxhead

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Posted 22 May 2009 - 08:16 PM

Ok well got in there with the porting tools

when i started i couldnt fit a 32mm ball bearing down there now i can roll a 35mm one straight down there

I also cleaned out the short turn alot so that its a more direct flow

Im very happy with the result

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the pictures dont show it as well as it should, but you get the idea

I have started to clean up around the outside of the manifold , the casting marks will all come off then i will take it down and get it sandblasted to give it that sand cast look again. My goal is to make it look like an aftermarket  manifold and not a hand fab job

The flash off the camera takes awy from my porting work, i will try and get some better ones tomorrow

#10 waxhead

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Posted 22 May 2009 - 09:01 PM

Ok how is this

Its a bit darker but you get the idea more

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#11 waxhead

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Posted 24 May 2009 - 06:55 PM

Well did some more work over the weekend
Hopefully i will have the manifold welded up this week
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Stripped down the spare l28 that came with the car today
all cleaned up enough to go in the back of the car now
Will go off to get hot tanked this week

#12 zzzzed

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Posted 24 May 2009 - 07:02 PM

nice sox dude :P good work with the manifold to



#13 waxhead

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Posted 24 May 2009 - 07:27 PM

Thanks
They are my favourite socks

Im happy with the way the manifold is coming along. Hopefully when its all welded up it will look as good as it does in my head

#14 .

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Posted 25 May 2009 - 07:12 AM

hope they are steel capped sox. :P Can't wait to see the finished product.

#15 waxhead

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Posted 25 May 2009 - 05:30 PM

Ok having a look around i saw some other manifolds other people had made and i like the way they flowed them into the front cylinder.

I could see a shortcoming on my first design

So i changed it a bit today, I think it will look alot better and should flow alot more as well.

Of course it needs to be welded up and its just held together with tape at the moment.

Hopefully i will get it tacked together on wednesday and then will make the plates to over all other holes. Should be excellent when finshed



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#16 waxhead

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Posted 25 May 2009 - 07:31 PM

Man easy I am a kiwi. A thong is something my wife wears
The Jandle is is something you wear on your feet or use to prop up unwelded intake manifolds.

#17 luvemfast

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Posted 25 May 2009 - 10:32 PM

Ay, nise Jandles Bro  ;D

Looking good
Would reconsider putting your entry too close to the first port.
Have a look at the flow works on the second page, this was for a n/a at about 4,000rpm
http://www.viczcar.c...pic,2523.0.html
I've been thinking of resurecting that project now I have a turbo exhaust manifold.

#18 waxhead

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Posted 26 May 2009 - 07:14 AM

Its seems a fair way off the front on the throttle body
But i see your design and its further. Im not getting to stressed about it , The flow is going to be far better than the orginal and since its going tbe force feed i think it will flow enough to reach my goal of 300 to 350 whp
Thahks for the comments

#19 waxhead

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Posted 27 May 2009 - 08:54 PM

Well got the manifold all tacked up today and have to blend the old body in to the new plenum

Then its a case of welding it all up and making a top and bottom plate and then manifold is finished

On the bottom plate i will weld a thicker plate so i can put in the map sensor and vacum fittings
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oh i wore my socks to keep every one happy as well





#20 waxhead

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Posted 28 May 2009 - 04:57 PM

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this is the manifold with the side panels on

Well sitting in there anyway

Its almost ready to be welded shut now





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