Jump to content
Sign in to follow this  

boosted300's RB 240Z

Recommended Posts

The previous owner for some reason used bolts for the exhaust manifold rather than studs…


for those that have had the unfortunate experience of stripping a head, it was not the best decision.


A trip to the Nissan dealer and consultation with a friend who is the parts manager there yielded me some very nice exhaust studs that were exactly the right size, from a Sentra of all cars.









And everything buttoned up with ARP of course...



Share this post

Link to post
Share on other sites

Throughout all of this, chasis integrity has always been in the back of my mind.


In fact, I have the Chasis prep thread on my favorites toolbar.


Ultimately I want to install a roll cage, but in the meantime The car only has a strut tower support in the rear and a triangular version in the engine compartment.


Here's the front strut brace from an early pic...





Knowing that I was going to be making more power in the future, I knew this obviously wasn't enough.


Since the roll cage is a down the road goal, I felt the most bang for the buck I could achieve in chasis reinforcement for the time being were frame rails.


I mean pretty simple...just weld 'em on right?




Share this post

Link to post
Share on other sites

I quickly discovered how much fun it is not to scrape off undercoating.


In the process, I discovered the mortal enemy of early Z cars...rust...on the rear edge of the passenger side factory "half" frame rail.


This was not only surprising, but disappointing in that the car had been advertised to me as a "rotisserie" and had no miles on it to have developed this much rust, this fast...deeeeeep siiiiiiigh.


Hoping that it was very minor I began chipping away...and soon it was apparent that it wasn't really minor and extended under the factory rails.


I got a mallet and began banging on the rail and could hear the sound of what I was sure were rust chips rattling around inside....ugggggh.


We cut the piece off to get a better look...




Sure enough...



Share this post

Link to post
Share on other sites

Again….you are never complete until you modify your modifications…


The frame rails are not “Bolt on” and we had to do some work to get them to fit right.


Doug cut some additional grooves in the rails to allow them to flex and follow the curve of the existing frame rails toward the front of the car.



Share this post

Link to post
Share on other sites

Welding them in...(while a fellow HybridZ watches in the distance)










And for safe measure...some Eastwood internal frame rail coating...







And a quick coat of Eastwood rubberized undercoating to finish it off...





That project ended up being far more of a mission than we anticipated! But it had to be done.

Share this post

Link to post
Share on other sites

Back to some more fun stuff...


Because we put the condenser in, it meant that the McKinney intercooler would have to move forward a bit, however with the slope of the hood, the clearance was already next to nil...this would mean moving the intercooler down a bit as well, meaning the inlet and outlet would have to be cut and re-angled...


Rather than go through that, I decided to go with a whole new unit.


After measuring, re-measuring, measuring some more...and then measuring again (like 6 more times!) I came up with an overall size that I felt would work.


I searched on the net extensively for an existing unit that would work, but I couldn't find anything I was happy with. I went at this for months while the other projects were being worked on until I finally decided to just fabricate a custom unit.


For anyone who's ever done this you'll know what I mean when I say it's not nearly as easy as it sounds.


Measuring, measuring, measuring, brainstorming, more measuring, experimenting...did I mention measuring? and changing directions and concepts at least 5-6 times.


I went to Treadstone and experimented with all sorts of cores and end tanks looking for just the right combo...





















Share this post

Link to post
Share on other sites
Posted (edited)

After literally months of this...I decided to go with a core from Bell, and some customized end tanks.


Now these days, the Chinese have changed the market producing almost anything for automotive performance at hard to believe prices.

Entire intercooler systems can be had for $500-$600.


I almost pulled the trigger on a CX Racing unit that was close to the specs I wanted...but just not close enough.


Bell cores are not nearly as inexpensive...but I chose Bell not only because they make top of the line heat exchanger cores...but also because they do it in practically every size imaginable...literally.



Call me crazy, but damn I don't know what it is about an aluminum heat exchanger that I find so sexy!




I went with a core that was shorter than the Mckinney, but longer and wider to make up for it...







Edited by boosted300

Share this post

Link to post
Share on other sites

The wastegate flange that came on the tubular header was not only the wrong shape for the Tial, but we felt it was too small to effectively control the boost and would cause some creep.




So what did we do?


Modify the modification of course...




We cut the existing flange off...




And then carefully drilled out the opening for the new diameter tubing...





Share this post

Link to post
Share on other sites
Posted (edited)

Even though I loved the golden tint of the tubular manifold, I realized that


1.) it wasn't going to stay that color


2.) There would be a lot of heat generated by it, in a very confined space


So I opted for Jet Hot coating that offered a nice middle ground of heat shielding and appearance.







Edited by boosted300

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this