3D Modelling & Printing.



Lately I've been spending more time learning how to model parts in 3D, still new so bare with me. It's not a new concept to me, but I am using Fusion 360 mainly now and sometimes a bit of SolidWorks.

I've done some prints in the past, a good example would be the bulk head connector plate I drew up and printed. Had it installed in the car while I waited for the final piece to be laser cut from steel.


And now I'm starting to move onto slightly more detailed designs. Starting of with "remixing" a design from Thingiverse.

4AGE Black Top Velocity Stack -ย

And my "remixed" version, which is basically modified for Silver Top engines instead of Black Top and increasing overall length to 115mm.

4AGE Silver Top Velocity Stack -ย


I than scrapped that design altogether and did one from scratch, increased the radius lip profile and removed the side bracing. The print below was done in ABS and I'll be testing it for clearance and heat resistance. If all goes well, I'll most likely print my final design in ABS. If not, other materials like Nylon and Poly-carbonate are alternative options for heat resistance.




And this is anotherย design I quickly modelled. Main differences being the bottom flange, length adjusted to 105mm and the dimpled internal surface. NO idea how that'll work for airflow, good or bad, but it's fun drawing these and 3D printing them! The idea is from dimpled surfaces on golf balls, and I've seen shops machine dimples onto the back of inlet valves and cylinder head ports.


And this is how the print came out.... About halfway up the velocity stack, the wall was a tiny bit too thin and the dimples were too deep! Not something I was expecting, but I'll learn from this one and make revisions. This print was also done at 300 micron layer height, I think it needs to be 100-200 micro next time.


And finally, this is an airbox/plenum that will mount to my current Pipercross filter plate. Still needs some work here and there, but I'm pretty set on the general shape of it and the inlet is 4.5" diameter. The final product could be moulded from the 3D print and made with carbon fibre, or possible printed entirely out of fibre infused nylon for strength and heat resistance.


More to come!


Toda High Compression Pistons!


Welllll than...... A couple new things in this update, and possibly a second post regarding some stuff I've been 3D modelling for the build.

First up, managed to install this 5V oil pressure sender and input it into the Megasquirt for full datalogging and dash display through Shadow Dash. The tablet mounted using two magnetic mounts clipped to the eye-ball vents. Works very well and has a very strong hold.

It was surprisingly easy to get working, the sender needs +5v, ground and signal return to the ECU. I happened to use the AD6 input on my Megasquirt, and TunerStudio has a built in wizard to configure your sender.


Developed a slight oil leak into cylinder no. 4 so took valve cover off to replace the gasket. Remember to go genuine valve cover gasket! I've had nothing but trouble with non-genuine valve cover gaskets.


Finally bought some new tyres and fresh alignment done! Hankook RS3 225/45 R15.


Received and installed my IL Motorsport bonnet lifts, not sure if I like them yet.


Next up, I had some spare parts accumulating and was able to put together this LED bar kit. It's operated via RF remote control that looks like a bomb detonator, the LED light bar and associated electronics (now enclosed in water-proof case) are mounted just behind the front bar.


Garage Star Coil-on-Plug adapter acquired!


Toda forged pistons!!! They are 11.0:1 compression ratio and +3mm overbore, made from a special alloy with very littler thermal expansion which allows it to run factory Mazda piston-to-bore clearances. Toda also designed the skirt to allow usage of factory oil squirters. I also ordered the matching overbore head gasket from Toda.


Some close ups of the pistons.




Start Up!


This was not a smooth start up.... Ran into a few issues earlier on, car would crank over and sometimes nearly run but never more than than a fraction of a second. Went through and checked through the wiring and grounds, everything was good there, a quick visual inspection of the cam gear and cam lobes to see if they were in the right positions. And a whole bunch of things....

The ECU logs showed consistent sync loss, error no. 31. Something was wrong with the cam/crank sensors. In my particular case it was caused by the crank trigger wheel being installed backwards :P. And I actually did check it earlier on, but checked it incorrectly!



Once I flipped that trigger wheel around, it started right away! Here's a quick video of it, more to come later!


Back Home!


Happy day! Car has been towed back home and first thing we did was remove all the front panels ๐Ÿ™‚ Storing them in a spare bedroom for now, don't want to scratch anything during assembly.


Colour is Audi's Aviator Grey.


The entire engine bay was covered in blankets during the engine install.




Colour looks amazing in sunlight, the Audi paint code has a bit of pearl through it but can only be seen in direct sunlight.


The freshly powder coated radiator and sway-bar brackets fitted up with new bolts.


A quick mock up panel for the engine harness Deutsch bulkhead connectors.


I had the front lip painted gloss black, will be interesting to see how well it holds up from all the abuse it cops ๐Ÿ˜›



Head Unit Relocation 2nd Update.


Received some feedback and discussion on my head-unit relocation last week, and as I often find, I decided to change it up to the better option.

Below are photos of where the head-unit was mounted, I made a custom MDF piece for that spot too.


But it was obvious that the better position would be in the other corner of the boot, and mounted from above. Overall it looks a lot cleaner and more out of the way.

Started off by half removing some of the rear carpet, I than removed the bottom four bolts of the rear parcel shelf cover. Made it a lot easier to run the harness.


Harness fed through and the head-unit case mounted up!


Everything mounted and connected, works just as well as before.



Engine Rebuild – Part 3

Update time!

After I gave the paint some time to dry, it was time to give the internals a wash down. For this I was advised to use dish washing liquid with water, once that was done everything was given a wipe with engine oil to prevent any surface oxidisation.

The crank journals were given a good clean and main bearings installed.

Before the crank can be installed, the clearances need to be checked using Plastigauge.

Once you have the clearances checked and within recommended specifications, it's time to pull it apart, clean and than re-fit using assembly lube.

In the next episode, I hope to have updates on the ring gaps and final assembly =).


Engine Rebuild – Part 1

Hey guyyyyyyyyyyssssss!

My goal has always been to build my bottom end, forged high compression pistons, forged rods and maybe a decent over-bore. As everything with my car, I would prefer to learn and do it myself. So this rebuild is more of a refresh using stock pistons and rods, a learning exercise/practice before I attempt the forged build.

So over the last week I've been slowly pulling apart my spare block, getting it ready for the machine shop. I'm also wire brushing and prepping the block for a fresh coat of paint.

Pulled the head and sump off, and quickly checked the side-to-side clearances, crank thrust and bearing clearances.

Everything out and ready for the machine shop.


Boot Light

Just a quick update, I've installed a boot light and it's amazing! Please excuse the image quality, they were all taken using my phone.

Install doesn't take very long and everything is plug-and-play. Kit comes with a LED mounted on a stainless steel bracket, boot switch and wiring harness.

Boot Light Kit -ย

Photo taken without flash at 9PM.

I also removed my tombstone to give it a quick coat of Plasti-Dip, the surface was a bit too rubbery/grippy for my liking so I gave it a quick wipe with some interior detailing products. Worked out very well ๐Ÿ™‚


Radio Delete

Been wanting to do this post for awhile now. It's been a combination of research and a lot of testing to get to this point. Quite pleased with the outcome but would like to make some changes later on, more on that later.

A few goals I had for this project:

  • Delete radio/head-unit.
  • Keep everything as simple as possible, think minimal.
  • Nexus 7 tablet to display all the Megasquirt gauges via Bluetooth.
  • GPS with offline maps, pause/resume music on power off/on, wired tether to phone.
  • Maintain charge with full brightness, GPS, music and gauges running.
  • Easy to remove tablet from the car, one cable to dock.
  • Amplifier install that is compact yet has tone controls (bass/treble).

To make it possible for the tablet to dock with just the one cable (USB), and not have to plug the headphone/Auxilary cable in as well, I had to use the tablet's USB OTG Host feature. This basically allows you to plug heaps of USB devices to your Android device, keyboards, mice, thumb-drives, USB DAC, etc...

However, while in OTG Host mode Android doesn't allow the tablet to be charged at the same time. This is where the software comes in to make it all possible. Check out Timur's website for details on his custom built ROM. It is optimised for car installs and enables charging while in USB OTG Host mode, deep sleep mode when power loss is detected (huge power saver), and hot-plugging of audio devices.

You will also need a USB OTG Y-Split cable, I picked up mine off eBay for not much money. While you're there you'll also need a USB DAC, again very little money for these. The USB DAC basically plugs into the tablet via USB and outputs sound for the amplifier.

We're very lucky with Megasquirt when it comes to Android software. MSDroid allows tuning as well as gauges, still in the beta with a new major release soon. ShadowDash is by the same creators as TunerStudio and is a lot more stable but only allows gauges and no tuning features.

For amplification, I decided to go the DIY route. This consists of a pre-amp so that I could have bass and treble control. For the power-amp stage I picked a DIY kit that is built around a IC chip that is commonly used in car radio.

Took me literally under ten minutes to build the power-amp, pre-amp took a bit longer. I than stuffed them both into a plastic case with the USB DAC. The case was picked up from JayCar.

Sound wise, this combo worked very well. The pre-amp gave me plenty of tone adjustments and power-amp was able to keep up with the volume levels I usually listen at. But it did suffer from a "pop" noise on power up, and I may have blown the IC chip because of insufficient heat-sinking!

So the other option I'm look at is this little amplifier, Pyle PLMRMP1B. It's very compact, plenty of power, remote gain control and anti-thump turn on. I'll re-use my current DIY pre-amp though, need those tone controls!

My initial install of the tablet wasn't very successful. Couldn't use my hazard/retractor buttons without removing the tablet, very flimsy, and blocked both centre vents.

I than found a company called ProClip that produce a Nexus 7 holder that was perfect for my requirements.

I used a custom made radio panel, available through my store, and made it a complete blank. This would allow me to hard mount the ProClip tablet holder. Very happy with the qualilty from the holder, sturdy and easy to dock/undock from the car.

For the wiring part, I used new connectors. 4-way connector for the outputs to the speakers, and a 3-way connector for ground, accessory and constant 12V power.

Photos of the finished project!

Parts list:


ITB Build – Part 13


So big update! I finally got my built head ๐Ÿ˜€

Final specs:

  • 2001 NB6 head
  • Intake camshaft - 280deg 10.5mm lift
  • Exhaust camshaft - 270deg 9.4mm lift
  • Solid lifters
  • Oversized valves
  • Stronger valve springs
  • Fully reconditioned
  • Extensive porting, de-shrouding etc...
  • Port matched

Intake camshaft is a custom billet profile, and the exhaust is a custom regrind.

Haven't had too much time to work on it, but things will move fast next week.

I bolted the intake gasket to the manifold and port matched it using my Dremel, nothing too exciting ๐Ÿ˜›