Tag Archives: miata 1.6

Shocks and Springs

The coilovers I am using for my car are the following:


Varishock Quickset 1 – 10.05″-14.3″ travel.  Shock data available here: http://www.cachassisworks.com/Attachments/DataSheets/VAS_112XX_DS_WEB.pdf

Damping has a single adjustment knob that varies bound/rebound at the same time.  Damping data excerpt:


Summit Racing Coilover Shocks – 10.125″ -14″ travel, bound/rebound adjusted with two separate knobs


Wiring Harness

Started connecting the wiring harness up to the car. Thanks to the guy i bought the motor from for labeling most of the important connection points. We were able to connect most stuff up including motor, instrument panel,  transmission,  fuel pump,  ignition,  battery,  and other bits. My steering signal and lighting assembly seems to be different from the harness and will require some re-wiring to make use of the signal and lighting switches.  Will have to locate and attach the thread the harness through the chassis in its final resting place later.

Next to get the fuel supply, cooling supply and exhaust sorted so that we can get the engine running.







Cut circular holes in the firewall to mount the factory wiring harness seals and allow the harness to pass through.  Detached and re-attached the necessary engine wiring to thread it through the hole.  Factory seal/gasket fits well into holes.




April 10, 2016 – Update – Started thinning out the wiring harness to try to cut down on the bulk. Lighting and engine running so excess wires can be weeded out. Removed radio, hvac, headlight retractor and door wiring to start.



Supercharger Service – Eaton M45

When the engine was first started, I could hear a rattle coming from the supercharger.  The supercharger on this engine is a Eaton M45, that is common to many vehicles throughout the years (mini cooper s, pontiac gran prix/am?, etc.)  From my reading online, there are two general causes of the rattle.  Those are failing bearings (which there are many in the supercharger) and worn coupler.  For general diagnosis, with the supercharger belt off, turn the snout pully, if there is play when rotating back and forth, the coupler is likely worn, if it is rough and grindy, bearings are likely the problem.  On mine there was play when rotating, but it rotated smoothly, implicating a worn coupler.  Lucky for me, this is the easiest of fixes.  Drain supercharger fluid, remove snout, replace coupler, reinstall snout, fill with new fluid, done.  I purchased kit similar to those found on this site (http://www.superchargersonline.com/index.php?main_page=page&id=57).  From what I’ve seen online, replacing bearings requires more care and expensive tools (presses, etc).


Eaton M45 – Supercharger had to be removed from the engine in order to remove the snout.


Snout off, smelly oil (muenster cheesy) removed, and coupler coming off. Take care not to pull the next section of supercharger off which supports the rotor/fan shafts as this will be loose too.




Brakes and Clutch

Prior to performing the first drive, the brakes and clutch were made operational. For the brakes, the lines were installed, filled with fluid and bled. Started bleeding at the furthest brake caliper and made our way up to the closest to the master cylinder, then repeated until there were no more air bubbles. Luckily none of the bleeder screws/valves on the calipers were seized shut. A Wilwood brake proportioning valve was installed in the line that I purchased from Flyin’ Miata (https://www.flyinmiata.com/complete-adjustable-brake-proportioning-kit.html)

For the clutch, the existing slave cylinder was seized and had to be replaced with new one I picked up from a local auto parts store. Once replaced, the master was filled with fluid and line was bled.

New clutch slave.
Old seized clutch slave.
Factory service manual clutch slave diagram.
Service manual clutch slave mounting torques.
Bleeding brakes.
Bleeding brakes. Rims and tires need cleaning.

Fuel System pt2

Received the new fuel pump, fuel filter in the mail and I picked up fuel injection line to use as my regular fuel line.  Fuel line is a Barricade with a rated working capacity of 225psi noted on the hose although the guy at NAPA auto said it was rated to 180 psi working pressure.

Layed up a section of fuel line to see how it will run and if I had enough. Looks like it will work well.  Will have to work out mounting the fuel pump somewhere onto the frame to avoid vibrations and noise.

fuel line
Fuel line running through the driveshaft tunnel.
fuel hose
3/8″ Fuel injection hose – Barricade Greenshield 225 PSI. Picked up 20′ of this. Sold for $3.90 a foot at local NAPA auto.
fuel pump and filter
Wix fuel filter (made in Russia) and Airtex E8248 fuel pump. Pump comes with mounting brackets and hose clamps.

Fuel System

Working to get the fuel system together on the car.  Would have liked to use the stock miata fuel pump and sensor assembly, but my fuel tank is too shallow to allow it as it is an in tank pump system. Thought about mounting the stock fuel pump outside, but there are a few pin holes on the pump itself that likely leak fuel.  Would have to fabricate a canister to contain the pump in fuel so as avoid un-contained fuel leakage.  Decided to order a new external pump and mount it inline with the fuel system.  The stock pump is said to generally max out at 85 psi, but added flow may be desirable.  I ordered a high pressure pump with greater flow rate, although this may not have been necessary, although it was difficult to find any external pump meeting the stock specifications.  According to Airtex, the stock pump generally follows these specs:



Type Turbine
Volts 12
Inlet Type Strainer
Outlet Size 5/16 in.
Outlet Type Hose Connect
GPH (Free Flow) 45
Max Pump PSI (Not System) 80-100

The pump will be installing has the following specs:



Type Rollervane
Volts 12
Inlet Size 3/8 in.
Inlet Type Hose Bead
Outlet Size 3/8 in.
Outlet Type Hose Bead
GPH (Free Flow) 60-70
Max Pump PSI (Not System) 110-120

So the new pump will have significantly higher flow capacity and somewhat higher pressure.  I picked it up from amazon (http://www.amazon.ca/gp/product/B000DN7VME?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00) and it comes with mounting hardware, which is a bonus.

Also will be installing a Wix 33003 inline fuel filter which has 3/8″ fittings to match the new pump. (http://www.wixfilters.com/Lookup/PartDetails.aspx?Part=47940 available here http://www.amazon.ca/gp/product/B000CSEUPG?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00)

Will have to pick up some fuel line capable of fuel pressures reached in the system.

At this point I am unsure how the higher pump pressure will affect the fuel delivery, as the supercharger kit came with a fuel pressure regulator, which I believe will dial in the correct pressures and fuel delivery for the boosted system.

In my review the fuel delivery system I came across a few good resources regarding pressure regulators and system considerations.

Fuel Pump info (Turbo Miata): http://miataturbo.wikidot.com/fuel-pump

Fuel Regulator info (scientific paper): http://scialert.net/fulltext/?doi=jas.2005.781.786&org=11

Some info is provided in the supercharger installation manual:




There are a few different supercharger installation manuals kicking around online, which these photos are taken from.