Monthly Archives: November 2005

Monza Cat Back Exhaust System Mazda MX5 Miata 1990-1993

I finally purchased and installed the Pacesetter Monza Performance exhaust on my MIata and I have to say that I was very pleasantly surprised at the purchase and the value. The body of the catback is a sleek black with very nicely welded seams and the metal looks like it will last for longer than a couple of years (though not as long as a Stainless Steel muffler would).

It goes together relatively well and is quite easy to put on the car. The only problem I had was with the U clamp that came with the catback was too small and I needed a new one.

As for the sound, I like thr growl. The old (OEM) muffler was already loud from rust, but this muffler has a low throat on low revs and screams on high revs. I was suprised at the increased throatiness of the engine on addition of the catback and performance was definitely increased, more so than any other performance enhancement on my car. I would definitely suggest this catback.

As for the price, the quality of the product and the final outcome, I would have to say that this is a good purchase for about $170 and a weekend in the garage.

DIY Dyno at Home

This is awsome and only if you are the most dedicated wrench head or a computer geek should you read any further. But this guy has published plans for a homemade dyno using a timing light spak plug clamp, a laptop computer, MATLAB and some old fashioned geek ingenuity. Basically he records some numbers from a pre-measured drive across the countryside, measures the “clicks” from the timing light clamp and puts three and seven together to develop the dyno curves. Absolutely fascinating stuff! Check out the DIY Dyno Page.

Change oil in your Mazda

In keeping with my series on performing oil changes on my Mazda, I replaced and serviced the transmission, the transaxle and the engine oil over the past week. I found some very good resources online for changing my oil. It actually cost me quite a bit more than the service station since I needed a lot of the tools required to perform the changes, but I squeezed it under $200 for all three with my tools. Oh, I also replaced the spark plugs and the wires with Denso plugs and wires. They were quite expensive compared to the regular brand but I have read a lot of literature that suggests that the firing point of the Denso/NGR plugs are just right as compared to the ones from Bosch etc.

Miata.net Garage has a good section on changing oil in four places on your car including Trans., Gearbox, Shifter Oil Change Pics which I found really quite useful. The author had suggested to use either Redline or MTL but I could only find Valvoline 75w30 at my local car stores so thats what went into the tranny and the transaxle. There is also a nice article over at the Tech Guys page that gives you all the gory details of the torque specs and such. Make sure you buy the seals and gaskets before you open any oil drain plug. 😉 (Mine leaks at the seal because the previous owners ignored them)