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How to Select a Supercharger


The Miata enthusiast has been introduced to several new supercharger systems over the past couple of years. Vortech, Twin Screws, Roots, Whipple, Centrifugal, Coldside, Hot-side... it's just enough to spin your head.

No longer is there just one "major" Miata supercharger with limited boost levels. Finally there are several different systems to choose from. It is about time that someone has offered Miata owners a supercharger system to rival the turbo systems that have been available for many years.

But it can get vary confusing deciding on what is the best supercharger system to meet your goals and budget. At Track Dog Racing™ we've waded through a lot of this

 information and have selected as our supercharger supplier of choice

Supercharger Confusion

 


Hot-Side Versus Cold-Side Supercharger

All forced induction systems produce heated air.  Outlet temperatures under high boost conditions can reach 300 F. Even at cruising, outlet temperatures commonly are around 125-140F.  As inlet air temperatures increase combustion temperatures also increase bring the engine closer to detonation.  Both supercharger setups if over boosted will cause serious detonation and potentially destroy your engine.

Cold-Side setups are far from cold and do not have the option to lower the combustion temperatures.  Hot-Side setups can use water-to-air and air-to-air cooling for higher efficiency and allow safer power levels. With cooler combustion air, torque is increased considerably.  Dynos have shown that at 10 PSI torque on an intercooled system would be about 17% higher, power you can feel. You should never use a Cold-Side setup on a track application, way too high combustion temperatures.


Why use TDR as my supercharger reseller?

TDR's expertise is high-performance supercharger systems that are suitable for the race track and street usage. We've put together high-performance systems for our customers and we can help you optimize your existing system. We also sell and install stock supercharger kits for customers that want to keep things simple.

We not only design and manufacture products, we are your one stop source for all your supercharger and performance needs. 

 


How much power?

No Hot Air

The Internet is abuzz with many wild claims of supercharger power ratings. At TDR we've been researching the limits of supercharging stock Miatas. Unlike some of the other vendors, all our dyno runs are available for our customers to review. There are no "fuzzy" dyno charts or outrageous claims from un-streetable setups to confuse you. 

That's why TDR's motto is "NO HOT AIR"

It's something we believe in strongly and we want to help our customer achieve "real power. . .for the real world". We've logged tens of thousands of miles on our test cars, both on the street and track. We are continually testing our product line so you don't have to find out what doesn't work. We only sell products that are proven winners.

Contact us today and we'll help put together the right system for your budget and goals



So what can I expect from my stock engine?

We learned, through trial and error, that the upper power level for the stock '94-00 Miata motor is around 225 rear wheel horsepower (RWHP). The 2001 and newer models use higher compression, which limits boost levels and maximum horse power, so they will have a safe upper level of 210 RWHP.

Although the factory cast iron block and forged crank are excellent for high horsepower, the stock connecting rods and cast pistons are the limiting factors that define the maximum recommend boost levels.

The blue line on the chart shows us that the maximum recommended boost level for a '99-00 stock Miata engine, which has a compression ratio of 9.5 to 1, should be around 12 psi. The red line on the chart shows that the '01-'04 stock Miata engine, which has higher compression (10 to 1 CR), has a recommend maximum boost of 11psi. While the '94-97 Miata has a lower compression of 9:1 and can safely handle 13.5 psi. This is based on using the TDR Air-to-Air intercooler at an efficiency rate of 85%.

Higher boost levels beyond the recommended range can cause piston and rod failure and even the destruction of the engine block. If you are considering higher boost levels, contact us for recommendations on engine upgrades.


But I don't want to build an engine!

All forced induction systems produce heated air.  Outlet temperatures under high boost conditions can reach 300 F. Even at cruising, outlet temperatures commonly are around 125-140F.  As inlet air temperatures increase combustion temperatures also increase bring the engine closer to detonation.  Both supercharger setups if over boosted will cause serious detonation and potentially destroy your engine.

Cold-Side setups are far from cold and do not have the option to lower the combustion temperatures.  Hot-Side setups can use water-to-air and air-to-air cooling for higher efficiency and allow safer power levels. With cooler combustion air, torque is increased considerably.  Dynos have shown that at 10 PSI torque on an intercooled system would be about 17% higher, power you can feel. You should never use a Cold-Side setup on a track application, way too high combustion temperatures.


So what will all this cost me?

Adding power to a stock engine can be an expensive proposition. Determining your desired power level you want to attain is the first step to selecting your system. We also are believers in leaving room for upgrading.

Please give us a call and we can put together an estimate to meet your power goals and budget.


So how do I get started?

TDR has the knowledge and experience to help you make informed decisions. First and foremost we want all our clients to have a reliable supercharger system that will reach their power goals with a car that will be streetable. Call or e-mail us today and we will be glad to help you select the proper supercharger package today.

 


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