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Rotary Engine Builds | More power means knowing how to get it right before you put it together

[fa icon="calendar'] Jul 19, 2018 6:00:00 AM / by Doug Sherwood posted in Mazda Rotary Rebuilds

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Rotary Engine builds | Here we are putting together a 12A street port motor for a vintage Rx7 club race car.

When you belong to the Rocky Mountain Vintage Race car club, having the right car to play with on those event weekends is important.

The upgraded engine replaces their old tired race motor. Like the last post on race engines, every engine destined for racing is only going to have a finite number of laps in it.

Here we chose to have the side housings lapped and ported to street port on the intake and race port on the exhaust.

What does that get you? Well increasing the port timing opening and close for intake creates greater flow of fuel and air. With that comes power and moves the power curve up the rpm range.

On the exhaust side, we’ve opened up the port dramatically vs. stock. This allows the spent gases to escape and create a pulse wave like no other. This is where the ‘Brap, Brap’ comes from. It is also where the exhaust easily belches out flames, pretty cool when racing hard.

In order to handle the added power gains, we have used hardened stationary gears and all new seals at higher tolerances than OEM. This means that the time to set up the rotors is 2 hours each as all seals must be measured and matched to their respective grooves.

We also use an upgraded oil system with ported oil galleys, new parts and a high pressure regulator. The goal for this motor is reliability and make solid power. Add in that in vintage racing, they use carburetors. This build is not exception, we are using a weber 48IDA with a racing beat intake manifold.

We still have work to do on this build, add in an aluminum flywheel and racing beat low inertia high force clutch for good bite out of the corners. Then it is off to be installed in the car and tuned on our Mustang dyno.

Horsepower comes in many ways, for some it is the wail of the screaming angry Wankel. Stay tuned.

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Race Car preparation and maintenance | Going fast, making it last

[fa icon="calendar'] Jul 17, 2018 6:00:00 AM / by Doug Sherwood posted in Dyno Performance Shop

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The racing season is in full swing this time of the year. With that comes responsibility and awareness.

That is where the best engines and maintenance do not mean much unless you can properly monitor performance. I am talking about knowing how and understand why your engine and performance may be weaning due to tearing up the race track.

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Choosing a Larger Turbo for more Power w/o losing reliability

[fa icon="calendar'] Jul 10, 2018 8:00:00 AM / by Mike Wiener posted in Subaru Horsepower

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When you have a turbocharged engine, most manufacturers only use 80% of the full capability of the turbo.

They do this to make the engine more reliable and last longer. But this is something an enthusiast has to put aside, whether they realize it or not.

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More power, more responsibility | Performance Wheel Studs

[fa icon="calendar'] Jun 12, 2018 8:00:00 AM / by Mike Wiener posted in High Performance Shop, Brake Upgrades

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Stronger Wheel Studs | As we turn the power up on a vehicle, added stress affects almost every component of your vehicle.

To prevent premature failures, we often use stronger hardware made with stronger materials than the stock parts. A very common example of this are the bolts used to attach the engine head to the block. Not only ares these studs 3-6 times stronger than the stock bolts, they are reusable.

A part that is often overlooked when it comes time to strengthen things up, are wheel studs. In fact, most people never even think of the part until a lug nut get’s seized or a stud breaks off while changing wheels.

Wheels studs are probably one of the most imports pieces of hardware on your vehicle. They attach the wheels to the car and hold the brake rotors in place. If the wheel studs fail, the wheel falls off and may cause a major accident.

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Horsepower gains in Colorado | Dyno Performance Shop

[fa icon="calendar'] Jun 1, 2018 9:00:00 AM / by Mike Wiener posted in Building Horsepower, Dyno Tuning Colorado, Prochargers

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Horsepower Colorado | When it comes time to add power, many horsepower enthusiasts immediately go for a turbo or supercharger.

These two power adders are the best way to get serious horsepower out of your motor. There are no bottles to fill or special fuel to use. When you mash the gas, the power is always there.

But which one do you choose? They both perform the same task of cramming more air into your engine, but they do this task very differently.

A turbo is powered by exhaust gases and is fairly dynamic. Boost pressure can vary significantly at different engine rpm's. Even at low rpm's, a turbo can build significant boost if allowed enough time. Through the use of a wastegate, boost pressure can be turned up or down at will. Want more power? Turn up the boost!

A supercharger output is directly proportional to the speed of the motor. This means that at a given engine speed, the supercharger will make a certain amount of boost. The only way to increase boost is to change the size of the supercharger pulley, but there is a limit to how small of a pulley you can use. A smaller pulley is harder to spin and has less surface area than a larger pulley for the belt to grab. This means it is more likely for the belt to slip on a smaller pulley, making it even harder to increase the output.

Living at altitude presents its own challenges when selecting a turbo or supercharger system. A turbo system that is designed to make 15psi of boost at sea level will still make 15psi of boost at high altitude. The turbo is capable of spinning faster to increase its output but it will not make the same power that is does at sea level due to the lower efficiency of having to spin faster.

A supercharger that is designed to make 8psi of boost at sea level will only produce 3-5psi at 5000 feet. It's a very significant loss and utilizing a smaller pulley is the only way to get some of that back. Just like a turbocharger though, a supercharger loses efficiency when it spins faster and will never make the same power as it does at sea level. Because of the dynamic properties of a turbocharger, it's efficiency losses at higher speeds is not as bad as the superchargers.

The Procharger line of superchargers is a very popular system we frequently install. Many enthusiasts choose this system for their vehicle for a few reasons. A Procharger system is less expensive and easier to install than a turbo system. There is also no fear of an overboost situation that could instantly destroy a motor if a vacuum line becomes loose.

The ProCharger is a centrifugal supercharger. It's compressor is a very similar design to the compressor you would find on a turbo. There are a set of gears inside the ProCharger unit that take the several thousand rpm's of engine speed and step them up to several ten thousand speeds. This is different than the screw type designs of Roots style and most other superchargers.

On a recent ProCharger build, we were only able to get 2-3psi of boost using the pulley supplied in the kit.

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Passing Emissions in Colorado | Do it once, get it right

[fa icon="calendar'] May 16, 2018 7:00:00 AM / by Mike Wiener posted in Emissions

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Emissions and high performance cars are two things that people believe do not go well together.

If you've followed our High Performance blogs, you know that this isn't the case anymore.

Every one of our big power projects is emissions compliant, makes great power and will pass the Colorado rolling dyno sniffer test.

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Got a V8? Want more power? Superchargers Denver

[fa icon="calendar'] Apr 17, 2018 7:36:23 AM / by Mike Wiener posted in Superchargers

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Do you have a vehicle with a V8 engine in it? Do you want more power? Like, a lot more power?

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Colorado Rotary Engine REbuilds

[fa icon="calendar'] Mar 13, 2018 7:00:00 AM / by Doug Sherwood posted in Mazda Rotary Rebuilds, mazda

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Rotary Engine Rebuilds in Colorado | Rebuilding the rotary engine is a different animal.

It requires preparation and skill to make sure that the sandwich comes apart with ease and you know where all the seals are afterwards.

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G-LOC brake pads in Colorado | We are a G-LOC dealer

[fa icon="calendar'] Mar 12, 2018 4:53:01 PM / by Doug Sherwood posted in Brakes

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G-LOC BRAKE COMPOUNDS | anything less is just a brake pad


G-LOC™ GS-1 for high performance cars, street and track. 

We are now a full fledged dealer for G-LOC brakes, why? Because we have used them on the track and find that they offer up very impressive braking capabilities and have a wide range of operating temperatures.

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Let's talk about Supercharging | Power at 5000+ altitude

[fa icon="calendar'] Mar 9, 2018 7:30:00 AM / by Mike Wiener posted in Superchargers, procharger

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If you want big power gains out of your vehicle, you are going to have to look at forced induction.

This would mean a turbo or supercharger system. Let’s look at Supercharging.

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