What is the highest compression ratio for 91 octane?

about 10 to 1

Does higher compression increase horsepower?

The generally accepted gauge for adding compression is that one full point of compression can add between 3 to 4 percent power. So, if an engine is making 50 horsepower and we add a full point of compression (from 11 to 12:1 for example), this could potentially push the power to 51.5 horsepower.

What happens if compression ratio is too high?

(1) With high compression ratio, they operate at higher pressures and offer a cleaner and complete burn of fuel leading to better mileages too. However, it’s not ALL good. The higher pressure requires stronger build of the engine (in some cases heavier). Chances of knocking in the engine are higher.

Can you run high compression with Turbo?

Re: High compression engine + turbo = bad? ( You can run a turbo with that higher compression but your margin for error will be less and your tuner will really have to know what he or she is doing.

What is a good compression ratio for Turbo?

9.5:1

How much turbo boost is too much?

If you run 45 psi of boost or more on an HX35 for any extended period of time, your turbocharger is almost sure to fail.

What pistons are best for Turbo?

Opinions vary whether turbo engines are best suited for dished or flat-top pistons, but the general consensus is that it depends on combustion chamber design and volume. Small combustion chambers tend to do better with a deep piston dish, and larger ones do better with a shallow dish.

Do forged pistons increase horsepower?

It is true that forged pistons are heavier than cast pistons, but this is counteracted by the ability to provide a high compression ratio inside the engine, enabling the engine to rev higher and produce more power.

What compression is best for boost?

For pump gas (91-93 octane) applications, a compression ratio of 8.5:1 to 9:1 is recommended for boost levels of 8-10 psi. Higher octane fuel will allow you to run higher boost levels, approximately 1 psi for every 2 points of octane.

How do I choose a good turbo?

Look for something that’ll pump the most air into your engine’s cylinders but do so as efficiently as possible; you’ll need to review a proposed turbo’s compressor map to verify any of this with certainty. Most turbo manufacturers provide these graphs and charts, which make choosing the right compressor a lot easier.

Can you have too big of a turbo?

Believe it or not, you can have a turbo that is too big… You can have a big turbo that is not matched properly with your engine or even matched properly with itself (size of hotside vs compressor).

What happens if your turbo is too small?

If the turbo is too small, you are not running the compressor in it’s “happy zone” of low heat/high efficiency. The same can be said for a turbo thats too large, but because of the low boost pressures there is low heat, so too large rarely has a heat problem.

How much horsepower does a turbocharger add?

A turbocharger works with the exhaust system and can potentially give you gains of 70-150 horsepower. A supercharger is connected directly to the engine intake and could provide an extra 50-100 horsepower.

At what RPM do turbos kick in?

While your car’s engine revs, at cruise, at around 2,000 rpm, a turbo’s turbine can reach rotational speeds of more than 280,000 rpm.

Which is better supercharger or turbo?

While the turbo’s primary drawback is boost lag, the supercharger’s is efficiency. Because a supercharger uses the engine’s own power to spin itself, it siphons power”more and more of it as engine revs climb. Supercharged engines tend to be less fuel efficient for this reason.

At what RPM is Turbo activated?

From 1-2,400 rpm, the primary turbocharger is activated; at 2,400-2,800 rpm, the second turbocharger is activated; and beyond 2,800 rpm, both turbochargers function. This system is recommended for diesel engines with displacements of 2.0 liters and above, and V engines.

Do turbos spin at idle?

Yes, the turbo spins at idle. Any time the engine is running, exhaust is flowing through the turbo and spinning the wheels.

Do Turbos need servicing?

Turbos are much more complex than “naturally-aspirated” engines, and require special treatment to keep them performing at their best. Regular maintenance and changes to your driving style are what’s needed to get the most from a turbo engine, and to avoid nasty repair bills.

Why do turbo cars sound bad?

The turbo absorbs a lot of exhaust pressure by spooling the turbine, thereby muffling sound. Also, the E9X NA engine is far more “on the edge” to make the horsepower they want.

Is supercharger safer than Turbo?

Centrifugal Supercharger ” Looks a lot like a turbo. It’s very efficient but provides the smallest amount of boost. Thanks to that however, it’s safer and less complicated to run than other types. Compared to a turbo that spins at over 150,000 RPM, a centrifugal supercharger spins closer to 50,000 RPM.

What sound does a bad turbo make?

Whining Noise Another prominent, abnormal turbo noise is the whining of a blown turbo. It sounds very similar to an engine belt being spun too fast, a siren, or even a supercharger.

What sounds better naturally aspirated or turbo?

Larger displacement engines sound better, they deliver power in a more linear fashion which some people prefer, and having no turbine in the way of the exhaust means a naturally aspirated engine likely sounds better than a turbocharged engine of the same cylinder count/displacement.

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