Is high compression better for Turbo?

In dealing with forced-induction applications, it’s well known that increasing boost pressure on a properly sized turbocharger will increase power production (at least, to a point when the capacity of the turbo or fuel system is exceeded). The higher the boost pressure, the lower the compression ratio of the engine.

What compression is best for Turbo?

If you’re going for a higher boost on the street, you’ll want to stay lower on the compression ratio to avoid detonation. However, if you’re contemplating a mild boost of say 7 to 10 lbs, a static compression ratio in the range of 9 to 9.5:1 may prove to give you better all-around drivability and off-idle acceleration.

Can you run boost on high compression?

The compression ratio of your engine has a direct relationship to how much boost you can run. If you have a high compression ratio, such 9.5:1 or 10:1, you will only be able to run a small amount of boost. Please note that all engines differ in their tolerance to detonation.

How much HP does higher compression add?

The power gain per point of compression is a diminishing return, the higher the compression gets. The gain from 12:1 to 13:1 is higher then the gain from 13:1 to 14:1. This is due to not only the efficiency of the fuel, but the power it takes to compress the air/fuel mixture.

What should the compression ratio be for a boost engine?

Table 1 shows that you obviously can’t try to run 10 pounds of boost on a 9.0:1 compression ratio engine. This gives you an effective compression ratio of 15.1:1, way beyond our 12:1 figure. If you are building your engine from scratch, it is a good idea to try to build it with a relatively low compression ratio, such as 7.5 or 8.0:1.

What happens when you increase the boost pressure on a turbo?

In dealing with forced-induction applications, it’s well known that increasing boost pressure on a properly sized turbocharger will increase power production (at least, to a point when the capacity of the turbo or fuel system is exceeded).

What kind of pistons are used in higher compression engines?

Dished pistons (front)are most common on lower-compression engines, while domed pistons (rear) tend to appear in higher compression engines. No. Don’t go out there and try to build a 17:1 compression ratio race engine with the boost pressure cranked up to 45psi.

What’s the best compression ratio for a ProCharger?

For Intercooled ProCharger EFI/TPI applications with compression ratios less than 9.5:1, boost levels of 14-17 psi can be safely run with full timing on pump gas, and will produce horsepower gains of 75-100% (depending upon the boost level and the motor specifications).