Why is my supercharger not building boost?
Air leaks on the discharge side of the supercharger can bleed off sufficient boost air to actually reduce boost pressure. If the belt is not slipping and there is no leaks then the boost drop off is the result of inlet tract restrictions. The supercharger is being starved for air and is losing inlet pressure.
How do I get more boost out of my supercharger?
The simplest way is to increase the speed at which the supercharger spins in relation to engine RPM. To do this either you swap out the lower “crank” pulley for a larger one, or swap out the upper pulley on the supercharger itself with a smaller one.
What does overboost cause?
An increasingly common feature on modern cars, overboost can provide extra power from a turbocharged engine when needed. The overboost function allows the engine’s turbocharger to force more air into the engine for short periods, producing a boost of extra power.
How do you know if your overboost?
Some of the most common symptoms are:
- Loss of power or no turbo charger boost.
- Engine overheating.
- Harsh transmission or transmission overheating.
- Engine knocking or pinging especially on acceleration.
- Ignition misfiring.
What do you need to know about superchargers?
First, check the supercharger pulley for signs of belt slippage (i.e. black powder or residue around the pulley). Glazed, smeared, or melted belt rubber on the supercharger pulley is another sign of slippage and the corresponding heat associated with slippage.
Why does my supercharger make a screeching noise?
Glazed, smeared, or melted belt rubber on the supercharger pulley is another sign of slippage and the corresponding heat associated with slippage. A slipping belt/pulley will often make a screeching noise. Some noise or slip at the shifts is not a problem.
What causes a car to have a low boost?
The cure for this problem is to install a larger supercharger or a smaller supercharger pulley if its available for your application. As with any inlet component (inlet tube, mass air meter, throttle body, etc.) a clogged or insufficiently sized filter will reduce airflow to the supercharger and lower boost.
Why does the boost drop off at high RPM?
Boost Drop Off At High RPMs: If the belt is not slipping and there is no leaks then the boost drop off is the result of inlet tract restrictions. The supercharger is being starved for air and is losing inlet pressure. Boost drop off will be most noticeable at higher RPM/engine air flow.
Why is the boost of a supercharger not always constant?
Supercharger boost, however, is not totally constant. This is because at lower blower speeds, the clearances between the superchargercase and the rotors allows for air “leakage” with some loss of boost efficiency.
What should you know about Weiand Roots superchargers?
One important thing to keep in mind with respect to Weiand roots superchargers is that throughout the rpm range, the air ratio of the supercharger is consistent with the engine displacement. Supercharger boost, however, is not totally constant.
How much boost does a Weiand Pro-Street supercharger have?
Weiand Pro-Street 6-71 and 8-71 supercharger kits come with drive ratios that will typically produce 5 to 7 pounds of boost. These boost levels are based on 350 or 454 cid engines. The 10-71 through 14-71 supercharger kits come with drive ratios that will produce 5 to 8 pounds of boost.
What should compression ratio be for Weiand superchargers?
As a basic rule of thumb, the 5 to 8 pound boost range that is provided by the standard pulleys supplied in Weiand’s supercharger kits is suitable for compression ratios in the 8 to 9:1 range when used with 92 octane gasoline. If your compression ratio is higher than this, you will have to run less boost.