Home Performance Kits Crate Engines New Products How it Works Installers Distributors Contact Us History FAQ Links


Small Block
Big Block
Slant 6
Hemi 6

Small Block
Big Block
6 cylinder

Small Block
Big Block
6 cylinder

Negative Supercharging Distributor Advance Springs
(Suit Bosch made distributor)

Produces up to 50 lbs/ft more torque from low to midrange and up to 10% more fuel economy

No other product produces this much
torque and fuel economy for less than $30!

Negative Supercharging (Impulse) advance springs fit ONLY 1960-81 Bosch made points or electronic distributors

Negative Supercharging advance springs produce a radical new advance curve which substantially improves torque from idle to midrange, acceleration, towing power, responsiveness, fuel economy and eliminates pre-ignition (pinging) in street engines. The Negative Supercharging advance springs fit ONLY Bosch made points and electronic distributors used in Chrysler 6 cylinder engines.

Negative Supercharging advance curve MUST be used in conjunction with the following advance at the crank

Fuel Open Chamber Close Chamber IMPORTANT
High Octane 25° BTC 22° BTC Ignition timing should not be advanced by more than 25° at the crank because it will reduce power even if pre-ignition (pinging) is not audible.
Low Octane 21° BTC 18° BTC

Negative Supercharging vacuum advance
Vacuum advance at the crank should not be more than 45° with open chamber heads and 40° with close chamber heads.

Street engines have been using the wrong ignition advance curve for the past 50 years!
We developed the Negative Supercharging advance curve in 1993 to maximise the power produced by Negative Pressure Supercharging. However, we found this new advance curve also improves the torque and fuel economy in engines from standard, performance to towing.

Impulse Engine Technology P/L

PO Box 986 Randwick NSW 2031 Australia
Ph: (02) 9398 5544
Fax: (02) 9398 5644

International: Ph: +(612) 9398 5544
Fax: +(612) 9398 5644

Email Us

Inventor of Negative Pressure Supercharging

© Copyright 1996-2015 Impulse Engine Technology Pty Ltd. All Rights Reserved.  

Website Hosting & Maintenance : WebStart