Page 8 of NOS Technical Information by Holley Performance Products, Inc.

technical tuning question answer technical information efi wet dry systems q a are there benefits to using nitrous with turbo or super-charger applications absolutely in turbo applications turbo lag is completely eliminated with the addition of a nitrous system in addition both turbo and superchargers compress the incoming air thus heating it with the injection of nitrous a tremendous intercooling effect reduces intake charge temperatures by 75 degrees or more boost is usually increased as well adding to even more power exceed 15 to 1 generally the higher the compression ratio the more ignition retard as well as higher octane fuel is required for more specific information talk to one of our technicians q a how important is it to use nitrous and fuel filters in a kit some of the most important components of any nitrous system are nitrous and fuel filters to keep contaminants from attacking the solenoid or plugging up a jet nos nitrous filters feature a special stainless steel mesh element from the aerospace industry q a hidden systems can service station fuel be used for street/strip nitrous oxide applications yes use of a premium type leaded or unleaded fuel of 92 or greater octane is recommended for most applications many nos systems are designed for use with service station pump gas however when higher compression or higher horsepower levels are used a racing fuel of 100 octane or more must be used q a q a how complete is an nos kit nos prides itself on offering the most complete systems on the market today they include virtually every component that may be needed for a complete installation parts such as extra long carburetor studs gaskets pipe tap fuel hose brackets filters fittings hardware wiring 10 lb bottle with hi-flo valve comprehensive instruction manual and all other major components are standard in every nos kit what are the advantages of using nitrous compared to other performance options the cost of many other performance options can put you in the poorhouse dollar for dollar you can t buy more performance with less money than nitrous with a nitrous system performance and reliability can be had for a much more reasonable price while still retaining the advantage of a stock engine during normal driving and nitrous offers tremendous gains in torque without having to rev the engine to excessive rpm s these factors help your engine last longer than many other methods of boosting horsepower plate systems q a supercharger turbo systems what type of cam is best suited for use with nitrous oxide generally cams that have less exhaust overlap and more exhaust duration however it is best to choose a cam tailored to normal use when nitrous is not activated since 99 of most vehicle operations is not at full throttle there are special cam grinds available for nitrous competition which have more aggressive exhaust profile ramping etc since cam selection depends largely on vehicle weight gearing etc it is best to stick to cam manufacturers recommendations for your particular goal direct port systems q a what is the difference between a standard and an nos hi-flo bottle valve the orifice of the hi-flo valve is much larger than the standard valve allowing for a larger flow of nitrous with a small orifice valve a pressure drop could occur when nitrous flow is high causing surging or inadequate nitrous flow the nos hi-flo valve eliminates this problem nos hi-flo valves are standard in all nos kits q a q a q a does nos manufacture kits for motorcycles water craft or snowmobiles absolutely nos can spray nearly any fuel burning combustion engine powersports systems q a q a are nos kits applicable on late model efi cars yes in fact nos has by far the most comprehensive selection of nitrous kits available for these cars call for your specific application if you do not see it listed what kind of pressures are components subject to in a typical nitrous kit pressures often exceed 1,000 psi this is why nos uses only high pressure tested aircraft quality components like stainless steel braided teflon lines throughout its system solenoids jets q a what affect does nitrous have on an engine with considerable miles on it this depends largely on the actual condition of the engine components any performance modification to an engine that is worn out or poorly tuned will have detrimental effects however an engine in good condition with good ring and head gasket sealing should be able to use nitrous without any abnormal wear what type of nitrous system is better a plate injection system or a direct port injection system the advantages of a plate system are ease of installation and removal ability to transfer easily to another vehicle ability to change jetting combinations quickly and in most cases provide you with all the extra hp you will ever need 75 to 350 more hp in some cases such as in-line type engines with long runners a direct port type system is advisable for maximizing distribution also where more than 350 hp is needed our direct port fogger systems will provide the ultimate in distribution and power up to 500 hp direct port injection is also desirable when the system is hidden under the manifold how do i know how much nitrous is left in the bottle the most reliable method was is to weigh the bottle to determine how many pounds remain when a bottle is near empty about 20 or less nitrous remaining a surging effect is normally felt components accessories nitrous controllers electrical components q a will the use of nitrous oxide affect the catalytic converter no the increase in oxygen present in the exhaust may actually increase the efficiency of the converter since the use of nitrous is normally limited to 10-20 seconds of continuous use there usually are no appreciable effects temperatures are typically well within acceptable standards q a what is the function of the blow-off safety valve on the bottle it is very important not to overfill a bottle i.e a 10 lb capacity bottle should not be filled with more than 10 lbs of nitrous oxide by weight over-filling and/or too much heat can cause excessive bottle pressures forcing the safety seal to blow and releasing all the contents out of the bottle plates throttle bodies q will the percentage of performance increase be the same in a highly modified engine compared to a stock engine when using the same nos kit and jetting not really in most cases the percentage of increase is greater from a stock engine because it is not as efficient as the modified engine in a normal non-nitrous mode however since the effects of nitrous oxide magnify the output of any engine the total power output will be much higher in the modified engine q a should i modify my fuel system to use nitrous oxide most stock fuel pumps will work adequately for smaller nitrous applications it is important to check to see if your pump can flow enough fuel to your existing fuel system whether carburetor or fuel injected as well as being able to supply the additional fuel required by the nitrous kit under full throttle conditions it may be a good idea to dedicate a separate fuel pump to the nitrous kit q a will i have to change my ignition system most late model ignition systems are well suited for nitrous applications in some higher hp cases it may be advisable to look into a high quality high output ignition system with a built in spark retard nozzles a distribution blocks fittings hoses tubing q a q a can high compression engines utilize nitrous oxide absolutely high or low compression ratios can work quite suitably with nitrous oxide provided the proper balance of nitrous and fuel enrichment is maintained nos kits are used in applications from relatively low compression stock type motors to pro-modifieds which often which is the best position to mount a nitrous bottle nos bottles come with siphon tubes and in order to maintain proper nitrous pickup it is important to mount the bottle correctly we recommend mounting the bottle at a 15 degree angle with the valve end higher than the bottom of the bottle the valve end of the bottle should point to the front of the vehicle and the valve knob and label should face straight up fuel pumps regulators gauges tools merchandising part index tech line 270-781-9741 1-800-99refill 9

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