Why do people always relate to the nozel size for there figuires, the cc of the egisting engine must bear some resemblance to what size you can install??

 

Ironically mate, no not really.

Obviously there gets to a point that there is a limit, a set of 500bhp jets on a moped isnt going to work for example.

but provdiing the engine is capable of cleaning burning the extra fuel and nitrous the jetted amounts will give surprisingly similar outputs on totally different engines.

Other factors such as wether the engine is turbo'd or not have more influenece on the power outcome than the size of the engine.

I would typcially get bigger gains for a calibra turbo on 50bhp jets than i would on a V8 on 50bhp jets for example.


The biggest single factor in wether you get decent gains on most engines is down to the ignition strength and the timing map.

 

Cheers for that, it has been confusing me....... ALOT!!!

 

cool, just to elaborate a little further.........




Effectively its kind of like a turbo or N/A tuning really.

Ignore a few subtle differences that you get from different engines in terms of efficency and losses and AFR changes etc, but fundamentally if you have two engines that manage to burn the same amount of fuel at a similar mixture, they will make roughly the same amount of power.

Now when it comes to tuning an engine normally everything comes down to how much air you can ram into it, now there are various ways of getting more air into an engine, hotter cams, more boost, bigger CC bottom end etc, but ultimately all they are allowing you to do it get more air in, hence more oxygen, hence burn more fuel.

With nitrous you have oxygen in a compound form which it can be released but in LIQUID form instad of gaseuos, this means that you can effectively put as much as you want in, its very easy to add 100% more power with nitrous as its only a tiny tiny percentage increase in intake flow into the engine.

Where as a turbo makes the air a bit denser by pressurising it, nitrous is hundreds of times more dense in oxygen for any given volume because its liquid.

Its actually the change from liquid to gas that occurs in most kits on the market that limit their usefullness and is one of the main reasons that you see poeple like me and Rod banging on about how great wizards of nos kits are as they are the only kit that really considers this.

 

I think I understand that, i'll re-read when I get home to fully get my head around it.

Thanks for sharing your knowledge!

 

No problem pal, thats what we are all here for