Decent exhaust system for the Cup 240
Discussion
garyfitz said:
Dear all, I have been told by my Lotus guy here in Tokyo that the right systems to fit is a HKS system, but there is not one available yet for the Super Charged engine. Does this sound right? Will the exhaust system be different for the supercharged engine than the standard engine?
Well I guess so, because a supercharged engine gets in a lot more air then a normal aspirated engine same size, so that way it has to loose more air too down the exhaust, that way you need bigger bore pipes to get faster flow in the pipes! other wise its like try to blow a lot air through a straw...sounds like astma
GTRene
As I understand it, coming up with an exhaust system that maximises performance is mainly about the manifold which should be designed to use pulse tuning to help extract exhaust gases. And So as long as the rest of the system is not too restrictive it shouldn't really make all that much difference.
As most of the available systems for the Toyota engine don't change the manifold AFAIK, then weight/looks/sound are really what we're buying when we fit replacement exhausts from the cat back. So if as I believe is the case the manifold is the same between the normally aspirated and superchared cars then I'm sure the same aftermarket exhaust can be used without much impact either way.
If you really wanted best possible performance you would mess about with the tuned lengths of the manifold pipes so they are optimum for the specifics of the engine. Having said that I think I'm right in saying pulse tuning is not as critical for a forced induction engine as it's not so crucial to scavenge exhaust gases from the cylinder effectively on the exhaust stroke when you have a pump cramming the air/fuel mixture in on the induction stroke rather than just relying on atmospheric pressure to fill the cylinder.
Anyway I've *exhausted* my understanding of this subject now so I'll shut up!
Chris
Edited cos I said *with* when I meant *without*
>> Edited by chris_n on Thursday 9th March 18:47
As most of the available systems for the Toyota engine don't change the manifold AFAIK, then weight/looks/sound are really what we're buying when we fit replacement exhausts from the cat back. So if as I believe is the case the manifold is the same between the normally aspirated and superchared cars then I'm sure the same aftermarket exhaust can be used without much impact either way.
If you really wanted best possible performance you would mess about with the tuned lengths of the manifold pipes so they are optimum for the specifics of the engine. Having said that I think I'm right in saying pulse tuning is not as critical for a forced induction engine as it's not so crucial to scavenge exhaust gases from the cylinder effectively on the exhaust stroke when you have a pump cramming the air/fuel mixture in on the induction stroke rather than just relying on atmospheric pressure to fill the cylinder.
Anyway I've *exhausted* my understanding of this subject now so I'll shut up!
Chris
Edited cos I said *with* when I meant *without*
>> Edited by chris_n on Thursday 9th March 18:47
Thanks! I'm afraid I got bit by the bug at a young age and have spent most of my time and money messing around with cars ever since (probably like most people on here)!
I left some of my earlier efforts off the list - rusty minis, escorts, fiestas etc (even a metro
), but they were all just as much fun in their own ways. I'm beside myself with excitement waiting for delivery of my Exige S though! 
Chris
I'm afraid I got bit by the bug at a young age and have spent most of my time and money messing around with cars ever since (probably like most people on here)! I left some of my earlier efforts off the list - rusty minis, escorts, fiestas etc (even a metro
), but they were all just as much fun in their own ways. I'm beside myself with excitement waiting for delivery of my Exige S though! Chris
Gassing Station | Elise/Exige/Europa/340R | Top of Page | What's New | My Stuff