Celica Forums General Discussion Exterior Kazuma w/ exhaust control valve

just wonderin what everyone thinks of this. it kinda acts like a silencer you can switch on and off from inside your car. looks like it would work great for those who like the power a kazuma can offer but not the migraine. theres a link to it... http://www.arospeed.com/default.php?cPath=22_43_45&osCsid=b6eb516e4978e79b5e0693e035a9157a

not sure if they even make it for the celi but could be interesting

exhaust control valve= waste of money-----kazuma exhaust with a removable silencer = more hp/loud (without silencer)

the point is it's instant on/off and it works. it does cut down on the migraine and I should know lol. I've also used it with a short exahust system consisting of a muffler right after the CAT. That setup is MUCH louder than Kazuma and the ECV drastically reduced the noise level. Now I have a custom exhaust w/o resonator, and the ECV muffles that nicely as well. btw the ECV is a much nicer, softer sound that the metallic tint of a silencer. I detest the sound of silencer. Sure it may be quieter than w/o silencer, but the sound is so nasty and impure people or cops still look your way.

The ECV won't hurt your peformance any more than the plate in your throttle body hurts your intake air flow. and you can set it up so it can be removed. it's called welding flanges around the area where you want it installed. The ECV itself has flanges.

I have kazuma, and the silencer really doesnt help quite it down either. Ive tried both , with it in and out. Sound about the same. I just took it out because it rattles. (tightened the bolt as tight as I could)

which has more performance gains???? a kazuma exhaust or a custom exhaust using the 60 mm apexi NA exhaust???? also which one is louder

(this would be on a gt)

i would jsut stay with the stock exhaust but remove the resonater and then back on the passenger side by the rear tire weld in an electric exhaust cutout then you will have a pretty open exhaust when you hit the botton but can go to a quite exhaust

only donw side with any of these is the fact that are ecu needs some miles to correct everything

^^ unless you have a PowerFC. downside to keeping the stock exhaust on your car is that it's heavy.

prolly kazuma would show more gains (doesnt have a cat, it header back) Its pretty loud too. It might get on your nerves driving down the highway

could it be applied to a custom dual exhaust set up? using a borla type system?

you mean the ECV? sure, but I'm not sure if you'll need to.

yeah the ECV. y wouldn't i need to? not loud enough to matter?

you can see how loud first, and if need be get the ECV.

would the shop know where to get one? or will i have to order one and have them custom fit it?

no they probably wouldn't know where to get it. Buy it from AroSpeed from the website or call them and have the shop weld it in. If you scroll up you'll find the site.

what kind of gains will a cusotm dual exhaust get? anywhere close to kazuma? i just like the look of a dual, but the gains are really more important.

also, would they just cut the pipe and make it more of just a Y pipe to make it look dual or do you think they would make or need a header that would make it true dual exhaust (or at least as close as you can get with our engines). like the DC 4-2-1 design on stop it at 4-2 and make pipes from there... make sense?

dual is pointless

just looks good. looks more balanced.

yeah just for looks, pointless on one header cars. on that idea of making a DC 4-2, that's creative but you'll get even less performance. you'll probably get less exahust gas scavenging and decreased performance. dual exhaust could be good for V type engines with two headers.

you want a true 4-1 for best performance on our inline 4 with the standard 4 stroke cycle. there's always one exhaust stroke going through the pipe keeping the flow and scavenging up.

Speaking of exhaust systems. If my cat starts going because of the supercharger, What can I do to prevent the cat from going exhaust wise? Can I just go to a shop to get a custom exhaust set up and that will fix it?

I'm not sure what you mean by your cat going. do you mean that you think the supercharger will hurt your cat? I don't see why F/I should hurt your cat. I've only heard of leaded gas hurting cats.

I think it might have to do with raising the exhaust temperatures or for some reason their would be black soot coming out the exhaust. Matt at MWR said that he wasnt sure but it kinda looked like it was the beginning sign that my cat could be going.

then what kind of gains would i get with just a Y type dual exhaust? about what i would from any other exhaust? i know the shop i'm probably gonna go to uses borla if that helps at all.

you might see gains over the stock restrictive system, but most likely not as much as gains as a single pipe. You want the gasses to exit with the greatest velocity. A dual means the gasses have to come down through one pipe then split into two and head off in two different directions. That in itself means longer piping and a change of direction (over straight) which results in more restriction. Some restriction is good to create a scavenging effect in which the molecules follow each other out as if in a train. But any more restriction than a straight pipe (with the right diameter) is too much already for serious race cars. So for the performance minded, our goal is to get as close to the straight pipe and still make it streetable. Streetable means providing enough exhaust gas scavenging at low loads and keeping the sound within legal limits. An exhaust with too little restriction is not good for the street because the gasses do not exit efficiently at low loads. They just swirl around in the pipe and don't back up and push each other out. In order to go anywhere on the street with an exhaust that doesn't have enough restriction, you'll have to practically floor the accelerator pedal. And driving around at WOT is of course not practical. Yes you will get the most power at WOT with this low restriction exhaust, assuming it still has just the right amount of restriction to match the gasses coming (N/A, F/I?). So what's the perfect amount of restriction for a given engine at a particular load? I suppose a computer sci. person could make a simulation calculating the perfect length of piping and diameter, but really most people test and dyno tune to see what works best. Generally the aftermarket 60mm exhausts work great for N/A. Nitrous users tend to step up to a custom 2.5". People running big turbos might step up to a 3", and those running less boost might go somewhere in between 2.5" and 3".

There are two solutions to having the best of both worlds: the exhaust control valve or the exhaust cutout. The ECVs I have seen only come in 2.5". I have seen exhaust cutouts in 2.5" or 3" and you might be able to find diameters in between.

Borla is a good muffler brand. But again mufflers are meant to muffle not to increase performance. True drag race cars don't use mufflers. So what makes a good muffler is one that provides the most muffling without sacrificing performance. Generally, muffling and performance are inversely related. The straight through kind of muffler would be best for performance on a street car.

^^^^ thats a lot of info. so the short version is... go with kazuma and an ECV over a dual.

yeah just the reasoning and the background so it all makes sense. the kazuma or a custom mostly-straight, mandrel-bent exhaust will give the best gains. An ECV will quiet those down somewhat and provide more restriction for low loads during cruising.

will the kazuma pass an emissions test?

whether any car passes, there's a lot to consider. But yes I believe it can be on a car and pass. It might be closer to not passing, but I'm sure it can pass. An ECV can help the scavenging at low loads which the emissions test is done at. Things before the CAT like intakes and headers (in general, yes we have one header) play a bigger role in emissions as well as where your engine is running as far as A/F ratios which you can't adjust with the stock ecu alone.

Now the kazuma obviously won't pass a noise level test, but that is not done during your smog test.

no because it has no cat. they remove that when they put the kazuma on.

there's nothing that says you can't leave your cat on when you put the kazuma on. it's called cutting and welding.

but wont that cut your gains?

why did you ask whether it would pass smog or not?
yes of course having a cat restricts your exhaust flow.

I'm sure you if you want to get rid of your cat, you also won't mind inhaling the hydrocarbons your car will be putting out. you might notice at idle.

and you also wouldn't mind getting a check engine light from having no cat. you'd have to get an o2 simulator to take care of the CEL.

I'm sure that most of the people who get the Kazuma leave their cat on.

i'm sooo lost

so basically kazuma = no cat = no passing emissions

yep. ANd if you want leave the cat on kazuma then you might as well get reg trd exhaust, because having the cat on kazuma is stupid