adjustable exhaust valve!!

[dmhperf]

I manufacture electric valves for bypassing the muffler. My son has a 91CRX and wants me to design one for it. He says it would be a hot seller. Is he right? Figured this would be the place to ask. Has a switch you mount in the car that opens and closes a valve for more hp. What do you guys think? Is this a mod you all might be intrested in? Thanks, Dave

[SiN-6]

what exactly do u mean electric valve bypassing the muffler?

[dmhperf]

It is a Y that you put in your exhaust anywhere before the muffler. They are called cutouts. One end of the Y goes to the muffler, the end other has my electric butterfly valve on it. When the valve is closed the exhaust goes through the muffler like a normal exhaust. When you open the valve from the drivers seat it gives you a straight exhaust. I hope I explained it ok. As soon as I get one built for my sons CRX I will get some good pics of it for you guys to see. My son told some of his friends about it and everyone of them want me to build them one too.

[SiN-6]

why would u need 2 exhaust in a car anyways??????
to pass the cop inspecting?
actually the mitsu 3000GT have the same system as u discribe b4 i think
i wont get it personally..

[dmhperf]

What you are actually doing is adding this to your existing exhaust. Its just a way to make it adjustable from inside the car.

[Daniel]

don't domestics do this same sort of thing? i think i've also seen this type of thing in a Summit Racing catalog for Fords and Chevys.

[Chris]

I believe the VR4 does this stock.

[LETHAL GST]

what the vr4 does is instead of having the the exhaust pass through both mufflers, you hit the switch and everything is sent out through only muffler. what i think the guy is trying to tell us is that he makes an exhaust cut out. some of my domestic buddies have this on their cars.

[TheCamel]

For a complete explanation what this unit is for. This is for individuals that want to run an open header type system. When the unit is in one position exhaust flows normally through the cat, and through the muffler and out the rear of the car, when switched the exhaust is routed right to the ground. This will definately make the exhaust louder, and also causes loss of low end torque in N/A cars. Another drawback is that when the unit is open Carbon Monoxide fumes are released underneath of the car, which if left idleing for long periods of time can cause Carbon monoxide poisoning and even death. not to mention loss of backpressure that your car needs to flow the exhaust correctly and keep from burning up exhaust valves. For old muscle cars this was a decent hop up, but for a normal import with 2 o2 sensors this will acctully decrease performance, because the second o2 sensor does not read the correct gasses while the engine is running. I would not recemend this for a computer controlled vehicle. And as far as I can tell if you are caught with this type of device in California its a BIG fine, you are basically defeating the emissions system, which as we all know the environazi's hate. Your choice. just giving you the perspective from a mechanics point of view.

TC

[Chris]

well since i dont think hes talking about the cat at all here, it has nothing to do with emissions. But who checks for cats anyways? Ive only heard of that LA bust where they checked. But if it is only for the muffler whats the point? a louder car with less backpressure?

[dmhperf]

It goes after the cat.

[fC3s]

Dont listen to some of this BS people reply with.
Not being mean but this wouldnt sell IN MY OPINION..

it wouldnt help much for people with aftermarket exhuast, BECUASE, they dont have much backpressure anyways.

This would work BEST for the turbocharged vehicles..
where you could mount it after the down pipe, where you WILL see an increase of boost, up to 5 or more PSI..
BUT.. this would be dangerous..not from carbon mono into the car, but if you know anyone with a REALLY modified car, you WILL get large flames and backfires constantly.

We have made a system like this, but the exhuast dumps out behind the front wheel, and its not electric. we just welded a flange with bolts to a plate...

[SiN-6]

in theroy..
a NA car might work out fine..
a car with a big T.. no.. i have the high end horse power. and i can live with no back pressure.

peace

[RiddlerGt]

If you want a cutout go to your local muffler shop and they will weld one on, most of them are just have three little wing nuts that hold the plate on when your racing crawl under the car and take them off. Also about cats no LA is not the only place that checks for them so does melpitas so be carefull, If you get busted and you fire your car up and it seems a little to loud all the officer has to do is kneel down check for cats if you dont have them it a 500 doller fine, its also some gross poluter problem.

Nate
88gt

[FiveSpeedIntegra]

wouldn't that screw up the flow of exhaust to have a half used (half used meaning one side or the other at a time) y in the middle??

[fC3s]

Yes it would.

[RiddlerGt]

The flow of the exaust would be exiting earlyier no restrictions like a muffler make more hp, but on lightily moded cars you can loose hp from not having enough back pressure.

Nate
88gt

[FiveSpeedIntegra]

Originally posted by RiddlerGt
The flow of the exaust would be exiting earlyier no restrictions like a muffler make more hp, but on lightily moded cars you can loose hp from not having enough back pressure.

Nate
88gt


no no no...i know it'd be exiting earlier if it were on the open side, but running it closed (through muffler), you'd be ruining the flow of exhaust by having a slight notch (for lack of a better word) on one side...like a kink in the pipe. that's can't be good.

[joeelutz]

I think this product would be great for those who race their cars on the weekend and drive them to work through the week. It would eliminate the need for expensive high flow mufflers and such. Nothing is less restrictive than no muffler at all! I would guess it could be made to go either before or after the cat. The question I have is would there be any problems with sealing when the valve is closed? I hate exhaust leaks. I also know that the traditional design for exhaust cutout valves were bad to leak past the closed valve.

[jexser]

That may cost a tenth of a horsepower. Not a real BFD.

This would definatley help anyone who has a higher compression engine. (11.5 to 1 compression or decent amounts of boost.) This would be like having an open down pipe, like the racers have.