Yeah, I know it may not be the exhaust system, but i'm running a stock S5 turbo which is in good condition so and I would expect to be watching out for boost creep not choke. The exhaust on there now is 2.5 or 3 inch downpipe to a 2-2.25 inch test pipe/glasspack that goes from just after the bottom curve of the downpipe to just before the Y and then stock cat back. This was installed by the previous owner for god knows what reason!!! Exhaust is one of my winter projects and I am probably going to make something similar to the racing beat turbo back system... i'm just making a slightly different Y section.

 

I had one of those on my 240sx back in the day.

I have to say that it world pretty damn well. I had it on a 85 mm pipe and when the plate was closed it was as quiet as stock. It was controllable from the cabin so that was another plus. The butterfly valve is not dependent on the throttle you actually have a small controller.

I did it's job, When I had an N/A and in flap was closed my butt-dyno sensed a bit more torque as well.

 

this is better.

http://www.quicktimeperformance.com/QTEC/index.php

 

gotta love theories on how to make the best NA power.......gotta keep those pipes mad restrictive y0!

 

I DONT WANT A ******* CUT OUT!!
'
thats been discussed before, i dont care if you THINK ITS "BETTER"

and what are you talking about with making NA power??

restrictive??

how much for a street car?

it would be closed for around town, and cruising

 

You have a stock cat?!

That's the problem right there. It'll be completely clogged to **** at this age. There rest of the exhaust is less than ideal but it's not the cause of your problem. I can't believe after all your talk above you couldn't see that...

 

You need to start reading my posts before you reply!!! Stock CAT BACK!!! As in the part of the exhaust system that is back of the cat is the stock system!!! There is no pre cat, Cat, Air pump, crow's nest or ACV on my car.

READ BEFORE YOU REPLY!!!!

 

Oops, my bad...

Still, the stock cat-back is probably just as bad. Boost that trails off at high rpm is a well-known effect of the stock turbo with a stock or partly stock exhaust. It's perfectly normal.

Going back to the original point, an open exhaust valve is going to cause a tiny fraction of the restriction your cat-back currently does.

 

I actually like the idea a lot. The way you can control the loudness of your exhaust. But you do have to drill a hole somwhere for the cable.

 

Yeah I am aware. The previous owner did a number of mod's to the car that were just plain stupid so there is a long list of things to be done. Time/money/me being picky are the issues as to why nothing has been done yet to the exhaust system.

I am ok with the idea of a valve like that being stuck after a Y as to open up an alternative passage for the exhaust to flow. I do not like that idea of having that in the middle of a single exhaust... unless it is in the exhaust tip.

Try to watch your words before you say someone is wrong. I know my car is far from the ideal, but I have a pretty good idea about the direction it needs to go to be a lot better.

 

You don't have to like it, you just have to realise it won't have anywhere near the negative effects you're claiming.

Apart from the slip-up about the cat, I stand by everything I posted above. A lot of what you said is simply wrong or not relevant to the situation.

 

THREAD RESURRECTION


i just got mine in the mail today, its the 80MM flange type, i will be taking video of before w/ stock turbo back, and 3in open, and 3in closed.

 

i ordered in the pipe type, hopping this fixes my prob too br sure to post that vid. would be awsome to see if it works.

 

old thread, there are a few youtube videos for examples if you guys havent seen them.
How they sound like with duals..
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Idle open and close operation
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Free Reving w/ single straight pipe (best comparison of noise reductions)
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Same R32 Incabin operation with free reving and ECV pull control valve.
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/wV3iOml9s1g&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/wV3iOml9s1g&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>

 

i have done something similar to the ecv.

https://www.rx7club.com/fabrication-250/exhaust-control-valve-806440/