Im aware of that, and it is the truth. But for some reason it doesnt seem to be the deciding factor with these things in terms of how efficient they are.

 

If someone isn't willing to give up a little creature comforts for performance, and not willing to mod your car with maximum performance and gains in mind - instead of comfort or something such as an annoying sound.... you or anyone else not associating the noise with a like or a dislike - just might not be in the market for a dump.


Check out what Ryu is doing, he's recirculating his. Performance and no noise. I personally love the sound and it doesn't bother me, so I run it open.

 

The answer is very simple the O2 dump gives you quicker spool for a extra 15- 20 more hp but a good tuner and well ported O2 housing will make it within < 10 hp difference. Hence The diffrence of opinon is it really worth it you can just turn up the boost not to mention some other little tricks and get that. Those that put the O2 dump to use are trying get every last thing out of there set up. That's how you set & break records. If you were to do the pros and cons of the O2 dump, the benefits far outway the cons for race applications.

 

Factor cost in too I suppose...is $470 for Shearers dump housing or $350 for MAP's worth 12-15more hp over a $220 for a ported/coated regular o2?

I dont really mind spending the money on a part that will absolutely show a nasty gain over a regular o2, and Ill have absolutely no problem at all with the noise.

 

I think that a well designed 02 dump will outshine a well designed O2 housing at boost levels over 28 PSI. This is just a guess and as such is worth squat: The O2 dump must include an open radiused true 3" DP bend and a large diameter dump tube as well. Not all O2 dumps are created equal!

 

Shearers exhaust outlet is a 3", correct? I know the dump tube portion is 2", but whats the exhaust outlet?

 

You might as well add in your guesses. this thread is full of them..

 

just get the QTP cutout you get the best of both worlds

 

i know maperfromance is a tru 3 inch downpipe , im not sure the shearers is a 3 inch

 

Any O2 housing that bolts to a factory location downpipe has to taper back down to 2.5" at the downpipe flange, therefore there is no need for the 3" tubing that some tout as an advantage as all it really does is create a bottleneck and hinder flow. Our O2 eliminator downpipes are true 3" and I believe Shearer now makes an O2 housing + downpipe combination in 3" as well.

 

^ Chris is correct. The Shearer is a true 3".

This post can go on forever but nothing is better than a dump, period. I don't care how good of a recirc setup you have. You are still cramming all the wastegate air into the exhaust creating a lot of unwanted back pressure.

Mikey

 

havent seen the shearer 3 inch yet , were are they ??

 

Not sure if they are for sale yet... Call Shearer and ask him.

Mikey

 

Just to clarify the Shearer housing most people in this thread are referring to tapers back down to 2.5" to bolt up to a factory location downpipe, the 3" version requires not only the O2 housing but a custom v-band 3" downpipe as well.

 

So MAP's o2 with dump tube, the exhaust outlet doesnt have the bottle-necking issue?