Originally Posted by Silver_Surfer
(Post 2992711)
I'd like to see a 8 dyno'ed before I become a beliver(Kepping an open mind). Untill then to me it's like removing your airfilter from your stock airbox= more flow.
btw: I have two cats, one gutted and one thats not. I have switched back and forth. Their is almost no differents in noise but the gain is noticeable. If I could gain 1 more HP I would buy a midpipe. Untill then...... Again, the only real data I've seen in this thread shows that the gutted cat produces less power. I'm not sure how people can still argue this fact without bringing real data to the table. And Bose, very interesting test with the filters as well. I agree that there's no way in heaven I'd remove the filter from my car! |
Originally Posted by YeahYeahYouWere
(Post 2992419)
http://www.importtuner.com/tech/impp...ion/index.html
That's the link to the import tuner article where they test it on a Miata. With the cat intact, they get 104.1 - with the cat gutted they get 103.0. Meaning gutting the cat actually decreased horsepower by 1.1. I'm not saying that what happens in a Miata has to happen in an RX8, but that's the only hard evidence anyone has presented thus far. Ether way, id like to see proof of loss or gain, especially with the gains you claim on the gutted cat... I doubt itd be much if any |
Originally Posted by bose
(Post 2992797)
Why the fuck would you remove the air filter. That's got to be the most asinine thing I have ever heard of in my entire life. Even if you gained 10 hp why would you risk getting all the shit that's in the air in you engine.
Oh wait, Import Tuner did a test on this: http://www.importtuner.com/tech/impp...wer/index.html But they don't know anything do they.:jerkit: Relax and take your meds. Just an example of restriction.:lol: |
If you read the article it says it's not a restriction, a proper filter will suck in more air than an open air box.
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Fluid dynamics? Whats that?
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Originally Posted by Silver_Surfer
(Post 2992711)
I'd like to see a 8 dyno'ed before I become a beliver(Kepping an open mind). Untill then to me it's like removing your airfilter from your stock airbox= more flow.....
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OK sooo I guess I'm just going to have to try one for myself. Why does everyone seem to hate the OBX midpipe? I dont want to search. Anyone have one?
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Originally Posted by ndhoffma
(Post 2993101)
Fluid dynamics? Whats that?
Fluid dynamics and vibrations/resonance. |
Originally Posted by RawrX8
(Post 2993107)
I did this at the track last weekend and lost 3mph which is a good amount of loss hp. I did atleast 5-8 runs with it out. Also did another 3-5 runs with the airbox propped open. You have to try stuff to seee if you can gain a extra MPH or .1 E/T.
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Well, Just ordered a mid pipe. I'll get back in a few weeks...
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I guess my point of view is if you have the cash to go turbo you have the cash to at least get an rb pipe.. having a mid pipe is just as useful as a BOV IMO.
Maybe I'm off but I would much rather sell my stock cat for $200 and buy a $125 mid pipe. |
Originally Posted by Silver_Surfer
(Post 3004674)
Well, Just ordered a mid pipe. I'll get back in a few weeks...
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Originally Posted by shadycrew31
(Post 3004935)
I guess my point of view is if you have the cash to go turbo you have the cash to at least get an rb pipe.. having a mid pipe is just as useful as a BOV IMO.
Maybe I'm off but I would much rather sell my stock cat for $200 and buy a $125 mid pipe. The reason was because I need to keep my car as quiet as possible (cops in my area are bad) and the only way to accomplish that was to gut the OEM midpipe. I could have gone with a Mazsport midpipe but I did not like that you need spacers for the cross members. |
Originally Posted by YeahYeahYouWere
(Post 3004948)
Midpipe numbers are all well and good, but that won't settle the gutted vs. non-gutted CAT debate.
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Originally Posted by turborx8
(Post 3005095)
I did not gut my cat because I could not afford a midpipe.
The reason was because I need to keep my car as quiet as possible (cops in my area are bad) and the only way to accomplish that was to gut the OEM midpipe. I could have gone with a Mazsport midpipe but I did not like that you need spacers for the cross members. |
OK, its been awhile now since I installed a catless midpipe. I gotta admit theres more top end power. To the point where the vehicle revs past the redline(Easy) and sometimes kicks on the fuel shut off on late. The only minus was there was a rasp sound at around 2000 rpm. Belive it or not I got 90% of the rasp out by wraping the pipe with header heat wrap tape.
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i think that happens because the wrap is muffling a bit, where as the stock pipe is thicker, but i am just talking out my ass
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