Just build a true 3inch exhaust system Brett. Doooooo eeeeeeeeetttttt!!!!

 

due to the current revelation where does that put the 57 trim upgrade at? What would you say is its true potential with a full 3" exhaust outside of a final dyno Brett?

 

yeah brett do a full 3 inch from the turbo back, either have someone build you one or buy a kit. I love my Agency Power exhaust!

 

I still think the 57 (or any wheel of similar flow) is the absolute best upgrade wheel for the Greddy turbo . The 60-1 wheel has much more top end potential but even with the exhaust opened up the car still feels sluggish low down by comparison to my old setup.
To get the 60-1 (or the 57 for that matter) to perform you need to do what I have done with the wastegate . This is the main reason my setup makes so much more power than anyone elses . I have explained how to do this on numerous occasions but don't recommend it unless you have an engine built for boost.

As for what is the potential - 350whp with the 60-1 and an optimised greddy kit is totally doable .

 

Is the AP a true 3" or does it neck down at the join with the midpipe like most sytems do ?

 

I always said that you had your head buried way down under ...

 

And I always said what i still say about you too .....................

 

I was referring to that too

 

The AP is not a true 3" from what I recall. My Turbo XS is but then I have the BHR midpipe so the resonator has to restrict it a bit I would think. I'm not sure any of it makes a difference though. I have been thinking of slapping the Turbo XS midpipe on and see if there is a difference in the butt dyno.

 

you guys need to get out more often ...



or you can just hard pipe it with a clamped slip-fit connection

 

I would call it a true 3" exhaust

 

Hmm, I guess I was thinking of a different one. Do they only make one version? I have installed at least 10 different RX8 exhaust systems and I could have sworn the AP I installed last as like 2.5" or something. But obviously the pic you posted is 3" so maybe I am thinking of an Ebay one or the megan. I do know tbk here locally had the AP and the tips looked like **** after a month since they are just thin sheet metal tips.

 

how about at the join with the midpipe ?

 

of course you would, but it's not

neither is BHR

they neck down to the OE donut size in the rear and also for the exhaust manifold/header connection in the front

not only that, but at the rear they don't even neck it down properly with a reducer, they just run the 3" pipe into a flange with the smaller hole and donut pipe size on the discharge side, which is the worst possible flow connection. It acts as a restricting orifice that way. You can just cut that off and replace it as per my earlier post


.

 

what do you think the 57 would have put down with a full 3"


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I disagree teamrx8,
I made a custom 3" downpipe that connected to this 3" flange however that ID might be 2.5. in that case you may be right, but your part would fix that, I wanted to keep that OEM bit so I could go back to OEM stuff.


then looking at a comparison of a stock cat vs an ap midpipe. it seems the OEM donut is 3" despite being 2.5 inch pipe


so I say its really close to a true 3" exhaust.

 

that is my only complaint is the thin titanium tips, but if you take care of them and polish them with metal polish they shine very nicely, just don't use any abrasive like sos pads.

you can always sand off the blue tint and polish them to be shiny "chrome" like, or you can take a torch and reburn them.

 

Well the tips are not dual walled or cooled like others so no matter how much you polish them, the look like **** again soon after. I worked hard to keep my hks tips looking good but it was a losing battle. My turboxs tips look great after several years.

 

so did you change to the complete turboxs?
is the turboxs all 3 inch pipe, it appears to be cheaper, if so brett you should get that!!

 

The oem donut is 2.5" ID . Looks like the AP is the same .

 

Well - I'm not sure if a 3" exhaust will improve it as much .I'm thinking 300-310 is about the limit for the 57

 

Interesting, I never took note of that. I wonder if there would be any benefit to at least deburring the flange or trying to blend the ID to be more conical for better flow. Then again, the labor would more than likely outweigh the benefits.

 

Just did another test to try see if the 2.25 rear pipe was the restriction or the muffler . Not hard to see which it is .......................


Green line : everything connected
Red line : muffler disconnected only , rear 2.25" pipe still in place .
Blue line : rear pipe disconnected - stock midpipe only .






Sounded real sweet with the muffler disconnected though

 

Holy ****... Thats a significant loss of flow through almost the entire RPM range.

I am even more pumped to install my 3" Vband out DP and make my system a true 3" all the way through...

Also I am copying most of your setup except I am going with OEM FD seals

 

Don't forget the stock midpie was still in place - dunno if more is to be gained by going 3" all the way but I'm already well over 200% load in places , which is not ideal ,so maybe i'm better to leave it .