Some of you will be aware that Borla have bought out an aftermarket cat-back exhaust system in the states. It's being talked about in the Mazdaspeed/Aftermarket Performance section of the forum. See the discussion here:

https://www.rx8club.com/showthread.p...threadid=12631

I'm very interested in getting one. This photo was just posted by speedracer. As you can see, it spits flames! How insane!

My question is - would this be street legal in Australia or would you get booked by the cops the first time you went for a drive at night? No point buying one if the cops make you take it straight off.

 

Doubt it.. but wouldn't it be great for tailgaters?

 

Bleh... bit too boy racer if you ask me... I reckon you'd get done in a heartbeat by the cops... course if they were standing right behind your car when they were writing the ticket, you could deal with them quickly

 

Great , puts new meaning on an aussie barbecue , eating on the run.

 

I'd be very surprised of that picture is the result of a big bore pipe and free flow muffler from an otherwise intact cat forward.

Imagine the bushfires you would start with that - insane!

That'd never be legal, but I can't believe anyone would hassle you after they saw that! :D

 

Can't wait to see the look on the police face when they stop you for Emission and Pollution test. They have to attach something inside the exhaust tip I believe!!:D :D :D

 

Here's the video courtesy of "Speed Racer".

Speed Racer's Borla exhaust Video.... (right-click and save to hard drive)

Originally taken from the following thread.
https://www.rx8club.com/showthread.p...465#post151465

 

I'd be more interested in the kW gains than anything else. Otherwise, I hate to say it, but please forgive me... "Rice"

Cheers,
Hymee.

BTW - The little flames on the vid did look cool though

 

Regarding this pic...

http://www.geocities.com/subarumazda...e/mvc-002s.jpg

You can clearly see it bolts to the first flange after the cat. And that pipe from the cat is smaller than the cat-back. I would like to open the cat up (have the same size, larger, pipe running from the cat, both side preferably). Of course it is done this way so it a simple bolt up mod.

Of interest - the Holden V8 supercars have a small "restriction" just after the header pipe merge that they have found to increase mid-range torque. Not to say that is applicable to this mill though.

I'm really curious how it would go coupled with a set of headers. Then the whole exhaust is done properly

 

haha, look at the last burst of flames in that clip, obviously not a lot left to burn, because it was pretty limp, so much so it was more of a vertical than horizontal flame... kiss that rear bumper goodbye D:D

 

I believe some have damaged the rear with the heat from the standard exhaust. (standard engine? I'm not sure).

At least if it was all standard Mazda would have to repair it under warranty.

 

As some of you may or may not know. The rotary engine design does allow fuel to get into the exhaust system & then be ignited. Hence the flames.

The pics & reports may be so, but it should not be a direct result of the exhaust change. That BORLA exhaust was way to loud to be a CAT-back only system. PLus the system would be near red hot to be doing that as proved by the little thrash session prior to returning & spitting them out.

By dumping extra fuel into the system, you make your RX prone to flame spitting on deceleration. I have seen some poorly tuned ECU's spit out flaming exhausts for up to 10-seconds straight.

It's a great party-trick & since picking your nose is probably illegal according to the revenue based State Gov & their puppet Police, you can bet there is a fine code in there some where for flames.

Having said that & owned various Mazda rotary powered machines since 1988 I have never popped a flame with a Cop around to be even suspected. Anyway. I would plead ignorant & say that I never knew it did that....:D

 

True. It appears that the flame thrower party trick takes some preparation. Here is what speedracer had to say on it:

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Don't worry, it doesn't shoot flames like that unless you really go out of your way to make it happen.

The reciepe to flames is:

Warm up engine

Get the exhaust red hot by running the car over 6k RPMs for several minutes

Come to a stop or at least keep it under 60 MPH (slower = bigger flames)

Rev it hard (WOT) and lift off on the throttle quickly

INSTANT FLAMES!!!

As you can see, it is not easy to get flames because the conditions have to be perfect to ignite the unburnt fuel. Likewise I have not seen any damage to the paint or body work on the car but your mileage may vary.

If Mazda ever corrects the pig rich fuel map the flames will probably go away for good.
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Given this, it's quite probable that you could get flames out of the standard exhaust if you did the same amount of 'prep' work.

DMRH, I like the idea of pleading ignorance!

 

10 seconds? bah :D I'm sure some of mine went for longer than that As others have said - you need decent amounts of heat in the exhaust before you can start doing that, and even then it will only happen in the high RPM high vacuum maps (above the decel fuel cut level). You dont do it when cops are around becuse 99% of us dont drive like that around cops anyway.

It's actually good for the engine (the extra fuel helps cooling) but bad for the plugs and disastrous for cats and mufflers.

-pete