Street and half bridge porting
#1
Mazda RX8 R3 2009
Thread Starter
Street and half bridge porting
Has anyone had a street port or even street and bridge port done. To their r3?
I it's a question as mine is about to be rebuilt and I have the option to do either or both.
Basically my car is a daily driver and to work each morning and evening takes 20-30mins drive.
It has to be reliable but what are the pros and cons doing this to the r3 and will my daily work drives including these affect things for the worse?
Many thanks
I it's a question as mine is about to be rebuilt and I have the option to do either or both.
Basically my car is a daily driver and to work each morning and evening takes 20-30mins drive.
It has to be reliable but what are the pros and cons doing this to the r3 and will my daily work drives including these affect things for the worse?
Many thanks
#3
Mazda RX8 R3 2009
Thread Starter
That's exactly the response I was after, have to be sure I have the most reliable outcome, I'm also looking fitting a toyo manifold and the 3" pipes back from that, kn panel filter and the d585 coils, it's just a shame I can't find anyone that remaps the r3 once all done!
#5
Gold Wheels FTW
iTrader: (1)
Yea, the results are hit and miss. I daily drive my bridge ported engine, and I have over 60k miles on it. I don't abuse my car though, and I'm particular about routine maintenance.
dannobre is very right. The results are hit and miss, and as far as I know, mine is the only one that has survived any length of time. At the same time, any porting to the renesis is all but pointless as I have very minimal gains if any at all.
With the fact that even on a stock port renesis, I have seen 180~210HP on fresh engines, it would be almost imposable to determine if my porting contributed more than 10HP.
For my bridge, we did put my apex seals in backwards to keep the corner piece from ever falling into the bridge, but that's a pretty common / old trick even from the early RX7 days with 2 piece seals.
Good luck with your setup. Hope you figure out what will work best for you.
dannobre is very right. The results are hit and miss, and as far as I know, mine is the only one that has survived any length of time. At the same time, any porting to the renesis is all but pointless as I have very minimal gains if any at all.
With the fact that even on a stock port renesis, I have seen 180~210HP on fresh engines, it would be almost imposable to determine if my porting contributed more than 10HP.
For my bridge, we did put my apex seals in backwards to keep the corner piece from ever falling into the bridge, but that's a pretty common / old trick even from the early RX7 days with 2 piece seals.
Good luck with your setup. Hope you figure out what will work best for you.
#6
Boosted Kiwi
iTrader: (2)
Has anyone had a street port or even street and bridge port done. To their r3?
I it's a question as mine is about to be rebuilt and I have the option to do either or both.
Basically my car is a daily driver and to work each morning and evening takes 20-30mins drive.
It has to be reliable but what are the pros and cons doing this to the r3 and will my daily work drives including these affect things for the worse?
Many thanks
I it's a question as mine is about to be rebuilt and I have the option to do either or both.
Basically my car is a daily driver and to work each morning and evening takes 20-30mins drive.
It has to be reliable but what are the pros and cons doing this to the r3 and will my daily work drives including these affect things for the worse?
Many thanks
#11
Rotary Evolution
if it wasn't nearly impossible to block off the side port exhaust i wonder how the renesis would do with a simple PP exhaust. backpressure would be lessened but only to a degree, which should open it up more for top end power but at a cost of low/mid range.
Last edited by Karack; 03-13-2014 at 03:16 PM.
#12
Registered
You mean something like this?
https://www.facebook.com/photo.php?f...type=1&theater
This one will have a turbo on it, but the idea is the same.
https://www.facebook.com/photo.php?f...type=1&theater
This one will have a turbo on it, but the idea is the same.
#13
No respecter of malarkey
iTrader: (25)
^^The problem with that is they clearly haven't thought through whats going to happen with the exhaust port cavities relative to exhaust pressure, more so if the engine is boosted . Essentially they will be huge EGR reservoirs. It makes much more sense to do a 13B conversion than go there in the first place. The idea itself is old and has been tried before.
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#15
No respecter of malarkey
iTrader: (25)
The issue there is how do you get something to fill them that won't possibly crack, chip, and break off long term since it will be exposed to high temp exhaust gases. Welding them shut leads to warped side plates and again a risky failure point. An idea was even floated to fill them with molten metal, but it's not permanently fixed in any way and can still be a risky failure point. Ultimately it's just an expensive ticking time bomb. If they figured it out I wish them well, but how does it make sense over a 13B turbo that can crank out 450 - 600 hp? Thee might be an NA advantage of decent low end drivability with better top end power, but the mod in itself bumps you up in most race classes where staying NA doesn't make sense and you could ultimately make the same argument for a street car too. If someone would offer aluminum Renesis 6-port side plates less the exhaust ports then it may be a viable option. It's not a new idea though and the limiting factor has always centered around the side exhaust ports in the OE plates.
Of course in Turblown world hitting a dyno number and blowing up is considered a smashing success. You might feel different if you're the person who just dropped $8k+ on the motor ...
Of course in Turblown world hitting a dyno number and blowing up is considered a smashing success. You might feel different if you're the person who just dropped $8k+ on the motor ...
#16
Bridge port
Hey guys I'm new to the site but I was wondering if anyone new of a place in Minnesota to get a bride port done with someone who has experience doing it would be even better and how much they usually charge and if I pulled the motor and prepared it for them If it would be cheaper thanks
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