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

You can do a street port and be ok...I wouldn't do a bridge for a daily driver...especially on a Renesis

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!

The bridgeport attempts that I see posted about here on the forums have a pretty high rate of failure, and even if it does work the gains over a nice street port are pretty minimal.

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.

The reason why any sort of porting has minimal gains is that the main flow restriction through a Renesis is at the exhaust ports . And there is very little porting that is possible in that area .

Sadly... How bad do you think the heat would be even if you made a custom iron with larger exhaust ports? Expensive hypothetical...

I would be really interested to see how well a renesis would go with a couple of small peripheral ports bored into the housings ......................... Like what
Mazdatrix did , but NA .

Yes small and very low so its still 0 overlap

Any peripheral port will still give you some amount of overlap. Besides, overlap isn't always a bad thing.

you can always move backwards and use the old PP exhaust housings from a 7, but the manifold is ridiculously complex.

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.

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.

^^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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I'm not 100% sure, but I think the side ports are filled in.

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 ...

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