awesome to hear! i can't wait to see the 220rwhp that u believe the NA can make! u can do it scott! haha i can't wait. im excited with all this going on ahha.

 

Just in case some people don't realize how good the Renesis actually is, let's compare it to the last nonturbo 13B which most RX-7 people would rather have for some reason.

Remember this engine had no internal work done, stock intake manifold and stock exhaust manifold. The best streetported nonturbo 13B's I've ever seen have only just hit 200 rwhp with custom intakes, standalone ecu's, headers (which actually do something on those motors), ignition upgrades, etc. Those engines have some decent port overlap which effects economy, emissions, and power under lower load levels. Why some people can't get over the fact that overlap is always a good thing is beyond me.

Imagine what we'll see when someone actually properly does a nice port job and really focuses on the exhaust ports. The intake ports do not need to get any bigger. A light flywheel will also show a little more power at the wheels, but not at the crank. What actualy gets to the ground is what makes you faster though. I see no reason why we won't see 225+ rwhp and possibly more when everything is optimized.

 

I'll believe that's the answer when I see it done successfully

 

It looks like 220+ is possible from the dyno graph, but you'll probably have to open it up and port that exhaust port, the slope going up to 7000rpm is impressive but goes alomst flat after that, its most likely the flow problem, solve that, we might see that slope continue to run up to 9500rpm, which will hit some very high hp #
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Is that car you dynoed going to run in GS class this weekend at VIR?
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Awesome! I hope you'll take all your hard work and package it into a 500 dollar flash for those of us who can't spend 2k on a stand alone computer

HEY, I can dream right?

 

All the continued talk about the exhaust ports makes me wonder just how intentional this was by Mazda. In other words, re-working the ports for a bump in power in the RX-8 will be easy if you leave a little bit out the first time around.

For some reason, I think I've posed this thought on the forum before, but can't remember...

 

Not to throw a wrench into your dream but I noticed that this chart is STD corrected. All the others were SAE. Sorry.

 

He's at sea level anyways. Mostly just need a temperature correction.

 

I dont think its intentional. Remember that the engines are mass produced. Cost always comes first, its relatively easy for them to drill out the exhaust ports at a 90degree angle, its the most cost effective.

its a lot more complicated to mass produced smooth out exhaust ports that are optimal for flow. It just doesnt make any business sense for them to do this. We can only depend on the aftermarket for porting, you'll never see one from the factory, not even future RX-7s. Unless they are like 100k super cars that are limited in production and are built entirely by hand lol
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The housings are sand casted. The port openings are not a part of the cast. After the housings are pulled out of the molds, a cnc will go back to smooth out the bearing areas and housings faces. In the process the machine also cuts out the port opening. They just haven't been terribly accurate about how well the cnc cut lines up with the casting. Actually I have that backwards. They haven't been accurate on the casts. The port openings correspond to a predetermined port timing so they have to be cut at certain points.

 

So then all the cheap bastards have to do is put a core in there for a nice exhaust? There must not be alot to gain there or they would have done it.

 

Yeah pretty much.

Don't give them too much credit!

 

Lets hope they do for Renesis-II lol
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^yeah...it should come out by 2025...lol

I'm a dreamer too...but our wallets don't lie...right, lol.

 

im beginig to belive the car I saw putting 232 whp was ported or something

 

If Mazda can come up with a slightly better Cat design that can take the heat of a leaner mix along with some small port changes we might see an increase from the factory.

I think the first time around, they were limited budget wise as far as some of the components, they may have just ripped a cat off the shelf so to speak cuz it was cheaper than working to design a better one.

I can see the Mazda add slogan now, the 250HP RX8 (we really mean it this time)

 

Did anyone notice the torque curve at 7,000rpm, take a closer look when compared to other N/A charts. The #'s are higher and the torque curve is much broader which will produce better real world results. Scott

 

Well, you really don't need all that on the earlier 13b's ALWAYS. Remember Kahren's engine. Stage 1 port on intake/exhaust (fairly mild), with s5 n/a rotors and n/a irons, stock exhaust manifold with 2.5" downpipe, 2.5" test pipe, RB catback, TII manifolds port-matched to 6 port block (which is really a worse setup in my mind since it had to be hacked up to fit, but it was for a future turbo project), hot-air-intake cone filter, stock ecu with S-AFC.

That was it, everything else stock, high 195rwhp before redline because it ran out of fuel and was getting too lean.

Still doesn't matter, Renesis has much much more potential if done properly. Just felt like inputing this

 

On a quick side note with all the leaning out of the fuel (i assume) you are doing, if you had a straight mid-pipe what kind of gas mileage increase could you potentially get from a performance NA map on the interceptor? with gas going towards 4.00/gal $1500 bucks doesnt seem alot to increase mileage by 10-15% especially over an extended period of time.

 

NA tuned 13B's could get 21mpg in the city, so I would hope I can hit that with the Renesis. I don't think the midpipe would make much of a fuel economy difference, but it will be my next mod as I don't want the lean AFR to burn out my stock cat and cause issues/

 

Thats just what I meant, add the midpipe and lean the AFR so the cat doesnt get burned out.

 

rich fuel mixtures burn out a cat converter, not lean, that's why there have been so many cat problems

 

Overly rich mixtures will burn out a cat because excess fuel is being dumped throught the exhaust where it ignites inside the cat. However overly lean mixtures burn hotter which will also kill the cat. You need the correct mixture range to keep the cat alive.

 

yes, but you're talking 2000+ degF sustained WOT on the newest metallic converter technology to do it which is not easy in an unported renesis, lean or not

maybe they're using cheap cats ...