I would say that the Renesis design allready allows the maximum porting for a street engine that is fully 'smogged'.

As was mentioned, highest gains for power would be

1. de-smog

2. free flow exhaust

3. adjustable fuel delivery


I suspect this would bring your Renesis to 300 hp with ease.

The way things go I would even bet on a bolt on supercharger that may take you to 350 hp or more.

On a new car????? no way ! hamx0r said best to play with old beaters. try this on for size... make an old 12A run backwards and turbo the intake through the exhaust ports. Looks feasable to me in order to increase the combustion time by 20 or 30 percent. might make a good boat engine, hmmmm

Re: Speculation On Tuning
 

Ya know, depending on how it drives, responds, etc. I don't plan on doing anything major to it. As much as I love the turbo in my Miata, and as a balanced of a car it is turning out to be as I'm developing it (brakes, tires, suspension, etc. in addition to the engine mods), I do miss the basic, simple feel that the car originally had. So if the car comes close to the Miata as having that balanced feeling, I'm going to be keeping it quite close to stock. Especially since it will be under warranty, and since I'll have a faster car on the side to take care of my "power-joneses".

With that being said, let's talk tuning! :D

Quote:

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...I will be waiting for lower compression rotors, hopefully down to about 8.2:1 or 8:1 so ...keep in mind though you will be losing fifty HP (approx) with low compression rotors...

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Although high compression pistons/rotors certainly do handcuff a car's ability to handle boost with pump gas, I don't know if you need to go that low for 15 psi. For a street car, I would personally rather gain a little bottom end and off-throttle/off-boost response and lose a little top end power with a little higher compression ratios, but that's me. I hate lag-monsters on the street, regardless of how much "top end" power they may have. And with those low compression ratios, it would be a lag monster IMO.

Quote:

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...Do some porting and based on what some FD's...

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Since the port relocation is the big difference in the engines, I wouldn't even start talking about port gains at this time.

Quote:

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...Add a good exhaust and you can benefit to about an additianal 10-20 hp, I say 15 for arguments sake...

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I think you're mixing basic NA benefits and turbo benefits. You would already require a properly sized exhaust setup to reach the gains you are already talking about.

Quote:

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...Add an intercooler and get another 15...

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Same as the exhaust. At 15 psi on pump gas, you'll need an intercooler to reach those initial levels you are talking about (at least on a regular basis). Remember, heat is the rotary's enemy, and stuffing a hot intake charge into one will hurt more than help. Regardless, at 15 psi on a car that runs 230 at NA levels (considering your lower compression numbers), the difference between intercooler and no intercooler is going to be a bit more than 15 hp, IMO...

As far as smog legality, more and more municipalities are requiring smog testing similar to California. California is simply the toughest standard in the states, so car companies use it as a guideline for their U.S. setup (regardless of where they might be "marketing" it), 'cause if you can make it there, you can make it anywhere.

The emissions requirements on this engine are going to be as different as the porting setups, and one thing that we do know is that it won't require as much emissions equipment as the previous rotaries to make the required smog levels. So, I don't think that we'll see as big of a gain from removing smog equipment as you once could.

It will be interesting, though, to see how you would have to adjust these new ports to change the "cam profile". Just like other NAs, once you balance the engine, remove restrictions (polishing ports, intake, exhaust, rotating weight, etc.), all you are left with is spinning the thing as fast as you can (meaning running it at higher rpms).

---jps

Output
 

The RX-Evolv only had a 280 ps estimated target power output. The RX-8 is supposed to have 250 ps (247 hp).

Smog equipment? Does that refer to the catayltic converter. The RX-8 should NOT need secondary air injection because it runs lean. You can't just take off the cat. I would hope that the exhaust is very free flow from the factory (dual exhaust or just dual tips)

I would hope to get 250 hp, and if N20 is used when the top end ports open up (6500?) maybe 375 hp is possible,(if you replaced all the incoming air with NOS) and a whole lot of fuel is put inside the RENESIS

ya, i speculated before on another thread (the "turbo?" one i think) that Mazda is building this car with performance in mind, not grocery-getting, so the exhaust system ought to be pretty trick coming from the factory...

also, the 5+6 ports activation range can be seen on the torque graph someone posted earlier (where is it now?? lemme see... yep, looks like your hunch is about right MikeW) illustrates this... and you think you could jam a 125 shot in that sucker?? wow...

A 125 shot is a lot especialy for a rotary. It can be done but its a lot for a stock engine to handle.

N2O is probaly the best major power adder. Other things requred i know (more fuel, higher flow injectors, ect)

That would be alot of fun to put a renesis in a RX-3. 300Hp 2000lbs Whoa!

He was a prophet.

:eek:

How did you find this ancient thread?

This ancient post gave me a chuckle.