The Interceptor-X for N/A Cars
#702
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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.
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.
#704
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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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Last edited by Renesis_8; 09-11-2011 at 08:17 AM.
#705
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Is that car you dynoed going to run in GS class this weekend at VIR?
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Last edited by Renesis_8; 09-11-2011 at 08:17 AM.
#706
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?
HEY, I can dream right?
#707
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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...
For some reason, I think I've posed this thought on the forum before, but can't remember...
#710
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Originally Posted by Red Devil
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...
For some reason, I think I've posed this thought on the forum before, but can't remember...
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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Last edited by Renesis_8; 09-11-2011 at 08:17 AM.
#711
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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.
#713
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Originally Posted by Richard Paul
So then all the cheap bastards have to do is put a core in there for a nice exhaust?
Originally Posted by Richard Paul
There must not be alot to gain there or they would have done it.
#714
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Originally Posted by rotarygod
Yeah pretty much.
Don't give them too much credit!
Don't give them too much credit!
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Last edited by Renesis_8; 09-11-2011 at 08:17 AM.
#717
Go Texas Longhorns!
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)
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)
#718
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Torque
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
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Originally Posted by rotarygod
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.
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
#720
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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.
#721
Go Texas Longhorns!
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/
#722
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Originally Posted by brillo
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/
#724
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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.