RX8Club.com - RX7 Specialties (rotaryengine.com) CNC exhaust porting

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Quote:

Originally Posted by Duffy78987 (Post 4892321)

so figured id add in,to my previous post. the port job feels significantly quicker,

There is a reason why people that have been around a while are skeptical .
1/History shows that this kind of mod does little
2/History shows that people get all excited and want to justify their choices
3/History shows us that others also get excited and rush in to do the same mod cuz someone said it works
4/History shows that when tested properly on it's own with no other influences that nine times out of ten the mod did nothing in the first place.

So yeah , see what numbers you get as compared to a good stock engine and then and only then tell the world how great it is.

i had my engine built by them last year. bought a new oem engine from them, since they had one in stock, so saved me shipping and time instead of getting one from mazdamotorsport which was backorder. then got the cnc porting for intake and exhaust, rotating assembly balanced, rx7 apex seals mod, oil mod. the build took longer than i wanted, because he had to wait to send the rotors out to cut for rx7 seals in batch to reduce cost.

Quote:

Originally Posted by trackjunkie (Post 4893266)

https://cimg4.ibsrv.net/gimg/www.rx8...483511951.jpeg

I was put on impound Dyno at the track last month and it made 210 whp on a slightly detuned map which got me a DQ, lol. It was a Dynojet

I’m sure the mini clutch helped

not sure how much hp gain you'd see on dyno from mini clutch, since the rpm ramp up is pretty slow on the dyno, unless it was done in 1st gear.

No, that’s just about what I’d have expected the difference to be. You not only reduced mass by over 50%, but also reduced the mass radius substantially for what remains. On a high rpm, low torque engine that matters.

There are some theoretical arguments on the web making your claim, but real dyno tests prove otherwise. The typical street ltw flywheel deal is lighter in mass, but not so much in inertia. What you have is substantially different.
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Quote:

Originally Posted by Duffy78987 (Post 4892321)

so figured id add in,to my previous post. the port job feels significantly quicker, in fact i put buses on a 350z. The 350 driver also told me that there was also a 3 foot flame out the exhaust. so going from a 7 bar engine to a fresh rebuild I'm sure is a definite feel increase coupled with a lightweight flywheel and balanced rotating assembly allowing it to hit 10k rpms doesnt help any. i cant wait to see what it actually hits down to the ground, but so far im extremely happy and would give adam's porting two thumbs up. also with the huge exhaust port when the VDI opens, it SCREAMS. Significantly different rpm sounds along with idle sounds. Everything i was looking for without a bridgeport.

Awesome dude. That’s good to hear these little Renesis can compete with the good old vq engine in a straight. I have done all bolt on mods (bhr midpipe, rb headers and catback and RB ram air duct with k&n panel) have the 1.05 Versa tune flashed. Occasionally get flames. I need to find a tuner or a dyno place before I decide to destroy and rebuild. See what the stock engine can take before i do rebuild and port. In the meantime hopefully we can dyno and compare the results. I know the results would be unscientific and inconsistent based on engine life and care etc., but it will be something to at least look at for shits and giggles.