Just wondering, for the people who have been around longer then me, has there ever been an NA to hit 200 rwhp? Highest ive seen has been 182 from 13bppnos, and 174 from Icemark. Others have looked promising, like Mazdaspeed7, jimi (forgot whole name) and Judge Ito's full bridge 6-port (crashed before dyno, but it beat a t2..), and various other people, but not dynos ever turn up. So whats the official Rx7club verifyed NA rwhp record? (RETed's 3 rotor and the PP's doent count)

 

i swore i saw a 220rwhp last year sometime

 

I thought icemark did some work and got his up to 200? I could be wrong tho

edit: here ya go https://www.rx7club.com/forum/showth...hreadid=260972

close enough, he estemates 200 FWHP

 

I thought racing beat did a n/a with a side draft and got 220 or something.i know there are people in aussi land making 300hp on monster ported (a big bridge port cutting into the water jacket its self) n/as with out n20

 

a pport should get u above 200hp, bridge port could prob get you close with some excellent tuning

 

You might be able to get up to 180-185 RWHP, on a 2 rotor non turbo (non NO2)(non reni) and still have the car streetable, but much past that and the car generally is not something anyone wants to ride with you in, or has other starting & running issues.

Remember a S4 Turbo typically only has about 150 RWHP

 

I am pretty sure with some tuning I could have had 200 rwhp with my motor. It was built by jimmi325i. But its getting boosted now so I will never know.

 

So never a confirmed >200 rwhp dyno?

I just did some digging around, and it looks like Icemark has the highest posted dyno sheet at 174.5 hp, Followed by PP13bnos @ 167 (but on a mustang dyno), then Jimmi325i @166.4, and finally RarestRX with 159 (stock port) Did i miss anyone in there?

 

now are you talking stock ports or are people allowed to port in this thread? I coulda sworn I saw a close to 275 ported motor (pretty sure it was a street port)

 

Streetableish porting,..

 

i am buliding my motor with s5 rotors, street port, turbo II AFM and inj. with a safc, i am trying for 200hp all motor

 

remember those numbers are RW HP, not flywheel

 

that and how many of those people are running a standalone? i was going to do a halfbridge 6port for my rebuild (a friend is doing my rebuild and will port however i want), but after talking with mazdaspeed, he talked me out of it. he got into components that would max out on my S5 (as opposed to Ito's full-bridge 6port S4) and that it wouldn't run right. i took his advice and have decided to do a streetport. i'm not in a position to buy a standalone (financially), so i'll have to hold off on bigger n/a numbers.
high horsepower is possible with carbs, but most people shy from this quickly. powerband and streetability may be sacrificed, but the original thread just mentioned surpassing 200rwhp. i bring this up because of a discussion i had with an engine builder.
as far as standalones, you just dont come across it often. most people who want big numbers go turbo and never bother spending over a grand on an ecu setup for their n/a.

 

True, all of thoose are on stock ECU (+piggy back in some cases), i dont think a stand alone will net 30 HP though, I could be wrong.

 

well, in my case, i'm holding back from doing bridges because i have a stock ecu. i dont believe any of the ones listed are anything more radical than streetports. moreso, i'm curious to how radical of streetports they are. and 30hp is a lot, but didn't RarestRX gain quite a bit with just the s-afc (thats not a retort, thats an honest question)?
so people are achieving ~170 on streetports, imagine adding a few eyebrow cuts (and i know you mentioned streetable; thats debateable, but BDCs car rode fine and 87GTR has a big turbo, half bridge and solid mounts and drives around town). point is, thats a bit more air and its gotta net 30hp. i just wish more people who had the funds and knowhow were curious.
also, these are on stock intake manifolds which is another area i'm very curious of as to restriction.

 

the stock ecu is setup for the stock engine, the more you mod it the more you need to make changes in the map/ecu.

 

Just a small correction here, your most probably talking about the IP Racing guys over here. They're getting upwards of 300hp+ some getting it at 'only' 10,000rpm.

They do not cut into the water jacket. No point, the class rules state very clearly that you cannot modify the rotor _housing_ at all to allow extra air flow.
This therefore completly negates the need to cut into the water jacket, so they don't do it.

They also don't have quite as big ports as you'd might expect...
Lots of secret dark magic in the intake and exhaust design though..

 

dark magic sounds nice, a 300 horse n/a must be nice. lightweight rotors i guess or sumthin...

 

Read this, its very informative http://www.autospeed.com/A_0389/cms/article.html

 

With astonishing portwork (streetable) horse power that i've seen as been in the 210-215 range. We recently built a motor that managed 219 from a very aggressive street port, ported manifolds and S5 internals running an LT-8 unit. 220-235 could be obtainable with a nicely done Bridgeport however longevity, streetability and gas miliage would suffer greatly... basically if you want 235 hp at the TIRE, your not going to want to drive it every day, it's gunna have running and starting issues just like Mark said, and to be quite honest any bridgeport that large is not going to last much over 50k, there's just not enough room from the bridge to the water jacket.

Alittle under 200 at the tire is respectable for any streetported N/A engine.


Regards,
~Markus

 

Got a dyno graph?

 

Trust me, it's been done. Even back when Carburators were popular (they still are widely used by some) However if your that sceptical when i get to the office on Monday morning i'll post a Dyno of the 219rwhp VW dune buggy that we converted into a rotary rocket. I may have a picture of the vehicle, let me see...

Regards,
-Markus

 

This seems to be the only picture i have available of the vehicle right now. Monday when i get to the office i'll post some pictures of this 72 buggy with more engine shots and a dyno graph if my boss still has it on tap.

You'll notice the carb set-up still on the engine, we have isnce upgraded this customers setup back to EFI useing an LT-8 unit. it's really a run ride in this thing that is only 1400 lbs lol

Regards,
-Markus

 

congrats on the 219, Relisys. i have to ask, though, why would that extra 1 to 16 hp sacrifice reliability so much? i would think a small halfbridge would add enough extra opening without sacrificing engine life. at least not by 50K+ miles.
how'd that rotary dune buggy hold up? i would love a sandrail street setup using a rotary, but i hear a stockport 6port is pushing the limits (powerwise) of the vx box. i dont know how true that claim is, but i wouldnt be surprised since the original vw engines had about, what, 80hp?

 

To be honest after dyno day and tuning of the LT-8 unit the customer was able to get a good 500 miles or so before the stock transaxle took a crap. The unit is currently at "Rancho" in California getting rebuilt with harder gears, beefy syncros and an close ratio 2-3rd gears.

Mainly what kills engine reliability on a bridge port so much is that there is not alot of material left once the port has been finished... There's literatly 1-2 mm of room between the port inlet and the waterjacket seal. As compared to an aggressive street port you still have several (nearly 10mm) of material depending on port configuration to work with.

Also, there's the chance of a side seal simply falling into the bridged port. Normally on a "proper" bridge port the rotor housings are also die-grinded to allow better flow of air coming in from the "bridged provision"

Granted i've seen BP run nearly 100k miles, however when we build a BP for a customer we build them for speed, largest BP possible, as close to the water jacket as possible, and hardened internals to accept high revs which is where a BP is going to make the most power (above 8500 for sure)... All leading to en engine that is MEANT to be beaten on, which in turn means it's more likely not to last as long as a stand streetport or stock ported engine.

The VW is a blast to drive, our Turbo Rotary Miata's are even more fun!
... Yes we produce an install kit (Rotary/Miata conversion)

Regards,
-Markus