krackerx7

iTrader: (1)

whats the most power or the fastest quater mile or top end that anyone has ever gottin out of a N/A rx7 or any other rotary powerd vehicle?

buzz

all motor, no bottle;
324 or 330 hp at the flywheel for a 13b bp - not cutting into the waterjackets (as per a particular australian racing category rules). This is using trick quad throttle bodies on a funky custom manifold and motec ecu revving to around 10,000. These weren't overly "optimistic" dyno's either.

There was a 13b pp rx7 1st gen (white, and blue) running about 11.4 over the qtr... was in a mag like Turbo or something.

Here in Australia, years back a rx3 coupe 13b bp ran 11.7, more recently a chassied honda s600 13b pp does 10.4, for a while there has been an rx3 20b pp did about 10.8 (I think). Both rx3's are "street".

repuguru

Hey BUZZ. Have you seen any NA 20b's running around there? What kind of power did they have?

buzz

well that rx3 I quoted with 20b pp was obviously pretty good for a 10.8, i dont recall the article quoting a rwhp figure.

Selectmaz (look 'em up on the net) build motec'ed 20b pp's for sport sedan circuit racing, and claimed 450 or 500hp - and that would have been a repeatable, all day, every day, kind of figure.

repuguru

Wow, I'd just be satisfied with 300hp to the rear wheels of my truck.

buzz

darn, web ate my last reply.

the 20b pp was a 500hp @tfw - but this class runs a fairly low rotating mass drive line, so the rear wheel hp from one of their chassis would be quite high, more than a normal street type sedan....

the 20b pp is cost effective despite the higher initial purchase price. there is no manifolding, IC, turbo and development costs. Plus, when there is less to let go in an NA engine than a turbo, and turboed engine failures can get very expensive (especially when little bits get shared around the inlet tract) - where as a NA failure would normally be seals or housing leaving at least some bits re-usable.

Power wise, the 20b pp is on a par with the 13bt because many racing classes mandate the use of restrictor plates to make them racing more competitive (read: make v8 chev engines not look bad...).


Oh, in my first post when I mentioned 320+ hp from a 13b bp, the very same engine that pulled 324 made in the 280's or 290's with a 51ida. So there was less than 10% power increase for a large cash outlay, but it will be the difference between being at the sharp end of a racing grid and being in the crowd.

DoriZaru

A 1st Gen. -7 just ran a 10.30-something, all motor, at one of the NHRA Import events... 13B PP. Not bad at all, plus he's sticking it to all the N/A Hondas, which sweetens the deal.

Anthony Rodrigues

Kilo Racing from Orlando Florida is the only NA running those numbers in NHRA and he has a 20b. The best I have tuned in Aus, I believe to be toughest NA in the country 20B=388rwh(Ivan Mikac) 13B=294rwh @ 11,600rpm(Rohan Ambrose). Both these cars use extremely low drag, circuit racing gearboxes, but also readily back up their numbers at the track. The NA Honda is also one of mine and could only manage 256rwhp @10,200rpm. NA are mostly used for circuit racing in Aus and are required to run flat out for up to 100km at a time. We have spent years developing and tuning these engines. Twister who uses this forum has one of the toughest BP that we also tune and can vouch for the numbers and the results. I would be interested to know what type of Rwhp the Judge has because that is one fast Mother and he has been around. Even without his helper.
Regards- Anthony

buzz

Anthony - is Ivan's engine a straight 20b or is it a 13g or use 13g type parts. I just heard rumours about a previously engine builder and the bits he apparently had lying around...
If it's a 20b, is he using the stock shaft and could you tell us what kind of RPM he's seeing that power at?

Anthony Rodrigues

Buzz,
Ivans engine is a highly modified 20B and has no 13G or factory race parts with the exception of Seals and dry sump system. The crank is a factory unit. There are many other internal mods that have been carried ou within this engine to live at its 9300rpm shift point.
Regards Anthony

buzz

Thanks for that Anthony.
I hope to have a look at it if he goes to Wakefield in the near future. I saw/heard the 13b pp version at the washed out 4 & Rotary Nats in Canberra a few years back... very nice indeed... I also remember a certain orange rx3 - pity the head to head runs with Pac didn't eventuate.

Seedorf_20

Thres a 26b pp quad rotor in New Zealand that has an ET of 10.21.

steve84GS TII

Lets not forget the 787B....he did say ANY rotary powered vehicle!

Built way back nearly 20 years ago,it made 700+ HP from an N/A 26B 4 rotor.
Power was estimated to reach over 900HP if the redline was allowed to reach 10,500.It was restrained to 9000 RPM (700HP) for racing longevity.

DELTA_Rotary

Wow back from the dead. Padilla was/is running 9s with his 1st Gen NA.