ypwpat

This is the list of the car:

Fujita engineering RX8 (Feed) 250ps/1310kg
Power: 5.24kg/ps
Altezza (TRD Democar) 220ps/1360kg
Power: 6.47kg/ps
phase Accord Euro R 228ps/1380kg
power: 6.31kg/ps
K Office Z33 300ps/1440kg
power: 5.14kg/ps

Best time and winner
1st: RX8 1min10sec445 (lap5)
2nd:K office Z33 1min10sec166 (lap5)
3rd: Accord Euro R 1min11sec505 (lap2)
4th: Altezza 1min14sec619 (lap2)

Jt-Imports

Are MODS deleting posts here too?

MrWigggles

Because you are representative for a company, you have to be careful what you say.

You can answer questions about one of your products but you have to be careful not to delibrerately advertise market your product.

I don't know why your post was deleted. I'm just trying to answer your question.

-Mr. Wigggles

Jt-Imports

Yeah I hear you man, thanks.

I just said I will talk to FEED and RE-Amemiya to see what they are up to in more depth.

Oh well..

sixspeed

I got this DVD as well. I will try and pull some of the footage off tonight and host it on some webspace. for a few days...


-andy-

Sputnik

If we delete a post or thread because of content, advertising, etc., we will be sending a PM telling you why, and explaining the rules (or a warning if the situation calls for it).

There have been some problems lately where some posts get dropped in the past couple of days. It's happened to me too. So if you haven't gotten a PM from Elara or Toadman or myself about it, the site dropped it.

---jps

Jt-Imports

cool, fair enough..

rxevolve10

nihongo ga wakarimasen

RX-Nut

TRANSLATE!

rotarygod

It doesn't look like they cut peripeheral exhaust ports in the Renesis housings. It looks like they are using some older 13B housings. The give away is the fact that the rotor housing he is holding only has 1 oil metering jet in it instead of the 2 that are in the Renesis housings.

wakeech

...that would be rediculous anyways: you wouldn't get nearly any exhaust gas velocity coming out of the engine with about double the volume to fill with those extra two runners.

i think, still, the best solution would be to modify the intermediate housing and run a (rather funky) 4-to-1 header... get rid of that strange siamesing.

Wakka

Hello, my first post in this forum.

That rotor housing is from 13B used in Luce. Luce was a luxury sedan sold in Japan. A.K.A. 929 in U.S.

RENESIS has corner seals on Rotor housing, making it difficult to use housings from FC and FD. Fujita-Eng used rotor housing from old 13b used for Luce, which had corner seals on Rotor Housing.

At least that's what the article said.

BTW, I can read and write Japanese. I should, since I'm from there.

This forum is awesome! I'm planning on buying RX-8 soon. Already had 2 test drives!
As an ex-owner of '91 FC turbo, I am so happy to be able to buy a brand new Rotary from Mazda.

rotarygod

You mean water seals not corner seals on the rotor housings.

Wakeech you're a technical guy and may be interested in this. At the very least I'd like your feedback. There are a couple of ways to do a proper exhaust. I agree that a completely seperate center pair of ports would be best but there is another way to simulate this. It is a design that used to be used on old 4 cylinder engines that would siamese the runners of the center 2 cylinders. I can only speculate that it will or will not work but will try it when I get my car. The 2 outer ports would have their runner collect together at a point that is as of yet unspecified in length. The center runner would collect later downstream at a distance 3 times that of the first collector distance. Immediately after the port exit on the center runner we branch off to a dummy leg of equal length to the outer ports. This pipe just deadends to nowhere. the end is blocked. This may be a little hard to visualize. The dead length pipe resonates at the same frequency as the outer runners but affects the third longer length in that all pulses will be of equal intensity and frequency at the final collection point which would appear to the engine as having 4 equal length pipes. You really need to pull out the old books to see a good example of one but the priniciple seems very sound according to all of my technical sources. It would be a fun experiment never the less and doesn't require pulling out the engine to make the mods.

wakeech

yeah, you mentioned the "3 times the length" before... so two collector points, and one helluva HUGE header... hmmmmm... it'd be heavier, large, but yeah, probably the best way to deal with the intermediate port for your average road using peformance enthusiast.
the trickiest bit will to find a way to get all of the length of the central runner to FIT inside the engine bay (and still have it collect with the others before the cat)... probably will have to go F1 "mess of spaghetti" style... it'll look great though. the capped runner is brilliant (F20C stock manifold uses this device, i believe), but every know-it-all rice tuner will break out the word "flow" and ignorance will ensue. *rolleyes*

extremely cool info rotarygod... think that your manifold design would bring the torque peak somewhere around 8500 - 9000 rpm with a little bit of a redline bump on the engine??

"how high can you go?"

rotarygod

Cool I guess you understood what I was taliking about. I knew you would!

The peak power point is going to be determined (obviously) by the collector points distance wise from the engine. Since I haven't built one yet and haven't dynoed one, I can't say if it will be feasible in the length available before the cat. I don't think it will be that hard to fit in never the less since the dead pipe can go anywhere it can fit. I don't want the 3 pipes to collect at the same spot. I want the center one to run parallel to the other already collected point until it gets to the proper distance. The first one I try will just collect this pipe immediately before the cat and have the others collect at a point 1/3 the distance just to see if there is promise. I'll worry about tuning it after the initial testing is done. I'll probably find a way to make the first one adjustable with inserts until I find the right length. I may even experiment eith moving the cat slightly back although the decreased amount of heat may really mess things up. If I don't move it more than about a foot then there shouldn't be much problem. Only time will tell. Maybe this won't work at all.

j9fd3s

2 things.

1. that looks like a gsl-se rotor housing to me

2. the rx8 header, you could do something like a tri y setup

mike

rotarygod

Damn Mike you're everywhere!

The header design I'm talking about is more or less a Tri-Y setup that also adds a dead leg to the center, longer pipe.

I know Paul Yaw is on this forum. I'd love to hear his opinion. If he says it will or won't work, I'll believe him.

wakeech

oh, i was just nudging at you to do some very rough math, see how long this long-*** header will be in the end... and the additional benefit of a high power, high rpm torque motor: the header is smaller

yeah, but just thinking to myself how long that might be (maybe 35 - 40") i'm just uneasy about the amount of room... with a loop-the-loop (yeah, i mean in a radius-as-large-as-possible way) you could me sure to get all of the pipe in there, and collected, before the cat... but yeah, haha... we don't know yet!!

i doubt that once the engine and cat are all warmed up that there will be much of an appreciable difference in the sustained temp in the cat if you move it back an inch or two (you'll just have the EPA or whatever on your ***...). startup would be affected, but normal running would probably be fine.

...glad to see you agree.

wakeech

PM yawpower and ask him. i know he wouldn't mind. (FWIW, he's using the STOCK log in the race car, as of yet).

rotarygod

PM'd him and he replied. Good ol' reliable Paul! He said that the Renesis seems insensitive to exhaust tuning so far. That's dissappointing. I had always suspected that it would be 'less sensitive' than the peripheral layout but never thought I'd hear the word, 'insensitive'. Hmmm... Kind of makes you wonder?...

wakeech

holy christ... hmmmmmmmmmmmmmmmmmmmmmmmmm... ("kind of" is an enormous understatement)... jeez, i wish we could see data of what the real pulse pressures and overlaps are...

also of note: Paul hasn't changed the porting of the engine at all (he can't), which is where any serious tuner will pick up the most ponies for sure (yes, even the turbo guys have to port well to optimize), and which will influence the pulse patterns and possibly the "sensitivity" to tuning.

crazydrifter

i dont know really anything about rotory motors but i was woundreing is the reason the housing they used have only one oil port instead of two because with one oil port there is a factional less amount of oil in the motor so more fuel and air can be added....even though its a fraction amount just 10hp on a car wieghing in at about 3000lbs would be like a 20hp to a 3600lbs...not exactly 20hp but just rounding up

rotarygod

The current housings have 2 oil injectors per rotor strategically placed to help more evenly lubricate all of the engines seals. The older rotary engines (pre-93) used to have 1 in the center on the rotor housing and another one on the lower intake manifold where it could mix with gas before entering the combustion chamber. The 3rd gen RX-7 only had 1 per rotor because Mazda claimed that the surface cotaing on the rotor housings was slippery enough that less oil could be used. Obviously they have changed their minds. It wasn't because of power though.

Jt-Imports

You guys know about the headers RE-Amemiya are about to release?

JT

rotarygod

So far testing has shown that new exhaust headers aren't doing anything.