shelleys_man_06

I wonder why no one messes with those threads. Time for Eugene to put his mathematics to work :D. GT3540 away!!

Butthead

Wahhhhhh.... this car's no good......wahhhhh........it's NEVER be able to make real power.......waahhhhhh.........I wanna turbo!!!

You seem to bring this up about every 10 threads and bitch bitch bitch bitch bitch. Jeesh man, get another freakin car. Or STFU and grow some patience.

cretinx

This is just like with the Celica guys . . . .

the Trannys couldn't handle much power, and the high compression meant everyone was afraid to boost. So they just went with looking nice.

In all reality, manufacturers just don't make transmissions like they used to.

shelleys_man_06

Owning a Celica GT-S once, I understand what you mean. What exactly was the torque capacity of the 6-speed transmission? I think by changing the gear ratios a bit (I hear 2nd gear was quite tall, but I owned an automatic so I don't know for sure), it would be easier to handle the extra twisting action. The 13B-MSP has a compression ratio of 10:1; I think this car would be able to handle at least 6 psi of boost. Machining the recesses could lower the CR to allow higher boost, but low-rpm performance will be compromised. The RENESIS cannot afford such a process, since, in stock form (hi-power), it produces a peak 159 ft-lbf at the flywheel. Perhaps an extra gear in the RX-8 would make better use of the powertrain? This car is NOT UN-TUNABLE!

WTF no turbo

I am getting another car. As far as the Waahhhhhh **** gos,I paid 33k for a sports car not a slug.A fragile slug at that.Wait till you see more torque running thru this pos tranny and youll see what i mean.Not only do we have problems with engine mods,tranny needs help to.Im not bitching or whining i like the car.Im just going to accept it for what it is though.A good handleing road car thats somewhat fun to drive.Will never be fast unless you spend 10kplus.

I have purchased another fd and will once again have alot of fun with it.I will say this though knowing the performance potential and seeing the future of aftermarket parts,I probably would not have bought this car.

shelleys_man_06

After reading the threads that zoom44 had set up links for, I realized why the side-exhaust might be unsuitable for forced induction.

From what I have learned about fluids, having not taken it yet :o, air does not like changing direction. A peripheral exhaust port allows air to leave at a faster velocity, compared to a side-exhaust. Why? Conceptually, a peripheral port only allows a working fluid to leave in one direction, giving it one component. However, in a side-exit configuration, the exiting fluid has to leave through the side housing; exhaust gases are forced to change direction, giving the exit velocity two components. The speed, which is the magnitude of the velocity, is constant, but the two components of the velocity are much less. Flow is dependent on velocity, as well as energy. The exiting exhaust gases from the RENESIS will have less kinetic energy than that of a peripheral port. In addition, this decreased energy may affect how big a turbine we could attach to it. But, I think Mazda implemented a much larger exhaust port to make combat this problem.

Mazda chose the side exhaust for emissions purposes. I am sure this has been reiterated over and over, but peripheral ports tend to scavenge some waste, and carry it back for the intake stroke. This idea makes the peripheral port not as environmentally friendly as the side-port. I think the first step is to improve on the N/A exhaust manifold before we can move on to forced induction.

Flame me if I'm wrong!!

cretinx

celica could take 230 lbs of torque before it went kaput.

Fortunately, 270hp turbo cars were putting down 200 lbs of torque.

As for the exhaust manifold, of COURSE we'll need something better. Something sweet and custom and flanged for a big turbo.;

shelleys_man_06

Since we've been talking about boost for a while, something has come up. How does one design a turbo system that will not compromise the S-DAIS in the RX-8? If my assumption is correct, the time at which the valves would open would have to be changed, possibly due to the extra pressure coming in. S-DAIS changes the length of the intake runners by opening and closing valves at a certain engine speed on the rpm-band, I think. I am sure that it wouldn't be compromised in low-boost apps, but would the S-DAIS suffice with a large amount of boost? The concept is perplexing. Also, it's going to be hard to fabricate a turbo exhaust header when current tuners are having a hard time with an N/A, though Knight Sports seems to have a reasonable solution (11 PS with their N/A header).

I didn't know that the Celica's 6-speed transmission could only hold 230 ft-lbf. Are there any companies that will make a bulletproof one for that car? I wonder how much torque the RX-8's transmission can handle?

Butthead

What, you didn't DRIVE this car before you bought it? Or maybe you did, and figured "ah hell, I'll just stick a turbo on it when I get home" Did you really expect a lot of aftermarket parts to be available for a car that hasn't been on the market for even a year yet? Did you check before you bought it? Or did you think this one had the same old 13B as the RX7? If you really can't grow some patience, the you're a lost cause bro. Ypu'd probably have a lot of fun with a Civic cause theres lots of parts out for them.

Omicron

Good questions. I'd suggest you start a new thread about the S-DAIS and FI.

As for the tranny strengthening question, it's been discussed in the past, but nothing was resolved as I recall. Try searching a bit and see what you come up with. Seems to me Judge Ito was going to look into it, too.

ranger4277

Unfortunately Judge Ito was driven off of this forum by naysayers and proof-*****. Or maybe it was the burnout he did that pissed people off.. I forget.
Last I heard (from his own typed response on another forum) he isn't looking into it anymore and has planned to enjoy his 8 stock, as Mazda delivered it. Maybe he'll revisit it sometime in the future.

WTF no turbo

A civic?LOL no thx.I tell you i did expect boost to be at least possible.I really did not research the side porting as much as i should have.I dont dislike the car it works fine for a grocery getter and get to work car.Im a rotary fan and have been for a long time and i guess im just dissappoined.All that said look for my new 7 pics on nopistons.

As far as patience gos 350 had 3 forced induction kits in the first year.Oh btw my car is more then a year old.People have been working on this along time.Some have thrown in the towel.Others that have completed and blew or broke something.Hell i wrecked a tranny already and really didnt do anything to it.I could bomb my 7s tranny at 6k all day.