silverwolf

So ill say this, i am new to rx8club.com, but i did search. I am now trying to pool information for the good of all. I want real answers. Please stick to the thread. If your comment is,"8's cant make power because their not american muscle" then dont post it. It is a time wasting comment. Technical answers are best. Also, if you have found and upgrade that does make good hp then feel freee to post it and how much HP increase you saw. if you could even go as far as to say a mod that doesnt work and why that would be great as well. for example, many rx8 intake kits do not increase hp, why?

saturn

8's cant make power because their not american muscle

Seriously though, you didn't do a very good job searching as you asked some of the most asked questions on the boards. The only mod that shows a substantial increase in hp is FI. And they make lots of horsepower -- 232 in a 1.3L.

silverwolf

bastard....

Red Devil

Why don't you identify what you actually want from your car. Aren't you the one that has asked about drifting a few times in different threads?

dillsrotary

you created a dumb thread to begin with idiot, saturn gave you a polite answer

saturn

Haha, to be fair, at first all I wrote was "8's cant make power because their not american muscle". I mean, he was asking for it!

silverwolf

no i know that saturn its fine. all in good fun. dill its cool man. chill. i only said that to limit the amount of neg posts. i really dont see how its a stupid post. so many people complain that the 8 upgrades dont do anything. i think everyone would like to know why. and for what does work, what is the best. ya saturn i was asking for it.

silverwolf

and ya i asked about drifting.

rotarygod

I think it was sarcasm.

dillsrotary

the renesis being NA is basically maxed from the factory. best improvement would be to delete the whole cat and install a mid-pipe to free up the exhaust flow (show something like a 6 to 8 hp increase.) other than that most small upgrades won't upgrade the factory engineering of the parts (intake, exhaust, etc.)

edit: my apologizes for the first post, i assumed it wrongly

saturn

Asking that question is like asking why a particular piston engine DOES do well with mods -- it's just a characteristic derivative of the way it was designed and built.

In fact, an even better analogy is like saying why more games run on PCs than Macs? More people have PCs so game makers spend money to make games for PCs. Rotaries are much more rare so there isn't as much known about them or offered for them.

rotarygod

As far as what mods give what power levels, standard bolt ons don't do a whole lot. A typical intake might give you about 4-5 hp or so. Removing the cat might give you about 6-7 hp. A cat back exhaust might give you 3-4 hp. None of this is very much. Some systems will hurt power. The original K&N intake system hurt power as did a couple of the others. A lightened flywheel will always free up usable horsepower. Retuning the ecu can give you some nice gains. A conservative retune can give you about 10 more hp but the max seen by anyone so far, and this is with complete disregard for emissions, is about 210 rwhp. The car dynos around 180 or so stock. Some a higher some lower. That's just about the max without doing any internal engine work. Unfortunately we haven't seen anyone do this and get it tuned properly.

Forced induction will take you higher. The Greddy kit is the cheapest but is also very small and doesn't ahve the potential to take you functionally past the 300 rwhp mark when tuned properly. The turbo is just too small. A couple of people have claimed that it flows plenty of air to go higher but strangely enough they can't produce the numbers that verify the claim. They never will either!

Getting up into more expensive territory you'll find the PTP and SSR turbo kits. These kits are based on a manly turbo as opposed to the small child that Greddy sent to do it's job. Mazsport will also shortly have a turbo kit out. So far that kit has seen 350 rwhp but the stock ignition system was preventing it from going any farther. When you get up over 300 rwhp, you really need to start dealing with fuel and ignition upgrades as well.

Speed costs money. How fast do you want to go?

dmp

So is your problem with Air Intakes not making much power, or the Renesis?

Really is a stupid question, however.

Intakes don't 'make' power. Intakes 'never' make ANYTHING. They are bits of plastic and a filter. What they do, however, is allow the engine to intake MORE air, or COOLER air to potentially make more power. However, if the Engine is already using it's air supply in an efficient manner from the factory, there's not much room for improvement.

khtm

why can't you learn how to search?

silverwolf

it was just an example. many people complain about aftermarket intakes so i used it as an example. good post rotarygod. so with a stock 8 tuned without emissions concerns we can get 210? so then if we put on a catback with a midpipe, upgraded ingnition components, maybe a revi intake kit how much do you think we can tune to without worrying about emmisions?

cleoent

mazda did a good job giving us a pretty much maxed out car from the get go. It's a tiny engine, what do you expect?

Reason why american cars can gain so much HP with aftermarket mods is because they come with **** from the factory.

silverwolf

i did search. read my first post. i am trying to get many posts on here so that we can put all of the knowledge we have on why 8s dont make high gains from upgrades. its like the intake intake itake thread. (if you wanna talk about intakes go there) this is like, why no power, why no power, why no power. go here to find why you have no power. i truly think its a good post. instead of everyone on every post yelling about no power gains and asking why they can come here and find out. searching is not the issue. work smarter not harder. POOLED THOUGHTS ARE BETTER.

The Ace

Simple N/A mods in an N/A engine will never do much. This goes for reciprocal and rotary engines alike. Intake mods (PROPER intake mods) will never yield more than 1-2%, exhaust will yield maybe another 2-4%, and cat/precat will also yield another 2-4% (all depending on how restricted the stock parts are).

So, my REVi along with my catback have probably added 5-6HP to my RX8. Hey guess what ? The same mods yielded more than 15WHP in my RX7 TII Why ? Because it was F/I, and the same mods affected differently the engine and its power output.

And since we have no flanges, shafts, valves, rings or gaskets to mess with, I'm afraid all we are left with are I/E/H, and some ECU tinkering....that's about it

Bart!

Not much room for a big turbo, the T618Z doesn't make enough air at high rpms. Besides, our car is what? 2 years old? The RX-7 has been out for much more than that.

Tirminyl

Becareful saying that, there are some engines that are bottled up so bad that you think they were FI once you start modding. Though 90% of the time your statement is correct.

So many people are worried about peak hp just to be a dyno queen or to show off that magic number. I try to focus on usable hp and the "area under the curve".

dmp

Not accurate. 'some' rx8's make 200+whp STOCK on occasion. Your ignition componets are fine for any N/A mods you make.

Do RB Intake + Cold Air duct, Test-pipe, Good catback, and on an R-Flash, with at least 15K miles, I bet you'd see 200whp (Mine hit 197 with those mods, minus the test-pipe). Do the RB ECU Reflash, and Your car may hit 210-215whp.

saturn

What kind of answer do you want? You're asking why the car doesn't get power. What kind of question is that? It doesn't get power because the combustion manifold can't maintain consistent engine compression without blowing the welds on the intake manifold. Are you happy? Now you know, but it still doesn't help you with the fact that you can't do much about it save what we'd already said 40,000 times on this forum.

Seriously, think about what you're asking. We're not going to unravel some huge mystery in this thread that's going to lead to some discovery of a magical device that will get 60hp for $47.

This thread and your question just aren't good.

MadDog

The reason that the aftermarket can't do much for NA is that the Mazda engineers already squeezed as much out as possible. The components that the aftermarket usually targets (intake, exhaust, etc) are already optimized. Hence, there are no improvements to be had with cheap bolt-ons. You can't improve on perfection.

saturn

Sure you can -- add another rotor!

MadDog

nice... I suppose that is one area that they did overlook....