shaunv74

Nice graph. Do you still have the CZ or did you step up to the int-x?

305WANKEL

I Would Disagree With Everybody Who Says Intake/exhaust Doesnt Work, I Have A K&n Intake- Re-amemiya Headers- Gutted Stock Cat-greddy Sp2-and A 60 Shot Of Juice, And U Can Ask All The Turbo 8's In South Florida What Has Happened To Them With Me. I Keep Up With Stock Sti's And Evos And I Think Thats Good Comparing Their Numbers And Engine Setups .


Besides, The Car Sounds Like A Porsche, Not Too Loud But Deep- Thats Something Worth Any $$$$

shaunv74

Yes well the 60-shot of Nitrous probably has something to do with that. Not exactly apples to apples comparison. I'm sure you are reaping improvements from your exhaust over stock when using your nitrous.

I do agree that nitrous itself is a very affordable way to increase power but I would say your other mods support the performance of your nitrous as the primary power adder. I don't know if the OP is interested in nitrous or not.

Fanman

The main restriction point is the cat & resonator. There have been dynos run by people on this board that showed a good 6-8 hp of that 10 hp gain is from the cat & resonaotor removal. The cat back exhaust gains a few hp probably by a smoother/straighter design, even if using the same 2.5" piping. Intake, pulley, hi-flow cat, cat back exhaust, ECU re-flash will still only net you about 20 hp TOTAL (not more).


Because a big bulk of them are liars. NOBODY has shown these kind've hp gains from their exhausts on independent dynoes. Most showed as some vendors have said about a 2-3 hp gain. Period. They have financial interests in selling you things. And they think they will sell you a lot more if they claim 20 hp for $600 vs. 2 hp for $600. And some ricers will believe them.

Daemos

Chickenwafer: I'm not going to go hardcore NA, just the basics, no porting, while I save up for $$$ or see if there is any FI application I'd want to go with. Where can I find more info on this Mazdaspeed V2? I've honestly never seen a car that is so inconsistent on a dyno, but it's good to know, so I can keep an open mind

*edit* The V2 is the dual canister one? I perfer the V1 with the huge single muffler. Not sure if there are any gains with that one over the v2.

shaunv74: Where is the true exhaust restriction? I assume if 2 members know, then why haven't I found it? The only answers I find are not consistent with each other. Being new here, it makes it hard to tell who is really knowledgeable, and who is not. And yes cooling is a major thing needed if you go FI, I will deal with that before I go FI, but it also depends on the FI application, certain applications should make less heat than others.

Fanman: Why are people saying different things gah. Makes it hard to get information off this forum by searching, as you need to quadruple check any info.

pdxhak

iTrader: (2)

Yep. Now we just need a sticky thread just for proven NA mods

Nemesis8

iTrader: (3)

Sold the CZ and waiting on Cobb like allot of us are.

mysql101

My car runs cooler than a stock RX-8 does.


It doesn't cut off at 7000. And you only make more horse power when you go into boost. Otherwise it's exactly like stock.

mysql101

I can show you a composite dyno chart with about 8 pulls on it, the tune was being tweaked, but the numbers were exactly the same besides the AFR/timing changes. Maybe some of you guys are using crappy dyno machines

Trekk

I find it funny how all these people seem to think the cat isn't a worth while upgrade.

N/a mods work, but you are not going to find your self glued to a seat because you let more air in and out of the motor. Most are peak upgrades so they wont offer much of anything till you really rev'd up.

Atilla

iTrader: (1)

What i would like to know is the difference (in regards to power) in having a highflow cat versus having the cat removed completely.

i was thinking about going with RP supercat but if removing the cat gives a more noticable increase over the supercat then i might do with that...any advice for a 8 that's a DD?

shaunv74

Most folks that have removed the cat have noticed it's much louder than stock and have had to install a resonator to make it livable as a daily driver. I don't have experience with the difference in power between a resonated mid pipe and a high flow cat. I'm sure there's a few threads out there on this that can be found with some searching.

Trekk

I can tell you based off my civic. I was doing the sleeper thing so I had a 2.5inch catless pipe that ran to a dynomax super turbo muffler. It was still pretty loud so I added a res and it about cut the sound in 1/2 and the car sounded pretty close to stock again, just a little more *****.

Point is that a Res will cut the sound down a pretty good bit.

chickenwafer

iTrader: (9)

Well, my car on a Mustang dyno made some pretty floopy numbers. and so did a few of the other RX-8's there. But then again, one made consistent numbers ranging from 166-170.

I've also seen a lot of others have the same floopy numbers, and others have not. Like I said; it's funky

mysql101

mine was on a dynojet btw.

shaunv74

My experience on a dyno was pretty consistent. Also on a dynojet.

Detrich

correct me if i'm wrong, but the add'l (nominal) hp gains from the mods he mentioned also come at a price of lower MPG...

shaunv74

My Racing Beat flywheel did not lower my MPG. Anyone have info. on intake and exhaust/cat removal impact?

In the interest of true transparancy my MPG shortly after installation did suffer but only due to the fact that I just couldn't keep my right foot under control after I installed it.

stuartm

[QUOTE=Daemos;2002280]
shaunv74: Where is the true exhaust restriction? I assume if 2 members know, then why haven't I found it? QUOTE]

Maybe you need to look between the rotors & the manifold

shaunv74

I guess I"m being cryptic. The turn from the side exhaust ports out to the exhaust manifold is an abrupt 90 degree turn with no fillet so it causes some turbulent flow and backpressure. Rotarygod and Charles have been trying to smooth these out in his engine rebuild. You can check it out in Charles R. Hill's "Rebuilding my Renesis" thread.

rotorocks

Power always comes at a price of MPG
To get more you burn more fuel. You increase the airflow (intake, exhaust... Whatever) you get more air in, which PCM compensates for with more fuel.

Unless you don't change anything, and just lean out what you already have.
Look at how ritch that AF curve is on the Dyno printout. (I run 11AF at red line under full boost, and they have it in NA.) But that just releases what power potential that fuel has in it already. To get any more, you need to add more.

rotorocks

Intake don't do anything worth even mentioning. I don't care if you put a god damn platinum compound 10" wide intake from the future with a with Richard Gear's gerbil in it. It won't make any more than 1or 2 HP power.

Neither will Exhaust, on it's own.
5HP that you can possibly gain with removing cat don't count.

Good for you. i hope it looks nice an shiny.

I am in South FL.

You outrun a poorly tuned rx8 with greddy and emanage blue driven by a teenager? Congratulations.
I've had nitrous on my car before. I run 75 HP. It doesn't even come close to a properly tuned turbo with 8-9PSI of boost, so stop right there...

Comparing what numbers?
Where would you be with your "Upgrades" without the nitrous shot?

By the way, mine turboed 8 doesn't keep up with them. It blows them right out of the water, along with anything else out there that is in the power range of under around 350hp (Which I am sure
that any decently tuned turboed RX8 could do, just ask Mysql, or MazdaManiac, or MadDog...). But that's besides the point.

Sure thing. It sounds nice. but so it would if you had stock intake with VFAD taken off.

Dude, get real.
I bet the first thing you thought after you put all those mods on was - "FUC*, just got screwed!!! Just threw away a shitload of my money for nothing!" And then you experience a mental shut down and went into the state of denial.
And now you sit here and advertise that useless crap to others, because in your mind it's like this: "I got screwed on this, so now it's their turn."

Trekk

Dam rotor kind of harsh. Seems most turbo kits cost at least 5k tunned, some going way past that. That 5k could get smoked by some bolt-on's and a bottle pretty easy.
I mean a pretty much stock greddy from what i've seen puts you at around 230ish WHP, and you have n/a guys that are landing right on the 200whp mark(and almost none have a header). Yeah you could always boost more to get hp, or build you own kit!! but most of the people on this forum find putting an intake on a challenge.

SE3PSynergy

problem is, he wasn't attacking anyone yet you come off entirely too condescending and attacking towards him- (not to say you aren't right for the most part.) Honestly, there are a ton of people who know a shitload more than you and I and 90% of the rest of the forum combined but don't go out of their way to be dicks about it.

With his EVO/STi statement, I've hung right with stock evo's around highway speeds on several differrent occassions with only the K&N V2 and AP pulley. Not to say those mods gave me 20 billion horsepower or 0 horsepower but just getting the point across that I'm thinking he meant without his nitrous. The only way he would be needing nitrous in that case would be if he was rockin an AT RX8...

shaunv74

So if we're all done measuring our dicks can we get back to giving this guy the information he was looking for.