seventhgear

who sells the best rue dual setup and or header? i have a pacesetter heAder and want to upgrade to true dual and figured itll give my s4 n/a more hp well thanks ahead of time
jack

RacerXtreme7

iTrader: (2)

Mazda Trix

gr0undz3r0

Get the RB roadrace header and do 2.5 custom piping back from there with some decent muffs. I have Apexi N1 90mm coming back from the RB header. I had to add a cheap set of baffles and get the silncer (removeable) insert to keep the cops off me but it sounds good and flows killer. Ask Hypntyz about it i think he might have pix if I cant find mine.

seventhgear

HOW MUCH IS A whole setup for true dual ?
how abour just the header?

KNONFS

iTrader: (14)

From what I understand they will give you more TQ and less HP in the high RPMs.

adamlewis

....



HP = ( Torque X RPM ) / 5252

You cant gain Torque up top ( or anywhere for that matter ) without subsequently gaining HP

KNONFS

iTrader: (14)

I might be way off, but from what I heard from the ITS guys the true dual will produce more TQ, so based on your comment and formula more HP will be acquired. Is it possible to gain TQ and HP on the low RPMs and loose some on top?

Damn, now I need to find a Dual and normal header dyno sheet!! Anybody knos where I can find this?

adamlewis

Now that IS possible.

seventhgear

well i would love to know how much a true dual header would cost just the header nothing else cuz im tired of my shitty pacesetter well thanks guys
jack

seventhgear

anyone out there ??
guys ? guys?
im lost! "where are you " ?
"where am i "?
n e ways can you guys supply ur .02?
jack

SpeedRacer

$134
http://www.racingbeat.com/FRmazda2.htm

pp13bnos

iTrader: (1)

There are tons of people out there who will say single will out flow a true duel. But i don't agree. If you look at the high hp n/a cars (250+), 9 times out of 10 they have to run duel exaust. Rob at Pineapple Racing has spent countless hours on the dyno working with exaust systems. He has found that for motors that will make less than the 350 zone, they flow best with 2-2" mandral bent exaust. If you plan on shooting a large shot of nitrous through the engine (150hp+)you may want to run dual 2.5" exaust.

In anouther case, my buddy who runs a 13B peripheral port in his Rx-3 threw the engine in his 77 repu, to put some miles on it. (he did'nt have insurance on the Rx-3) He had something like a racing beat header into a 3" exaust, into a super turbo walker. It would run great anywhere below 7k rpms. Once the motor hit the power band, it would just fall on its face. The exaust just would'nt flow well enough.

On my n/a 90, i put down a hair under 170rwhp at 7,500rpms running a custom true duel exaust. I have since played with my s-afc to get a couple more % air flow...so i figure i'm making 170-5ish rwhp. As far as noise goes, its pretty quite, compared to a guy who lives by me with a header, stock main cat, and a n1 dual exaust. I think his name on this forum in noricerx-7. But anyways...i think his car is a little to noise for me, at this point in my life. (However, if you would have asked me a couple years ago, i probably would have thought it ok.)

To sum it up, you're going to have to pay big $$ to go dual, or do it custom. And to be honest, i can't justify the extra $$ for the mazda trix exaust. But if you have a nice welder around, and have some time...i say go for it. Thats what i did. My .02, CJ

seventhgear

THANKS ALOT CJ AND I DO HAVE MY BROTHER WHICH IS CURRENTLY MAKING ME A 2.5" exhaust from the header back all one piece with 2 dynomax mufflers its weird but i like to be different i was gonna go for single 2.5" but i think its a lil too noisy for me but maybe somewhere up the road ill swap a true dual for my exhaust with my brothers 87 with a s5 engine's street ported monster or maybe even his 88ae who knows ill settle with what im getting for now thanks every one but if n e one else has their .02 to give im open for suggestions
jack

Ryde _Or_Die

Mazdatrix sells the true-dual header that is modified to open the 5th & 6th ports correctly.

seventhgear

so if i go tru dual would i buy the rb header or the mazdatrix one for the "6port actuation" if not running the airpump ..do i need an 02 sensor? so in actuality shoul i go the route of mazdatrix roadrace header or rb header ? i need some help guys
thanks.
jack

SpeedRacer

You only have to worry about 6-port actuation and exhaust setups with 86-88 RX-7's.

Ryde _Or_Die

I believe he has an S4.

seventhgear

so i guess going with the mazdatrix one is the better way out hmm? well in the future i know ill go that route but for now ill stick with my shitty header and 2.5" "dual" y pipe exhaust

wpgrexx

dual exhaust is awesome, i have had mine for two years now, the car sounds crazy, different tips and mufflers will adjust the sound for you though. i had a race shop custom build mine, 2 " diameter. with 91+ ocatne, it shoots wicked flames.

easy p-cheesy

True dual looks funny on 1st gens.

seventhgear

haha yea it does look funny .
well doesn e one have the mazda trix tru dual header? good quality? good power? tell me what u think about it.
jack

pp13bnos

iTrader: (1)

I have something realy close like i said in the above post. I'm running a Racing Beat road race header (does'nt collect.) Each pipe then exits into a Racing Beat pre-silencer, then from there goes back into there own Racing Beat mufflers. All pipes are mandral bent and 2". It flows extremely well. We can tell this by the first time i put in on the dyno, it made peak power at 8k. I've seen lots of single exaust 2nd gens make peak power around 6.5-7k...but not 8k. The exaust sounds killer too. CJ

KNONFS

iTrader: (14)

But I thought you had a ported manifold? So you made power all the way to 8K wihtout a ported a manifold, damnnow I need duals if thats the case!

flubyux2

Hey, ive got an S5... so i dont need a header that has provision for 6PI actuation since its run off the Smog pump.. but, the true dual headers that Mazdatrix sells dont have an O2 sensor bung... what am i supposed to do about that???

just guess and pick a tube to weld the bung onto and assume that the engine will run right w/ the O2 sensor only monitoring one rotor???

weld in a X-over pipe between the 2 primaries and weld the bung on the X-over between the 2 pipes??

i dont really want something thats super loud...my supra is already too loud w/ an open Downpipe... oddly, i kinda wanted my RX7 to be the quiet car. Im afraid to use mufflers w/ fiberglass packing due to the tremendous heat the rotary will produce.

I want something that can make good power UNDER 8000 RPM... i dont feel like raising the Redline and want power i can use.

1987RX7guy

iTrader: (3)

www.mazdatrix.com is the ONLY company that I have seen with "True Duals" I own a set and bought them from MT. Total cost with shipping to my house was 1328 USD for the ones with the Racing Beat mufflers.

Santiago