GLHS

Is it true you can extract more power from a true duel pipe free flow setup, VS a free flow single?


I am thinking of two pipes out the passenger side. **** mufflers!

emagdnim

True dual no mufflers will flow more than single exhaust collected without mufflers. I wouldn't doubt it if you lost torque due to loss of backpressure.

GLHS

Lose torque? More flow.

Are you talking about rotaries? I don't think they need any back pressure.


Torque = HP. Flow = Torque.

Phu5ion

i think it should increase power over the entire curve but if you are using backpressure to activate the aux. port actuators they won't open if you are using a straightpipe. You can use an rpm switch and tap into the out coming air from the airpump if you are using it. or get somthing like a presilencer which has the line to create backpressure.

GLHS

How much of a HP gain over single setup.


I am not worried about the ports working, this a full race app, I am trying to get an idea about.


I wanted to know how much more power would I get for a second pipe, maybe 10 if I was lucky?

HALO

Like someone pointed out on a thread a few days ago. The Mazdatrix race exhaust two pipes all the way back from the header (they don't Y together and then back out to the dual) is claimed to make 28% more horse power over stock. That is a lot of juice from just exhaust. My math isn't real good but you figure around 35 more horses to the pavement if your rex puts down, say 140 to the ground.

I am considering this after I get my ReX running. If I have the cash flow. Just over 1200 dollars is probally more than I can afford.

Halo

Phu5ion

yeah i read that thread too and it got me to thinking you might just see that kind of power increase when you take into account how old the old exhaust is, how clogged the cats are, etc. taking that into consideration then i could say, yeah you could see that kind of power increase. we rarely test new stock versus new aftermarket products. same with the pineapple 6-port sleeves, just taking the whole intake apart and cleaning it is helping make the system run smoother already and adding horsepower. not just the simple act of replacing the sleeves.

so as to the case of the Mazdatrix racing exhaust get it if you want it.

will you see a power increase? yes
will it be 35 rwhp? maybe, depending on the condition of the exhaust you are replacing.

DShot

I will tell you exactly what is gained from changing good clean 2K miles old stock exhaust with a true dual setup....even give you the difference in the good "old" stock and a good no cat collected dual setup.....i expect it to look something like this...........15 extra hp "catless", and 25-30 hp true dual....

This is a 88 GTU, 2K on engine.....

- D

poor college student

are true duals louder than like say, a header/presilencer w/ a y-pipe? if so, is it a lot? or just a little?

HALO

Mazdatrix has a sound bite. And it is pretty loud. But no louder that these honda's scooting around on the roads. There system runs dual pre-silencers.

I dont know if I could afford that any way. I am getting a loan to get mine running. I think I am gonna pay for another year just to get an exhaust system. But if I had the cash, I would diffently go for it.

Halo

marlaman

****. i typed like 2 pages of info and **** and now it's gone. ANYWAY

I have the true dual from mazdatrix and I noticed the gains in power-even on a blown engine. It is quiet compared to those gay fart cans and whatnot that rice boys have. It's an awesome low baritone buzz in the low rpm's and sounds cool as **** in the higher. granted i'm backfiring like a madman because i run extra rich when i drive my beast to even get it to idle but that's not the point. Note-the true dual setup is made of stainless stell the entire way through and it weighs about 120 lbs. well worth the power gain though IMO.

I heard from rob at pineapple when you get this exhaust and his sleeves on a fresh engine you can expect about 180hp figures to the wheels. and porting even adds more to that total. nitice my sig :-) i'm gonna be a happy boy.

Anyway i hope this answers some questions.

Flyby116

Marlaman how much was the exhaust shipped?

Im deff going to get it this sept when I get my car back.

Looks great!

Nick

marlaman

well it was roughly 1325 shipped to MN. No idea what it'd cost anywhere else or what. they shipped ups and the boxes were torn to **** but they packed it good enoguh nothing got bent or even scratched. kudos to their packing job.

haha the pipes come loaded with peanuts so don't empty them out b4 you start her up for the 1st time and you get a bunch of firey crap come out of the tailpipes. it's pretty cool. not really smart but i was being a crackhead at the time.

Flyby116

HAHAH Must have been cool to see lol

Yea I cant wait to get it all

Thanks man

Nick

marlaman

no problem. are you planning on installing it yourself?

KNONFS

iTrader: (14)

There is a forum member with a mildly street porte engine (by Rob), Pineapple sleeves, duals, SAFC, ported manifolds etc, putting down near 170hp at the wheels.........

180hp, is very arguable

marlaman

sorry didn't mean to bite anybody's *** or anything but rob told me this. that's all buddy. maybe he meant to hit 7 instead of the 8 but it's in the e-mail i got from him

JKBe30m3

I've also got the Mazdatrix true duals which cost me $1380 shipped to my door. It sounds awesome and it does make quite a noticable increase in power. I can really take my engine to very high rpms until I get a new clutch-it started to slip after I put my exhaust on. I don't know if there is a 28% gain but it sounds pretty badass at WOT

rotarygod

iTrader: (1)

I used to have a true dual setup on my 2nd gen back before it was a turbo. There was a great increase in power over the whole rpm range. I personally didn't like the sound. Didn't sound like a rotary to me anymore. Gas mileage went up too.

The dual is the best setup for a stock non-ported rotary since port overlap is very small. Once you do any porting you need to keep it collected. The scvenging effect of a collected system is more important with the greater amount of overlap. I have a streetported GSL-SE also and was toying with the dual setup. Made it fit but power went down from my long primary system. A friend of mine who has a big bridgeport noticed the same thing when he went dual. Power was lost. I personally like the long primary if the engine is ported. If not go ahead and dual it.

Dual will be louder over a collected system. At least mine was. By collecting it the tone is muffled a little due to the interaction between the two ports.

Evil Aviator

No, not on anything that makes a lot of power. Look at the pictures of IMSA cars with rotary engines (Kudzu, 787, etc.) and tell me how many you can find with dual exhaust.

Then plan on getting lots of tickets. The sound of a non-turbo 13B with open exhaust: "Hello all cops within 10 miles - come get me - it's easy - just follow the noise!".

Long primary collected system on my 1Gen, too.