gsracer

my gsr put out maybe 60 foot pounds of torque at 3k rpms, but with an air filter most guys are running low 15's :p

Icemark

Nope. I completely believe it.

Buy it yourself and prove them wrong. I doubt that you'll find much more than a 10% differnce between your numbers and thiers.

Knocking something because you think that it shouldn't be true, rather than actually trying it and finding out weither or not is true is just plain lame.

wpgrexx

yeah i know man, i got a custom set of ss 2" dual exhaust and headers made from Jackson Autosport, a reputable experienced speed shop here in town make mine from the design of mazdatrix. they are awesome, I know what kind of power they yield, but this kid doesn't believe me, or any company for that matter

AbecX

Think about it. 10% difference is going to be 10 - 15 hp. Thats a pretty vauge range to set. I can gurantee no one has ever gained 33+ rwhp, no one has proved me wrong yet. I bet no one can even show me a 15rwhp increase on a N/A rx7 on a stock engine going to a full exhaust setup either.

exquivical

"my gsr put out maybe 60 foot pounds of torque at 3k rpms, but with an air filter most guys are running low 15's"

In prime conditions. I run in Memphis where it was, at the time and most summer times, 100% humidity and 93 degrees out.

Either way, as far as quarter mile times are concerned, the major key numbers you want to be concerned with is 60ft times and trap speed. You can typically make a good estimate of what you SHOULD be running and where you need work.

Is there a section in rx7club.com where people have posted timeslips and mods? If not, that would be a GREAT idea.

I just hate for people to think its there car that is slow when its really them.

AbecX

Your such a moron. You think 2" exhaust tips are going to help? and its HEADER, not HEADERS.

You'd have to be an idiot to not realize the amount of money these companies make by selling 'tards like you these ravish exhaust system that are nothing more then a straight through muffler. Its like all the Fbody dorks going out and buying borla when just add a exhaust cap for $15 that does the same thing 2 weeks later.

wpgrexx

someone please post a dyno sheet. or give my broke *** some money and i will go prove mazdatrix, racing beat, rx7.com all right, as well as the hundred or so people here that say exhausts can give that power. are we all lying to abecx? another conspiracy i think, wheres skully and mulder?

SonicRaT

iTrader: (6)

Where's ReTed when you need him. A less restrictive exhaust on an na WILL yeild more power, that is obvious. If you really want an answer as to why, the engine can flow more of the exhaust creating less backpressure on the engine, thus is obvious, the more you can flow out, the more that will flow in. Think about it, what happens when you have a clogged cat? It restricts your flow so it runs like **** because it has too much back pressure to handle, obviously opening this up is going to yeild an increase. They give percentage because, of course, it all depends on how your engine is running before the upgrade. If your car runs like **** to begin with, new exhaust won't help much, unless the exhaust is plugged. Can you see a 20-30hp increase? Yes. Does it mean everyone will? No. And as you may know, stock exhaust is pretty damn restrictive.

Icemark

No I said maybe a 10% difference between your numbers and theirs.

for example, their NA dynos at 180HP
your NA dynos at 170HP.

Thats a 6% or so difference.

I didn't say a 10% difference between stock and non stock.

If your that caught up with "your right, their wrong" buy it and prove it and stop talking crap until then.

AbecX

Yes, but 28% increase? Maybe on their fucked up car, I doubt they would post up results on a actual tuned up normal rx7. Look on the back of victoria bitrish, they say their Monza long tubes add UP TO 6hp, which sounds about right if you ask me, I mean what could make the difference, tubing material


NO! They said they dynoed 28% more, so can you imagine a 20 - 30rwhp increase on a ******* n/a rx7? Hell I can barely imagine it on a car that NEEDS a ******* exhaust setup. Most cars that are pushing 300rwhp + need a new exhaust setup, but they wont net 28% more power.

wpgrexx

listen, you are so f%^king ignorant, 2" pipes dumbass not tips. sorry i put an s on the end of header, call the cops. are you here just to **** people off, cause you obviously have not researched rx7's. so u know mustangs, good for you, i am not gonna argue with u about what some part does or doesn't do for a mustang, i know what parts have done to my car, people on here know what parts have done to their car, we are saying these things from experience, do you have any experience with putting an exhaust system on your rx7, if not shut up.

AbecX

Why would I but it just to prove them wrong. Hell no one has posted any dyno numbers to prove anything. About the only thing your guranteed to get is different exhaust tone and maybe 10hp out of it ( far from 28% )

wpgrexx

your like the guys who believed the earth was flat, too ignorant to go and find out yourself

AbecX

You have no proof besides word of mouth and seat of pants, whenever you can back it up, post it up, untill then go back and sit in your car that has trouble getting up to highway speeds on the entrance ramp.

Icemark

Pretty common to see at least that with a downpipe, high flow cat and RB or HKS dual cat back.

AbecX

I've been there done that, I know for a fact that exhaust doesnt increase 30rwhp on ANY car unless its a turbo application or some other high horsepower application. Hell, i know some LS1's pushing 360+ to the wheels that gained about 25rwhp going to full true dual and long tube headers. Do you think your weak 140hp engine is so clogged by exhaust flow that it'll gain more then 10rwhp?

AbecX

Those cat backs are worthless, they are straight through designs. Arent the downpipes for turbo'ed cars as well?

SonicRaT

iTrader: (6)

Well, let's get something straight. Rotors are not pistons, can we understand this? You do realize that exhaust restriction is direct to the rotor? So that if your exhaust is restricted it'll push against the rotor as it fires, which in turn kills power. The way the exhaust port is setup, there is no closed state, so the exhaust is always in contact with the rotor, if it's restricted, your rotor has more to fight against as it turns, thus, free it up and it can suck in more air and pour out more exhaust, thus creating more power. Exhaust is more important on a rotary than a piston engine.

AbecX

You'll get no complaints out of me. I already know how the exhaust works on the rotor, and also some of that back pressure helps to pull in new air on the rotors next cycle.

My gripe is more towards someone claiming they got a 28% hp increase on a stock engine without posting dyno sheets or anything. Second of all, I'm just trying to clear up some bs to the people that think they will get 30rwhp from a full exhaust setup on a n/a 2 rotor engine. The imbecility of these claims is on the vornado level.

SonicRaT

iTrader: (6)

If there was a dyno around here I would show you my stock 87NA versus the free flowing exhaust NA, but there isn't a dyno within 200 miles of here. I'm done with this thread, as I have no dyno sheets to disprove you, however I think you underestimate quite a bit. Good luck with your search for a dyno sheet.

dre_2ooo

Well, being as the system costs $1,4xx.xx, I'm sure not too many people are running that set up. And for $1.4k, i'd expect nothing BUT a 28% increase in power!

Icemark

You don't understand much about rotaries do you???

Down pipes can be used for either Turbo or NA cars. RB, Bonze and several other people build them. It is a decent upgrade when you don't want the sound level of a header.

As for the true dual, (which you can not compare a piston motor set up onto in any way shape or form) if you can keep the exhaust pulses apart for as long as possible you will indeed gain a sizable amount of HP.

This is unlike Piston motors where exhaust pulses can be used to help tune an exhaust for increased scavaging.

So your mustang approach of gee only 10 hp for headers on a GM piston motor or what ever you were trying to imply doesn't work at all here. Compare apples to apples, but not rotaries to pistons.

AbecX

$1,400 for an exhaust setup?! BWHAHAHAH

Icemark

I too am done with this tread, for IMO you don't grasp any of this

wpgrexx

5$ for a mustang? hahahahahahahahahahah. shutup already, how many people have to tell you that it is reality that a number like28% is possible, do u live under power lines or eat lead paint chips or something. listen, read ,learn.