Well, the thing is, I want to take my catalyst converter completly off and put on a straight pipe in it's place. I was wondering where I can get the straight pipe from? Anyone know who sells it? What diameter will I need?

And it should just be as easy as bolting off the cat and bolting on the straight pipe in it's place, right?

 

What year is your car?
S4's rely on backpressure from the Cat's to opperate the 5th and 6th ports on non-turbos..


I'd say just buy a header and a midpipe/presilencer.
www.racingbeat.com

 

I went with a header and presilencer set up......... not too loud until you really lay into the throttle........... straight pipe will be super loud

 

Jigsaw, what part of Houston are you in? You really should make it out to a Houston RX Club meet. Alot of your basica questions can be answered there in much more detail. You'll get to see what alot of other folks have done, and how they did it.

-As for your question: I think your car is an S4, but I still haven't seen a Turbo or Non-turbo designation.

 

OK, I just read in anther thread that you have a TII.

If your going to be remeving the cat from your TII, you better invest in a fuel pump, and a re-wire. A fuel pump should be one of the 1st mods to a TII. RETed, has a from mild to wild writeup on his site. If your a noob, follow that. It is informative and could help you in your moddings, although some would disagree with the order of modifications.

You also need to have a goal. I would assume that this is a stock motor.

How far do you want to take it???
How much hp do you want???
How fast do you want to be???
What is the budget???
What is the time frame???

Until your positive on what exactly you want to do, I would hold off on any modifications.

 

Well I have plans for my car. The only major thing I plan to do in the near future is get a large streetport on the motor with a fill rebuild, but that's still going to be a little down the road. My car should be completly done in about 1-2 years, since I'm on minimum wage right now and a college student, could be done quicker if I find a better job.

All I really plan to do is get an exhaust, intake, FMIC, fuel pump, injectors and an ignition system too, so yeah, I plan to do all that and I plan to hit at least 300RWHP, if not more.

But yeah, for now all I'm trying to do is get a straight pipe and I was wondering if I could just buy the straight pipe from somewhere and bolt it on. Where could I buy a straight pipe from and how much, would I need a certain diameter or any certain specs? I'm planning to go with the JIC Bullet Twin 505S SUS System, but that's in about 3-4 months, for now I'm still on stock.

Oh and I have a 1988 Mazda RX-7 10AE T2 completly stock, right now.

 

i have an uncorked system and i dont think its loud one bit. but im inside so i dont know.

 

your mom wants a straight pipe

 

Well here's something a friend suggested:

He said I could just take off the catalyst converter and use a screwdriver or something, and just punch all the **** out of the catalyst converter, so it would just be a clear gutted out pipe, which I can use until I get the full exhaust system with the downpipe.

Is that a good idea?

 

don't just clear the cat of the catacombs
that will make it worse

if u want to do that, u can destroy the cat, but then weld in a pipe to make it a TRUE straight

anyways, if u want to, u can go to www.rx7.com and get a straight pipe from there

but if u want a cat/straight to "make u look like u have a cat" then i think the first option is better

one more thing, the RX-7 cat is a 2 way cat, so it has a pipe going INTO the cat.... that one is hard to get off (i still donno how)

 

Again, if you release the exhaust, your boost will go up. When your boost goes up, you'll need more fuel. But you have an original 18 year old fuel pump in there, that doesn't flow for crap.



The bad side of me says: Release the exhaust, and you'll never forget what blowing a motor sounds like.

The good side says: Figure out where all of you oil leaks are first, fix those, then fix all the other little problems that are associated with an 18 year old TII.

 

I think this was on BoostedRex's Sig:

"Fast and Cheap - not reliable

Cheap and Reliable - not fast

Fast and Reliable - not cheap"

I'd really suggest making your car bulletproof before looking for more power.

Since you're a college student and working min. wage, I think this is in your best interest. I'm in the same boat as you too ::points to under my name::

 

Modiying the exhaust on a turbo is a very touchy subject. It can grenade your engine if it is not done right. OVERBOOSTING CAN HAPPEN VERY EASILY....

 

things like this make me happy im NA...but i still want a turbo

 

It's all about research. There are a few easy things to do BEFORE slappping a 3" downpipe and wide open exhaust on your car...

 

this aint loud at all

 

they sold them on ebay for a while

 

i think it would sound great go for it

 

Yeah it would but would it sound great when the motor overboosts and Grenades itself?

 

So like, what is everything I could do to make sure my car is ready for an exhaust and for me to take my cat out? Like, change the fuel pump, what else?

 

I'm going a full 3'' straight through system on my rx-7, though I have a series 5 and the waste gate can control the boost better, if boost control is a problem you can get the waste gate enlarged or go an external gate, me I want an external gate with a screamer pipe oh yeah, **** the neighbours ha ha ha ha

 

pull your turbo and port the wastegate

 

You make it sound like your paranoia is based on actual experience, but it obviously isn't. His car is stock. Removing the cat will make little if any difference to boost except to restore some lost performance if the cat is clogged (likely). When my car only had a cat-back exhaust, no cat and a pod filter (no fuel mods) it didn't even hit fuel cut. What he wants to do it perfectly safe.

 

What really gets me going is, when someone recently purchases a TII, and the first thing they want to do is make it faster, the cheapest way possible, without attempting to learn from the mistakes of others.

His idea is not a bad one: Open the exhaust up a bit more to make some more power, but that is the same as building a house, with no prints, cheap materials, and a unsure foundation. There has to be some type of plan in place.

There is a minimun number of items on a TII that need to be assured before making more power.

Those who know will tell you, first check for leaking oil: Oil cooler lines, oil pan gasket, OMP lines and o-ring, ect. That is just one system of the car that should be checked. There is still the fuel system, the intake system, the exhaust system, the cooling system, and the wastegate.

I guess the basis of my position is that, in my time, I have seen a number of chaps around my area with TII's, and most have or want some type of open exhaust, first. These guys usually don't last to long, and a few actually end up giving RX-7's a bad name, blaming the car for its problems, when the problems could have been avoided using a little research, or listening to someone that knows.

 

I'm gonna have to agree with both NZConvertible AND bigdv. My personal experience being that i have an '88 Tenth AE TII, with absolutely NOTHING done to the car, except that i literally just took off the cat "Actually, I hit a speed bump too fast, and the **** fell off." I left it that way because it was considerably faster. It does boost a bit more, but I've never hit fuel cut. Now, on the other hand, as we all know, rotaries are ******* touchy and inconsistent. What is happening with my car might not be the case with every other car, or even any other car. So, in that respect, I would also recommend checking for oil leaks. Anything else, IE: fuel pump, wastegate, whatever the **** else they said, I wouldn't bother checking out in depth. A little bit here and there, just to make sure there's fuel flowing and whatnot is okay, but dude, ripping out your turbo and checking the wastegate is just a huge, unnecessary pain in the ***. If there's a problem with any of the other parts stated, you'd know. My car has been running fine since the cat fell off. It's got 140k miles and never been touched, rebuilt, etc. And I don't exactly baby it all too much. The worst problem i have with the car is the trans. Everything else is peachy. But hey, that's just me and my experience. I'm not some FC god, like a lot of people seem to think they are on this forum.