RX-7racer

ok, thanks, you have been really helpful

camogreenfc3s

dont remove not much of a power gain plus like mention your 5th and 6th ports are actuated with the exhaust back pressure

RX-7racer

yeah i decided against it, but what about just removing the cat?

Justen

You could just remove the cats if you wanted to. It would decrease back-pressure a little and give you more top-end power.

However, usually the rule of thumb is: whatever you you gain in high-rpm-horsepower, you'll probably lose in low-rpm-torque.

Its always a trade of for the most part... sacrificing driveability for peak HP, especially if you're gonna start doing more serious performance mods.



On an n/a, removing the cats could result in a pretty loud exhaust sound as well, so keep that in mind as well. It depends on the rest of you're exhaust system.

I have a Bonez main cat delete on my s5 Turbo2 streetport with a Racing Beat catback. It didn't make to much of a difference in sound but only because the turbo baffles the exhaust a bit. On an N/A motor it would probably be louder.



Here's a decent thread about it and some other mods. Best thing to do is read up on other people's threads for more info and opinions.

Good N/A performance mods

Baldy

You'll do better buy replacing the stock exhaust with something like Racing Beat exhaust. Removing the cat won't do a whole lot, unless your current cat is clogged.

RX-7racer

right now im just looking for inexpensive ways to increase hp til i can afford to do an exhaust, and eventully do a t2 swap

Baldy

Just wait till you can afford a decent exhaust.



You can always piece it together to save money. Look for a used RB header, and pick a presilencer and muffler from the many brands available (packed with stainless steel, not fiberglass). Have a shop weld pipe/flanges in. I did that, much cheaper than a full RB system, sounded and flowed nicely. It just wasn't pretty, but who cares?

RX-7racer

what about instead of getting a full exhaust just going to a single turbo or stock turbo? can the n/a support a turbo?

Baldy

That's a big topic, with many discussions, feel free to search for more info. But the general consensus is, it's much easier to replace the n/a drivetrain with the TII drivetrain (engine, tranny, driveshaft, differential, halfshafts). It is possible to turbo an n/a, and people have done it, but it'll cost much more than simply installing an exhaust on your n/a. You would need, at the very least (and I've never done this before) a turbo, the exhaust manifold, intake manifold (custom/modified to fit n/a engine), intercooler, exhaust, upgraded fuel system, ECU, and exhaust. I'm sure there's some stuff I'm missing.



The n/a engine has higher compression than the turbo engine, which leads to issues that must be dealt with using a programmable ECU and lots of experienced tuning.

Justen

+1



Its a very strenuous, expensive, and risky to invest all that money to have a Turbo 6-port Frankenstein engine. Not for the faint of heart, or anyone who is fairly new to rotaries. Very detailed engine build.

Definitely better off with a turbo drive-train swap. But still, before you even think about doing that, you should read up on it a little more and inform yourself on all the necessary steps of doing that as well.

Its important to understand the differences between n/a and turbo motors first, then realizing what needs to be changed and converted if you had a whole 13b turbo spine that you want to drop in.

I'm sure there are plenty of threads that cover this. And don't be afraid to search the other forums and sites as well. Info is Info. Just don't get in over your head by starting on a project that you're not completely confident in. You might want to consider having it done somewhere by an experienced rotary shop if you don't want to deal with the headaches yourself.



And most importantly, good luck