2nd Chance

iTrader: (1)

Borla definitely sounds much better

BlueWarrior

Well now with my question answered and some extra advice added in there for good measure (great responses everyone) I have come across a different question. Since I have an S4 N/A how much would going with high flow cat/cat back really affect my car? Seems like theres not a lot of horse power I can really muster out of an engine without a turbo

archaphil

iTrader: (1)

forget a high-flow cat on NA. Main reason is the aux ports more then likely will no longer work or even have the hookup for it. And yes, a header on NA certainly lets you know the engine is there WOT. Normal driving is not bad.

I just had mine out tonight for a serious shakedown, and I simply cannot ask anything more of my cheap setup. Flows, Performs, and works. Now, my turbo setup.... is a whole other discussion.

BlueWarrior

So I'm wondering if I can just find a way to change the subject of this post now lol.

I've been doing some crazy amounts of research because I'm really dying for some information about engine swaps. I've found tons of articles online and on the forums but I'm not finding one for my question per say. I'm looking for information about swapping my S4 NA engine to a S5 Turbo. I've found articles about S4 NA to S4 Turbos and S4 NA to S5 NAs but not S5 turbos. Lemme know if I should make a new Topic LOL

Jager

iTrader: (10)

Rotary Resurrection home of the budget rebuild.

gossman

I am the 2nd owner (hand me down - dad purchased new in 1990) of a NA FC3. Have not driven it much in the last couple years due to excessive heat in the cabin (suspicion is that it's from the tranny tunnel/exhaust). Have come to the realization that I either fix it or it git rid of it. I live in NC and emissions is not an issue.

Been scouring the web/forums and have determined by courses of action:
1) change tranny fluid and use quality synthenic - looked at Redline MTL, but found Valvoline SynPower (GL-4/GL-5, 75W-90) (locally sourced and purchased - plan was today/tomorrow)
2) clean up tranny tunnel from underneath and install heat shield (already have the cleaner/degreaser) - looking at something like the DEI: https://www.summitracing.com/parts/dei-050503
3) change out the cat... this is where I am in search of help/guidance.
4) Inspect/change out shift boot and insulation

I have looked at various cat replacements.. but the biggest question is the feedback air line coming out of the OEM cat. Since I am doing all this work, I would like to tweak out some more HP (car doesn't seem as responsive as I recall when I was younger). I looked at:

RX7.COM | 1986-1991 Rx7 Exhaust (330)7-ROTARY

Debating the Bonez Superflo or the Bonez Racepipe (looking to keep costs down) -- however, in looking at these, how is the air pipe handled AND what side effects (gauges, sensors, etc).

And, if the air pipe solution is simple (I.e. just leave it hanging or remove), then what about the Pacesetter from RockAuto. 1/2 as much as the Bonez Racepipe and from my understanding, using this (since emissions is not an issue and the wife wants to keep costs down) will also gain some HP.

But... if it's recommended to handle the air pipe (archaphil mentioned "forget a high-flow cat on NA."), then does the Bonez Superflo have connections to it?

If not, what's a recommended (direct fit) replacement? I see in the manual that there is a front converter as well as a main converter? Do I need both? Can I replace both with a single? Keep in mind, trying to keep costs down!

Looked at swapping the head to the Pacesetter, but again, trying to stay on the inexpensive (However, it the pacesetter set up is on par with the other, I'm good with that).

Sorry for so many questions...

Jager

iTrader: (10)

Always good to take care of regular day to day maintenance.
I have looked at various cat replacements.. but the biggest question is the feedback air line coming out of the OEM cat. Since I am doing all this work, I would like to tweak out some more HP (car doesn't seem as responsive as I recall when I was younger). I looked at:

With the Superflo you cut off the flange of the air pipe and use a small piece of tube to connect the car to the split air tube. It'll keep you 5th and 6th ports actuating. Everything else is normal.

The racepipe I am not familiar with, but judging by the picture they don't have a provision for the split air tube.

Down Pipe / Presilencer Kit for 86-88 RX-7 NT Auto - Racing Beat

This will do everything you need and will be 100% bolt in.

Pacesetter isn't thought to be the best quality but it'll work. Just weird welds and stuff, but it'll do fine. The OBX is a Chinese SS copy if you want.

You'll want just the cat by itself.

The superflow goes from the manifold to the catback portion.

The pacesetter replaced the manifold and allows just the main cat or the rearmost cat. So you will just need this one: Rotary Performance Bönez Performance Main Converter

You can also use a catco or magnaflow cat if needed.


CTO-4689 is the Catco part number, it's just a direct fit.

If you use the main cat race pipe (Rotary Performance Bönez Race Pipe Main Cat) you can bypass the main cat, but you'll lose 5th and 6th port function through the exhaust.

You just need the rear cat if you choose to keep it and since you do not worry about emissions.

What is your budget sir? That'll help.

Down Pipe / Presilencer Kit for 86-88 RX-7 NT Auto - Racing Beat

That downpipe and presilencer is really amazing for all that you get and will fit awesome. I recommend Gummy Grip for all your Racing Beat needs, but e-mail them for the best pricing.

Las Vegas Aftermarket Performance Parts Shop | Gummy Grip

I know people have gone with the OBX header and main cat replacement pipe, it'll be cheapest and LargeOrangeFont didn't have anything bad to say about it. OBX and Pacesetter are the same design.

If you want, just have a shop make a pipe to connect to the catback portion, probably cheaper than the 80ish dollars from RX7.com.

Don't forget the For Sale section either, post a WTB and find whatever you need.

Keep asking, its how we all learn.

Hot_Dog

I've been through a couple Bonez Superflo Systems over the years on my NA S5.. They'll last you probably about 10-12 years. As Jager mentioned, there's a 1/2" tube coming off the side of the cat for the split air pipe. There's no flange on the 1/2" tube, but rx7.com provides a short piece of silicone hose and clamps. They want you to cutoff the flange on the split air pipe and connect it to the cat with the hose. I usually either cutoff the original flange on the Mazda cat or fab my own flange and have it welded the the replacement cat. Most muffler shops will do this weld for about $20 if you bring the cat and flange to them prior to installation. I like to keep the system stock by retaining the flange.

During my last cat replacement, which was about a year ago or so, I installed a Racing Beat down pipe (Down Pipe for 86-91 RX-7 - Racing Beat) and the rx7.com Bönez Catalytic Converter (SKU: EX800655). Like before, I fabbed-up a flange and had it welded to the tube on the cat. Although there's no presilincer on this setup, the noise level is about the same as the superflo system. The RB down pipe is very high quality heavy gauge steel which helps deaden the loud rotary exhaust noise. This is the setup that I'd recommend, but if you don't have the cash than the Bonez Superflo is the way to go.

Also, I've used the Valvoline SynPower gear oil before and I wouldn't recommend it. I had problems of mild gear grinding when I used the Valvoline. Although Valvoline claims it's GL4/GL5 compatible, after searching other forums, I've came to the conclusion that it's not really GL4 compatible. There's very limited number of gear lubes out there that are truly GL4 compatible and Redline is one of them. I highly recommend using Redline MT-90 gear lube. Attached is a paper that I downloaded off the web that discusses the differences between GL4 and GL5 gear oils.

gossman

I ordered the Bonex Superflo from rx7.com a few days ago. Haven't received any confirmation on shipping and I have tried calling and nobody picks up. Wonder if it still doing business. Might cancel that order (if I can figure out how) and order the Racing Beat.

Hot_Dog

Maybe they're operating with reduced staffing due to COVID-19?

Jager

iTrader: (10)

It's a one man shop, so it may take a day or two to hear back.