Cpt Gunmetal

Hey guys and maybe even gals haha. Well I decided that I will rebuild my 88 SE at 200k miles and then port it once I get a good handle of all her stock capabilities. I will most likely go for a bridgeport since the first few seem like a waste of time and money. Go big or go home hahaha.

Anyways, is there specific aftermarket exhaust systems for ported engines? I've done a bit of research and they always say that I would need an upgraded exhaust from stock, but that is about it. I usually see Rx7s with Apex or Racing Beats online so is that the way to go? I have to say that Racing Beats sound pretty smexy !

ramo

iTrader: (30)

get your 3 in dp, high flow cat or straight through midpipe, and a 3 inch pipe cat , whatever brand you want, and the tip could be larger then that if you want

I wouldnt say theres a specific exhaust just for porting, its generally a good idea to do a dp and cb, i def wouldnt stick with the stock cat though.

dwb87

iTrader: (22)

Port it after having it rebuilt? Why? Save yourself some money and have it ported while it is being rebuilt... The engine will already be open. Makes sense, right?

ramo

iTrader: (30)

didnt even notice that at first lol, yea that wouldnt be wise to port after its put back together..

Cpt Gunmetal

True 2 birds one stone. Thanks guys!

RotoryDave

I just got my bridge ported motor back and installed I went with a 3¨magnaflow sustem and i only have 1 muffler and I love the sound ( pics are in my album) if you go with a 3¨ you can always go Turbo later wans you get use to the power of the bridge port LOL

Cpt Gunmetal

I do plan on doing a T2 swap later on. Would the exhaust system have to be traded out for a different one?

Evil Aviator

OK, but just realize that going big will cost about $10K, and will leave you with a very loud car that sucks gas.
TurboRX7.com > Porting Pictures
Bridge Porting
86-92 6-Port Exhaust
Services

Those Racing Beat and Apexi bolt-on exhaust systems are really more for stock or street-ported engines. While you can certainly use the generic pre-fabricated exhaust systems, you will need to go custom for maximum performance. This link expains the basics and how to size the primary pipes. After the primaries, it is generally recommended to gradually increase the size of the pipe for the remaining components. Most people consider 321 stainless steel to be the best overall material.
Rotary Tech Tips: Exhaust System Configurations

Here is what a bridge port sounds like in traffic:

You would need to swap out the header for a downpipe, but otherwise you could use the rest of the exhaust system. However, if you plan on high hp for the turbo engine, then you would want larger exhaust.

Cpt Gunmetal

[QUOTE=Evil Aviator;11415247]OK, but just realize that going big will cost about $10K, and will leave you with a very loud car that sucks gas.
TurboRX7.com > Porting Pictures
Bridge Porting
86-92 6-Port Exhaust
Services

Where would the hefty price of 10k come from?

Evil Aviator

Fast cars cost a lot of money. If they were cheap, then everybody would have one.

In general, here is where price rises on a FC RX-7:
- When 200-230 bhp is exceeded
- When the engine operates past the OEM redline rpm
A bridge port does both. Also, were you told that a bridge port engine typically only lasts about 30,000 miles?

Here is a basic build list for a bridge port engine setup. It would actually cost more than $10K, but I assume that you would be able to find some used parts or cheaper labor costs. If you wanted a professional full-race setup (lightened rotors, Motec ECU, 5.5" 2-disk clutch and flywheel, dry sump, cc'd 321 SS exhaust, etc.) then you are looking at well over $20K.
$5396 "C" level engine rebuild *
$1020 Standard bridge porting
$0080 Lapping
$0170 Rotor side clearancing
$0280 Balancing
$0110 Shimmed oil regulator
$0305 Koyo Radiator
$1300 Pre-fabricated streetable exhaust system
$0350 Upgraded clutch / pressure plate kit
$0500 Lightweight flywheel and counterweight
$0350 Scattershield
$1000 Haltech Platinum Sprint RE ECU with flying lead
$0350 Aftermarket 550cc fuel injectors (4 new)
$0110 Walbro 255LPH fuel pump
$0180 Aeromotive A-100-6 fuel pressure regulator with gauge
$0250 Various hoses, fluids, filters (estimated)
$0500 Professional tuning (estimated, could be more or less)

* I am assuming that carbon apex seals will drop the price of the engine rebuild by a bit, but I am not sure if there are other services required for high-rpm prep (locked bearings, e-shaft oil mods, etc.) that would make up for the price difference. Also, I am assuming that your engine does not need a full rebuild at the Mazdatrix pricing of $7311. You can get these services for less money than Mazdatrix, especially if you hire a shadetree mechanic, but this is a good general outline for pricing. Also, the above is limited to 10,500rpm, and you would need better components (lightened rotors, racing clutch/flywheel, etc.) if you want to exceed this level.