cls6888

ok i used the search and its acting up for me and saying no results found etc.

i have a 87' turbo





if i go with this exhaust

what all do i need to know installation wise.. and about the ports etc.?
thanks

http://cgi.ebay.com/ebaymotors/RX7-T...16919444QQrdZ1

RexRyder

iTrader: (10)

you dont need to know anything to intsall it, just unbolt your old exhaust and put that one on. And what about the ports? If you refer about the 5th/6th ports, turbos DO NOT have them.

J-Rat

iTrader: (2)

ugh...

cls6888

ok sry bro... i kno about cars etc.
but i just picked up my rx-7 and still learning everyhting bout rotarys and there whole setup.
THANKS MAN

SpiffyD

well... he says it all

cls6888

with this exhaust system would i need to port the wastegate etc?

Funkspectrum

iTrader: (5)

port the WG if you open the exhaust up....

cls6888

wut do u mean by open the exhaust up???

RexRyder

iTrader: (10)

if you run without a catalytic converter=open exhaust.

NZConvertible

If you install that exhaust your boost level will almost certainly rise to the point where fuel cut is activated (8.6psi) because the S4's wastegate is too small to control boost properly once you increase exhaust flow. You need to remove the turbo and port the wastegate as big as possible to prevent this. This will allow you to keep boost below the point of fuel cut. If you want more than 8.6psi you need to install a fuel cut defender (FCD), but you should not do this without at least upgrading the fuel pump.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/serious-s4-wastegate-porting%85-343788/

cls6888

well , would it b recommended to port wastegate even if i kept the cat...?

cuz im trying to stay away from porting at all possible becuz , im not 100% knowledgable with the rx7 yet and i dont really want to have to take apart my turbo and engine just becuz of exhaust.

NZConvertible

You don't need to touch the engine, just the turbo. See the link I posted.

The cat might keep boost low enough, but it might not...

NISRCelica

If it's not a HF cat, it should be fine, should'nt it? Don't qoute me on this guys, it's actually more of a question than a statement.

cls6888

^ is this true???

First gen man

iTrader: (24)

Depends on the rest of the exhaust as well. If you have a hi-flow cat, and a really restrictive exhaust it'll control it. Just depends on your exhaust flow overall. cat's will severly screw some exhaust flow up. Therefore keeping boost under control. . Just port out your wastegate. Pretty easy. Find a write-up around hear somewhere and follow it. Completely fool-proof.

cls6888

ok well say i were to get the dual exhaust that i posted off ebay...

would i need a diffrent cat or will that "race cat" restrict it enough?

NISRCelica

Good lord, no. What is that, 80mm? If you get that your gonna need some wastegate portage, no?

rotary downshift

seriouslt thats a nice exhaust system and all but i know from experiance that the doul exhaust setup is way to damn heavy for these cars and in the long run more restrictive because it has a y pip set up .. so its more cosmetic thaNanything .... i know from experiance that a free flowing exhaust with 3 inch pipe racing beat header and freeflow ractive apex i muffler both saves weight and adds hp and lbft of tq .... i had a dyno slip of my car and with the simple exhaust mod im pushing not 210 hp and 200 to the wheels .... dont ask how .. oh and i have k&n ... but with stok intake .. so not much difference ...
so my point is ... jst go custom single 3 inch and ull be happier

RexRyder

iTrader: (10)

They advertise it as a race cat, but its not a cat at all, just a muffler or presilencer. So yes port your wastegate.

cls6888

wel lim goin for looks and power and i dont really wanna go with single exhaust for the fact id have to fill the other exhaust hole on the bumper and then repaint it becuz i dislike the loook of single exhaust with a extra hole in the bumper.

NZConvertible

Oh great, another completely ignorant post about dual (doul?!) muffler exhaust systems.

Way too damn heavy? The weight difference is well under 1% of the car's total weight. If you think you'll notice that you're kidding yourself. You add several times more weight than that filling the gas tank.

More restrictive? You need to learn about how pipe sizing affects flow far more than a Y; specifically how two correctly-sized pipes car easily outflow a single pipe.

cls6888

after reading through the forums a good amount it seems like a decent amount of people r putting exhaust on the turbo II and not porting the wastegate or putting a fcd on right away atleast...
is this a must need...? as u can see i really want a new full exhaust system but AS OF RIGHT NOW, i wanna stay away from having to port the wastegate and install a fcd and fuel pump.

??????żżżżżż

jdmsuper7

iTrader: (1)

If you NEVER drive it hard, you will be fine without a FCD/wastegate port. However, first time you hit the gas hard in the upper rev range, especially in 4th or 5th gear, you are going to hit fuel cut, which is rather unhealthy for your engine. If you are not comfortable doing the WG port (and it is really easy, and this is coming from someone who had never used a die grinder before I di my WG), just rig up the FCD, as that is quite easy to do. However, that brings about a whole new series of potential engine hazards, as it is easy to end up with more boost than you have fuel with just the FCD.

NZConvertible

If you leave the stock DP and TID in place (i.e. cat-back exhaust and pod filter only) you'll be okay, but upgrade either of those and you will hit fuel cut. If you then add a FCD you'll find you're boosting too high to be completely safe with a stock fuel pump.

Sideways7

iTrader: (7)

To sum up, you can just install the exhaust, but you run the risk of doing serious damage to the engine, especially if you just put on the FCD. Don't you think its worth the little extra money and effort to avoid the huge money and effort of a rebuild?