efini-7

my cars clutch is going so im bringing my car in to instal an atc 6plate clutch.. so im wondering if i should do a street port and or brige port on it while its in the shop ... i have the stock twin turbo setup on a 93 rhd(japan) rx7... so i guess my question is will the street port give me more horse power even with a stock turbo... or is it only good on bigger turbo applications.

the only other mods on the car right now is the apexi intakes and a kakimoto racing regu92z (cat back) exaust

Mahjik

iTrader: (1)

Answer: Yes.

Question: Why would you rebuild the motor when you only need a new clutch?

arghx

iTrader: (3)

you have to overhaul the engine to port it. It's not like a piston engine where you just pull the head real quick and stick a die grinder in there.

MOBEONER

iTrader: (18)

While you at it you should get bigger cams to increase horsepower.

efini-7

im not dumb its just the guy that is goin to do my clutch also dose rotary engine porting .. i just wanted to see if anyone else has done it with the stock turbo setup

efini-7

i was just not sure if the turbos could handle the extra power ..

turbotoaster

the stock jdm car is 255bhp at the flywheel, i did a big streetport and running the same boost as stock gained 30bhp, just from the porting

You will need a aftermarket ecu if your porting the engine, do you have one?

rx7rcer09

to port you will need 1 a new ECU something like a power FC, and more fuel will be needed so looking at like 1000cc secondaries.

Sgtblue

iTrader: (16)

Turbos don't "handle extra power".
Turbos (essentially) make power. They do it easier at any given boost level with porting...regardless of the type of turbo(s).

staticguitar313

iTrader: (2)

Yes its worth it. I had my car tuned recently. pretty good sized street-port, non-sequential stock turbos. I made 267rwhp on only 9psi. Stock car makes 255 flywheel hp on 10psi. so yeah I'd definitely say street-port is worth it. sets you up for bigger and better things.

kensin

iTrader: (22)

^ sounds like a really safe tune also , what afr"s?

adam c

iTrader: (2)

Porting the engine means rebuilding the motor. That's a big chunk of money. Normally, you port the engine when you already have to rebuild it.

mrb63083

iTrader: (4)

Of course, do it.

Per Rotary Performance:
"...engine porting allows the engine to breathe easier."

"With a street port, more power can be made with less boost."

http://rx7.com/engine.html

staticguitar313

iTrader: (2)

10:1 under boost approx. Car is tuned conservatively until I go single. The port work on this car flows enough to eat the stock junkers.

XLR8

iTrader: (52)

If your going single anyway.... why not have it done then?

I'm a firm beleiver in doing things all at once. It looks like you are paying to have major work done. If your car isn't your daily and you don't mind it waiting for you to get everything together to go single, then do it all at once.

I am doing this exactly. I have a good running twins setup with bolt-ons. My engine is very healthy. But I am going single, so what does that entail? Pulling the engine, rebuilding and porting, fresh tranny, new clutch, V-mount, single setup, and all new fuel.

Doing it this way is a big project, but everything is done at once. There is no backtracking & I don't have to worry about there being a weekest link because it is all fresh at once.

But to answer your orgininal question,... Yes. A SP will increase flow & overall power. Turbo will spool quicker, and create more power on lower boost.

t-von

iTrader: (8)

You don't learn half the things you could by doing things all at once.

no_more_rice

If you already know what you're doing, that doesn't matter. I agree, get it all done it once. Bigger capital investment, but less O&M. problem is many owners of these cars don't have thousands of dollars in cash laying around, which is required. I easily spent $7-8k on my build when all was said and done, but four years later it is stronger than ever.

adamrs80

iTrader: (7)

Does he do rebuilds too? Does he specialize in rotary engines? Sounds convenient but I hope he's a rotary expert who also knows how to swap a clutch, not a transmission expert who has done a little porting here and there.

staticguitar313

iTrader: (2)

I'm a believer in actually driving my car. So the car is tuned to run conservatively on non-seq twins until I collect my single turbo parts and have my friend weld up a custom manifold. Once the setup is completed I will have the car re-tuned for the new setup.

mattdavispv9

iTrader: (7)

lmfao.... WOW

Mestre

I'm personally looking for a secondary motor to do all my fun stuff to... I would rather drive my ride for the time being while its so nice out (last summer was way too rainy and cool to really let loose as often as one would have liked).

That aside, I do think that its better to do CERTAIN mods all at once. Too much too soon and you risk having to trouble shoot too many different things when something goes wrong off the start.

And like everyone else has said, getting a street port will open up the engine for a lot more power down the road and you would notice a notable difference with even the stock twins.

tabuk1!

iTrader: (5)

I've learned a lot from this thread so I was wondering how a street port with the stock twins would compare to a street port with BNR Stage 3s running them sequentially...? Realize there are probably a lot of variables here...don't the Stage 3s really shine with increased boost (over 15 psi)..? But, if I remember earlier in this thread it was mentioned you get more hp at lower boost with a street port..?

thanks

XLR8

iTrader: (52)

As will I.... Been driving it at least 3 times a week. Once all my build parts are collected, shouldn't take more than a month or two to get it all sorted. BTW, this will also be in the winter, when I don't drive my car anyway

djseven

iTrader: (56)

Just saw this, you picked up 30hp with the same factory exhaust, intake etc? Doesnt add up honestly. Now if you added a full standalone to tune it might be possible. I assume there was some exhaust modifications on your car, however, Ive been wrong before.

To the OP, if you arent going to run a standalone dont get it ported, or at least not much more than a little clean up of the ports. An engine with a good sized port job will run like **** on a stock ecu or remap ecu car at idle. Fuel economy is ridiculous also along with usual ignition break up at higher rpms due to fouled plugs. Once again, I still dont understand how getting a clutch leads to porting work.

djseven

iTrader: (56)

I made 285 on 9ish pounds with stock ports, full exhaust and stock ecu. Ill ask you the same question I asked the other guy, does your car still have the full stock exhaust(pre-cat, cat, stock catback)? If not, it is hard to compare your numbers to the factory 255bhp.