hey! who makes a header for my non turbo 13b....and also can i run a header with no cat and maybe a muffler,// do roatery motors need back pressure?

 

racing beat borla(i think) and a few others. get one off thwe fourum tho, and if you have 5/6 ports run off back pressure you will need it. or wire them open

 

what are ports and why do i wire them open ?

 

My ears are in pain from the thought alone. Your ports open at a certain rpm to give you torque in the low end, there's several ways to deal with them.

 

Back pressure is bad for any motor, but you need to keep up your exhuast velocity.

Here I go again with teh combo

SDJ header
Borla XR-1
N1 knock off.

 

I think he meant to say, they open at a certian rpm to give you more high end power, (the 5th and 6th ports), under this certain rpm, they stay closed, giving you more low end torque.

 

awww, dont be so hard on him. For some of us, this was the thing that got us into cars...

now if you get the idea to put a V8 in your car, then sell it
(jk, dont blow a head gasket lol)

Welcome to the forum, and I have heard lots of good things about the RB Headers and Catback Exausts... from some claiming a 40hp gain. Even if it werent true, maybe it was enough change to make them think that. and as Dreyko said, try to get it off the forum. you might find a better deal from a REPUTIABLE member
(cough cough FC3S Parts Guy is a Theif cough cough)

 

A GTUs is an s5. If his airpump is still there then he doesn't have to worry about his 5th and 6th ports.

I use the Racing Beat collected header.

 

+1 for this entire post

 

hell with it im sellin the car ....bye guys

 

seriously? Why? You can't let some stupid comments get to you.
Basically, I recommend the RB header/presilencer with the catback of your choice.

 

If you do sell the car, make sure to tell the next owner about this forum. Its always nice to have another GTUs owner.

 

ok, so if you run a straght (header-straght pipe-muffler) on an s5 i will need to wire open ports?.....and i already took of my air injector pump and am waiting for my block off plates. i know nothing about roatry motors i got my haynes service manual and thats it..so if you would please bare with me,

thanks for the help

 

Im not positive here, im sure someone else can help if im wrong, but i think you need the air pump to open the 5th, 6th ports. And I dont think changing the exhaust will make your ports not open. I know the racingbeat exhaust doesnt effect the aux ports, not so sure about others though.

 

No, on an S5 *89-91 RX-7s* you don't need to wire open your 5th and 6th AUX ports with a straight exhaust.
Your 5th and 6th ports are intake ports on your motor, they open up at higher RPM to allow more air into the engine for a bit more power.
Now on an S5, your 5th and 6th ports open up with the air pump. So you removing your air pump has eliminated your 5th and 6th intake ports. Either put your airpump back on or you can wire open your 5th and 6th ports.

If you're thinking of selling your car because you don't know what 5th and 6th ports are and don't know how to read the FAQ at the top of the page... good luck.

 

put the airpump back in. it isn't robbing much power and if anything being it isn't opening up your 5/6 ports it's hurting high end power. best way to describe the 5/6 ports is kinda like vtec (yes I know people won't like me but oh well). when the extra intake ports open up it allows more air into the motor by making the intake port area larger and increasing port timing. kinda like putting a bigger cam in your car.


as far as header,straight pipe and maybe muffler maybe not. its going to be LOUD. I mean like cop bait almost. right now I have a header into a test pipe then a motoria exhaust. it's semi ok at lowrpms low loads. rev it up past 3000rpms at WOT I need to wipe the blood off my ears. if you like loud that might be fine. just expect to be easy ticket bait and also it does get tiring after a while as well.

so yes yo uat least want a muffler in the back rather then no muffler like it sounds like you might have been debating on. then you want to put another muffler in where teh cat used to go rather then a straight pipe. it will help a little at least.


as far as headers you have the racing beat though don't know if they are still around but a company named mindtrain used to sell headers as well. from what I understand they had good stuff and might even be better then racing beat.

 

i think my car is just a regular gtu not a gtus,
if that makes any diffrence do i still need to put my air pump back on? i really dont want to, cant i wire them open? or would it run better with the air pump than wire'n the ports open?

so if i run a header no cats and a good muffler it will sound loud up at the high rpm's and acceptable for crusing at low ones? and also will it sound raspy?
"If you're thinking of selling your car because you don't know what 5th and 6th ports are and don't know how to read the FAQ at the top of the page... good luck."
That has nothing to do with ports, i was just assd out that day and it happend to be the day i got some gay thread from some 16yr old TOOL-BAG and i let it get me down....sorry bad day.....i just wanna fix my car ....and i cant get any threads i find usefull on the dang search ,im probally just doin somethin wrong


PS..I dont get down with neons and stickers

 

If you arent sure if your car is a GTUs or a GTU then heres a good checklist to figure it out.

Things to look for:
Manual window cranks(GTUs did not come with power windows)
No adjustable steering column
205/55/R16 sticker in door jam
No sunroof
Aluminum hood
No rear wiper
Cloth interior
Paint: Black with black interior, red with black interior, white with blue interior.
Radio has no cd/cassette
No map pockets on door
If you get to drive the car, you should be at 4,000rpm at 80mph in 5th gear.(4.33dif)

 

gtus had a 4.30 rear diff, and VR spec tires. also look for a 160 speedo.

 

only thing diffrent on that list is i got a sun/moon roof and a casette player witch i took out. manual windows, red on black/grey cloth int , dont know about the hood how do i tell, no rear wiper, and no map pockets so......? i m gonna go check the sticker in a minute
ps she goes 80 in 5th @3200 i think its been a while since i drove the car / and it has a 160 speedo/

 

Yah, i copied and pasted that from an older thread i posted it in. The diff is indeed 4.30.

All the things you mentioned could have been changed. Mine came with different seats and a lot of stuff taken out. Also that could be a dealer installed sunroof. Best way to tell is the sticker.

The aluminum hood will be really light and you can lift with one hand without any problems. The steel hood is quite heavier. You'll know the difference.

 

Some GTUs had a aftermarket sunroof added by dealers. What year is the car?

 

You have a 90, so chances are unless it is one of a 100 or so, it is NOT a GTUs. And starting in 90 all rx7's had a 160 speedo, in 89 only a t2 and a GTUs had one.

 

i just checked the sticker it sez 205/ 60R15 89h

 

GTU most likely then.