bridgeport or big street port for drifting and roadracing
 

just like the title says, im deciding on weather or not to bridge port my s4 N/a motor. i am not really worried about drivability, i will be breaking the motor in on the street tho. any feedback is appreciated!

make sure you have a good clutch!

I never really played with N/A but if you are seriously gonna Drift and do road courses you will need some power.....I would maybe go with a half Bridge.

Try keeping the primay ports not incredibley huge to maintain some smoothness on the lower end and you will be good to go.

It depends on the exhaust system you're using... if your system is street legal you won't get any benifet from bridgeporting (exhaust will be too restrictive), so you may as well go with a large streetport. Plus its more reliable in the long run.

the thing about it is i dont care if its legal on the street. i can get inpection stickers for like 70 bux no ?'s asked. i was thinking about doing the bridging the secondaries as well...

It's not that bridgeporting is illegal, its that unless you have almost a no restriction exhaust, the backpressure will render the bridgeport unless, and you will be back to the power of a streetport anyways. If you plan on making the exhaust system completely free flowing, then bridgeport it, otherwise keep to street. If you come to Va and they catch you with an illegal exhaust emissions wise... its a $10,000 fine regardless if you have a sticker or not. I'm all in favor of playing with fun cars too, but be careful. I'd hope Dallas is different... they probably don't care much down there.

a big street port is a peaky thing. go bridge! :)

Sleeper RX7 makes a good point with the exhaust being too small. If you run a good exhaust the bridge will kick ass. It will be LOUD though.....its cool for a while but after about a month you will get tired of screaming inside your car to talk to the person next to you.

As far as bridgeporting goes you normally Start with the secondaries....that is a half bridge a full bridge is when you bridge the primaries as well. I think a half bridge will do what you want to do.

well sleeper rx7, what i was implying by saying i dont care if its legal or not was theres no way im getting a restrictive exhaust if i go bridge. therefore, i would most definatly not pass emissions or any of that.
anyways, ive decided to bridge the secondaries (thanks ranzo) and ill probably go with RB header to a custom mid pipe and apex'i N1 catback.
thanks for the help guys, if you have any more advise keep posting!

whats "peaky" mean?

Nice, have fun and let me know what kind of hp you're getting. Also how loud it is... if its not too bad maybe I'll consider it someday myself. Good luck.

And the bridge isn't???
I don't get it...I dunno how ANY bridge is going to be "less peaky" than ANY street port?

To the original poster, I would practice your driving skills before worrying about the ports on the motor.  I think an 2-rotor NA cannot make enough power for proper drifting (pro/competition level), and going with radical porting techniques just kills the broad, flat torque band that makes it easier for drifting.


-Ted

Wow, 11 posts and nobody's said he needs to check the rule book to see what's legal yet...
The ever present "what series, sanctioning body will you be running in?" apparently isn't.

That is the beauty of drift.........there is no cry baby classes or restrictions on the engine or power levels. You can either drive or you can't

I didn't say anything because I'm tired of saying the same thing to the same type of people and getting the same "I don't care" response.

F*ck it, if they want to build a car like that, go ahead. Just don't bitch when they don't have a class for you or you're too slow in the class they stuff you in because you didn't bother to read the rules ahead of time.

PaulC

I guess you can call it cry baby classes, personally I agree with you. But see, I'm not a showy person. I don't care what you think about my driving. I don't care what anyone else thinks. I want to beat you. And him. And her. I want to sit in a car, make it do exactly what I want, and pressure you into a mistake. I want to worry about someone 2 inches from my door as we dive into turn 1 wondering who's going to lift first. I enjoy the feeling of turning .2 seconds a lap better times than the other guys in my class.

But see, I'm also not a rich guy. I do ok, but I'm not made of money. I have to work every day, and I try to have a life after work. I don't want to work two jobs to afford a rebuild on my tweaked-all-to-hell motor because the humidity changed yesterday and I ran 1psi too much boost. I can't afford a tube frame Porsche 911 turbo with slicks and wings. So I have to deal with cry babies in my class. It's the price I choose to pay.

But I'd do that long before I let some primadonna prick on the sidelines decide that Jonny won because his 'drift' was more impressive.

Please.

PaulC

i understand where you are coming from silkworm, but first and foremost this car will be a DRIFTING car. i just put road racing in the title because i know for a fact that i will try grip, maybe in this car, and probably make a different car sometime in the future FOR grip. i dont think that having a neutral judge say weather its a touchdown or not because of what he saw has anything wrong with it, so why is having a judge say that someone else's drift looked like he had better control of the car, went faster, had a better racing line, and over all just looked cooler have anything wrong with it? closed minded ppl need not apply.

oh, and if i can make a 45 hp blown motor drift and look ok i dont think that i need tons of power to drift....

hahaha I love it........ I agree with the judging aspect of Drift and I love being doorhandle to doorhandle with someone going into a corner and seeing who will lift first as well. At the same time I don't see the need for all the classes and restrictions that are out there in some of the SCCA races.

We run autocross here all the time and the classes have nothing to do with the times ran. I wonder if in the SCCA autocross do the big powered cars turn faster times than the more regular cars. I know alot of it depends on the course but In reality does the car make that much of a difference overall.

Sorry Glitch, I wasn't really responding to you, but to Cwaters :) Drifting is fine, if you can do it, good for you! I actually happen to enjoy watching drifting, and I totally respect those who can do it, they have, in general, excellent car control skills, and the modifications required for good drift control mirror many required for good road racing. (Please, I'm not Takumi, save the 'grip' crap for the Lounge)

Next time referees judge Brady for how well the ball spiraled, you let me know. We have rules in road racing, we have rules in football. We don't judge how good our technique is by any measure other than who gets to the white line first (or the most often in football). I don't care how ugly your move was, how often you went off course, or how bad your car control is, you get to the line first, you win.

Oh, and you're the one talking about a bridgeported motor on the freaking street here, not me. What'd you drift in, a raging rain storm with 155/60/13s?

Ranzo, you and I should have a drink sometime :) You hate the things I hate, and you like the things I like about both sports ;)

PaulC

actually, i dont know the tire diameter of the two spares i used on the passenger side of the car, but yes, when i went out it was usually raining :D then i started getting to where i could go out in the rain with shitty tires all around on stock rims, then i got to where i could have fun on dry blacktop with shitty tires. then the rest of the motor blew.... (oh i got the car for free, and already blown ;) ) im really suprised that the front rotor stood up to so much abuse.


oh and the 45 hp comment was directed at RETed.

streetport is all you need

Maybe I will take you up on that Drink someday.....

Dude, you have no clue what you're saying...

My reference is to pro/competition level drifting.  If all you care about is the one-weekend-a-month track day event, then you can take a Yugo out there for all I care.  Ranzo knows what I'm talking about, and we've traded ideas before you even KNEW what "drift" was.

I do tech for a couple guys down here who are at the "club" level.  One of the guys used to own a 150hp+ at the wheel NA FC, which he realizes was a total waste of time.  His last vehicle was a turbo FC running a Haltech putting down an estimated 230hp at the wheels at 7psi.  The current project is a 20B NA shooting to get as close to 300hp at the wheels.



-Ted

i guess i failed to mention that this is a track car. it will probably be used about 2-3 times a week at a track. also, this is a learning engine, not my final decision on what i want to try and go pro with. all i want right now is something that can help me along in the learning process, not some high-dollar turbo with haltech making 230 at 7psi. i will eventually throw in a turbo motor and drivetrain when i have either blown this motor or have gotten too bored with the lack of power. i dont see why you have to be rude when giving advice. its still appreciated, but to a lesser extent because you are trying to degrade me at the same time.