Hey guys im wanting to know a few answers to some p-port questions i have. I am 15 and i am wanting a p-port daily driver. i am thinking about racing beat p-port housing and manifold an 51 or 48 ida carbs. Since p-ports suffer low end power i thought to put a turbo on it and run 3-5lbs. the i dea of the turbo is two create enough back pressure to give me some low end power but be able to not loose all the top end that i would be if i just ran small exhaust piping. So with the turbo i would be causeing alot of back pressure for low end power and all the piping needed for a turbo would cut down air velocity give it low end but since it is a turbo it would be blowing at topend making some power back right. if i did this set up would my idea work and do you think i could hoo it up where i could use the stock computer and use big injectors.If not the turbo setup would either need blow through carbs or a microtech. Also i am wondering if p-ports have any other flaws like the s4 t11 that have the start promblems. also does anyone have any experience with p-port from racing beat and what was your setup and where was your power and idle?

 

i think ur better off going with a streetport.....just my 2 cents (canadian $0.028)

 

i didn't read all that crap u wrote, but got the main jist of what u are talking about...

my mate had a 12a PP in a rx4 sedan. and it was ok. but the problem was that he had the stock rx4 diff ratio, which is 3.9:1 thats way high for such a high revving engine (got to 100km's in first gear), if u do go PP get a 4.4:1 or a 4.8:1 custom diff. so u can get the revs up, and not really worry about down low torque. its a rotary, they don't work like a V8.


um, turbo i dunno how that wourld go, daily driving... but the jiuce it would drink would be rediculous. Go fuel injection of course, and run FC injection manifolds. **** 5lbs of boost, a PP works in the top range and with the right diff ratio, u won't need to worry about revs below 4k because you'll be revving like nuttin else. So run sumthing like 15lbs or more.

though u will need to spend heaps on the engine getting it build properly, strong and tuned well. i dunno where a 15yr old gets that sorta money from

 

NSU's were PP from the factory so it can be done. If you want to make it easy to drive you will probably only make the same power as a side port though.

 

ummm, regardless of where in the rpm range you want to make power, backpressure is a bad thing. It's not backpressure that creates low-end torque, but thats a common myth. when people put a big exhaust on a car and lose some low rpm power, it's usually due to the fact that the piping is too big and the exhaust coming out loses velocity and you lose the scavenging effect. there's a lot more that could be written about it but I'm at work and gotta keep this short.

Anyway, check with racing beat if want info on set ups for a p-port, they've done it all. Just remember, it's easier and cheaper to build a motor that will handle a little boost than it is to build one that can handle p-port rpms,9000+.

Go turbo street port

 

errr......

I thought you COULDN'T run boost on a PP (?) due to the massive overlap on the port timing. Most of the boost would just be spewed out of the exhaust.

 

i think thats why they run incredible amounts of boost, and not just 5lbs.

also correct timing and shaped ports are made.

 

idle on most pports is about 2000rpm, but thats because theyre made for max power, if you want one for a daily driver, buy an NSU, or hope no cops live in the same state.
true about the porttiming, you can run a pport no problem on the street.

you're thinking about this way too much, just get some goals (n/a or turbo, how muich power, how much money) and then start figuring out the best ways to do this.

also a turbo that only puts out like 5psi topend would be gigantic. for that kinda backpressure you could maybe try a butterfly in the exhaust, like electronic cutouts, but cut the edge to leave room for exhaust to flow.
anyways, im sure i made little sense.

 

butterfly in the exhaust? Christ I'd hate to have to service that bugger

 

your best bet for a daily pp would be a supercharger. this will help give you the low end the reason pp run kinda shity low rpm is the over lap. burt gases get push into the intake charge. So if you run a boost pretty much off idle would run good. A pport will also last alot longer the a birdge port. you will also need to run steel seals with boost. you shouldnt ever run boost on carbon seals i feel. A turbo would work but it will make more back up into the intake off boost. But a turbo will make alot more power. I think its like every 100 hp a supercharger draws 30 hp.