what is the general setup for a bridge motor for street use?

 

In my personal opinion "bridge" and "street use" don't belong anywhere in the same sentence. Saying that, turbo or nonturbo?

 

LOL, I'll have to post a video of my 1/2 bridge at cruise. I can cruise in traffic at 2000 rpm with mine. However I feel the s/c really tames the issues of the bridgeport.

 

Maybe I Should Have Said A Setup That Makes Less Noise. Non Turbo

 

I could really post alot of reasons why a bridge is and/or is not a good thing for street use, track use, turbo, superchargers, nitrous, etc but I won't. Everything has it's place though.

 

I like my P-port on the street...

 

How's the gas mileage? How loud is it? Could it pass an emissions test if it had to? Can you make it idle glass smoothly at 750 rpm. Does it like to cruise at low load levels? Could other people, namely any other random person out there who isn't a rotary fanatic, drive it smoothly and easily without hassle? I think you get the idea. Willingly putting up with something doesn't make it "streetable". It makes you "tolerant"! There's a difference.

 

well i don't think I'm worried about those things as much. With that been said does anyone have any answers to the original questions?

 

Don't know, don't care. Pulsewidths at cruise suggest 25mpg at 60.

Same exhaust as I had on my GSL-SE engine, which was the same as what I had on the stockport 12A that came with the engine. It couldn't pass emissions, but then neither could the GSL-SE engine. For that matter, it couldn't pass because they won't test an '84 car.

It *is* louder at idle and super low load work, but that's because the engine is under "higher load". Once rolling around it's tame and on the highway it sounds and drives just like stock unless you back all the way off the throttle. EFI is a glorious thing. Too bad about the misfire problem. Or the crappy air filters, my MAP reading goes to 85KPa over 5000rpm The throttle body's too small too, guess I was wrong about that assumption.

I have yet to have ANY rotary idle smoothly at 750. They all like 900 or so at a minimum, even before you figure the charging system not really working below that speed. Cruising at low load is actually doable. It gets all staccato but it doesn't do the paintshaker thing like it did with a carb.

Probably not, but the same person couldn't drive a stocker either. (What do you mean I can't shut it off cold?) Plus there's the aftermarket EFI factor, and very very few installations of EFI are OEM lever set-and-forget. To start it cold, for instance, you have to cycle the key three or five times before trying to start, due to a software limitation that won't allow the engine to get enough fuel when cranking. It really needs about 40ms injection pulses when it will do only 25ms, so you either have to cycle the ket or pop the hood and hose one of the air cleaners with starting fluid. (Once it kicks fast enough to get into the main map, it will run just fine)

No cold idle control so you have to nurse it at a stumbly 900rpm until it warms up... but then my GSL-SE engine was like that too.

 

My streetport can idle at 500 rpm although I hold it around 800 and it does it glass smooth.

You know I'm just busting your ***** don't you?

 

Sounds like you guys run backyard exhaust- like a 3" exhaust all the way through

 

So many people are twisting my **** over the P-port that I have to wipe with a Slinky Mainly I built it because I got tired of people basically saying "OMG THEY IDEL AT LIKE 3000 AND DON'T MAKE POWER UNDER 8000 AND THEY MAKE BABIES CRY FROM 2 MILES AWAY". And the best way to disprove is to just *do* it.

My exhaust, well, kinda sucks. The GSL-SE really liked it, anyway. Pulsewidths suggested 160hp at the crank but the engine quit the weekend before free dyno day, so we'll never know.

It's just a 12A Mindtrain header (slotted/ported to fit 12A or 13B, *that* was a lot of work) and a 2 1/4" cat and a Mindtrain muffler. Oh, and the stock Series 3 12A midpipe, still has the heat hazard sensor in it even

Hey at least I replaced the Mindtrain presilencer with a cat. For one, I needed to do that to pass emissions (a year or so ago) and for two, it was something like 1.5" inside diameter and louvered. Super quiet but about as powerful as a factory exhaust system...

 

The setup im thinking of doing is a 2 int 1 header going into a dynamax(as the cat) 2 1/2 inlet and outlet going over the DIFF and into another 2 1/2 dynamax with dual outlet. What do you think? This is for a bridgeport

 

twin 2" system, a resi in each pipe, a well made collector to 3". Then a Borla, Rotaflo, or even an RB. They 3" Rotaflo RF300's made around 700HP on Pac's Rx3...and had reasonable sound...although there was a snail cutting some of the noise.

 

thats a real man's statement.

 

intresting

 

If you want smooth running and quiet exhaust then go buy a Lexus. LOL or a keep it stock. I drive my full bridgeport on the street and yes it is loud. It idles at 1000rpms and gets crappy mileage. But it also kicks *** and that is why I chose a bridgeport. Next is a pport. The pport actually has more low end and all around better power range than a bridgeport so the people that keep saying they are not streetable are ignorant. To answer the gents question- bridgeports and pports want as little backpressure as possible. Mine is RB headers into 3" all the way back into a RB 3" stainless high flow muffler. This is even a little too restrictive for full performance. You can choke it down and put three mufflers etc and it will be much more quiet but you will lose massive horsepower. Here's a vid of mine on the street. Nice and smooth and quiet no?

http://www.youtube.com/watch?v=wazGzisCObM

 

what about those that don't have a smog free rx2 and still need to hide from the cops

 

go turbo. turbos make good mufflers.

 

so turbo + 3 mufflers = lexus quiet?!?!

 

See...now that's what I'm talking about! My PP in the works will only be a little louder..on the intake side.

So you have 3" with no presilencers to one of those universal 3" RB's? or a Turbo II version. It sounds tight man, excellent 2. See you at Alberts!

The only thing that sucks with large ports is you're the only noise on the road at 1am +.....its so much fun when you get a cop behind you at a light....OLD SKOOL rides for the win! "**** officer....its old, whad'ya expect?"

 

So you have 3" with no presilencers to one of those universal 3" RB's? or a Turbo II version. It sounds tight man, excellent 2. See you at Alberts!

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Yeah, that's my exhaust- no pre silencers and straight through.

If you are looking for a quiet N/A high preformance rotary, stop looking because you'll never find one. You can get some good performance from a turbo setup and still retain some decent quietness, but even then your limited too.

 

ive seen it done.