norberts94fd

I have a 94 rx7 that is stock besides a downpipe and catback and my engine needs to be rebuilt.I want to make big power down the road so i wanted to port my engine right now while i have the engine out.It is gonna be a daily driver so i was wondering if i should do a streetport or a bridgeport.I heard you shouldnt get a bridgeport for a daily driver because of the lumpy idle and the low end power loss but i wanted to see what you guys thought.Also if i port the engine im sure i'll have to upgrade the fuel system,what needs to be done.Any info will help Thanks!

adam c

iTrader: (2)

Get the street port. Bridge port won't be very nice as a daily driver.

norberts94fd

yeah thats what i was thinking.I just love the way bridgeports sound

mr_ouija

Bridgeports sound mean and all, but unless you're dedicated you won't want to daily drive one. There are people who do it, but it's not recommended. I'm looking at going down the bridgeport road myself, but I'll have another car as a daily driver, and the FD will be more of a weekend fun car. I figure I can manage a few days a week.

Upgrayedd

iTrader: (1)

Bridgeports aren't as bad as I've heard. One of the guys who does work on my car has a bridgeported RX-7 and it wasn't as laggy or lumpy as people make them sound. However, he drives his once every couple of months... Usually only for HIN or when he moves into a new house.... But let me tell you with BNR stage 3's and a brideport running 18psi I'd be scared to drive it every day!!! I'll be doing a bridgeport once I start makin money again and my RX7 is no longer my daily driver....

mr_ouija

I've heard they aren't that bad as well. The guy I will have do my porting runs a 2nd gen 6-port with the ports about as big as he can get without a bridge, and he loves it. I figure when I don't depend on driving my FD everyday, I'll easily be able to deal with whatever may come with the bridgeport. I'll hopefully have fuel system done and ready to single turbo by the time I pull my motor for the rebuild/port job, so I can kill 2 birds with one stone. That's my goal anyhow...

Upgrayedd

iTrader: (1)

That's always the best part... The mods needed to support your mods!!! lol

mr_ouija

Yep. Looking at modded primary and KGParts secondary rail, with 850 primaries and 1600 secondaries, plus FPR. Though, I don't need them quite yet, I'm getting there.

Upgrayedd

iTrader: (1)

Yea I hear ya... It always helps to tally and make a list though. That way nothing is lacking when it's ready to go in! No more waiting! No more withdrawals!! O how I long for that day myself!!!

rynberg

Stick with a milder streetport. You'll have trouble passing smog with a big streetport and won't have a chance at all with any more agressive porting. Not to mention that a streetport will make good power to redline with no real reduction in drivability. The same cannot be said of more aggressive porting. To take advantage of a bridgeport, nearly every aspect of the motor/driveline will need to be upgraded, including the use of a turbo large enough to not choke at 8k+ rpm.

Upgrayedd

iTrader: (1)

Really..... It's possible to pass emissions with a mild port????


BNR stage 3's work fine for a bridgeport on my friend's car..... without choking. However I'm not sure how aggressive the bridgeport is....

t-von

iTrader: (8)

I'm surprised how lacking the info is on this thread about bridgeports. There's more than one bridge to consider.

If you want a streetable bridge, go with a half bridge. This is a bridge of only the secondary ports and not the primary. You guys need to understand that the stock throttle body regulates the air flow between the primary and secondary ports. At very light throttle all the air is flowing through the primary ports. The secondary throttle port plates are still shut and can also be adjusted to open even later than normal.

If your primary ports are kept stock (less overlap) this makes the engine more streetable due to higher intake velocity. Higher velocity allows the combustion chamber to fill more quickly and efficiently which in turn puts more fuel/air mixture into the chamber to be burned. More fuel/air down low means more bang which means more force again the rotating e-shaft. If you increase the overlap of the primary ports, all your doing is allowing some of the unburned fuel/air mixture to exit the exhaust which causes poorer emissions and less torque down low. A bridge port of the secondaries won't effect emissions testing either unless too much throttle is applied making the secondary throttle plates open. Overall keeping the primary ports stock with no additional overlap down low is how you keep the engine streetable. IMO there's no reason at all to port the primary ports on a street driven car.

norberts94fd

yeah i think im just gonna go with a streetport.If i get a streetport will i have to upgrade my fuel system?(bigger fuel pump and injectors)

black93RX7

t-von: good post, Im about to port my new motor and will leave the primary ports almost stock while doing a large street port to my secondaries.

It all depends on what you will use your car for. My roomate however, has a bridgeported n/a that actually drives really nice, but his powerband is much higher in the rpm range.

norberts94fd: its always a good idea to upgrade your fuel system, are you planning on running more boost?

rynberg

I disagree! There's no point in spending the money and dealing with the hassles of it unless you NEED to. You would also need a standalone ecu to control the different injectors.

norberts94fd: You do not need to upgrade the fuel system to run that streetport. You will only need to upgrade when running above 13 psi.

BTW, I don't think some of you realized the state of this guy's car.....running a bridgeported motor on the stock ecu? Not a good idea IMO.

norberts94fd

i dont plan on running any more boost right now.All i have is a downpipe, intake, and a cat back.I think i can keep the fuel system stock for now on a streetport since all my money is going for the rebuild .

Snotcycle

wise decision, you live in CA. you'll get your car towed the first day out on the street with a bridgeport, go to the shop thats porting the motor and see if they have a bridgeported car, you'll understand the imposibility of a bridgeport on the street once you see/hear one of them in person, it sounds like a wheezing old man at idle and a ******* TIE FIGHTER at WOT

3rd and final 7

iTrader: (9)

drivabilty is in the user if you can handle the loud brap brap brap brap which is a wonderful sound! ive heard a blown bridge and its unbeleivble i nut my pants! you also got to look at how big or small your bridge is going to be the smaller the bridge the more prone it is to cracking! if you go with bigger bridge it will be more reliable! another thing that you got to look at is the idle your going to have to tune it at about 1100 -1500 rpms and thats one of the reasons that they eat more gas!
as t-von said a half bridge is a good way to go also, you still get the benfeits of a bridge w/o out all the down falls ie: poor idle, crapy low end, gas consumption.