Jeezus

iTrader: (4)

It all depends on how big you bridge. You can lose most, some, or none. Generally you lose a little bit.

Kill No Cone

iTrader: (6)

In regard to port size...it depends on who made the porting templates.
I spoke with the techs at RB and was told that the SP is the same size as the main port of their bridge port template. But, that when you go to the larger J ports that the main ports of those templates are slightly smaller that the main port of their SP and bridge.

Also Pineapple Racing does a "rally port" which is a SP that undercuts the corner seal by a few mm. It is a massive SP, but they will not make a porting template available.

I think that Wacky Racer has a massive SP that undercuts the corner seals, maybe he will share his templates?

black79

so judging by the pics of the template that I have available to me what do you guys think this will do to my bottom end? Will it make me lose most some or none?

djessence

EDIT: **** i totally didnt realize i wasnt on the second page.



it will cut your bottom end yes, if you do the bridgeport it will be a decent amount of low end loss, thats what bridgeports do. I'd suggest maybe reading more(cuz more knowledge is a good thing for anyone) on what exactly porting does and what happens with the different ports.

I had thought i read somewhere the different ports, the # of degrees the ports were opening closing with the different types and severities but maybe someone had just said it in a thread....

rotpower

I was using the "date" description figuratively. Back then, dates were on my radar.

Driveability at low speed is mainly affected by the intake overlap of the bridge and steady throttle applictions where you are giving it small amounts of fuel. Like driving through a neighborhood at 30-40 mph in 4th gear. It is harder to do with a bridgeport because the car tends to buck when feathering the gas in this type of low speed scenario. This is the main drawback. Not necessarily acceleration.

There really isn't an acceleration issue IMO. You can still accelerate fine at low revs. But you either need to be accelerating, or up in the revs higher to avoid the lopping buck of the drive train when it is idling along below 2000rpm. What this means is you may be driving around in 3rd gear in local neighborhoods instead of 4th in order to keep the revs up out of the range where the car tends to buck. In 4th it may be a pain in the ***, so you downshift to third. Or, downshift 5th to 4th. It wasn't really a big deal for me.

One thing I did notice after my post was that you are using a turbo. I do not know how this will affect low speed operation in your case. I was driving a free breathing, normally aspirated car that dumped a lot of fuel through a carburetor. A single stage turbo could have lag issues that are compounded by the bridgeport's propensity to favor revs over 2,000 without bucking. I really can't give you advice here as to the affect of the turbo.

To me, if it is not a daily driver and you want a car that runs hard, go with the bridge. As long as you realize it will be for that purpose and not used to carry the family out to dinner and shopping for groceries.

On a secondary note, I did notice a lot of wear marks on your side housings. Not sure if you are going to resurface them. You may be on a budget. I really don't know your situation. I bring this up because a bridgeport gives you the most benefit from a FULLY built engine. This means spending the money to receive the full benefit of the bridge. It likes the revs! And makes the power way up there. If you give it the fuel and have the exhaust it can rev very high and pull through the entire upper range. It will put a grin on your face. The downside is the expense of making a motor that is appropriate for this type of hard use. If I were building it, I would go with new rotor housings, buy the appropriate apex seals for high rev/boost scenarios, do the cooling jacket mods, invest in an ignition system, bump up the oil pressure, hardened staionary gears and rotor pinning, FOR SURE balance the entire engine (clutch, flywheel and rotating assemblies), make certain you have an intercooler that is appropriate, and not spike the boost too high to avoid detonation. Detonation will kill your motor dead. These are just the minimum things I would do.

Otherwise, if you don't decide to invest in the full enchilada, I would just live with a large street port.

This is just my opinion from experience. Some folks may have other opinions and maybe they will chime in.

Hope that's helpful,

Don

black79

Hey thanks a lot Don for all the info. I think I have decided to just say with the samll bit of porting that I have one so far. I guess my goal is to have about 250bhp to the wheels so doing all of this extra porting (if any at all) is not really going to be worth it. I really like a lot of the aspects of the bridgeport, but I think I just want to keep the engine a little more reliable and more drivable for cruising. I am going to be running this car on a megasquirt as well, so what other things will I need to do to acheive my 250bhp goal?

djessence

a big ****** turbo

Maybe i missed some other mods you are doing but you are talking about 150% increase in power to the wheels. with a small port. Are we serious? The TII guys with streetport and other upgrades are only just surpassing that.

Seriously IMO you need some research. You would want to do some serious upgrades on brakes, tires exhaust. Like holy.

black79

yea I know that only doing a small port will not get me to that increase, I was asking what other mods people would suggest to me to achieve this goal. Thanks djessence for that little blurb of yours but it was absolutely no help at all. If anyone here has any more advice that would be helpful please let me know as a lot of you had some really good points on this topic so far. I know that people have made a lot more power then 250bhp on stock ports so its not like it is impossible. I will be upgrading from the stock turbo eventually, but I want to now what I need to do now to support, and get the most out of a bigger turbo down the road.

djessence

Well i hate to break it to you, as far as i can see you havent actually told us what kind of motor this is. Therefore i assumed 12A.
EDIT: i just went through it and figured it out its a 13B only from the fact that the coolant jackets are on the irons and not the housing.......... And that being said in your profile it says you have an SA, so what EXACTLY do you have

Saying you are going to upgrade from a stock turbo suggests you are running a turbo motor. Give us some more info if you want some advice. What mods do you already have to what motor?

And my research comment still holds true. There is so much info on this its not even funny.

But i will try and be helpful with absolutely no knowledge on what kind of setup you have. Assuming its a turbo:

Free Flowing Exhaust. Alot of guys running between 2.5 and 3" exhaust. This is one of the most important aspects of a turbo setup. If you havent already get rid of all kind of emissions crap like cats and air pump etc.
Some form of performance header. Again not sure what is available for your setup cuz frankly i dont know what it is

Is it fuel injected or carberated. If its fuel injected, standalone EMS allows you to get better fuel management, larger injectors eventually into larger turbos and power. Stock ECU has its limitations (that being said at one point steve84gstii had 300hp on a smog legal TII FB, not sure what mods he was running though).

If you are not upgrading stock turbo, i would suggest a slightly bigger port. Even for down the road, a bigger turbo will need more breathability depending on the boost levels so a slightly larger (like medium SP) will help as well.

black79

Actually djessense i did actually tell everyone what engine I was using. I know that there is a search button, but I was getting a lot of good info from the people that were responding to this post, so I thought I would try to get some of their opinions, which actually included you. I apprectiate the info that you did give to me though so thank you. As for the car, yes it is an SA that I am going to be putting this engine into, and as I stated before I will be using a megasquirt to run it. I am also planning to upgrade the injectors as well, can anyone tell me what size injectors I should buy for what my plans are?

djessence

Well i apologize then. Clearly i missed that key post up in this thread.

Neighbor running a S4 SP TII had 800 cc secondaries in it, seemed to run pretty good, and just upgraded to 1600cc injectors(again secondaries) becuase i believe he is getting a bigger turbo pretty quick here. Quasi helpful...(hes currently running 252rwhp)

black79

so should I leave the primarys alone, or should i make those bigger as well?
Also, at what size are the secondarys too big for a stock turbo? I am planning on runnig a walbro as well.

Hyper4mance2k

iTrader: (40)

The ports I posted are Brian's from BDC motorsports. all my port work can be seen on nopistons. we both use a dremmel.

Rotary Alx

I would just like to give the Thumbs up to mr ROTAPOWER , realy good sharing , of the real life pro`s and cons , of a bridgport daily / date driver :-) !!

Thanks for taking time to share , and being so open minded as well .

Keep it up !

Best regards

Alex .