dpf22

Oh yeah: I realize that the ramp isn't the only part of the filling that would need to be addressed. By filling I was imagining making a choke like factory, but the ability to change it makes sense in planning for a particular rpm range when velocity is associated..... At least in my head. I could be way off base, but it is an idea worth discussing anyway.

sen2two

iTrader: (10)

many people have done this. I have done this also.

You can use cheap JB weld. A better choice is Devcon. Same stuff to fill the coolant area when doing a PP or J- bridge.

dpf22

Thanks for that info. I was thinking devcon would come up as an option. In which case I know of something recommended as a substitute that may be better. Have to ask the person who originally told me though. can't remember the name or who sells it.

dpf22

Discussion on pro's and con's of such modification to ports? I've never even seen a picture of a filled port myself. Visual aid is great, though I'm not surprised that it has been kept somewhat secret. Anyone else with more info?

anthonywe

Okay I have just read all of this. I'm planning of doing a bridge port or half bridge or something like that? May I know what the difference are exactly? and another thing if it is a good idea as I'm using this car as a daily drive. The main main reason I want to do this is not only for the power but for the (pra pra pra) sound. It might sound stupid but yeah that just what I love more then any thing. I'm planning of doing a rebuild on the motor while doing this port. Well I'm having some one that knows about it doing it since I would not be able to do it myself. any suggestion or advise ? thank you in advan

anthonywe

Oh I think this is also important for you guys to know before answering I have a second generation 1987 with a turbo. I have no clue which turbo I think it is the stock one.

dpf22

Wow..... This thread died.

DR_Knight

iTrader: (23)

how much money are you willing to spend? im asking this because if you're going to half-bridge o bridgeport your motor i believe your turbo is wayyyy too small. and then you're going to need to look into fuelinjection... so you'll need to upgrade your fuel injectors. and then you'll need to look into electronics, and EMS's get pricey. and then... you'll need to look into getting awideband and street tuning it yourself and then bring it to a shop and getting it tune.

a half-bridge turbo is not going to come cheap, but if you have the financial means to pay for it.... then go right ahead but jut be aware of the expenses you might run into.

i was also considering doing a half-bridge. but this would mean i would have to sell my t04e and upgrade to a much larger turbo... preferrably ball bearing. then i'd want to upgade my fuel system to upgraded SS lines with an aftermarket FPR and fuel rails. i already have the haltech, and 1600cc secondaries and rotors milled for 3mm apex seals so i've covered most of the expenses. but still... there's alot of money needed to complete the half-bridgeport build and plus... I think police officers might give me a double look and pull me over if they heard the "brap brap brapp" sound coming from my car.

so i started thinking realistically what would fit my financial situation and what i wuld want front the car... and i'm doing a mild streetport on a s5 t2 block with a mild streetport to the exhaust port and intake ports. but i still think bridgeports are the way to go if you have the finances to afford them.

anthonywe

wow that is good information to know, well I don't know exactly what I'm going to spend. I'm only 20 years old that lives with my parents but I work and make around $1500 a month and I now have a small business and yeah I can kinda spent for a couple of months all what I get into the car. I'm thinking of doing a rebild on the engine since it needs it and then at the same time doing the half bridge porting. I can see that you know way more then me about all this. Could you maybe help me like telling me which turbo I would need to use and how much it cost and the same with the other things that I would need to change? for example the fuelinjector. and if you know a web site that I can find and see these things would be amazing. And is it worth it doing this with the motor I mean like is it going to break fast? I know it depends on how you treat It but I'm planning on having it serviced every 2 months and not planning of burning out everyday and so..
If you go to this link or copy and paste it in your web brouwser you can see some pictures of the car (http://www.cardomain.com/ride/3346396)
and yeah sorry for my bad spelling but I think it is good enough:p.
Thank you for helping me and with all the advice I will also be asking the person that will do the bridge port for me about the turbo and fuel injector.

Thank you for your time and effort in advance and I will keep you updated on the car if you wish to be updated

Anthony

sen2two

iTrader: (10)

before you make any decision...

read much more information. In time you'll be able to answer your own questions. Turbo choices vary greatly, and so do port styles. Some are preference by the person. while one person may believe a very large street port is king. some may believe the bridge (or other port styles) will be better. Some might believe a Garrett turbo will be better, some might like Turbonetics...

Its preference a lot of time...

what are your power goals?

anthonywe

that's the thing I'm not really looking into getting as much power as possible. I'm just looking into the sound of (brap brap brap). The power has to be normal or decent but the sound is the thing that I really love and look into having. I do know it cuts your power at the first rpm and you get more power from 4500 to around 9000 and they say bridge port gives you like 50% extra power. I did read allot but not about the turbo changing and the electronics or something like that. So In a way maybe I don't even have to change the turbo since I'm not looking into getting as much power that I can from the motor. I want some power and the brap brap brap and still want to try to keep the car a daily drive or at least something that I will use often. so what advice do you have for me for this?
thanks

anthonywe

And yeah I also kinda need to make a decision in this week or next one sice I will have the motor rebuild end of this month and Would want it ported at the same time then I will get a much better price.

dpf22

in the interest of keeping cost and complexity down, I suggest sticking with a stock rebuilt and concentrating on the turbo system. Things add up quite quickly when building so I'd do a lot more research and maybe do a basic budget breakdown before you start. Plan to spend 20-50% more than you expect to get it done.

When you port a motor, you increase the need for aftermarket injection. (not that I care much for the stock system to begin with) The more mods you use on the stock system, the more you lower both the capacity for power, and reliability.

anthonywe

what exactly do you mean by the more mods you use on the stock system? the only thing that is motivating me to rebuild the engine and spend the money to do it is to get the brap brap sound. Cause if not I would prefer removing the rotary sell the car or just put a v8 in the car what I was first panning to do when I bought the car when the motor was still working. around how much would the injection cost? I would not really mind spending around $4000 for this or maybe $5000. and maybe in a couple of months even more. but I would love to understand like the part that you said stock system. What exactly would have to be changed to not make it a stock system? I did read allot these 2 week not only on this forum but also on google all about porting and what kind and how it looks like and what it changes to the motor and the power and all that. I really like this forum it really helps allot. And at the same time I'm asking these question I'm also searching and reading.
Thank you for helping me with all this

rotayt

with bridge porting you need to be carefull you dont go in to the corner seal passing area, if you go in too far then your plates are no good! with bridge porting you are putting more fuel in to the engine so upgrading your fuel system i wuld do, even a computer! well i dnt no how far you want to go but i gotta say that brap brap sound is dam fine!

sen2two

iTrader: (10)

if your just looking for the sound not power. you dont need a real bridge port. instead of porting the hole bridge out, just have the guy rebuilding the motor drill 2-3 holes where he would put the bridge, and just not port anything else. this will give you the sound without all the complications.

you could also sell the turbo stuff and put some headers one. also trade the TII rotors for S5 NA rotors (9.7 CR)... this is not something i would suggest. but it seems like this would suit your needs or wants.

anthonywe

Oh cool or tat infornation.. I will be lookinh into it with the guy that would do it for me. I will update here when i know more or when i have more questions.. Thanks...

TonyD89

iTrader: (10)

Yes it did.

Back to topic. I'm interested in iceblues statement of later closing/RPM. I've often heard it stated that opening earlier has more gains than closing later. Thoughts? I'm in the process of rebuild and I'm weighing these things out now. I want a street car that hasn't had the bottom totally knocked out of it but still pulls to, I don't know, 8500, or so.

S5 Turbo engine with 9.7 rotors to be run NA. Starting off with factory TII manifold.

I'm thinking things like:

Trailing side seal safe Street Port. But I now have questions about raising the port to much because of what iceblue said. I under stand what is meant by the D shaped runner. I like the straight in ones but they lack a scissor angle. I think that could be done with a radius. Larger at one end than the other.

Rotor phasing. Not crazy like some pics you see but even a *45 angle opens a bit further.

How about in conjuction with street port described above?

Then there's the Half-Bridge with said street port.

What about a Half-Bridge, said street port, and phased primaries?


I guess I'm just rotary dreaming again.

Monkman33

iTrader: (28)

I am interested to know what port timing/shape will give the most power in the low-mid rpm range. (autocross application)

Stock?

Gorilla RE

iTrader: (1)

Stock port, stock sequentials, 4.3:1-4.77:1 final drive plus all the bolt ons and tire/susp setup etc. Best autoX setup possible.

If you have the engine down and are already building it, then the only changes I'd recommend are that of smoothing (rounding) the closing edge of the port along with a slight reshape of the bowl and a good under/thinning cut of the eyebrow. If you are to do any actual port timing changes, make them to the opening side of the port only. I recommend about 1.5-3mm earlier.

-J

muibubbles

iTrader: (36)

can you upgrade ports? like... a large street port into a hbp?

my86rx7

iTrader: (10)

wow this is a very thorough thread. Thanks RXHeaven for all the spec sheets and pictures. This definitely is helping on my research for a project i am contemplating.

rotaryinspired

iTrader: (3)

Alot of people on the street would be much happier w/ this setup than the huge ports they do. Take note.