When i get my an engine rebuild, probably from pineapple racing i am gonna get it streetported. WHen i emailed Rob, he said that the large street port can add 100 hp. If i do get the large street port will it already have the 100hp difference, or is this only achieved with other mods. Also with the large streetport, is it unsafe to run it with a stock ECU or is the 100hp only achieved when upping the boost.

 

These are questions that Rob can answer in detail.

You will see a much greater power increase if you have extensive mods vs. if you had a completely stock car. The ports will help with flow, but they can't really reach full capacity when there are other things (stock exhaust system) creating a bottleneck.

It is definitely not recomended to run the kind of power you will be capable of without either a re-chipped ECU or a stand alone system. Try searching for street port, you will most likely find answers better than mine

kyle

 

i came across this pic so id put it up. its of a ported engine

 

whats the price difference in rebuilding with a ported vs normal?

 

ported engine "breath" easier allowing more HP

 

more power man!!!!!!!!!!!!!!!!!!! the porting is like changing a cam in a piston engine. . . and opening up the ports of course.

paul

 

the bigger the port job...the less low end response you will retain.

get a mild streetport if you want to drive it daily...yer looking at a 25-35hp increase.

a streetport simply allows for more flow..air and fuel and exhaust if i am saying that right.

it will move your power band higher and will make the car pull and pull and pull....however...this happens at the expense of some low end torque.

a stock ecu can not adjust for the streetport...you would have to rechip it and set a new fuel curve...best bet is to get a pfc or a haltech and have it tuned properly.

a streetport and exhaust and intake and a couple more lbs of boost is night and day difference over stock if you have an ecu to get it the fuel.

an intercooler is a good mod to have with that setup...among other things.


anything bigger port wise is for the track in my opinion...afterall you cant use nitrous in daily driving. and it sucks to drive on the street with no low end.

driving across the desert might be another story.


jason

 

no matter how large you get, you won't get 100hp w/o more boost. you'd be hard pressed to get that w/ the stock twins, but you could do that w/ a single.

 

does a street port increase boost?

 

no.

 

You can get lots of boost out of stock turbos. I know a guy with a 94 FD and he has jacked up boost on his and it works fine. He said he pusing 20psi. He also works @rx7 specialties so he has done other things to his ride as well.

 

20psi on stock turbos? How long do the turbos last him, 1 pair a month?

 

Here is a shot of the porting I am doing on my engine now.

The rest can be seen on nopistons.

 

Holy crap, is that even possible on the stock twins? I don't know much about recommended boost levels, but from what I've learned on this board, 20 psi is WAY past the "danger level" for the twins.

 

He must have a different MAP sensor, because the stock one can only read to 1 bar, 20psi would be nice and with the twins if still running seq., id like to hear that, i got my turbines clipped on the stock twins and when that secondary opens up it sounds like OMG, armageddon....

 

isnt it the same thing as matching the ports on the intake manifold to the ones on the engine?

 

That"s PORT MATCHING or also called Gasket Matching (when you open the Manifold & Ports to exactly match the Gaskets - regular PORTING is opening the ports in the HOUSING to alter Port Timing & Area.

 

Funny, on the Dynojet 248 the stock turbo's ran out of their efficiency range at approx 13.5 psi. This meant no more added performance. The only way to make stocks run better at 20 psi would be to change out the internals. Who would do that to the HT-12 's?

 

Your friend needs to put down the crack pipe. He is not running 20 psi on STOCK twins. First off they would last about a month at that psi, and second they wouldn't be efficient at all. You would make no significatn power increase after about 15 or so psi.

I had my healthy stockers running at about 15 psi for MAYBE a month and a half before the seals went.

 

Oooopps, guess I shoulda finished reading the thread before I posted! Sorry for the double info!

 

not necessarily, you have to understand what backpressure does to these turbos. w/ a complete exhaust- dp,mp,cb, the turbos can make more power at high boost, due to the lack of backpressure. if the exhaust has too much backpressure it'll start producing too much heat and won't make power.

 

You can put larger compressor wheels in the stock snails for much more power..and lot's of people have done this. I think most people agree that the stockers shouldn't go past 15 psi with any amount of mods unless with some race gas and for 1 or 2 track runs. But there are a lot of people running stock twins at 15 psi for a while without problems......yet

 

The stock US spec twins were designed for 9.1 psi operation. The Japan spec twins ('99 and later) were designed for 10.8 psi operatoin...

 

i posted a link in teh loung about porting.
http://members.optushome.com.au/rotary13b/porting.html

No one seem Interested. Hope it helps.

 

Nice explanation of the different types of port jobs!