Alak

iTrader: (9)

I tried to wade through the chest deep postings from the search engine and couldn't really find any specific answers.

Thinking of going with a medium-large street port with agressive exhaust porting. Wondering where most guys get their templates, and if you guys port the primaries and secondaries to match, or go with a smaller primary setup.

I have agressively (race ported) exhaust ports right now with bone stock intake ports. Its just how I got the housings, it was not pre-planned.


I thought about a half-bridge, but I drive the car too much.

FC3Sdrift

iTrader: (5)

I have pineapple medium streetport and ep2a exhaust port
my best 1/4 mile et was 11.42@122 with a s5 hybrid turbo stock exhaust manifold.

Aaron Cake

iTrader: (1)

What is the use for the car, how much power do you want to make, which turbo are you going to go with?

A lot can be accomplished on stock ports. If you are going for reasonable power levels (under 350HP) then a basic street port job works quite well and retains the drivability. Use the Mazdatrix 6 port primaries on the primaries, the Racing Beat street turbo on the secondaries, and the RB street turbo exhaust on the exhaust. Results in a wonderful driving car that doesn't lose any low end/midrange.

Now since your exhausts are already ported, that can change things somewhat. Do you know what the timings are? Or have a stock ported housing to compare to? "Race" ported exhausts typically describe a huge exhaust port moved well up and down, designed for high RPM high overlap ports like bridge. Might not be suitable for use in another scenario.

Alak

iTrader: (9)

I'll be going with a pair of brand new rotor housings. To fire it up in the spring I'll be running an s5 hybrid comparable to a bnr stage 3 closer to a stage 4. Claimed whp from the last user was 325ish to the wheels on an S5 engine with agressive porting (was a race car). My ultimate goal is to move to a considerably larger turbo, such as a garret T04z. I'd like to try for something along the lines of the other side of 400 or so to the wheels. The car is street driven. To be correct its all highway miles. I drive it to work in the summer and its parked while I'm working where-ever and sometimes driven and street dragged when I'm at home base working. Also looking for long road trips (california, florida).

R.P.M.

iTrader: (3)

Dont go crazy, infact reasonably stock ports work perfectly fine.

I built an FD engine (ok different from an FC T2 but....) with an HKS T04Z, I left the closing port timing stock and just opened up the opening timing as far as the sideseals would let me and of corse cleaned up all the casting in the intake runner. I leave the intake runner rough on purpose too, polishing it just give fuel a chance to pool up and not mix correctly with the incoming air, especially at idle.
The exhaust ports on this engine were hardly touched, if I remember right I didnt change the port timing at all.
464whp on 91 pump fuel @ 15psi.

You should easily hit 400whp on a T04Z with a T2 block.

Alak

iTrader: (9)

I remember reading a post somewhere around here a couple months ago of a fella with a huge turbo on stock S4 ports that made over 400whp. I think it was a T51R (which was my other choice but a bit overkill maybe). What are peoples thoughts on porting the primaries and secondaries to match? I was hoping for a little burble at idle. I also read about another fella who recommended using a bridge port template to port for a street port (just excluding the use of the bridge).

A few of the tuners around here like to open the exhaust ports right up and leave the intake ports relatively stock, and basically do what you described joe and increase the port opening, but leave the closing stock.

vintage

you can order porting templates form Porting Templates and they also have a porting video so you are able to see how it properly done and the video seems to be very well fimmed. I hope to have my copy in a month or so

Alak

iTrader: (9)

The pineapple racing ones look pretty horny. Templates and a video sounds like a good time. Geez Im startin to sound like misterstyx.

thewird

iTrader: (8)

I like R.P.M.'s thought process on the exhaust port. By not going crazy, you keep the torque up by letting the exhaust do work. Only concern is backpressure/heat but that's why this stuff is really application dependent.

People think a street port is a given port size but the reality is as long as you touch the port, its considered a street port but there is so much range to play with it depending on what you want. I sometimes laugh when I see "street ports" pulling ~16-17 inches of vacuum @ 900 RPM for cars im tuning.

thewird

misterstyx69

iTrader: (142)

Just got back from rubbing my long stud with vaseline..you rang?
Porting?..sounds flatuent!.Brapp!

Alak

iTrader: (9)

My car currently pulls 8 inches of vacuum at a 650 idle haha. I get about 12-15 at 900. Reason is the housings I'm using have a distinct wear groove for 2 piece apex seal in the rotor housings. I was in a pinch and needed the thing to run, so I just literally slapped the motor together with what I could find. Reused all the seals, used slightly used RA classic apex seals. Car has ran really good and I flogged it all summer. But now its time to do a proper build and make some ponies.

Alak

iTrader: (9)

Looking at a GT4088 turbo. Can't seem to find any quality manifolds though, probably go with an HKS cast and tial 44 or 46 wastegate.

Think I should be able to push that turbo fairly good if I go for a bit of port work on the secondaries, a fair amount on the primaires and open the exhaust more. Going to stud the engine I think.

Aaron Cake

iTrader: (1)

With a 4088R, I'd definitely recommend a good size secondary street port, and move the exhausts down a bit to aid in spool. Great turbo though. Stick with the .96 turbine housing on anything smaller than a bridge.

FC3Sdrift

iTrader: (5)

I made 361whp 309ft-lbs with S5 TII engine,cleaned up stock ports, S5 hybrid turbo 15-16psi surge then drop too 13-14 at redline, I couldnt go WOT till 3500rpm , the engine was worn with a couple broken corner seals
havent went back to the dyno since i streetported it and got megasquirt but its faster

253rotary

iTrader: (3)

I love this threads so much knowledge out there

Alak

iTrader: (9)

A half-bridge might be fun. Well, it will be fun. But I want the motor to last.

I think I'll probably go with pineapple racing templates. I think what I might do is use a bridge template on the secondaries, only I wont cut the bridge. Then if I change my mind, I can do it.

Aaron Cake

iTrader: (1)

There's no reason why a bridgeported engine won't last, but you'll be stuck with horrible fuel economy and an engine that is a lot harder to tune.

Alak

iTrader: (9)

I hear you there. Fuel economy isn't totally a concern, just the annoyance of frequently filling up, plus I premix. The bulk of the tuning will be done by a very good rotary tuner in calgary while I learn enough to do it myself.

What about a smaller turbo like a GT3582r? Thoughts on that? Seems to provide good response and midrange at a 400whp level.

Alak

iTrader: (9)

I thought I would bump this for further discussion. I'm getting close to assembling the engine and need more thoughts.

I'm getting close to building this engine and I'm still not fully decided on what to do. My thoughts were with buying a pineapple racing bridge port template, and not incorporating the bridge portion into it (but I can later if I'm looking for more). I'd use the template as a guideline to myself to judge what my needs are visually to the port. And using an EP2A Template for the exhaust as it doesn't look so radical. I'm thinking to start with this and see what it does, and tinker/tune from there. I'm not exactly breaking new ground with the 13B-T here lol. Car turned 25 this year so its officially old school.

================

Turbocharger is still undecided as its mainly a budget item. Basically all I need at this point is a turbo and standalone to complete this build. I'm looking at a haltech sprint RE. I have an HKS cast manifold and 46mm TIAL wastegate. S4 Turbo rotors. I will be using S5 manifolds, and I have myself a corksport front mount with modified/upgraded piping. 750cc Primaries, and 1680cc secondaries. Aeromotive 340 pump and regulator to follow. I have my ACT extreme clutch and pressure plate in good shape. Ditched my power steering and I dont have A/C. Properly Deleting my leaking ABS pump. Car is coming along and I have lots of boxes of parts to install.

84stock

iTrader: (5)

Hard to beat the sound of a half bridge!!

shortbridge.mp4 Video by 84stock | Photobucket

Alak

iTrader: (9)

I don't really feel like sitting at a stop light with my car shaking away at over 1000rpm. They sound good, but you still have to drive the thing.

Max is selling that turbo. Actually hes selling a pile of turbos. Nothing I want though.

Aaron Cake

iTrader: (1)

You're going to have to either decide on a turbo and port the engine with respect to it, or decide on a port and choose the turbo to match. The port you describe would be a decently large street port, so the 35R would be a good choice. 1.06 T4 flanged T3 housing (35R is a T3 sized turbine unless you customize).

Alak

iTrader: (9)

I'll figure something out in the next few weeks. I was fortunate to buy a blown S5T parts engine for some core parts, and found an ACT prolite flywheel. Made my money back and then some!

I found a great deal on the forum for a T04R turbo. Couple fellas here run them with a large street port and get positive results. It seems to be between a T04R and a GT35R. I havent really had time to compare the two in detail yet. I think I will do that later tonight. In any case Im going to start working on a build thread for my self mainly to keep track of what I have done.