Sesshoumaru

iTrader: (1)

I ported my stock turbos.

They turned out quite nice. Compared to the S5 wastegates they are massive and they just laught at the s4's.

I've ported both s4 and s5 wastegaste and ran them. Both instances i had open exhaust. I was unable to copmletely defeat the boost creap demon but battled it to resonable levels.

I have two main worries with the s6 unit.

Will this be enough for stock levels with md, dp, cb.

Under slow throttle acceleration until full throttle in my S5 it would creap and seemed as the wastegate wouldn't open with a boost controller (but would on wot fast). My theory was that since i had to port to the limits of the puck that perhaps the wastegate couldn't open due to the suction.

I don't want to port over the puck b/c that would increase lag but i made sure not to extend beyond the puck's region. I'm not a fan of replacing the puck either as the s6 units look like there's no more room.

will i accomplish my mission in remaining in stock levels?

rynberg

Every car is different. Without an intake on there, you probably wouldn't have experienced creep anyway, but if it's ported you shouldn't have any problems with creep. Spiking may be a different story. What boost controller are you using?

SleepR1

Really don't understand what you are porting on the turbos? Are you enlarging an opening? What are S4, S5, S6? What pucks? I'm lost...

Sesshoumaru

iTrader: (1)

i'm porting the wastegates. On the FD i'm not going to run a boost controller. That was only on my s5 for a short time.


Series 4 is 86-88 FC
Series 5 is 89-92 FC
Series 6 is 92-95 FD

My goal is stock boost levels (thus no computer yet).

The puck is the round thing that covers up the hole that's connected to the wastegate door and that's connected the wastegate actuator via a rod.

I just make the hole larger so it can flow more exhaust thus reducing boost creep.

I know I greatly increased the air flow through the ports but i was wondering how much added flow is needed. It almost looked better than my street port on my S4 motor . I didn't think cast iron could shine like that.....atleast for now......


The intake is yet to be decided but will be free flowing and i have a 3 in. md, dp , and a RB cat back.

i'll be rebuilding my engine soon too so i'm debating on a street port since the templates are the same as the s4 & S5 models.

I wonder if they could hold off that...............

rynberg

You cannot boost over 10 psi with the stock ecu. You will NEED a boost controller if you are installing all of those mods in order to maintain the stock boost of 10 psi.

Once you streetport the engine, you will also need an aftermarket ecu, the Pettit ecu at a minimum, but preferably a standalone like the Apexi PFC. This will also make it much safer to run a midpipe.

Sesshoumaru

iTrader: (1)

I've always stated that i want to maintain stock levels.

Boost controllers can only raise boost and that's what i don't need.

I see no reason a FD can't use a MD, DP if you maintain 10psi.

rynberg

You're not getting it.

The wastegate on the FD opens at 7 psi without any controlling factors. The stock ecu blindly opens it at a set duty cycle to try to maintain 10 psi. When you open up the intake and exhaust, the stock ecu will not modify the behaviour of the wastegate. Therefore, you will boost over 10 psi. With a boost controller, you will be able to lower the boost levels back down to 10 psi (actually all the way down to 7 psi if you want...).

Sesshoumaru

iTrader: (1)

oh?

so the FD doesn't use pressure but a duty cycle to control the wastegates..........how troublesome...

So by installing a boost controller your bypassing the elcectronic control.

damn....i think the s5's had something stupid like that

rynberg

An electronic boost controller takes over the function of the stock wastegate solenoid to operate the wastegate. A manual controller works by varying the amount of pressure the wastegate actuator is seeing.

Go through the info here to better understand it:

http://www.autosportracetech.com/RX-7/rx7stuff.htm

http://www.rx7turboturbo.com/robrobi...boost_note.htm

You can also run a search on Profec B installs on the forum.

SleepR1

IMHO, the best way to go, is save your money and buy the Apexi Power FC. You should be able to effectively control boost with the Power FC. It works with user-adjustable the base duty cycles for the precontrol and wastegate actuators. The Power FC allows you to enrich your fuel mixture to compensate for the freer exhaust and intake flows of your modifications for more horsepower and safe-running.