Hi guys,

Just thought I'd get some last minute perspective on things. I'm heading for a dyno session with my FD this weekend, supposedly a good tuner with these engines but anyway.

I'm still stuck with the PFC as a tuning device, so I know it has its limitations. The car has ID1000 pri and ID2000 sec injectors, Twin power with stock trailing coils for the leading plugs (I'm using some rare leading only rotor housings). It has a Greddy T88 34D turbo on it and a homebuilt water injection system that pumps out around 200cc at 1 bar boost (that's how far I have road-mapped it already) and gradually goes up to about 500cc at 1.5 bar and from there it stays at 500cc @ 2 bar pressure and beyond.

My thinking is that as long as my EGT's stay under 1800 or so Fahrenheit, and I have enough fuel and no ignition issues then I think my limit is set at around 1,5 bar pressure.

Any one with experience running around 1,5 bar pressure? How much advance timing is too much at that boost level (obviously I do not want to find out my self)?

I dont have any magic number, but I would be happy to see anything near 500 at the wheels.

 

Good Luck !!

 

Thanks!

 

pictures of leading-only housings?

 

I think i have a picture on my computer. Basically looks like a normal housing, except no threads on the trailing side as well as it is blocked off. No pics from the inside though

 

Good luck! How did you do?!

 

Not great to be honest. I have some trouble with misfiring every now and then. Not sure what the cause is, but I think it has to be something with the ignition system. We did replace coils, igniter and plug wires but that did not help. It randomly misfires during normal cruise and seems to get worse past 6k rpm at full throttle.

Also, my boost controller - which is now labeled vintage - does not do its job. So there is no way to control the boost, and it falls off after the torque peak. Instead of gaining hp I'm loosing hp the higher the revs go past 5k. Got it mapped at 414 rwhp @ about 5k rpm, but it falls to around 380 at 8k rpm's where it has about 0,2 bar less pressure.

 

Exactly how do you have the ignition connected?

 

What boost controller? How is it plumbed and what are the settings?

 

Funny enough I think the misfiring problem belongs to the past. Looks like my water injection at times blew in a lot more than it should. No misfires on my last test.

I have IGN1A TTL coils hooked up to the trailing side signal.

Boost controller is hooked up as a open loop, but i am going to try closed loop and go over all the wiring. Its a hks evc 3 unit.

 

Explain the exact settings you are using on the EVC 3. I'm pretty sure the 3 has only a **** and a switch on the back for internal vs external wastegate.

 

Nope, it has a power button, mode, high, low and SBC. As well as the internal/external switch. Let me get back here after I have the time to go over things again.

 

Actually think I found the error(s), I have it hooked up in closed loop now with the unit set to external wastegate. Two out of the 3 filters for the vacuum hoses where totally blocked, I'm heading out for a ride now. Hope things work.

 

Well at least it did not boost endlessly on closed loop like it did before. It has stable boost now, but it's stuck at 1 bar. No matter what i do doesnt make any difference.

Automatic mode, high/low setting adjusting boost from 0,8-1,5 bar adjusting gain setting and nothing helps. Manual mode also does nothing.

Think this unit is ready to hit the scrap bin.

 

maybe dirt in the solenoid making it stick? or wg spring too weak? make a careful run without anything hooked up to the gate an your eyes on the gauge..

 

Not sure if its the solenoid or the controller, but I have just installed a new solenoid and tried hooking it up to the PFC to control boost. Hopefully I have time for a test ride today.

I tried hooking boost to the sideport and venting the top port and it holds stable boost at 1 bar, excactly the same as when the faulty solenoid/boostcontroller was hooked up to it.

 

I know you connected it to the side port, how did you hook up the solenoid? Do you have any Datalogit logs of the boost control? Have you checked the wastegate to make sure it's sealing properly?

 

I connected the solenoid to what I believe was the wastegate control plug, a black 2 pin femal plug with a white dot on it.

I connected port 1 on the solenoid to a boost source, port 2 to the top vent and port 3 to atmosphere. Went for a ride and it did nothing. Came home and realized that port 3 and 1 is swapped around the wrong way...



I was logging the boost and it stays put between 1.02 and 0.99 kPa between 5 and 8k rpm, just slightly taping off at the top end, every run was the same. WG duty was working its **** off without anything happening.

I havent checked the wastegate, but the boost is very much affected if I take away boost from the sideport (1,44-1,23 kPa through the same rev range). So I guess the diaphragm should be ok.

 

New day, new opportunities.

Was just out for a drive, and guess what. Boostcontrol still does not work.

At this point, either I used the wrong plug for the solenoid or my wastegate does not work.

Is the top port supposed to be totally air tight? I tried blowing in the hose to the top port and air flows through with little resistance.

 

This finally works. My stupid **** overlooked a second port on the top of the wastegate. No wonder it was "leaking".

Well, overboost occured on the first run when everything was in place. It turned out boost needs to go in to port 1, not port 3 on the solenoid. After this it all worked like a charm!

Boosting 1,5 bar all the way to redline. Fun!