Whats the idea behind these electronic boost controllers.Ive seen a few on ebay,like apexi and gfb.I no there to up boost from inside the car but surely you can only adjust so far because of the fueling.Can someone explain to me abit more about them.Are they a waste of time and money

 

On a standardish car yes but once you get to a certain level the quick reponse from the boost solenoid helps, 3 bar map sensor lets your run more than 1.55bar on a newage or 1.7bar on a classic, in gear boost adjustability and so on.

They are becoming more redundant as the aftermarket ecu scene has progressed, especially with the ESL board now available for the 92-96 cars

 

if the electronic boost controller was used and say for example you ran the classic at 1.7bar would there be enough fuel to cope with the demand you put on the car.Wouldnt the car run lean in anyway

 

Absolutely could not cope at 1.7bar plus the boost profile would be all wrong. Yes the car probably runs quite rich as standard but 1.1bar would probably be the most you could do.

 

I have an old apexi super avcr boost controller which I was going to fit but then thought better of it. Remap is the best option to increase boost.
Out of interest are different version Impreza fitted with different map sensor?
Any recommendations on where to get a 3 bar map sensor from?

 

Yeah I think there are different map sensors between classic and newage models. I'm sure I've seen people using classic sensors on newage cars too. What are you aiming for anyway that needs a 3bar sensor? I'm not sure where you'd get one, sorry!

 

Pretty sure the 92-92 cars read to 1.1bar, the 97-99 cars read to 1.7bar and newage cars around 1.55 bar.

I'm feeling helpful today, so for a 3bar map sensor get this

http://www.ebay.co.uk/itm/3-BAR-MAP-...item4ade1aa3de

 

I would only be aiming for 1.4 bar max as my turbo would pop if I went any higher. Do you recon the oem map sensor would be ok for 1.4 or would it fuel cut? It's a V3 WRX type RA

 

It will be fine Rich

 

I'd say it'll work fine. I've a V3 UK Turbo and it'll read up to 1.7bar as said before. You will get fuel cut if the ECU value isn't changed. ESL required for that!

 

You really are banny
What time do you want me to drop my car off so you can fit my goodies?

 

you might not get it back, as I'm having subaru withdrawl symptoms at the moment

 

Nice one. I'll probably never see close to 1.7bar so I might as well stick with the standard map sensor

 

on 2nd thoughts!

 

Just remember it's not all about pressure, it's air volume! I assume you have a TD05? I doubt you'd even need to run higher than 1.4bar to make well in to the 300's.

 

VF22 standard on RA so my gearbox and turbo will probably max out at 350 but that's all I'm looking for atm

 

With the short ratios anything over 320bhp and it feels like a missile, my type r is running about that on a vf28 at and feels great on local roads

 

It does go through the gears like a motorX bike and I don't want to break my baby lol
320 ish would make me smile a bit more than I already do,,,if that's possible,,,love it

 

Ah yes, forgot about the VF. I'm just about to stick a TD05 on my car. No doubt I'll need a new box very soon lol

 

I have an apexi avcr and i think its a great bit of kit, Its not only a way of increasing boost levels from inside the car but it also makes your boost more stable throughout the rev range.
Another great benefit is that you can control boost levels for each gear, ie i can hit 1.6 bar (which my car was mapped to) in every gear and manually increase my wastegate duty for different revs so i can bring the boost in as smooth or as a hard hitting kick in the back, again in each gear. It also comes with a 3 bar map sensor and a fast response 3 port boost solenoid for fast and accurate control.

You can also have 2 different boost maps and a third at actuator pressure when turned to off which could be handy as a valet mode setting, although i still hit 1.1bar at actuator pressure so it still goes quite well lol.

Andy Forrest still recommends them as a good upgrade especially when going above 1.54 bar on a newage as already mentioned thats the max the stock ecu can measure. As long as you dont exceed your max preset boost level they also add some safety as they will stop the boost from overshooting and spiking

 

If 1.5bar was used on a std impreza set up how much bhp are we talking if the electronic boost controller was used

 

All depends on the turbo, say a VF28 at 1.5 bar will net you aroud 330-340bhp but a GT35R at 1.4bar got me 530bhp. So boost is relative to how much air the turbo will flow...

 

Jesus thats a lot lol.im not going that far.my forester only come with a 177bhp and ive put the td04 on it and it has the 440cc injectors and a full decat .

 

TD04 will run out of steam between 280/290bhp I'd say. That's why I'm going TD05.

 

I would be happy with that.Thats enough for a daily fast road car.my 440cc injectors max out about 330bhp and i dont want to play any further than that or put any stress on them

 

I've bought some 440s as well and already have a new 255 pump. I want to stay around the 320 mark too for the sake of the box.

 

Lol.is it the amount of torque that breaks the box and is it normally second gear that goes first

 

Mine had a new 3rd gear set installed at some point. I have the receipt for the work. I'll let ya know when mine breaks again lol

 

So the good thing about a electronic boost controller is you can limit the boost between each gear change.protects the engine and the box.