The boost on my jap import WRX 1995 is currently running at 0.9, a person who seems to know what there talking about has offered to turn up the boost on the turbo for a quick way of gaining some extra power to 1.1 to 1.2 and has ensured me that this is safe?
The last thing i want is to blow the turbo or blow up the engine or some sh*t.
What do you reckon, is this safe?

 

new engine rebuild here we come

 

Ok, here's the equation, you solve it for me. 13 year old performance car + extra boost - no fueling, ignition adjustments or supporting mods =

There is no cheap way to get power, sooner or later, you pay!

If you insist on getting the boost increased in a crude fashion, you should have the car checked over by someone with a wideband AFR and det cans to make sure it is running at least safely, if not optimally, on the increased boost. If your mate goes misty eyed when you mention this, bid him good day!

 

Yeah it'll be fine, mate. Whack it up to 1.5bar, no problem.

 

How is he going to turn up the boost?

And raising it to above 1.1 bar will mean it will hit fuel cut on the standard ecu (think you should have a z4 and fuel cut is 1.07bar).

IMO even before you start messing around with upping the boost make sure the car is in good health.

 

Most likely he'll stick and fuel cut defender and a dawes on there.

As said, I wouldn't advocate this approach to tuning an Impreza, especially not one that's had 13 years of wear and tear!

Ns04

 

Cranking up the power of an old car (presuming original mechanicals) could end in tears....be it doing it the "correct" safe way, or the bodgit and scarper way.

So, do you feel lucky? well, do you?

 

I have a feeling he will just wind the actuater out on the turbo

 

doubt it actuators (standard) aren't adjustable

 

Perhaps a hypocritical opinion, as I wouldn't do it myself but people have been manually upping the boost with turbos for years without detrimental effect (assuming they didn't stray outside the limits).

It's fairly easy to up the boost by reducing the amount of 'signal' that the actuator receives.

The problem is (as I eluded to earlier) there are limits and it would be easy to stray outside them if care was not taken.

In summary, plan your mods and get the associated remap.....

 

Go for 2 bar. You might get a good 1/4 mile but thats it.

Get a remap or a standalone ecu unit to do it safely.

 

talk to one of the many tuning company around mate.
they will be able to tell you how to get to a safe power level
with your current setup and of course budget.

where you from?

 

if its any concellation to you (hope i spelt it right) i have a 9 year old classic (T reg) with a dawes valve, decat and full stainless with a k and n induction kit, running a standard turbo and standard ecu. the car is boosting at 1.15 bar... its been like this for 5 years, and believe me, it has had a hard life... 62000 miles on the clock, regularly serviced and its been fine... (watch this, 2moro she will blow up) i plummed in the dawes myself (i'm a mechanic by trade)... if oyur goin to do it yourself (or your mate), do like i did, and follow really good advice, and a step by step. buy a boost gauge too, so you know when not to go too far... my fuel cut kicks in when it is really cold, so i wouldnt reccomend anything to remove this safety feature...

andy

 

When i first had my car and knew nothing about tuning turbo cars, i went to a local jap tunning company and they advised me to have a boost controller (i went with a blitz SBC) HKS Fuel Cut defender and uprated fuel pump so i did.
They set it all up and DET checked it, was running 1.15 bar with the fuel cut set slightly above this.
I ran the car like this for over a year with no problems, eventually fitted a bigger turbo, FMIC etc and had a full re-map

I would say it's not the best option and probably wouldn't do it again myself, but if done properly within safe limits and checked for DET and lean running etc, then it should be reasonably safe.

 

should go ask someone who knows about this stuff too many on here think they know what there talking about but dont such as stevebt jtaylor and scoobytc

 

you dont get owt for nowt

proper remap is a far far far far far far better option. cranking up the boot will just cost you an engine done in that way

 

I think the posters you refer to were being sarcastic in thier responses mate!

The OP should seek professional advice though. I would suggest David at APi. They should be aware that the answer they get most likely won't involve Dawes, fuel cut defenders, chipping etc....

As Tidgy says, Reliable power costs!

Ns04

 

I think Stevebt had the most constructive thing to say to be honest and he knows what he is talking about IMO.

 

who says we are being sarcastic??? some of us do know what we are talking about, and didnt spend 4 years at college just to learn how to tighten a nut and bolt.

 

Ive had enough modified Imprezas to know EXACTLY what i am talking about thanks.The only comment ive made on this thread is that standard actuators on impreza turbos are not adjustable
I wonder if this person who told the OP to turn up the boost with no fuelling changes was this black06 fool because he clearly hasnt got a clue.

Your safest bet regards to upping the boost is to get hold of a mappable ecu such as apexi or simtek and get someone like Jolly green monster or Andy F or any of the other big fish in the mapping game and get it done properly or it will end in tears

 

what a ****ing gayer

 

Wasn't having a pop at you mate. More the "Turn it up to 1.5bar; it'll be fine" comment - I very much doubt that was serious!

People do use a dawes to increase boost and if checked by someone with a wideband AFR and det cans, it can be ok. BUT it's not optimal, and much better and safer gains can be had with a proper remap.

I would imagine I'm preaching to the coverted in your case though!

Ns04

 

Listen, mate, I've been modifying Subaru Imprezas for weeks and haven't run into a single problem. Gary at Plymouth Auto Tune said 1.5bar would be fine and that chips are a waste of money.

 

****face

 

scott.t chip (polar performance)cheap as chips and will do the job safely

 

Stick to beds!

 

90% of the time if the cars mechanically sound then there is enough "play" within the ECU to enable the boost to be turned up slightly, be correctly fuelled and det free.
The standard car does run dog rich.
I've done a few boost controller fits on the older models that can't be mapped.
1.1 bar is usually the safe limit for both fuelling and det.
This doesn't mean you can go out and zip tie some dawes device in and go play with the big boys. It needs checking with professional equipment.

 

HaHaHa I just offered an opiion not advice why don't you tell him what to set the boost at then

 

ha! quality to many people on this forum think they no wot there talking about when they actually no JACK, if you some of these dim wits were to actually shut up and read and notice wot the people in the know were saying then there wouldnt be so much bull floating around the forum!

 

Once fixed to make it readable....

Quite true.