hi peeps whats size is the standard pill size on a 97 uk turbo. im gonna drill mine out to 1.5mm cos car is overboosting. i know its the pill cos there wasnt a problem before i put it in.

 

1.2mm is standard, but with full decat, it can sometimes overboost a little on the stock ECU and trigger fuel cut. Be carefull when drilling them out, a little goes a long way!

 

cheers mines fully decat and fuel cutting. if i do 1.5mm its only 0.3mm bigger so hopefully should solve the problem.

 

It will flow over 50% more going from 1.2 to 1.5

 

is that to much ? my car feels like its hitting a concrete wall when i boost hard.

 

I am sure it would stop the fuel cut but as Paul said it may be too much and means it wont make boost.

Do a bit at a time.

 

any idea where to get extra small drill bits

 

Most engineering supplies places will be able to sell you twist drills in 0.05mm increments which is what you need. You may find someone like Maplin or model shops worth a try too, or the Dremel section of a big DIY store.

As has been said going straight from 1.2 to 1.5 is almost certain to be too big. Go to 1.25, try it , 1.30, try, and so-on until it's right.

 

Thanks a lot guys for your knowledge. This is a great site with great people on it. goin shopping now for mini drill bits.

 

having the same issue with mine, heard drilling out the restrictor pill is a good way of sorting out the overboost - however, its a tricky little thing to drill so i want some spares just incase - anyone know where you can buy these from?

 

Dealer

 

yeah i should have really thougt of that myself! god its been a long day!

that said - i just have to find a dealer now! think nearest is coventry to me. i'll give them a ring, sure they'll be nice n cheap!

 

I beleive they are cheap for once yes

 

Sorry to hijack but does anyone know the correct size pill for the UK MY97 fitted with the PPP? Asked the dealers and just got a blank look.....

 

1.2mm on a 1997 UK in standard form.....I don't think there was a specific orifice for a PPP though.....maybe one of the mappers could shed further light on the PPP que?

 

this is going to make me sound a prat but what are you guys on about???
i have a 97 uk classic as well with full de-cat and headers etc,walbro pump and induction.would drilling this pill out make any differance to mine?

 

if it's not broken do not fix it mate

 

mine is fixed and i wana break it..................... does that matter.... i just fiddle with everything.......a little bit at a time..uk98 wagon( dunno bout pill but my boost gauge reads 15-16 psi) what does this pill look like ...... also can someone explain the verry strange fernomanum of "OVERBOOSTING" surely that must be good for "GO FASTER" people........confused because other chap said """" like hitting a brick wall"""" hhhHHmmMMMM

 

Mucking around with the restrictor pill won't get you anywhere you want to go, at least if you think that place is more power. Your ECU is tuned to work properly with the standard 2 port solenoid bleed-off setup. You can often cure overboost by drilling the restrictor out bigger (as, on many cars, when you fit a decat) but you will not get a significant boost/power increase from fitting a smaller one.

If you fit a smaller restrictor, beyond a small point (a measly 0.02 bar on most standard Subaru ECUs) you will simply interfere with the boost error control system in the, and either cause oscillating/inconsistent/fluctuating pressure, or, eventually, if you go really silly, consistent fuel cut or engine damage.

It's good for people who get paid to rebuild engines as it's a really easy way to find yourself requiring their services at a point not of your choosing.

Overboosting simply means that the pressure being generated by the turbo overshoots the target the ECU is trying to keep to. It will try and correct this by reducing the wastegate control solenoid duty cycle but, if it is unable to correct (like when people fit a too small restrictor in a 2 port system), it will eventually instigate an emergency fuel cut to prevent the engine (or turbo) being damaged. That causes the "hitting a brick wall" phenomenon you've seen mention of.

However, consistently driving the car into fuel cut like that can cause short term transient detonation as the mixture suddenly goes lean. It's not good for the engine, albeit better than driving it consistently in a performance envelope it isn't set up to run safely in.

There's plenty more written on this so a click of the search or a read of the FAQ forum would help you a lot.



confused because other chap said """" like hitting a brick wall"""" hhhHHmmMMMM[/QUOTE]