blachie

i m sure someone else has asked that before but...
ok my car is my00 with a full decat racing trust exhaust and samco hoses.
if i fit an ebc how much boost should i set it at?
curently it goes up to 1.05 overboost then settles at 0.9
a friend runs his my97 at 1.3overboost without problems for 40000kms.
so where should i set the ebc?

john banks

I would suggest you use diagnostic equipment or get someone to do it for you to see when the ECU starts to pull out ignition timing and stop there. If you keep raising boost in hot conditions the ECU will add fuel and pull timing and you will not make the car faster and it will be unsafe. I think you would be OK at 1.1 bar. In the UK up to 1.25 bar on the standard turbo/IC seems OK for road use - on track worth dropping it.

blachie

thanks john

BretMan

Just an update...

Thanks John, for the advice on fitting a flow control valve to act as a variable restrictor. It works well on my STi - we had a session last weekend out on some empty back roads to set it up and it was very easy to adjust.

I currently have it set so that it holds about 1.1-1.2 bar through the gears and in the worst case hits (e.g. 6th gear, low revs, high load) just under 1.3 bar (with no knock indicated on the knock link). This is 6.75 turns out of a possible 16 on my valve (with a maximum orifice of 3mm)

Highly recommended and it beats messing about with restrictor changes. (Also a good chance to upgrade the factory hoses and clamps.)