Hurray, we have a winner!
Gary, the clues weren't directed at you - I guessed that you'd taken in and understood what I'd said on the other thread. It just seemed that every time I pointed out where the
problem lies - pre-turbine back pressure (credit to max_torque for explaining its importance) - it was ignored in favour of some other improbable theory that didn't fit the facts or maths such as fuelling. Was beginning to think I must be typing in f*cking Chinese!
The waters have been muddied somewhat by the Milltek D/P not actually being what it was supposed to be and by Bill's car requiring higher boost than the equivalent IHI'd Golf to obtain a given output which suggested that any restriction may not be due to the downpipe. However, it may be that even the IHI D/P on the
Ibiza is more restrictive than the equivalent Golf version?
One other point to bear in mind with the E-05 is that even if it does finally produce Stage 1 IHI output, if/when you get bored with it and want to upgrade, you'll have to swap to a bigger turbo again.