Astra Coupe Turbo 273bhp, but 25bhp less power with WI.

[JohnA]

Originally Posted by K3FUS

...Not given up yet, but I don't want to trim the map to remove fuel for obvious reasons, I have rebuilt a C-LET once because of detonation and I don't fancy a Z-LET based reincarnation!

All of my experiments have shown that one shouldn't expect power gains with W.I. if fuelling isn't trimmed accordingly.
Otherwise you might get an extra thick protection margin against detonation, but that's it. Usually at the expense of power. That's what most people do, and that's what most 'tuners' do, so they give W.I. a bad name (useless, expensive, band-aid, etc)

They are still stuck in books from the seventies and eighties, or practices from days gone by.

I have seen significant power gains with water/methanol injection both in the summer and the winter so it can be done.
The concept works.