OK. Downpipe fitted for testing purposes.... Interesting.
Took it out, and immediately there was a noticeable gain in performance. Liquid showing gains of ~20 bhp (before: 262 after: 283) and similar amounts of torque gain.
However, I then discovered that there was an issue with the car. As soon as I took it out, revs dropped right down when rolling in neutral, and would then come back and stabilise. Very strange. Anyway - this got progressively worse. Turns out that the stub for the DV off of the TIP had torn clean away. I 'fabricated' it back on, but wasn't the best....
Saturday morning, I took the car up to Bill's to the dyno and had a run. Car wasn't producing any more power than before - around the 260 mark - however torque was up by about 20 lb/ft. At this point, the car was visibly hunting like crazy on idle, and short term fuel trims indicated an air leak. Also, the air flow readings, and the BHP output didn't really match up - I have put this down to the air leak in the TIP pulling in unmetered air.
Bill lent me another TIP for testing, and I fitted that - now all fine again. No hunting. Also - this TIP is stronger than the one I had on, and the noise of it cavitating has now gone.
I have done some liquid runs since fitting the new TIP, and am now getting air flow readings of up to 229 g/s. Liquid confirms 287 BHP and 280 lb/ft of torque.
I am hoping to get back on the dyno as soon as I can to see what's what.
To be honest, I am happy enough with the improvement in drive ability - it drives so much better. :thumbsup:
Here are some shots of Liquid at it's best....