Just posting Luke's dyno up on his behalf. Solid line was immediately after tune when it was running fine and the dotted is now since its lost power.
Was comparing the curves I got and even though its on a hub dyno you can see the similarity with what we saw with the shape of the curves.
I was going to wait for Luke to post this but I have been badgered by Clockwise the last few days to post something to stop the rumours going around that it was anything to do with the engine build. A lot of people use Ian for his experience in K20 builds and suggestions that timings have moved and there could be head problems have been affecting his business and ours. I have made no secret that we use him for doing certain blockwork jobs we can't do here and to have people calling up having on-going projects with us seeing threads like this just gets people unecessarily worried.
I have seen quite a lot of these motors in the past few years and the cams are a good fast road one that makes monster torque on low cam, tails back slightly then rises quickly as you change to hi-cam. They benefit massively from a good intake and a recent tune I did with the same cams but on a 2.1 sleaved motor that Ian had also done, running Toda ITB's made a massive 287bhp and 206ftlb! It looked like a supercharger curve and sound is insane!
So. Please don't be put off by anything that has had Ian at Clockwise breathing on.
Here is the before and after dyno graph.
Don't be fooled by the wavy torque curve on low cam. To put it into perspective a tuned car will make 150ft/lb pre-vtec. This is 170ft/lb at 3500rpm then fell back slightly before rising again at 5000rpm.
Vtec point on the dotted curve was at 4200 with no window. Optimum was actually 5700. :xgrin:
