Yes it is and I must say I'm loving it, I really like it. Once Tim puts up the torque curves of the different lengths, look at where the dip is, at first I said to Tim that I believed the dip was caused by the quads, then after seeing the standard curve which is nice and flat I was sure. Then after trying different tube lengths change where the dip is, obviously an intake resonance problem.
I reckon there is still more in this engine and to be totally honest we actually haven't spent that much time on it, huge gains changing cam position(vvt), you must hear this thing on the dyno in real life, at about 6500rpm it gets this incredible intake shrill to it, I'm sure Tim can elaborate more but as we have been tuning it, it's been getting angrier and angrier.
If you look at his first power run before we had a look at it, basically where it climbed out of the dip it really only had a 2000rpm wide band, my initial aims were 125kw and to extend the power above the dip another 1000rpm, well we have exceeded the kw figure and not only did we extend the rpm about 1000rpm higher but also about a 1000rpm lower.
I really like this engine, foe an NA 2 ltr it really delivers, I have dynoed a number of F20C S2000's and they too deliver awesome kw for an NA BUT at 9000rpm, where as this engine just cranks the torque. Tim is coming in early this week to give us plenty of time to clean up the map, so I'm hoping for more mid range torque.
Just for the interest of readers when we initially were messing with the vvt, I was picking a certain load point and just getting a feel for how much extra/less torque we'd get as we changed cam timing, some of the gains were MASSIVE, there was smiles all round.
Great engine.