i've noticed something strange on the VDR charts when im doing a comparison with past pulls. can someone tell me whats going on with the drop between 3500rpm and 5000rpm? i did these a few months apart and since then i have fitted a s90 70mm tb and had the stock IM ported to match. surely this will not cause this? i have noticed the WGDC is higher thru the whole pull and the load down low is lower than previously, could it be a boost leak? the gasket that came with the TB was only paper and i also fitted a P2R thermal intake gasket between the IM and head. thanks.

 

Boost leak.

 

surge?

 

Occupant weight is different and possibly temperature? I don't really see much wrong with it.

 

thanks for the idea's. i've ordered a boost leak pressure tester, should be here today or tomorrow thats what im suspecting. temps would have been pretty close on both pulls and also the weights are pretty accurate.