500 at the hub for a 3"pulley is in the ballpark you can expect. Here is another hub dyno result for a 4.2 XJR, with a DBX85/82mm TB, but bigger 4.2 lower pulley (assuming you have still the 4.0 one?)

https://www.jaguarforums.com/forum/p...6/#post1213836

 

Amiddlecott,

Do you have any further updates on your car and any possible solutions to your MAF sensor placement?

 

This upgrade has been a long and expensive mission... I have had fitted a new ECU which can cope with the additional power, the MAP on the original one was not capable of managing the fuel air ....etc

A long update is coming but have to wait till i take a holiday to get the time to do it..

The MAF was fitted in the bumper, I think the same place AVOS fitted his. Difficult to get to if you want to mod unless you fit a extended USB port lead.

not sure if this helps you.

 

I've had the same troubles - Abaco appear to have gone broke - No problem to me - I use a MAP and leave the (Abaco Junk) MAF wired to the Jag computer - (same with original injector and coil wiring, shorted out with resistors) -
My ECU is Infinity - The engineer has emailed me a week ago, saying they are only a few months away from releasing a full kit = THROW THE JAG ECU AWAY, which will run all of the Original Jag ECU operations plus be fully programmable

 

there yah go about time, standalone ECU, seems MAP systems are more tunable anyway, i have seen MAF meters cuase problems when located improperly(eddy air waves).