30-05-2012, 02:36 PM
The XU7JP4 heads are horribly restrictive, I've heard places they are literally the same casting as other XU heads, but they literally gave them seats and left the head casting alone...
They can be made a SIGNIFICANT amount better by literally taking a drill to the ports, they're so bad as standard, you can get 30hp or so by just playing with the ports!
There's a photo somewhere of Nialls head - you can see the actual ports are almost triangular!
The head is fairly simple to get off - you could have a play, especially if you're playing with management.
And yes, if I were you, I'd look to get a Bosch Motronic system, everything should bolt into place... Even if you steal it off an S16, I know they came with Motronic... Get someone to remap it - you then don't have to pay for "custom" management and have to start from scratch...
Theoretically you could plonk an S16 head on, use the S16 management, and it really wouldn't take much to get a good map from it....
They can be made a SIGNIFICANT amount better by literally taking a drill to the ports, they're so bad as standard, you can get 30hp or so by just playing with the ports!
There's a photo somewhere of Nialls head - you can see the actual ports are almost triangular!
The head is fairly simple to get off - you could have a play, especially if you're playing with management.
And yes, if I were you, I'd look to get a Bosch Motronic system, everything should bolt into place... Even if you steal it off an S16, I know they came with Motronic... Get someone to remap it - you then don't have to pay for "custom" management and have to start from scratch...
Theoretically you could plonk an S16 head on, use the S16 management, and it really wouldn't take much to get a good map from it....
