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MF2 that is the
little device we used before we went EFI. We had a RussCollins 1000 cc injector just above the throttle house, it was controlled by manifold air pressure set to 0.9 bar, we used EGT and a broad band lambda to monitor it.
The ports are bigger, 41 mm intake and 38 mm exhaust and the intake manifold was ported to 41 mm.
We noticed no problem at all, with that system, the AFR was pretty good, although not perfect but good. The car pulled extremely well, at 1.2 bar we had 530 Hp, with 0.8 bar and no extra fuel around 410 Hp but the AFR was way to low at the top rpm and full load (0.8 bar), so the car seemed to go much better and had better EGT and AFR with a higher turbo load and the extra fuel from the 7th injector, than with only CIS, wich had a modifyed WUR, and 0.8 bar load.
But we wanted to reach a higher level of power and driveability so thererfore we went EFI.
We think that if you make some effort to make the right position of the 7th injector and monitor it with EGT or broad band lambda or both you should be able to increase the power in your engine in a rather cheap way. With good AFR and EGT
And note that this is our experience with this device, and we can only speak for us in this matter.
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