The Elan must not have an FCD installed (this includes the BBR upgrade). The FCD is a device that prevents fuel cut on overboost. If your Elan has a performance exhaust from Paul Matty Sportscars (they often insist on one being fitted to combat boost creep) or it has another performance modification that allows it to boost beyond 0.9bar then there is a good chance one is present. DO NOT FIT IF YOU ARE IN ANY DOUBT – CONSULT SOMEONE WHO KNOWS WHAT TO LOOK FOR.
Any MBC must be removed. It is usually a bleed valve in the pipe between the wastegate capsule and the BSV. Sometimes one is installed in place of the BSV. Either way the system should be restored to standard configuration BEFORE fitting the new chip.
Figure 1 BSV (or BCFV) plumbing
If you have a large bore exhaust fitted (>2" bore) and suffer with boost creep this upgrade will not cure it. However, if an MBC was employed then its removal may have corrected the issue. It is advisable to check the hoses to the BSV for leaks thoroughly and to ensure unions are fully secured. Remember this line is pressurised under boost so the seals must be good. Test-drive the car to see if the creep has been resolved before fitting the chip. If boost increases beyond 0.95 bar then fuel cut will still occur with the chip and you should consider porting the wastegate, putting a constriction in the exhaust and whether its worthwhile installing the chip.
If a blow valve is fitted with a spring that vents with a boost pressure less than the maximum target level then this effectively limit the boost to its cracking point and you will not achieve the rated boost for the chip. Should this occur I would advise it is rectified quickly (preferably before chip installation) as the turbo will spin very rapidly in this state due to the low resistance in the intake and the high BSV duty cycle applied by the ECU in an attempt to meet the target boost.
I have seen a PROM dump from a SuperChips installation (which was subsequently successfully re-chipped with an Everest) - the modifications were to the MEMCAL alone and therefore presented no problem with this upgrade. Its prossible other, different, installations exist so if you see anything inside the ECM that looks like a previous 'chipping' (compare the MEMCAL installation with the pictures in the instructions) let me know.