The Digijet has a limit too, fuel pulses are shortened when the upper
rev limit is exceeded.  I've accidentally tested it, unfortunately when
attempting to overtake another vehicle!  It is  programmed into the
chip, and virtually all EFI systems have it.
--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT