Patrick:
Yes, the 1986 and
all Motronic DME's (2.0 or later) are adaptive and a self learning engine management system (see pix below pg 33, Motronic Systems, Pulse Injection-Theory; Book:
Bosch Fuel Injection & Engine Management 1991). They should make the proper timing fuel and ignition adjustments with a proper working oxygen, air temp, coolant temp and air flow metering sensors with the gains which are really throughout the rpm band, not just peak. All the 944/968 DME's include FQS programmable selective settings which are also available for user base setting tune-ability.
Bare in mind, a MAF air flow sensor conversion (Rogue Tuning or others) also allows for increased nonrestrictive airflow (+6 to 12%) which makes also noticeable difference in performance by delivering air flow volume and cooler air temps for combustion and the Motronic DME with the MAF configuration mapping will also make the proper correlative adaptive adjustments.
Usually a 20% increase in any engines performance will demand more custom base tuning for overall drive-ability, power and economy.
Hope this sheds more light on doing the SS custom valve upgrades, later...
__________________
Guru944
2006 955 Cayenne S Titanium Series - Marine Blue, 1987 Porsche 944S Club Sport.
1987 Buick Turbo-T Lightweight "Great White", +500HP, TA49 Turbo.
http://www.blackbirdmotorsports.com,
944/951/968, 911 and 955/957 Performance Solutions.
Thank you Lord, for your Loving Kindness, Tender Mercy, and Grace. Only You are Faithful.