I know HP Tuners offers tuning software for 97-99 Buick Riviera 3800 years, however for 95 I belive it'* memcal and I'd have to use Tunercat to program the PCM. I haven't purchased the car yet, but there is more 95'* in the area then 97'*. So the question is, how hard is it to upgrade to the 97+ PCM so I can use tunercat and has anyone done it?

you could do a complete drivetrain, Wire harness and possibly more to make it happen....you would have to get a Riv FSM and see how many functions are controlled by the PCM...not to mention that the location of it changed from 95-97....

honestly it would be easire to use the 95 PCM and get it programed

the 95 motor and the 97 motor are completely different first off. The 95 is a Series 1 while the 97 (really 96+) is a Series 2 motor. Inorder to use the 97 PCM, you'd need to swap the entire drivetrain and functions.

This is why 1993SLE is saying it would be easier to tune the 95 PCM.

BUT...I bet a reprogrammed 95 pcm *could* operate an S2 engine. Remember, a PCM doesn't care WHAT engine is there so long as all the sensors the PCM requires is operating

After the ICM hands off ignition and fuel timing to the PCM, what'* the 95 PCM going to think of the 95 HB? What about the trans? The extra knock sensor? The MAP sensor?

95 doesn't have a MAP on the riviera. Because it has no boost gauge. That'* a HUGE part of fuel delivery in the 97 OBD2 PCM'* that require MAP sensors.

Far too much work to geterdun.

It'* be easier to go to say a 93 SSEi drivetrain, but then you're with Jet, instead of all of the options for OBD II.

It has been done will.

http://dtcc.cz28.com/eprom/index.htm