I've got a fair amount of research into it so far, but two questions are:

1) Can the MAP sensor get similar enough pressures on the 16v manifold as the 8v?

Bore and stroke between the B234F and B230F are the same. Intake hose diameter is the same. From poking around Bernoulli's equation, it seems flow velocity through the system is the more important than X-sectional area of the manifolds.

2) Rex will want to run the timing ever so slightly more advanced than the B234 flavor of EZK. Think it's a problem? I'll be running premium fuel (and swapping the Rex flex plate).

Backstory:

The B234 is in a needy 1990 744GLE. The engine is up to date on all of its shots (i.e. I replaced all of the tensioners/belts/seals/idlers recently). Too much invested in this engine to not use it... but the car needs a lot of love.

The recipient is my '91 Regina wagon. Well sorted.... with lots of new Regina-specific bits... but the B230 is tired.

As a back-up, I've got the ECU/ICU pins cross referenced, so I think I could kludge a plug and play Regina to LH conversion with the existing dash harness (I don't want to gut the dash).

Thanks!
-Ryan
--

Athens, Ohio
1987 245 DL 324k, Dog-hauler
1990 245 DL 142k M47, E-codes, GT Sways/Braces, Dracos, A-cam
1990 744GLE 189K 16-valve
1991 745 GL 304k

It seems like I've read on this BB about people doing the opposite (Dropping an 8V into a car that was originally a 16V) and using the original 16V Bosch brain.

You'll have to make sure you use the Regina-compatable sensors, idle valve, etc. I think the throttle position switch is different also. Oh, and doesn't the 16V have a larger diameter exhaust? But if you swap exhaust systems, don't forget to use the Regina (titania?) O2 sensor.

You're an adventursome sort - good luck with it.

Thanks for pointing out the idle valve! I forgot about that one. :-)

I'm running on the assumption that the Regina TPS will fit on the B234 throttle body... but I think the Bosch switch is "rewireable" to make Regina happy.

Otherwise, it's indeed an odd situation to go 16V from the 8v.... but it's kinda the way the chips fell. Plus, I developed a strange affection for the B234. :-)

Thanks!
-Ryan
--

Athens, Ohio
1987 245 DL 324k, Dog-hauler
1990 245 DL 142k M47, E-codes, GT Sways/Braces, Dracos, A-cam
1990 744GLE 189K 16-valve
1991 745 GL 304k