QUOTE(Bleyseng @ Mar 26 2015, 09:48 AM)
QUOTE(Olympic 1.7 @ Mar 26 2015, 06:05 AM)
QUOTE(pilothyer @ Mar 25 2015, 09:27 PM)
Jim, Ideally you would replace the CHT with the one specified for the year and engine size for D-Jet or L-jet. Now days it seems as thought the one you mentioned, and Bosch 280130012 are the ones available for all years and engines D-Jet or L-jet with the exception of the 73 2.0 D-jet. That one just seems to be left out.
The main thing I suppose is that the CHT should measure high OHMS (2 to 3 KOHMS) when cold and very low when warmed up (less than 1KOHM) and most older CHT sensors could benefit by replacement if the tolerance has changed with age. For the 73 you would probably have to make your own using a variable thermistor.
Why would the 73 2.0 be different?
didn't the 74 -76 2.0 also run the d-jet?
With the 2.0L six killed Porsche rushed the development of the 2.0L four. VW engineering was saying the type 4 was stuck at 1.8L due to the cam to crank clearance. Porsche offset ground the crank for the 71mm stroke, developed the 3 bolt heads etc to get the 100hp 2.0L 914. But Bosch didn't have time to develop the ECU so the 73 uses a 1.7L ECU, special MPS and one year CHT to work. All this development was done in less than a year but for Porsche with their racing background engineering not too hard a feat.
Interesting to me also.... Although my car is far from running the engine is built.
I have a '73 that was running the stock D-jet setup. and I took it to 2056. adding a Raby 9590 cam and new heads worked by HAM.
My plan was to run the original ECU... I don't know what the special MPS is, but hope my 049 MPS can be modded to work. either by using the Tangerine kit or adding some type of ballast resistor if necessary. maybe both.
Right now I have the 1.7 CHT installed.
I didn't think that this was a total Frankenstein setup. but the more I am reading it gets me to thinking there may be more problems with this than I anticipated...
If any of you have put together a similar setup to mine I would really appreciate hearing what you did, any problems encountered and how you solved them
BTW I have looked at P.B. Anders site quite a bit and thought that tuning the MPS would be the biggest headache. but not undoable.