Mspeedster

No I don't beleive that's correct. Based on the engine number provided earlier in this thread, the change over to the stronger IMS took place during the MY05 run.

As I mentioned above, I believe all MY06, even those built in 2005, will have M97 engines that begin with 686. My car is an earlier buiild MY06 and it still starts with 686.

Mspeedster

Then he should change the title of this thread.

mgordon18

My conclusion, from the data I've obtained, is that any non-X51 M97 engine in a car with a production date after December 2004 should have the upgraded IMS. That would include the 2nd half of MY2005 cars, and ALL of MY2006 cars.

This conclusion stems from 3 assumptions:
1) Engine #M97/016859791 is the first M97 with the upgraded IMS.
2) All cars with production dates after the first IMS upgrade ALSO got an upgraded IMS engine.
3) My guess that MY05 engine 9791 appeared in a December 2004 production car is correct.

Now if we could just find the production dates of the '05 S cars that grenaded, we can see if they generally fit my hypothesis.

- Mike

ELUSIVE

RollingArt

ooopps, I should pay attention then. Didn't notice that.

Should def be asking '05 owners.

mgordon18

You're right. I should change the title of my thread.

The reason I started with MY06 owners is because I was convinced that the IMS upgrade switchover happened in MY2006, not MY2005. So I was barking up the wrong tree to start with.

But once I understood the coding of the engine numbers (i.e. that 6859791 was in fact an MY05 engine) I simply took the MY06 data and extrapolated it to MY05 to make my guess.

ELUSIVE - that 40,929 engine is the x51 outlier - the exception that proves the rule, if you will.

ELUSIVE

I'm curious to see if others with X51 will chime in and see what their engine numbers are.
Perhaps Porsche knew they weren't going to be making 40,000 motors so the 4 there denotes X51. Could there be 929 X51's out there by Feb 2006 for the 2006 model year?

mgordon18

One could, of course, create a graph, and subsequent IMS upgrade timing guess, for all the varieties of P-car IMS engines. x51, M96, etc. (Are there any others?)

We'd just need a poll to get people to submit the appropriate information - Production date, full engine number, 997/Boxster/Cayman varietal.

You think a poll like that would get traffic?

cibergypsy

My engine is an M97/01S as it has the X51 Powerkit with serial number 68613820 and build date of February, 2006.

dimsum623

2006 - 997S Cab
Prod date 05/2006
M97/0168620739

mgordon18

Well that makes this more interesting. Your car fits nicely into the standard pattern. What about re-built engines? I think I remember hearing that rebuilds get a different engine number...

ELUSIVE

Island - Any chance you can confirm with the number on the engine? Took me about 30 seconds to find it on mine and snap a picture.

Palmbeacher

My MY05, build date 01/05, has the small single-race bearing. I had it upgraded with LN retrofit when I had the clutch replaced.

mgordon18

A ha! Someone on the cusp! What's your engine number, Palmbeacher?

mten

here is mine
06 C2S
Product 07/2005
M97/0168600833