P7 vs P8

[851neil]

Ok can anybody tell me how to tell the difference between the P8 and P7 ECU ?? I need to check which ECU is fitted coz if it's a P7 I'll be chasing after a P8.
cheers

Neil

[paynep]

What's the number on the sticker, or stamped on the mounting lug?

Alternatively, if you're feeling adventurous, whip the lid off and find the clock chip - if its 4.000Mhz it's a P7, if its 8.000Mhz its a P8.

Hope that this helps

[851neil]

the number on the sticker is:
WU43.07/20A.20

[paynep]

99.99% sure that's a P7 as its almost identical to the number of the ecu on my 851, which has an FIM chip, open airbox and a 50mm full system on it.

[Edited on 3-5-2005 by paynep]

[Shazaam!]

My 916 (that has a P8) has an under-seat sticker that reads: Engine Family: SCG.92P8GARA

[851neil]

so does anybody know if the 916 P8 ecu is compatable with the 851 ?
I've been told that it's a straight swap but I'm not sure if the unit from a 916 is the same size etc ??

Can't you tell I'm new to Dukes !!!

[Ducman851]

Well the P7 is your basic FI computer, with the P8 you can get rear cylinder correction.

I have a P8 on my 1990 851 Strada and what a differance it made. Smoother power over entire rev range, better idle. This is possibly due to map for 888 that I had made as a starting map is closer to bikes actual needs. My P8 came from a 1998 Laverda 668 Ghost that I parted out, and was a straight bolt in.

If youd like I can get some pics tomorrow of the side by side of them.

[Edited on 7-5-2005 by Ducman851]

[Rob B]

I think you can swap them but you'll need a P8 chip for your bike. They come up on E-bay but I'd get one from JHP so you know exactly what you've got.

Rgds, Rob

[Mike Cecchini]

Note on P7 vs P8 ECU's:

All 851's and 888's up to serial #'s 000508 have P7 ECU's.
888's from # 000509 onwards have P8 ECU's.