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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: Nissan 200SX - SR20DET with VEMS - Östersund, Sweden http://lh5.ggpht.com/_V2yrN18mN60/S_PU7N5VWnI/AAAAAAAAACY/0e80nRFl_Lk/s640/DSC00061.JPG Contents: MembersPage/Larsa/VEMSpictures MembersPage/Larsa/Firmware ----------------------------------------------------------------- Tachometer problem: Orginal tachometer has a dutycycle of 33/256 and dont like signals other than that. * do you happen to know tolerance ? * is that common for Nissan 200SX or all Nissan ? I run the old open source-code (r027) and I made a successful change in it to make it work. but I will upgrade to newest firmware soon.. - Is it possible to add a new constant which define the duty of the tach signal in the newest firmware? Yes, it is possible. oscilloscope picture of tach signal [1000rpm 2ms/div] http://lh6.ggpht.com/_V2yrN18mN60/S_PS4XTBJeI/AAAAAAAAABQ/92vv6KwCRuQ/s640/1000rpm%202ms.JPG [1000rpm 10ms/div] http://lh6.ggpht.com/_V2yrN18mN60/S_PS4qSA1vI/AAAAAAAAABU/LK_cLQraTAA/s640/1000rpm%2010ms.JPG [3000rpm 2ms/div] http://lh3.ggpht.com/_V2yrN18mN60/S_PS5fHudxI/AAAAAAAAABY/3n4bFhhVjsE/s640/3000rpm%202ms.JPG Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.