ECU Inputs

1. Alexywhite Infrequent Poster Joined: Jul 2009 Oxford Posts: 222 Citroen Saxo VTR MK2 DC2 Integra Type R EP3 Civi

   #1 24th February 2011, 17:42

   Hi Guys,
   
   Does anyone here know how the standard ECU will behave if only run with a throttle position sensor to calculate load?
   
   I think that it will just discard the other sensors (air temp and manifold pressure) if they do not correlate with the TPS. Is this right?
   
   Any knowledgeable input will be greatly appreciated.
   
   Alex
2. ryanmt Established Member Joined: Oct 2004 Warrington Posts: 1987 AX VTS 57 3.0 TDI A5

   #2 24th February 2011, 18:22

   wont run properly without the map sensor
   
   Why are you wanting to remove engine sensors. They are there for a reason!
3. Alexywhite Infrequent Poster Joined: Jul 2009 Oxford Posts: 222 Citroen Saxo VTR MK2 DC2 Integra Type R EP3 Civi

   #3 24th February 2011, 18:58

   Indeed they are. But I am planning on running some ITBs. I have designed a manifold and have some bodies. I am just doing it as a bit of a laugh. That means not spending loads of money on programable management.
   
   Does the ECU not just discard the MAP sensors voltage if it doesnt correlate well with the TPS?
   
   Thanks for the reply.
4. user_15989 Saxperience Forum Bum Joined: May 2007 Posts: 4857

   #4 24th February 2011, 19:16

   You can remap the standard ECU so you can run using primarily TPC and RPM signals. Not as easy as it sounds though. You can build a DIY ECU and map this your self. Again not as easy as it sounds but for most easier then mapping the original ECU. It is a great project to learn about cars and tuning.
5. Alexywhite Infrequent Poster Joined: Jul 2009 Oxford Posts: 222 Citroen Saxo VTR MK2 DC2 Integra Type R EP3 Civi

   #5 24th February 2011, 19:20

   Okay. Would it not be easier to program a microcontroller of some kind to replicate the voltage that the MAP sensor should produce at a certain engine load?
6. user_15989 Saxperience Forum Bum Joined: May 2007 Posts: 4857

   #6 24th February 2011, 19:43

   You could use a piggyback ECU to trick the ECU in to giving the results your after yes. GMC used to do something similar for turbo applications with there SigCon 2 and 3. The biggest hurdle you get is that even when you produce a virtual MAP signal map your engine is still substantially out of original spec that getting it to run well will likely still be a tricky job. You would likely have to alter other load signals to get the desired results. It may prove harder to get good results from making a piggyback ECU to trick the OEM ECU in to doing what you want then to just build a complete ECU. You can always give it a go though. I would be interested to see how it goes