View Single Post
Old 09-28-2013, 10:58 AM   #1 (permalink)
Daox
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,143

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,451
Thanked 2,504 Times in 1,512 Posts
Installed a coolant temp spoofer on the Prius

What is a coolant spoofer you might ask? Well the Prius goes through 4 warm up stages before you can get it to turn off the engine every time like you'd like to do. Most of the stages are controlled by the coolant temperature. So, this little circuit tells the ECU that the engine is warmer than it really is to get you through the warmup process quicker. Also, if you have the heat turned on in the Prius, depending on the coolant temp, it will keep your engine running or not. So, the coolant temp spoofer basically allows for more engine off operation.

The coolant spoofer I got was from ccdisce over on Priuschat. Its a custom board he designed to do the job, and he now sells them.

Here is the kit contents.






Here is the little tiny spoofer board. Its only about as wide as a quarter.




To install it you remove the glove box to access the ECU wiring behind it. You only have to hook up three wires: power, ground, coolant temp. So, its very simple. Mine was even easier because I already had the wires hooked up to wiretaps from the arduino board.





Here we go, all "installed". It'll probably stay that way just giving company to my EV switch and ipod.





I only just installed it on Thursday night (2 days ago), but I did notice on the way to work on Friday I was able to get my engine to shut off earlier than before. I'm not sure how this will translate to mpg, but at the very least I should be able to use my heater a bit more in winter and that would be quite nice.

Attached Thumbnails
Click image for larger version

Name:	prius 003.JPG
Views:	1309
Size:	64.7 KB
ID:	13829   Click image for larger version

Name:	prius 002.JPG
Views:	1298
Size:	64.4 KB
ID:	13830   Click image for larger version

Name:	prius 004.JPG
Views:	982
Size:	62.9 KB
ID:	13831   Click image for larger version

Name:	prius 005.JPG
Views:	1334
Size:	68.7 KB
ID:	13832  
__________________
Current project: A better alternator delete
  Reply With Quote
The Following 2 Users Say Thank You to Daox For This Useful Post:
jeff88 (09-28-2013), Piwoslaw (09-30-2013)