Originally Posted by ac7ss
The brake pedal has 2 switches, taillight and Autostop. My theory is that if you place an override switch on the Autostop switch (NC when pedal up, so it would have to be a NC momentary in series with the switch) it should give you autostop as if the brakes were applied.
Has anyone done this with a CVT? Is it that simple or do you have to wire the taillight switch as well? Does it give you regen?
You can tap into the brake pedal switch but when you activate your switch, AutoStop will not happen until your vehicle speed goes to 4MPH or below. It is just like pressing lightly down on the brake pedal though.
The MT models can be forced into an Auto Stop (called FAS). This is really a forced eninge stall by the push of a button. The FAS mod cuts off the power to the fuel injectors so the engine stalls when you push the switch. The MT is able to restart under several conditions using the IMA including just pressing down on the gas pedal. The FAS seems to work well with MT owners.
However, there are problems trying to do a FAS mod on CVT Insights. Those problesm have to do with the CVT design and I will list a few issues:
1) The CVT normally AutoStops at speeds 4MPH or below. The reason is to place the belt / pulley in the proper ratio for low speed take off upon the next restart.
2) the engine to be running (rotating) in order to adjust to the proper ratio before going into an AutoStop.
3) The start clutch will only disengage around the 4MPH area.
If you tried a FAS mod at speeds say 10 MPH and above, the CVT has no way to change the belt position to the proper ratio of where you want to restart.
Many of the CVT functions use hydraulic pressure and with no engine running due to a FAS, the start clutch does not disengage properly and actually feels very abnormal.
I have tried some of this stuff earlier to see if FAS could actually work in a CVT but found that it would probably cause damage to the CVT under long term conditions.
So, what I decided to do next was to fool the computer into doing REAL
AutoStops at low speed. As you may know, if you are stuck in traffic or the drive-thru, you can not get another AutoStop from an unmodified CVT Insight until you travel at least 8 MPH or more then you will go into AutoStop the next time you come to a stop. In stop and go traffic and the drive-thru, you normally can't get back up to the 8MPH set point before you have to stop again so you end up wasting gas the next time you come to a stop.
I created what is called the Low Speed Auto Stop (LSAS) controller that will fool the computer into thinking that have exceeded the 8MPH set point only for a split second (even if you only really have been going 3MPH) and when you press your foot on the brake again and come to a stop, the CVT Insight will automatically go into another AutoStop. This cycle continues without the need to press any buttons....It is all automatic so you don't have to think about it.
I posted a lot of information about the LSAS when it was first being constructed here:
Automatic Low Speed Auto Stop
I have sold some of these to forum users in the past and I have been recently asked how much does it cost to build some more. The original price was $250 because I spent tons of time manually creating solder traces on a very small PCB and took several days to complete. Within the past month or so, I have discovered how to use presensitized PCBs and now I am able to create a circuit board with etched traces in much less time. What used to take about 4 days can be now done in about one long day once I have all of the parts.
I can now offer these LSAS controllers pre-built and tested for $85 plus shipping for CVT Insight forum members (I'm not ignoring MT onwers but you guys already have a method to do the same thing and purchasing my controller would be redundant). For anyone interested, I will create a post in the Buy / Sell section to purchase one of these controllers.
JoeCVT = Just your average CVT owner