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neutral safety switch

Home / the12volt's Install Bay / Car Security and Convenience / neutral safety switch (Topic Closed Topic Closed)
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audioinstaller3 
Copper - Posts: 59
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Joined: June 22, 2008
Posted: August 26, 2008 at 10:37 AM / IP Logged  
I want to build my own. I know this is a topic that will prob. get deleted. But if someone bypasses their alarm on a manual car, why not figure out a way to make it safe. The only thing I can think of is sticking a mercury switch on the bottom of the shifter under the car. Maybe then when its in neutral cause it will be straight it will work, and if its in 1st gear it will be angled and not allow remote start? Any ideas would be helpful. But I know the rules.
KPierson 
Platinum - Posts: 3,527
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Posted: August 26, 2008 at 2:56 PM / IP Logged  

A magnetic switch wouldn't work well because you would always have to park on flat ground.  If you parked on a slight angle and left the car in reverse it could make the murcury switch.

Magnetic switches are popular to use, put the magnet on the bottom of the shifter shaft and permanently mount the switch so that it lines up in Neutral.

I always wanted to build an IR switch - put two IR transmitters on one side of the shifter and put two recievers on the other side so that they line up.  Set one pair to shoot across 1-3-5 and the other to shoot across 2-4-6-R.  If either of the two sensors is blocked then don't let the car start.  If they are both made prevent the car from starting.

The last idea I have would be to open up the actual tranny and mount a switch inside it near the "reverse" switch (like Nissan has been doing for years).  This would be very labor intensive and not cheap at all, but it would be the "best" way to do it.

Kevin Pierson
audioinstaller3 
Copper - Posts: 59
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Posted: August 26, 2008 at 9:06 PM / IP Logged  
How do the factory cars usually do it? Cause I know their are manual cars out their that have the neutral safety switch?
KarTuneMan 
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Posted: August 26, 2008 at 10:41 PM / IP Logged  
Use a DEI 689M
JWorm 
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Posted: August 27, 2008 at 12:45 AM / IP Logged  
audioinstaller3 wrote:
How do the factory cars usually do it? Cause I know their are manual cars out their that have the neutral safety switch?
There are quite a few manual cars that have neutral switches. I would trust them over a 689m anyday. I feel a 689m is more likely to malfunction than a switch mounted in the transmission from the factory. You can reach in the window, put the car in gear, and the car will remote start in gear. A door pin could go defective making it possible to malfunction as well. Would not happen if you are able to tap into a factory neutral switch wire. Most Subaru's have them, most Nissans have them, my Mazda Speed3 has one. I have heard of some Fords having them too. Honda/Acura definately does not have one.
KPierson 
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Posted: August 27, 2008 at 6:01 AM / IP Logged  

audioinstaller3 wrote:
How do the factory cars usually do it? Cause I know their are manual cars out their that have the neutral safety switch?

KPierson wrote:
The last idea I have would be to open up the actual tranny and mount a switch inside it near the "reverse" switch (like Nissan has been doing for years).  This would be very labor intensive and not cheap at all, but it would be the "best" way to do it.

They use a switch similar to the "reverse" switch mounted in the transmission.

Kevin Pierson
reax222 
Copper - Posts: 220
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Posted: August 27, 2008 at 7:28 AM / IP Logged  
Have you thought about a line lock type solenoid on a hydraulic clutch? Perhaps install a check vavle so pressure can not flow back to the reservoir and install a solenoid in parallel that is only open when the key is on? Then if you had to add a safety to it, a pressure switch would do, as long the slave cylinder is pressurized, it's out of gear.

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