Josh@PremierAutosports

iTrader: (11)

I'm looking for a pressure switch for Propane. I need something around 150-170psi with the smallest working window I can find. 160 +/- 5 degrees would be great. Or doesn't anyone else have a different idea how to regulate propane pressure.

Nitro Dave's Nitrous Outlet

iTrader: (25)

This is a good area for Al.. I know he will have the answer.
Dave

Robert56

iTrader: (2)

The NOS bottle heater uses thermastatic control and will heat your propane bottle to just the right temp and to about 160psi, it does this with 85* thermastats. It's the best most effective way for propane use. standard way as far as I know. Do a search on propane and you will find a thread with more propane info than any where else. Good luck, and you can pm me on any propane tech.
Robert

Josh@PremierAutosports

iTrader: (11)

Won't pressure change much with just a thermostat as propane weight drops?

Robert56

iTrader: (2)

I forget the exact amount, but you'll see very little change in pressure at 85*. also you'll fill your nitrous bottle, many, many, many times before a refill is needed on your propane bottle, so pressure drop is so slow and mild, as to be a non issue.
Robert

Josh@PremierAutosports

iTrader: (11)

I got a NOS warmer and if I put the thermostat 180 degrees from the warmer mounted between the velcro and the bottle pressure gets over 200. If I put the thermostat behind the warmer pressure only gets to 130. I guess I'll keep playing with placement to get me in the 160 range.

Robert56

iTrader: (2)

That seems very strange. Eighty five degrees is 85*, and it should shut down. I have mine under the straps and it heats it to right where it should be, call NOS tech, maybe you have a faulty thermastat. Also, with propane you have a large window of tuning, meaning a propane jet of one size will be used for a wide range of hp (and only changing n2o jet). This can be seen in the bottle temps, with the middle ground of the jet list i have given in the past being at approx 160psi. So, if your a little bit above or below it won't really matter. Check your a/f by scanning to see for sure.

Josh@PremierAutosports

iTrader: (11)

I have my car setup for 150-165psi and with the pills I'm running dyno at 660/880 with high 11's AF. I'm just trying to get the pressure to stay consistant so I don't have to play with it every pass. Do you have your thermostat under the warmer or the strap? Does yours have 2 thermostats that you wire together?

Robert56

iTrader: (2)

Two stats and under strap.
Robert

DynotuneN2O

iTrader: (13)

We use to sell a heater kit made for the Propane tank that used a pressure transucder.
Real acurate, adjustable....Very slick.....Bad news is that we sold like two......LOL
Yes really.......We have not made one in about 4 years!

Wish I had one laying around.....

Dan

Josh@PremierAutosports

iTrader: (11)

Can you still get the pressure transducer or point me in the right direction.

DynotuneN2O

iTrader: (13)

We were using our Nitrous pressure Gauge sending unit. Problem is that the sending unit uses very small voltages. Checkout MSI sensor in allied electric? I think they make a pressure sensor that will work with the propane. Problem is that the propane needs to use a fully sealed sesnor so a spark does not happen. They probably sell a pressure sensor with linear output @ 0-5V
You would need a circuit to control the heater...Not that easy to do...

Dan