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Old car guy.....
 
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Inertia Switch

I picked up an inertia switch from https://www.pegasusautoracing.com/productdetails.asp?RecID=87 and plan to install it since my air meter switch circuit is not wired and the fuel pump could continue to run in an accident. Has anyone installed one of these? Where did you mount yours?
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Steve
1981 SC Steel Widebody, DP Lid, 930/51 to 3.2l, K27 7006 Turbo, DOD, P&P Twin Plug heads, Twinfire Ignition, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, 044 pump, BLwur, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters
2003 BMW Z4 Daily Driver & Autocross car.

Last edited by Hot Euro; 02-16-2017 at 04:15 AM..
Old 02-15-2017, 04:32 PM
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BigTim
 
Join Date: Mar 2013
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I have not installed one on my Porsche, but I have installed one on the electric fuel pump in my 32 Ford, and I have one installed on MY Factory 5 Cobra. They can be tested by hitting the frame with a hammer. I also installed roll over shut off switches. I pick these items up at the u-pull it junk yard mostly from Ford products.
HTH
Tim
Old 02-15-2017, 04:56 PM
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I'm not sure I'd run all the power for the fuel pumps through it. Check the switch rating. I think that's a 25A circuit. I'd use it to interrupt the ground side of a relay.
Old 02-16-2017, 08:32 AM
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Quote:
Originally Posted by flightlead404 View Post
I'm not sure I'd run all the power for the fuel pumps through it. Check the switch rating. I think that's a 25A circuit. I'd use it to interrupt the ground side of a relay.
Your right. I went back and read it again:10 Amp continuous load rating allows the switch to handle the current of most electric fuel pumps (such as Facet low-pressure pumps) directly. Fuel pumps drawing 10 amps or more (such as the Bosch 044 and Aeromotive A1000 pumps) should use this switch to break contact on the fuel pump relay coil circuit.
So yes, this will be the plan.
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1981 SC Steel Widebody, DP Lid, 930/51 to 3.2l, K27 7006 Turbo, DOD, P&P Twin Plug heads, Twinfire Ignition, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, 044 pump, BLwur, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters
2003 BMW Z4 Daily Driver & Autocross car.
Old 02-16-2017, 08:46 AM
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you could still wire it to the gnd side of the FP relays.
if you have the boost pressure switch you can wire it in series with that
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Old 02-16-2017, 09:45 AM
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Quote:
Originally Posted by T77911S View Post
you could still wire it to the gnd side of the FP relays.
if you have the boost pressure switch you can wire it in series with that
I agree with this. Switches s/b low amp circuits that control power to the suitably rated relay that controls the high current pump circuits(s). Inertia, air flow, and overboost switched can be inserted between relay coil and ground.
Old 02-16-2017, 11:58 PM
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Quote:
Originally Posted by T77911S
you could still wire it to the gnd side of the FP relays.
if you have the boost pressure switch you can wire it in series with that

Quote:
Originally Posted by flightlead404 View Post
I agree with this. Switches s/b low amp circuits that control power to the suitably rated relay that controls the high current pump circuits(s). Inertia, air flow, and overboost switched can be inserted between relay coil and ground.
This looks like the best way to go. Since I have no overboost relay and only 1 fuel pump relay I just need to find the best place to splice into the fp relay ground (85) wire. I have also been looking for the best place to mount the switch. I really wanted this in the passenger compartment but the kick panels have thick carpet that I don't think I want to disturb. I was looking on the passenger side of the frunk where there is a clear vertical area. This is over the right front wheel area which might be a problem. Still looking, any advise?
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1981 SC Steel Widebody, DP Lid, 930/51 to 3.2l, K27 7006 Turbo, DOD, P&P Twin Plug heads, Twinfire Ignition, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, 044 pump, BLwur, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters
2003 BMW Z4 Daily Driver & Autocross car.
Old 02-17-2017, 05:20 AM
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I put mine in the smugglers box. It was easy to cleanly route the wiring and there was a nice flat surface to work with.
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Old 02-18-2017, 08:51 AM
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Quote:
Originally Posted by Ayles View Post
I put mine in the smugglers box. It was easy to cleanly route the wiring and there was a nice flat surface to work with.
Sounds like a good idea, wouldn't get tripped by accident, too bad my smuggler's box is full with the ac evaporator.
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1981 SC Steel Widebody, DP Lid, 930/51 to 3.2l, K27 7006 Turbo, DOD, P&P Twin Plug heads, Twinfire Ignition, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, 044 pump, BLwur, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters
2003 BMW Z4 Daily Driver & Autocross car.
Old 02-18-2017, 11:58 AM
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Quote:
Originally Posted by Ayles View Post
I put mine in the smugglers box. It was easy to cleanly route the wiring and there was a nice flat surface to work with.
How did you wire yours in? I was going to pull the fuse box away from the fender and splice into the fp relay ground unless I find a better way.
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Steve
1981 SC Steel Widebody, DP Lid, 930/51 to 3.2l, K27 7006 Turbo, DOD, P&P Twin Plug heads, Twinfire Ignition, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, 044 pump, BLwur, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters
2003 BMW Z4 Daily Driver & Autocross car.
Old 02-19-2017, 04:34 AM
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Mine is wired in at where the fuel pump relay is on an SC. I have carbs so it's wired like an older car, pump runs with key on. Hence the need for an inertia switch. I made a nice harness for it using shrink tube and expandable sheathing.
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Old 02-19-2017, 10:30 AM
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