Adding a Honeywell Hobbs switch

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Adding a Honeywell Hobbs switch

Unread postby dleach1407 » Fri Sep 25, 2020 11:11 pm

Ive been working on my getting my fuel system upgraded for the last few weeks and am getting ready to wire in the second pump using a hobbs switch and 30a relay. Ive been looking at placement and came to the conclusion the IAT port on the #5 intake runner would be the most convenient place to mount the switch. Im worried with it being in a runner close to the valve there could be some issues detecting boost. The way my intake sits combined with the AC lines i cant fit it behind the intake. The only other option is adding a vacuum tree which will be what I will do if this location isnt going to work. Thoughts?

Also, When you do a regulator in the back with just the feed going forward, do you run vacuum to the regulator or do you leave it without a reference and bump up the pressure?
dleach1407
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Posts: 262
Joined: Fri Sep 07, 2018 10:13 pm
Vehicle Information: 1995 Mustang T5 CBAZA/T4M2 Moates QH BE or TpRT
331 10.2:1 compression, TFS 11r 190 56cc heads
HPX MAF 3.25 OD tube with SaxonPC air straightener
F303 Cam, 1.6 trickflow rockers
T5 with an XTD clutch that somehow holds my power
Returnless upgrade w/10an supply
BBRC offset fuel rails
03 cobra tank w/on3 triple hat, 80lb Dekas
Minor upgraded T5 with counter gear stiffening plate
76mm On3 turbo, HP hotside, Custom coldside
560WHP and 606TQ 8lbs tapering to 6 91 octane
27degrees total timing.
Other Vehicle(s): 1957 Ford F100
Mustang II front suspension -done
C-notched rear frame - done
Luxury ECU using RZASA - have
Fuel injected explorer 302 - have
4r70W -have

Lots of stuff planned including air bags and twin 55mm turbos.

Re: Adding a Honeywell Hobbs switch

Unread postby dleach1407 » Fri Sep 25, 2020 11:27 pm

I should note that I do not use this port and it is currently blocked off. I am using the MAF IAT function.
dleach1407
A+ Contributor
 
Posts: 262
Joined: Fri Sep 07, 2018 10:13 pm
Vehicle Information: 1995 Mustang T5 CBAZA/T4M2 Moates QH BE or TpRT
331 10.2:1 compression, TFS 11r 190 56cc heads
HPX MAF 3.25 OD tube with SaxonPC air straightener
F303 Cam, 1.6 trickflow rockers
T5 with an XTD clutch that somehow holds my power
Returnless upgrade w/10an supply
BBRC offset fuel rails
03 cobra tank w/on3 triple hat, 80lb Dekas
Minor upgraded T5 with counter gear stiffening plate
76mm On3 turbo, HP hotside, Custom coldside
560WHP and 606TQ 8lbs tapering to 6 91 octane
27degrees total timing.
Other Vehicle(s): 1957 Ford F100
Mustang II front suspension -done
C-notched rear frame - done
Luxury ECU using RZASA - have
Fuel injected explorer 302 - have
4r70W -have

Lots of stuff planned including air bags and twin 55mm turbos.

Re: Adding a Honeywell Hobbs switch

Unread postby decipha » Sat Sep 26, 2020 12:33 am

it should be fine there

no reference pressure bumped to 65psi or so depending on my needs. You will need to install a pressure damper on the fuel rail. More info in the pre tune info.
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decipha
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Other Vehicle(s): Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer
06 Chrysler 300 AWD - Sharifa

Re: Adding a Honeywell Hobbs switch

Unread postby dleach1407 » Sat Sep 26, 2020 7:41 am

I will order a 20-0177 FPD-XR today. I wasnt aware I needed that. I only need one correct? My fuel rails are fed from the rear and capped on the front. Do I need an inline one instead of a rail mounted version? Will vacuum reference not work due to the distance? I assume the distance would cause a lag in pressure changes. I had originally planned on using the stock return line for reference.
dleach1407
A+ Contributor
 
Posts: 262
Joined: Fri Sep 07, 2018 10:13 pm
Vehicle Information: 1995 Mustang T5 CBAZA/T4M2 Moates QH BE or TpRT
331 10.2:1 compression, TFS 11r 190 56cc heads
HPX MAF 3.25 OD tube with SaxonPC air straightener
F303 Cam, 1.6 trickflow rockers
T5 with an XTD clutch that somehow holds my power
Returnless upgrade w/10an supply
BBRC offset fuel rails
03 cobra tank w/on3 triple hat, 80lb Dekas
Minor upgraded T5 with counter gear stiffening plate
76mm On3 turbo, HP hotside, Custom coldside
560WHP and 606TQ 8lbs tapering to 6 91 octane
27degrees total timing.
Other Vehicle(s): 1957 Ford F100
Mustang II front suspension -done
C-notched rear frame - done
Luxury ECU using RZASA - have
Fuel injected explorer 302 - have
4r70W -have

Lots of stuff planned including air bags and twin 55mm turbos.

Re: Adding a Honeywell Hobbs switch

Unread postby decipha » Sat Sep 26, 2020 8:49 am

yep just one

either will do

vac ref not needed so no point in adding all that line
if the old return line is there then yes you might as well use it for the ref
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decipha
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Posts: 20411
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Decipha Ponto
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Other Vehicle(s): Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer
06 Chrysler 300 AWD - Sharifa

Re: Adding a Honeywell Hobbs switch

Unread postby dleach1407 » Sat Sep 26, 2020 10:54 am

The return line is there so I will go ahead and just use that for reference and set the pressure to 39.5psi. Thanks for the input.
dleach1407
A+ Contributor
 
Posts: 262
Joined: Fri Sep 07, 2018 10:13 pm
Vehicle Information: 1995 Mustang T5 CBAZA/T4M2 Moates QH BE or TpRT
331 10.2:1 compression, TFS 11r 190 56cc heads
HPX MAF 3.25 OD tube with SaxonPC air straightener
F303 Cam, 1.6 trickflow rockers
T5 with an XTD clutch that somehow holds my power
Returnless upgrade w/10an supply
BBRC offset fuel rails
03 cobra tank w/on3 triple hat, 80lb Dekas
Minor upgraded T5 with counter gear stiffening plate
76mm On3 turbo, HP hotside, Custom coldside
560WHP and 606TQ 8lbs tapering to 6 91 octane
27degrees total timing.
Other Vehicle(s): 1957 Ford F100
Mustang II front suspension -done
C-notched rear frame - done
Luxury ECU using RZASA - have
Fuel injected explorer 302 - have
4r70W -have

Lots of stuff planned including air bags and twin 55mm turbos.


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