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07-16-2023, 03:06 PM | #1 |
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2 step & pressure switch
Has anyone ever had an issue with your 2 step not turning off clean during the launch?
I have developed a studder during the launch. It shows the O2's going rich almost like it's a ignition thing. |
07-16-2023, 06:29 PM | #2 |
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Re: 2 step & pressure switch
I assume you have a data recorder in the car. We bring the
12v signal from the pressure switch / 2 step into a digital input Then you can see the 12 v drop and rpm increase. Our O2 sensor goes rich on the hit also.I assumed it has to do with the vacuum secondary in the carb David |
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07-17-2023, 10:46 AM | #3 | |
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Re: 2 step & pressure switch
Quote:
Steve Teeter. Stk/SS 620 |
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07-17-2023, 11:21 AM | #4 |
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Re: 2 step & pressure switch
David, I do have a Racepak. I will order the 12 volt event sensor.
Steve, good point. I will change it out while I'm at it. Thanks, Mike |
07-17-2023, 03:42 PM | #5 |
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Re: 2 step & pressure switch
Some pressure switches have buna type o-rings or wetted parts. Buna rubber is not compatible with brake fluid. EPDM rubber is compatible with brake fluid. Virtually all brake o-rings, seals, etc are edpm rubber. Not sure as to what extent that has with the switch, but I know one person who had a switch go bad and his had buna rubber parts.
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07-19-2023, 06:29 PM | #6 |
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Re: 2 step & pressure switch
I get your using brake pressure switch but are you using one in conjunction with a button on the brake pedal. If you are that's the first thing I would get rid of.
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07-24-2023, 10:04 AM | #7 |
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Re: 2 step & pressure switch
What is the switch to buy?
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08-03-2023, 08:52 PM | #8 |
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Re: 2 step & pressure switch
Call Folk Race Cars. They sell what's called the Ultimate Brake Pressure Switch. Easy to adjust to different brake PSI requirements. Two wires.
( Has three but the black wire is not used). 150.00?. Steve Teeter Stk/SS 620 |
08-04-2023, 11:23 PM | #9 |
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Re: 2 step & pressure switch
What brake fluid are you using with these switches?
Thanks, Mike |
08-04-2023, 11:37 PM | #10 |
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Re: 2 step & pressure switch
I'll have to dig up the part # but I just use a 2 wire brake pressure switch that has pipe threads. Listing is probably for and old Ford car.
Just found my spare switch, it's an S194 from Carquest. Last edited by Eman; 08-07-2023 at 11:16 AM. |
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