how important is this sensor??

LX XLR8R · 08-03-2001, 11:01 AM

right now i have no wires hooked up to my tranny sence the 4 banger swap..will this effect anything???

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1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..
AIM=onesillynotch

84_GT350 · 08-03-2001, 12:22 PM

If memory serves, there shouldn't be any wires hooked up to it unless it's an AODE. Just some cables/hoses.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

BlackFly · 08-03-2001, 12:30 PM

There are two possible connectors there, one is right where the speedo comes out of the tranny, thats for cruise i beleive, the other is on top, its a two wire connector and its for fifth gear acknowledgement, it limits your rpm to 3800 in fifth , without it , you are top speed limited only by power, or the rev limit of 6250. without that one, who cares , the other , probably your cruise will not work.

jimberg · 08-03-2001, 01:31 PM

There is no fifth gear rev limit. I don't know if you are aware of this, but the orange line on your Tach is the red line for 5th gear. That would be 4900 rpms, not 3800. I can also tell you from experience that I have been well over 3800 in 5th gear. There is only one rev limit, and that's the 6250 rpm one.

That's the neutral safety switch you're talking about. The speed sensor coming from the speedometer cable is also important for the computer to know that you are still moving. This is what keeps your RPMs up until you come to a complete stop. If your RPMs aren't kept up, your car could stall if you had to brake hard without depressing the clutch.

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351W 89 Mustang GT Convertible

[This message has been edited by jimberg (edited 08-03-2001).]

08-03-2001, 11:01 AM	#1
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	how important is this sensor?? right now i have no wires hooked up to my tranny sence the 4 banger swap..will this effect anything??? ------------------ 1987 black notch(ex 4 banger) DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one.. AIM=onesillynotch

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08-03-2001, 12:22 PM	#2
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	If memory serves, there shouldn't be any wires hooked up to it unless it's an AODE. Just some cables/hoses. ------------------ 1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

08-03-2001, 12:30 PM	#3
BlackFly Registered Member Join Date: Feb 2001 Location: winnipeg , manitoba , canada Posts: 83	There are two possible connectors there, one is right where the speedo comes out of the tranny, thats for cruise i beleive, the other is on top, its a two wire connector and its for fifth gear acknowledgement, it limits your rpm to 3800 in fifth , without it , you are top speed limited only by power, or the rev limit of 6250. without that one, who cares , the other , probably your cruise will not work.

08-03-2001, 01:31 PM	#4
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	There is no fifth gear rev limit. I don't know if you are aware of this, but the orange line on your Tach is the red line for 5th gear. That would be 4900 rpms, not 3800. I can also tell you from experience that I have been well over 3800 in 5th gear. There is only one rev limit, and that's the 6250 rpm one. That's the neutral safety switch you're talking about. The speed sensor coming from the speedometer cable is also important for the computer to know that you are still moving. This is what keeps your RPMs up until you come to a complete stop. If your RPMs aren't kept up, your car could stall if you had to brake hard without depressing the clutch. ------------------ 351W 89 Mustang GT Convertible [This message has been edited by jimberg (edited 08-03-2001).]