vehicle speed sensor Q

88chevota · 08-10-07, 02:46 PM

I have a chevy 350 TBI which had a 700R4 behind it, so I needed to intsall a vehcile speed sensor. I assumed that was for the tranny and to calibrate the shifting, But I have assumed before and that makes me an... well I think you know.

Now I am putting in a manual trans so my question is..

Do I still need the vehicle speed sensor for the fuel delivery system?

And do I ground the park neutral switch so it stays in open or closed loop or whatever it is supposed to be?

Isotel · 08-10-07, 03:24 PM

Tony, VSS on TBI only helps out a bit by helping lock up the TQ converter and slight fuel adjustments depending upon actual vehicle speed.. Many Run without one on TBI with no issues.. mine is currently disconnected..

im sure you Cross the Park Neutral Switch wires without a vss

Dynosoar · 08-10-07, 04:31 PM

On TBI setups I think you need it for low speed (less than 5mph?) and for idle setup, as well as cold start.

Dynosoar

Tapage · 08-10-07, 04:43 PM

I know also somu buddyes that run 700R4 without this VSS and no dramas .

Isotel · 08-10-07, 04:45 PM

Yes it helps, but you don't "need" it..

How are you running you speedometer? you may be able to have a speedo shop make an adapter from the 205 to the toyota input on your old VSS..

I had Jags that run build me one that adapted the dana 300 to the toyota Speedo Cable

BiffS · 08-11-07, 12:01 PM

Downey sells some versions that can be incorporated into your various Tcases.

just did a V6 4.3 Vortec from a 2003 Auto into a Toy 5 speed. had to get Fuelinjection.com to remove the VATS and they did a bunch of other stuff too, but they kept the VSS which was used for idle down, decelration fuel cut, A/C Idle up, and 1st gear high demand A/C compressor shut down, as well as to "reference" the other sensors at idle.

If you get someone to flash the brain, it's a good idea to have the VATS, 3rd o2 sensor, neutral start switch, and the MFI interface.

leaving the VSS off will trigger a check engine and may also trigger a rich fuel setting ( o2 sensors turned off, full enrichment).

P.S. Anyone know how many pulses per mile that an Audi 2.8 needs? I don't have a VSS in my rig and it's definitely not happy.

08-10-07, 02:46 PM	#1
88chevota IH8MUD Regular Join Date: Jun 2006 Location: Colorado Springs, CO Posts: 458	vehicle speed sensor Q I have a chevy 350 TBI which had a 700R4 behind it, so I needed to intsall a vehcile speed sensor. I assumed that was for the tranny and to calibrate the shifting, But I have assumed before and that makes me an... well I think you know. Now I am putting in a manual trans so my question is.. Do I still need the vehicle speed sensor for the fuel delivery system? And do I ground the park neutral switch so it stays in open or closed loop or whatever it is supposed to be? __________________ 1988 FJ62 - Chevy 350 TBI, SM465 tranny, NP205 t-case, cruiser/minitruck hybrid rear axle, SOA, shackle reversal, 35" Maxxis Bighorns, 14" travel shocks all around. check out the build. All done!!! http://forum.ih8mud.com/60-series-wagons/164109-chevota-gets-makeover.html 1997 FZJ80 - Collector's Edition (wife's)

08-10-07, 03:24 PM	#2
Isotel IH8MUD Lifer Join Date: Sep 2003 Location: Crawlorado.com TLCA# 16898 Posts: 3,026	Tony, VSS on TBI only helps out a bit by helping lock up the TQ converter and slight fuel adjustments depending upon actual vehicle speed.. Many Run without one on TBI with no issues.. mine is currently disconnected.. im sure you Cross the Park Neutral Switch wires without a vss __________________ 1976 FJ40 TBI350 700R4 D300 SOA Locked 37" PBR's Protected by REDLINE Colorado Land Cruisers - Club Redline Land Cruisers - PM me for info on our products or to order! CrAwLoRadO.com

08-10-07, 04:31 PM	#3
Dynosoar V8J60 - TPI Join Date: Feb 2006 Location: SoCal TLCA# 17857 Posts: 1,742	On TBI setups I think you need it for low speed (less than 5mph?) and for idle setup, as well as cold start. Dynosoar __________________ '82 V8J60 - TPI 350 with a Turbo 400 attached to a splitcase, Cable Locker FF rear end, 4" SUA (National Spring), Copper Metalic Has been south to Cabo San Lucas, BCS and North to Port Angels,WA. Call Sign: KI6SMP

08-10-07, 04:45 PM	#5
Isotel IH8MUD Lifer Join Date: Sep 2003 Location: Crawlorado.com TLCA# 16898 Posts: 3,026	Yes it helps, but you don't "need" it.. How are you running you speedometer? you may be able to have a speedo shop make an adapter from the 205 to the toyota input on your old VSS.. I had Jags that run build me one that adapted the dana 300 to the toyota Speedo Cable __________________ 1976 FJ40 TBI350 700R4 D300 SOA Locked 37" PBR's Protected by REDLINE Colorado Land Cruisers - Club Redline Land Cruisers - PM me for info on our products or to order! CrAwLoRadO.com

08-11-07, 12:01 PM	#6
BiffS IH8MUD Regular Join Date: Oct 2005 Location: Vancouver, B.C> Posts: 282	Downey sells some versions that can be incorporated into your various Tcases. just did a V6 4.3 Vortec from a 2003 Auto into a Toy 5 speed. had to get Fuelinjection.com to remove the VATS and they did a bunch of other stuff too, but they kept the VSS which was used for idle down, decelration fuel cut, A/C Idle up, and 1st gear high demand A/C compressor shut down, as well as to "reference" the other sensors at idle. If you get someone to flash the brain, it's a good idea to have the VATS, 3rd o2 sensor, neutral start switch, and the MFI interface. leaving the VSS off will trigger a check engine and may also trigger a rich fuel setting ( o2 sensors turned off, full enrichment). P.S. Anyone know how many pulses per mile that an Audi 2.8 needs? I don't have a VSS in my rig and it's definitely not happy. __________________ Sans Leaves. . . Link it don't leaf it! Project ToyAudi: Daily driver duty for a while:Audi 2.8 in a FJ 40. DD for the Mrs.: PZJ77V RHD for hauling cargo.

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