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  #1  
Old February 8th, 2012, 09:55 PM
Roverlab
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Trevor Griffiths
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VSS function

Here's what I've done:
Fit a fuel injection set-up from a 94-5 D90 onto a carbbed 89 3.5 OneTen. This car has a cable drive for the speedo and no signal generator.
What function does the VSS serve besides telling the ECU that the vehicle road speed has been exceeded and the ECU starts cutting out injectors? The Rover runs and drives with the current set-up, but it occured to me that I don't know what else the VSS may contribute, and I have a code 68.
What are your thoughts?
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  #2  
Old February 8th, 2012, 10:07 PM
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John B.
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It changes the idle mode. Idle control is faster when stopped. As you stop is raises the idle as well. Without the VSS you will have weird intermittent stalling problems when stopping.
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Old February 9th, 2012, 06:59 AM
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Trevor Griffiths
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So if I measure the resistance across a VSS and install a resistor in the harness connetors for the VSS, the ECU will recognise VSS presence, think the car is in idle mode, I just wont have a "speed limiter"?
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  #4  
Old February 9th, 2012, 08:15 AM
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After an LT230 swap on my RRC I had issues with stalling that I attributed to the VSS not being hooked up. It was a mostly off road only vehicle, so I never bothered to fix it. It would stall when coming to a stop.
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Old February 9th, 2012, 10:33 AM
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Trevor Griffiths
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Road going, need to come up with a solution. MAy just have to add a short cable and VSS.
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Old February 9th, 2012, 10:59 AM
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It's an 89 with an LT230 and a cable drive speedo from the t-case. I have a VSS on the bench, a short cable is cheap enough, and the excess of the long cable-if it fits the VSS -probably can be safely routed. Still, wondering if I could just "fake out" the ECU.....
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  #7  
Old February 9th, 2012, 11:11 AM
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Quote:
Originally Posted by Roverlab View Post
So if I measure the resistance across a VSS and install a resistor in the harness connetors for the VSS, the ECU will recognise VSS presence, think the car is in idle mode, I just wont have a "speed limiter"?
No. The VSS sends a pulse signal to the ECU. When the ECU does not get the pulse, it errors out that the VSS is broken. Normally it will then never goes into idle mode. The best solution is to install the VSS.

I just went through this last year converting a truck to EFI and it is very annoying not having the VSS installed.
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  #8  
Old February 9th, 2012, 11:29 AM
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Charles Galpin
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Trevor the 94 NAS D90 has a two piece speedo cable setup with the VSS inline so you can use those instead of trying to use the long one.
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  #9  
Old February 9th, 2012, 11:39 AM
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Trevor the 94 NAS D90 has a two piece speedo cable setup with the VSS inline so you can use those instead of trying to use the long one.
Yes, but the cable from box to speedo is NLA, as they were only used on NAS 90s, so you need to find a used one. The long cable won't work easily as the connection to the box is different.

The solution I like is to install a VDO speedo...
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  #10  
Old February 9th, 2012, 01:34 PM
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Quote:
Originally Posted by Red90 View Post
The solution I like is to install a VDO speedo...


Agree, we just put a 95 D1 eng/trans into an 83 110 and we replaced the speedo with an electronic one since it was a lot easier than messing around trying to hook up the mechanical one in the truck. VSS is the stock Disco one bolted to the T-Case and connected to the ECU. If I remember right we then took an output from the ECU (not the VSS) to drive the speedo. We used a stock LR Speedo that the owner got used but the VDO would have been better (since its programmable) and probably cheaper.
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  #11  
Old February 9th, 2012, 04:46 PM
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Actually when the VSS senses movement it raises the idle. Once the truck comes to a stop it returns to base idle. Without it the truck usually stalls when coming to a stop.
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  #12  
Old February 9th, 2012, 05:51 PM
Roverlab
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Trevor Griffiths
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Hi James! this is the fuel injection from the engine you sold to Art! We put the engine in his 110 but he wanted to stick with the carbs.

Thanks for all of the input. I have a VSS on the bench so I'll just source some cables and give it a go. I'll et you know how it goes...
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  #13  
Old February 9th, 2012, 08:16 PM
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Quote:
Originally Posted by Roverlab View Post
Hi James! this is the fuel injection from the engine you sold to Art! We put the engine in his 110 but he wanted to stick with the carbs.

Thanks for all of the input. I have a VSS on the bench so I'll just source some cables and give it a go. I'll et you know how it goes...
Awesome... lets see some pic's. I can't believe he didn't use the EFI...

You will need the VSS for it to function correctly. Either a Disco version with a pulse driven speedo or the one you have of Art's with the two cables and a mechanical speedo.
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