One for you Electrical gods!

I have a Lotus Elise S1 dash in my car, i have connected the tach, lights...ect but need a little help with the speedo and water temp?

Here is the info i got from Stack

Item Ref Description Elise Iss 1
ST990084
Pins [IMAGE] [IMAGE] [IMAGE]
A1 Batt Permanent batterysupply Batt
A2 Gnd Permanent Ground supply Gnd
A3 Ign Ignition. Switched battery supply Ign
A4 ESpd Engine Speed (RPM) signal ESpd
A5 WSpd Vehicle (Wheel) Speed signal (10.1433Hz/MPH) WSpd
A6 WTmp Water Temperature signal WTmp
A7 FLev Fuel Level signal FLev
A8 SensV Sensor supply (Regulated +v) (6.25V) SensV
A9 Main Main beam lights signal Main
A10 Alt Alternator Alt
A11 IndL Indicator Left signal IndL
A12 IndR Indicator Right signal IndR
B1 Brak(e) Brake Fluid / Hand Brake Brak(e)
B2 Hand / AirBag Hand Brake / Air Bag Hand
B3 OilP Oil Pressure low signal OilP
B4 Air Bag / SB Air Bag / Seat Belt signal Seat Belt
B5 Cat/EC Cat overHt / Engine Check signal Cat
B6 SL Side Light signal SL
B7 N.C. N.C. N.C.
B8 N.C. N.C. N.C.
B9 Illum Illumination control & Trip reset Illum
B10 AL/CL/RFog Alarm / Coolant level / Rear Fog signal Alarm
B11 Door Door open signal NC
B12 ABS ABS system inoperative signal NC

Does the water temp have to have a +v feed
Also how do i make 10.1433Hz/MPH? I think the std elise uses an abs sensor.. but not 100% sure

I suck at electrics

water temp is usually a resistance to earth, but i seem to be recall the speed signal on the K series elise was from the ECU originally

hth

Ray

quote:

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Originally posted by FlansS14

Also how do i make 10.1433Hz/MPH?

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And what is your rolling tyre circumference?

Measure this in metres (mine is about 1.795m for a 195/50/R15). Multiply this number by 22.69 to give the number of pulses per revolution of the wheel.

(22.69 is the number of pulses per metre as calculated by 36515/1609).

In my example, this would require approx 41 pulses per wheel revolution. Maybe someone like TriggerWheels would be able to make something suitable?

Ed.


[Edited on 5/5/10 by Madinventions cos I can't type. ]

[Edited on 5/5/10 by Madinventions]

Or divide it down by your final drive ratio and put the sensor on the propshaft.

Yeah - I keep forgetting about propshafts! (my engine is at the back...)

Cheers guys, I think i have 235/50/15 but they could be 225/50/15... ill go measure.

Would any abs sensor work? does this have to be earthed one side or powered one side?

Stuart

Yellow box / speedohealer will enable you to get the pulses right.

The dash is expecting the output from a hall sensor that gives a nice clean pulse train. A standard Variable Reluctance ABS sensor will not work.

quote:

---

Originally posted by Madinventions
And what is your rolling tyre circumference?

Measure this in metres (mine is about 1.795m for a 195/50/R15). Multiply this number by 22.69 to give the number of pulses per revolution of the wheel.

(22.69 is the number of pulses per metre as calculated by 36515/1609).

In my example, this would require approx 41 pulses per wheel revolution. Maybe someone like TriggerWheels would be able to make something suitable?

Ed.


[Edited on 5/5/10 by Madinventions cos I can't type. ]

[Edited on 5/5/10 by Madinventions]

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This is the std Elise sensor?

http://www.eliseparts.com/products/show/61/833/wheel-speed-sensor/

are these different to ABS sensors. I just thought they might use the 44t ABS ring from the rover driveshaft as an imput for the ecu. could be totaly wrong though

Apparently the elise sensor sends a sinewave +/- 12v

so not an ABS sensor?

Actually you might be ok with a VR sensor. I collected a load of information on this some time ago to use a Lotus dash, but I just noticed that the diagram I have is for a 26 pin connector which shows separate pins for the hall effect sensor supply, signal and ground. The 24 pin you are showing is totally different.

+-12v is quite possible from a VR sensor at higher speeds.

Thanks Mike,

any ideas where i can pick one up from?

Stuart