Lambda

r10crw · Post by **r10crw** » Fri Jul 13, 2007 9:50 am

Anyone know how the heater works on a lambda sensor. Is it on all the time? or is it ecu controlled? Havent looked at the car in the last month and thought it was time to sort out the niggling things (like the four foot flames from the exhaust

). Dont suppose anyone knows what type of output the honda gearbox gives? as well as what type of input the speedo needs? Need to get a speedo sorted so have to convert the gearbox output to suit the stack unit. Thanks Craig.

BiggestNizzy · Post by **BiggestNizzy** » Fri Jul 13, 2007 10:15 am

r10crw wrote: (like the four foot flames from the exhaust ).

4 foot flames sound too

why would you want rid of that ?

r10crw · Post by **r10crw** » Fri Jul 13, 2007 10:35 am

Got to admit I quite like flames, havent seen them but been told there pretty

, just a little worried for the rear clam its getting a little singed also the explosions from the backbox are a little worrying

jj · Post by jj » Fri Jul 13, 2007 10:37 am

I had a read through the thread on SELOC a couple of weeks ago, the guy who did it DIY - I am sure at one point he covers the speedo and how he hooked it up.

r10crw · Post by **r10crw** » Fri Jul 13, 2007 11:43 am

Cool Ill have a look there.

fd · Post by fd » Fri Jul 13, 2007 12:41 pm

Not sure what car you are but.

Lanbda heater is ECU controlled and can only be supplied when the main relay is energised, unsure about whether it runs the heater all the time, I expect it does - other cars I have investigated do.

Speedo signal on the S1 stack is straight from the inductive pickup and on the S2 K the ECU generates it . . . not sure about yotas, would have to lob a 'scope on to see what's actually there on either and on the honda box (probably another inductive pickup - probably a different number of pulses per rotation) then I guess a wee frequency converter would do the job of meshing them together and solving signal levels, etc.

Fd

robin · Post by **robin** » Fri Jul 13, 2007 2:27 pm

Craig,

On your car gearbox isn't involved. As Fd says, the speedo is driven directly from inductive pickup on near side wheel. More likely you've chopped and failed to reconnect the drive cable from the wheel.

The wideband unit that Lawrence has does switch the heater circuit off after a while.

I would guess the ECU you are using would also turn off the heater after a while, but cannot be sure - pretty easy to tell just by monitoring the output that controls the lambda heater relay (I think there is one) and see if it ever turns on, and if it does, whether it turns off within 10 minutes (no way it would be on that long).

Cheers,
Robin

r10crw · Post by **r10crw** » Fri Jul 13, 2007 2:51 pm

Thanks for the replies guys. As for the speedo, Ive fitted larger outer cvs to deal with the notorious Honda driveshaft issues so they dont have the teeth for the pick up, hence wanting to use the gearbox pick up. Ive taken a scope and signal generator home from work so might play around with that this weekend. Fergus do you know of specific frequency generators? or have to build a circuit myself?
The lambda isnt recieving power but probably cause I havent wired in the relay properly so just wondered if its ok to wire it to an ignition live so its on all the time? Thanks Craig.

tut · Post by **tut** » Fri Jul 13, 2007 2:59 pm

I had heard that the heater element on the wide band sensor on my JDM could be on all the time with the ignition on, ie listening to the radio, so could be burned out. Certainly looks that way when the K-Pro is hooked up to a notebook, as there is a fixed lambda reading of 10.7.

Asked Scuffers and got this reply:-

"no idea with yours Tut, depends how it was wired??

in std form, the heater is ECU heater controled, but I have seen some wiring where the hearter is left on when the engine is off, thus the element burns out...

All the best,
Simon"

Odds are that mine is burnt out.

tut

fd · Post by fd » Fri Jul 13, 2007 3:38 pm

Wouldn't have thought that a heater failure would necessarily kill a lambda, as it wil warm up when the exhaust heats up anyway . . . but I guess it could melt it if left running with no exhaust gas flow (which will naturally limit the max temp it can get to) . . .

Ref frequency converters, I'm not sure what's available on the market (there's bound to be some overpriced, overhyped solution for this on the shelf already) but it wouldn't be too difficult to lash one up . . .

Fd

r10crw · Post by **r10crw** » Fri Jul 13, 2007 4:06 pm

fd wrote: Ref frequency converters, I'm not sure what's available on the market (there's bound to be some overpriced, overhyped solution for this on the shelf already) but it wouldn't be too difficult to lash one up . . .

Fd

Ill hold you to that once ive all the parameters

Scottish Elises

Lambda

Lambda

Re: Lambda