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[Marks DTM Calib]

Better than that....I know the owners dad...who is also a director....

[Kevin Wood]

Ahh, OK. Good on both counts.

I will have a think about one then.

Kevin

[STMO123]

Crikey, that's quick!

I wonder if the speedo calibration is OK because that's fast!

Still, if the seat of the pants has noticed a worthwhile difference, that's the main thing.

Out of interest, have you noticed any downsides to the new cams?
Was thinking they may have made the torque at low revs a little weaker or the idle a little lumpier?
Then again, they're probably still fairly mild cams so unlikely to have too many down sides.

No point in asking about the fuel consumption yet by the sounds of it!
(or the low RPM performance for that matter!)

Cheers,

Kevin

Funny you should say that, the idle is lumpier, not much just a very small, but noticeable vibration...

As for the speedo calibration, I do have 50 profile tyres rather than 55 as I should have, which I had kind of forgotton about until last night - this could affect that speed - don't know if I could test it on a GPS - not sure if it would be quick enough at reporting my speed if you see what I mean..

You could probably (with a calculator ) work out the difference here

http://www.miata.net/garage/tirecalc.html

[Kevin Wood]

Bear in mind that speedos always read high in any case.

When I put the kit car through its' single vehicle approval test speedo calibration was part of the procedure. It was allowed to over read horribly but not to under read. IIRC, at an indicated 70 MPH a true speed of 57 to 70 MPH was allowed.

Thinking about it, TheBoy mentioned accessing the dash via Tech2 to check his temperature gauge. I wonder if it's possible to adjust the speedo calibration?

Kevin

[Marks DTM Calib]

You cant adjust it.....every speedo I have checked on an Omega (using tech2) has read over by 3-5mph.....but its a constant 3-5mph from about 30mph upwards.....so not a percentage error.

[Admin]

Yep, using the slightly less scientific method of Sat Nav speed against speedo reading gives speedo over reading by a steady 3mph at speeds over 40mph to... well... high speeds...

[TheBoy]

You cant adjust it.....every speedo I have checked on an Omega (using tech2) has read over by 3-5mph.....but its a constant 3-5mph from about 30mph upwards.....so not a percentage error.

I would concur. All I have Tech2'd read slightly over, usually by a consistent amount. 2-3mph seems to be average, though some less, some more. Note, this is with Tech2 - remember there are other things that affect accuracy, even down to tyre wear...

[Kevin Wood]

OK. I'd have thought there would be some way of calibrating for different wheel sizes and the like. In the old days you just fitted a diffferent speedo cable drive gear. Maybe the errors are not significant enough to bother.

Kevin