SDL - Gear detection issue

[bazeng]

Hi

I'm having issues with getting the correct gear displayed on the SDL.
I've inputted the gear ratios in the software but it displays a gear below what it is in.

I am getting the speed input from the AUTRONIC SM4 ecu which is correct (calibrated correctly in the Autronic software).

The Autronic then sends it out to the datastream to the motec.
I'm thinking that the SDL requires to calculate the speed internally?

The SM4 displays the correct gear and speed.
Can I use the SM4 to output the gears to the SDL?

I'm thinking I could send it via the datastream into the SDL into a channel but before I do that, any suggestions to what it could be?

Also, in NEUTRAL, the gears go all over the place, is this correct? Is there a way to fix this?

Thanks

Baz

[IDP]

You can calculate the gears in gear detection using your tailshaft speed sensor.

Or you can use the Autronic speed input to calculate the Gear detection.

It depends how you set the drive speed calculation in the Speed and Distance tab. as Drive speed is what the gear detection uses.

I Don't know anything about the Autronic so can't advise on sending the gear to the SDL from there.

[chelspeed]

First thing I'd try is checking that speed is coming into the SDL correctly. Use monitor channels to see it's coming across properly. I've been expecting mph and seen km/hr which meant multiplier of 1000 and a divider of 1600 to get the speed I was expecting. I've even seen knots (nautical miles per hour) from a GPS and had to use a divider of 1852 and a multiplier of 1600 to get the speed I'd been expecting.

If the speed in neutral is all over the place then presumably because in neutral speed and revs are no longer related.

In neutral does it always go to a value outside 1 to 6 (assuming a 6 speed box)? If so then set up a 2D table in calculations with gear as an input and say gear2 as the output. Set the gears up as one to one ie 1 - 1, 2 - 2, 3 - 3 etc etc. Then at the bottom of the table set -100 - 0 and 0.9 - 0. Then at the top of the table set 6.1 - 0 and 100 - 0 (assuming 6 gears). That forces the gear displayed by gear2 to be 0 when it isn't 1 to 6.

As another neat trick, on the ADL3 if you set neutral on gear 2 to be -2 then it will display n for neutral rather than 0. Not sure if the SDL can do the same trick.

[bazeng]

Fixed!

The numbers I had were incorrect (I calculated the speeds based on tyre rolling diametre etc).

I basically set the SDL to display RPM and SPEED on a large display and obtained the numbers that way @1000rpm.

I think inputted them into the software and it works perfect now.

Now the only issue is rolling in Neutral which makes the SDL go into random gear numbers.
Is there a way of making it show 0 or N if say it the throttle is closed , ie under 1% tps?

Apart from that, I can live with it if it isn't possible.

[JamieA]

send me some logging from your SDL showing the gears going up and down and I will look at it for you.

it might be a bit challenging as the dash is trying to backwards calculate from your speed and rpm to a gear, and when you are in neutral rolling along, it cant know which gear you are in. But Ill see what I can do.

regards


-Jamie

[trainwrex]

I just wanted to add to this topic as i have a similar issue. I dont know too much about the configs and learning as i go. I had a workshop install the SDL and SLM to run with my M800 plug n play for GD STI. But the gear selector stays on 0. The workshop didnt have time to sort it out and would do at a later stage but i figured id try and do it my self..

I have imputed the right gear ratios, but this has not done anything to change the gear selector from 0. Is there anything else i need to do so that the SDL can pick the gears?

A step by step guide would be great.

cheers, in advance.

[chelspeed]

You need to set up the SDL to display gear in the centre box. From dash manager select function and then display. Double click on the "centre" box, click on select, click on search, type gear and select gear from the list.

[trainwrex]

Yeh ive done that and the gear selection is displayed on the sdl but it dosent change gears on the display??

[chelspeed]

Sorry to sound patronising but I don't know what you know or don't know.

So you are trying to display gear by reading speed and rpm and working out the gear from the keypad entered gear ratios? In calculations, gear selection you have selected method as speed/rpm? You have the right rpm (on mine "Engine RPM") and speed signals (on mine "Drive Speed") selected? If "Drive speed" then this is set up in calculations, speed and distance. You have output selected to the same variable (on mine "Gear") that you are asking it to display on the centre box of the display page?

Fault find - set up a display line with the same speed and rpm signals used in the gear selection (on mine "Engine RPM" and "Drive Speed"), go for a drive and confirm the display is getting the sensible input data (speed and rpm) for the gear calc. I presume RPM is OK as that's the first thing your installer would have got working for the display. But speed is not so obvious, do you have speed displayed already? Where is the speed signal coming from, wheel speed sensor(s), OEM speedo input, over CAN?