lotusmadandy
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| posted on 1/12/11 at 04:51 PM |
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More megasquirt help needed
Evening all,
Once again i need the help of the mighty lcb'ers
I have built and installed my ms1 v3 and have the engine running nicely in the garage
but i have an issue with the air and coolant gauges in megatune.
At first start from cold both gauges read -30 degrees c and with the engine at normal
operating temperature the coolant reads 30 degrees and the air temp reads -13 degrees.
I have had a day off work today and went in the garage to try and sort it.
Try as i might i havent been able to do a blooming thing with it
If i could get it off warm up enrichments i think i might start to make progress
but try as i might,it is defying my efforts.
Can any of you ms experts tell what i am doing wrong please????
Many thanks in advance
Andy
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matt_gsxr
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| posted on 1/12/11 at 05:34 PM |
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Sounds to me like you have non-standard temperature sensors, or a different bias resistor than the MS is expecting.
EasyTherm is the solution, which allows you to change the calibration curves in the MS.
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coyoteboy
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| posted on 1/12/11 at 06:14 PM |
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Yup, non-standard sensor curves there, you can try to tweak it with easytherm. If it's too far off (some of our bike engine ones are) you may
need to alter the bias resistor for them.
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paulf
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| posted on 1/12/11 at 07:00 PM |
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The best bet would be to swap the sensors or the bias resistors to suit the sensors that are fitted.I used a Bosch coolant sensor and a slightly
different bias resistor for the water and a sensor from RS that matched the mega squirt standard one.
I think the coolant one was from a vauxhall, and the air temp may also be suitable .It is really only the air temp that is critical as it affects the
fuelling, water temp is just used for cold start and warm up enrichments.
The other option if you are using ford sensors is to change the bias resistors to 27k items .
Paul
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coyoteboy
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| posted on 1/12/11 at 07:18 PM |
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If you swap the bias resistor you still need to easytherm it as the curve won't have the same errr curve as for the squirt sensor.
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big-vee-twin
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| posted on 1/12/11 at 07:33 PM |
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Use Tuner studio software downloadable and free and input the resistance values of the sensors, Tuner Studio is better than Megatune as it is
supported and Megatune isnt.
You put your sensors in the fridge measure the temp and resitance of the sensors, put them under your armpit and do the same, and then place over
boiling water in the steam and measure again, put both sets of figures into the software.
Providing three temperatures and three resistance readings allows the software to plot a temperature/ resistance profile of your sensors.
[Edited on 1/12/11 by big-vee-twin]
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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lotusmadandy
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| posted on 1/12/11 at 07:48 PM |
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Thanks for the replies gents, what exactly is easy therm and where
can i get it?
I have found an air temp sensor on the bay that is the correct resistance for ms.
Is this worth a go do we think???Its only 12 bar.
Cheers,
Andy
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big-vee-twin
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| posted on 1/12/11 at 08:04 PM |
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Go to this link scroll down to the Easytherm section there is a download link there link Actually go
from that page to the sensors and wiring page see list on left
[Edited on 1/12/11 by big-vee-twin]
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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lotusmadandy
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| posted on 1/12/11 at 08:35 PM |
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quote:
Originally posted by big-vee-twin
Go to this link scroll down to the Easytherm section there is a download link there link Actually go
from that page to the sensors and wiring page see list on left
[Edited on 1/12/11 by big-vee-twin]
many thanks,i will get on the site as soon as wor lass
is finished with the laptop.
Andy
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lotusmadandy
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| posted on 1/12/11 at 09:10 PM |
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Ok, i have just orderd the correct ms air temp sensor from
eblag.Just need to sort out a coolant sensor now.
Andy
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BaileyPerformance
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| posted on 2/12/11 at 09:25 PM |
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quote:
Originally posted by lotusmadandy
Ok, i have just orderd the correct ms air temp sensor from
eblag.Just need to sort out a coolant sensor now.
Andy
Hi Andy,
If you are using Standard Ford sensors you need to replace R4 and R7 with 27kohm, if you are using megasquirt (GM) sensors you need 2.49Kohm
resistors (these are fitted as standard as part of the MS build)
There is no point in attempting to get the engine running right until the air and water sensors are reading correctly as the fuelling will be all over
the shop! If you run the engine too rich you can damage it, engine damage can happen with AFR <11 low load.
Let me know if you need anymore info.
Cheers Dale.
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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lotusmadandy
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| posted on 3/12/11 at 06:12 PM |
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quote:
Originally posted by BaileyPerformance
quote:
Originally posted by lotusmadandy
Ok, i have just orderd the correct ms air temp sensor from
eblag.Just need to sort out a coolant sensor now.
Andy
Hi Andy,
If you are using Standard Ford sensors you need to replace R4 and R7 with 27kohm, if you are using megasquirt (GM) sensors you need 2.49Kohm
resistors (these are fitted as standard as part of the MS build)
There is no point in attempting to get the engine running right until the air and water sensors are reading correctly as the fuelling will be all over
the shop! If you run the engine too rich you can damage it, engine damage can happen with AFR <11 low load.
Let me know if you need anymore info.
Cheers Dale.
Thanks Dale,
I have bought a megasquirt air temp sensor that reads within a few degrees of ambient in the garage.
I will sort a gm sensor on monday,i believe the vauxhall vectra item is suitable.
Cheers,
Andy
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