kenton
|
| posted on 1/3/12 at 08:04 PM |
|
|
Emerald ECU woes
Over christmas i fitted an emerald ecu to my rover v8.
It was mapped at emerald in january and since then my MPG has gone from 23ish to 13! the plugs are very sooty which points to running rich.The air
and water temp sensors are working, there is no restrictions in the air intake and it drives normally.
The injectors are set to fire in pairs, 0, 90, 180, 270 degrees. so i assume that for each firing of each cylinder it gets 2 squirts of fuel, am i
understanding this right?
As it was mapped and i am rubbish around a laptop i assume it was set up right, is it possible that even though they had a lamda sensor poked up the
exhaust they could be so far off?
Emerald have said to bring it back to them (there in norfolk, im in sussex) i would like to avoid that if poss.
The fuel pressure is running at 38 psi, ive lowered it to 30 and just gone for a drive and havnt noticed any change in performance. Would 8psi change
my mpg much? If not how low can i go and the injectors still work?
Kenton
|
|
|
|
|
cliftyhanger
|
| posted on 1/3/12 at 08:21 PM |
|
|
Take it back, far better than playing about. If there is a problem I suspect they will put it right (assuming it is their fault)
Out of interest, it it manage the 23mpg after it was mapped, and has since got gradually worse? An exhaust leak could cause mapping issues....
|
|
|
kenton
|
| posted on 1/3/12 at 08:33 PM |
|
|
It was 23 with the standard rover ecu and dissy set up. Been bad since fitting the emerald system
|
|
|
perksy
|
| posted on 1/3/12 at 08:57 PM |
|
|
Be wary of fiddling with the fuel pressure and altering the settings from what it was originally mapped at
Do you know what the emissions figures are like at present ? as that would help with a diagnosis
|
|
|
will121
|
| posted on 1/3/12 at 09:04 PM |
|
|
did you have details of what the fuel pressure was when mapped? i wouldnt just adjust the fuel pressure without some sort of lamba sensoring, to low a
pressure may lean the mixture to much, is it emerald ECU with 3 map option? is it still switched to the orignal map? finally did you take a copy of
the ECU MAP when first done that you could compare it to, to make sure nothing has changed or take a copy now and email it to Emerald to confirm its
the same as he normally takes a copy on the day.
Finally what sort of power are you getting and how were you driving when getting 13mpg?
|
|
|
kenton
|
| posted on 1/3/12 at 09:05 PM |
|
|
OK, i will take it to a garage on saturday and see what they are.
The printout from the mapping session shows an air fuel ratio of betweem 12.5 and 14.
|
|
|
will121
|
| posted on 1/3/12 at 09:05 PM |
|
|
did you have details of what the fuel pressure was when mapped? i wouldnt just adjust the fuel pressure without some sort of lamba sensoring, to low a
pressure may lean the mixture to much, is it emerald ECU with 3 map option? is it still switched to the orignal map? finally did you take a copy of
the ECU MAP when first done that you could compare it to, to make sure nothing has changed or take a copy now and email it to Emerald to confirm its
the same as he normally takes a copy on the day.
Finally what sort of power are you getting and how were you driving when getting 13mpg?
|
|
|
Big_Al
|
| posted on 1/3/12 at 09:12 PM |
|
|
I have an emerald k6 on an 1800 Zetec which i fitted, but have never had it mapped.
I was originally getting 16mpg on a run, but I then set up the adaptive mapping setting and it is up over 30mpg now. May be worth seeing if the
adaptive mapping feature makes any difference.
|
|
|
kenton
|
| posted on 1/3/12 at 09:15 PM |
|
|
It was mapped at 38psi. I have the switchable 3 maps, map 1 and 2 are the same except 2 has a better tickover.
Map 3 is economy but its too "lumpy" for anything but cruising and the mpg isnt much better, maybe 14.
Driving is spirited, normal early sunday morning drive with SKCC. 
I do have the maps saved onto a memory stick but i havnt changed any of the ecu settings.
|
|
|
kenton
|
| posted on 1/3/12 at 09:18 PM |
|
|
I dont have a lambda fitted, i would need to get a boss welded in the exhaust.
Thanks for the sugestions, a few things to check befor taking it back.
[Edited on 1/3/12 by kenton]
|
|
|
will121
|
| posted on 1/3/12 at 09:23 PM |
|
|
quote:
Originally posted by Big_Al
I have an emerald k6 on an 1800 Zetec which i fitted, but have never had it mapped.
I was originally getting 16mpg on a run, but I then set up the adaptive mapping setting and it is up over 30mpg now. May be worth seeing if the
adaptive mapping feature makes any difference.
think the adaptive mapping will need a lamba sensor fitted to use in closed loop with mixture feedback to the ECU
|
|
|
Big_Al
|
| posted on 1/3/12 at 09:28 PM |
|
|
I think i have spotted the problem. Driving with SKCC will never equal good mpg!
|
|
|
ashg
|
| posted on 1/3/12 at 09:35 PM |
|
|
could it be something to do with the fuel flow being better than when it was mapped. i distinctly recall us unblocking your fuel system in the middle
of the town when we was on the last french blat
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
|
|
|
matt_gsxr
|
| posted on 1/3/12 at 09:39 PM |
|
|
Surely its got to be a sensor, most likely the connections to it.
Water temp (you have checked)
Air temp (you have checked)
Manifold air pressure (maybe an air leak? or dodgy connection)
TPS (you might have one of these but maybe not)
Fuel pressure change of 20% would cause a 10% change in fueling, not enough to see a >50% increase in fuel consumption. So that might be a red
herring.
Can you collect a datalog and post a screen shot of it?
Just my thoughts.
Matt
|
|
|
kenton
|
| posted on 1/3/12 at 09:59 PM |
|
|
Hi ash, nothing has been changed since the mapping. I dont have a MAP sensor and the TPS is working fine.
I thought changing from the dissy to coil packs and a programable ecu would give me the option of fuel economy and full on blat mode with the
switchable maps making it more reliable in the process.
My computer skills are not up to that which is why i took it to emerald in the first place.
[Edited on 1/3/12 by kenton]
On the live screen all the sensors are working .
[Edited on 1/3/12 by kenton]
|
|
|
will121
|
| posted on 1/3/12 at 10:12 PM |
|
|
quote:
Originally posted by matt_gsxr
Surely its got to be a sensor, most likely the connections to it.
Water temp (you have checked)
Air temp (you have checked)
Manifold air pressure (maybe an air leak? or dodgy connection)
TPS (you might have one of these but maybe not)
Fuel pressure change of 20% would cause a 10% change in fueling, not enough to see a >50% increase in fuel consumption. So that might be a red
herring.
Can you collect a datalog and post a screen shot of it?
Just my thoughts.
Matt
As matt highlights above, have you plugged in a laptop to see what its displaying in the live mapping softwear screen? this would identify all the
temp sensors etc working fine
|
|
|
.JPG)
