Closed Loop MPG
12-12-2008, 06:07 PM
#14
saff is working!!!...atm
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.........thought c/l only worked upto 3800rpm/ just under 100mph (think i read it on here)....unless u have different gear ratios...???.....i'm probably wrong.........as per..............
12-12-2008, 06:11 PM
#16
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Closed loop normaly works till the car comes onto boost then reverts back to the map but the bigger the turbo the more rpm you can get before it comes on boost so i t4 car will come on boost later than you t38 so will get a higher top speed in 5th gear before it reverts back to its map......
anyhow pete i bet yours is getting mint mpg at the min.....lol
anyhow pete i bet yours is getting mint mpg at the min.....lol
12-12-2008, 06:13 PM
#17
saff is working!!!...atm
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Closed loop normaly works till the car comes onto boost then reverts back to the map but the bigger the turbo the more rpm you can get before it comes on boost so i t4 car will come on boost later than you t38 so will get a higher top speed in 5th gear before it reverts back to its map......
anyhow pete i bet yours is getting mint mpg at the min.....lol
anyhow pete i bet yours is getting mint mpg at the min.....lol
12-12-2008, 06:22 PM
#20
Testing the future
12-12-2008, 10:17 PM
#22
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Just a bit of info to clarify whats already been said..
Generally, Closed loop is not enabled during medium to heavy loads so in effect is turned off and reverts to the original mapping.
Closed loop is enabled when ALL the following conditions are met...
(rough figures)
Engine temperature above 55 degrees C
Below 3800 rpm
Below 5psi
Below 60% throttle position
Steady state RPM for 0.3 seconds
Steady State manifold pressure for 0.5 seconds
So you can see any sudden load changes or demand for power will turn closed loop off.
If you drive it gently without sudden throttle movements it will reduce fuel consumption.
If you rag it all the time even short bursts of medium acceleration, it will still drink fuel.
Dont forget, it is a performance car...LOL
If you want to save the planet, buy a push bike
Generally, Closed loop is not enabled during medium to heavy loads so in effect is turned off and reverts to the original mapping.
Closed loop is enabled when ALL the following conditions are met...
(rough figures)
Engine temperature above 55 degrees C
Below 3800 rpm
Below 5psi
Below 60% throttle position
Steady state RPM for 0.3 seconds
Steady State manifold pressure for 0.5 seconds
So you can see any sudden load changes or demand for power will turn closed loop off.
If you drive it gently without sudden throttle movements it will reduce fuel consumption.
If you rag it all the time even short bursts of medium acceleration, it will still drink fuel.
Dont forget, it is a performance car...LOL
If you want to save the planet, buy a push bike
Last edited by ECU Monitor Enthusiast; 12-12-2008 at 10:22 PM.
12-12-2008, 10:56 PM
#24
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I don't have closed loop and have still had 35 mpg at a steady 90 all the way from brum to Watford gap services. As long as I keep it off boost and accelerate GENTLY its surprisingly good on fuel. This was worked out from brimming it before I set off and then brimming it again at the services.
For the cost of closed loop/coilpack etc am I really likely to see much of an improvement?
For the cost of closed loop/coilpack etc am I really likely to see much of an improvement?
13-12-2008, 12:17 PM
#27
I've seen 38mpg not on closed loop, I just don't run in closed loop, have found no noticeable difference between the two.
If ignition system is up to scratch you will have no misfires.
tabetha
If ignition system is up to scratch you will have no misfires.
tabetha
.
13-12-2008, 03:18 PM
#34
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This uses a lambda sensor to detect the air/fuel ratio (mixture).
If it senses the mixture is slightly rich then it leans off the map and visa-versa.
This only happens for idle and light loads if using a narrow band sensor type.
If a wide band type is used then the ecu can adjust throughot the map all the time.
WASTED SPARK
On conventional cars there is a distributor that has mechanical moving parts to delivery the spark to the right spark plug.
Th rotor arm in the dizzi doesnt touch the connections so inside the cap, a spark jumps from the rotor arm to the selected spark plug.
This makes the spark at the plug weaker and also the dizzi is sensitive to miosture.
On a wasted spark system, 2 coils are used instead of 1.
One coil fires plugs 1 and 4 at the same time, the other coil fires 2 and 3 at the same time.
As there are 2 coils, the ignition system has twice as long to charge them so can produce bigger sparks.
Also, there are no moving parts to waer out and no sparks outside the cylinder.
Bigger sparks mean better idle and and smoother running and helps towards saving fuel and emissions.
Its called wasted spark because 2 plugs are fired all the time and so 1 is wasted as only 1 cylinder is actually firing due to it having a fuel mixture.
This is ok as when 1 cylinder is on the firing stroke the other is always on the exhaust stroke.
Last edited by ECU Monitor Enthusiast; 13-12-2008 at 03:19 PM.
