Those of you fitted with closed loop what sort of mpg do you get doing a steady run at 75-80 ???????

Steve.

 

i have seen 35 from mine driving uber steady at 65mph.

 

Between 37 and 38 .

 

Thats more than im getting

Steve

 

What is your car doing ? how is it going after the set up ?

 

what turbocharger are you on steve?

 

Its just a baby T34.55 but it is off boost when doing 75-80

Steve.

 

on the motorway driving between 80-95 mine does over 30mpg....without c/l......

 

30-35 if i just cruise at about 80

 

i dont think trip number 1 is the best to use as a test though, if your like me you were playing and testing on the way home lol

even hitting the throttle once ruins that gallons return lol

 

when mine on closed loop i easy get 40mpg on a long run off boost

 

its weird col, i reckon the bigger the turbo the better it is on fuel in closed loop. on my T4 im in closed loop at 110mph....and im in closed loop much more than i was on the T34

 

Just drove at 75-80, was being good because of the weather and distance

Steve

 

.........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..............

 

na my speedo is miles out lol.
it probably is 100ish

but the t4 makes no boost there, where as the t34 was making boost, and closed loop doesnt work over 4psi

 

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

 

.........fuckn superb.........i put £40 in it 8 weeks ago.......havn't used fuck all.............lol...(not)

 

i filled mine up 4 months ago, and its still got a full tank

 

never really worked it out but i have managed on more than 1 occation to get from coventry to my x's in alloa in scotland on 3/4 of a tank bout 340miles

normally averagin between 70-80mph,

 

that's not weird at all as the larger turbo has less restriction to it

 

I worked it out that i got around 36 to the gallon when i went to Castle Combe earlier this year, that was 4 up with stuff in the boot doing between 80 and 90 all the way there and back.

Well impressed tbh!

I'm running a TT T38

 

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

 

i have always wonderd what this closed loop was

 

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?

 

Yes in the long term

 

Wasted spark is one of the best mods you can do to a Webber equipped cossie, night and day, no more fucking cracked dizzy caps arcing out .....

 

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

 

Wouldn't have a cossie without wasted spark,best thing i did to my saph.

 

............fuckn what..???........can u please tell me why u said that........

 

Cos.......it's.......true......and ............idles......sooooooooooo........much... ...nicer......and.........drives.........better... ...too.

 

...................................well maybe ur car was just a pile o' shite before u did it........

 

No,maybe it is now

 

i no i am thick but what does this wasted spark and closed loop stuff actually do?
im always confused when i read about cars having it in mags

 

CLOSED LOOP
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.

 

thnakyou

 

ive bought coilpack and still not fitted it,my car doesnt misfire atal and revs to nearly 8k,

 

it deffo improves idle as you can run a wider plug gap, thus improving fuel economy even further...

mine never misfired on boost without it, but i still noticed a big idle improvement

 

What sort of cost is involved to run Closed Loop and Wasted Spark on a Cossie??


Cheers,
Grant

 

a full closed loop kit is around £400 iirc, thats the whole lot.


closed loop needs an L8, then its just a chip and a lambda sensor

 

col ive seen loads of cossies @450bhp+ on a group a coil and never having issues with idling or missfires ,look at all the old turbo systems cars for example ! the advantage as i see it to a average cossie is just more reliability