CBR6DC

i heard off a mate something about closed loop or something to do with a 4x4 having a lambda sensor and being a good conversion to a 2wd.

is that true? he'd heard of people geting 5 or 6 mpg extra from it with no ealtime loss in performance.

mark r

and more than that up to 10 to 15 miles depending on what stage tune .have a look on motorsport development web site for the chip with closed loop for your car

CBR6DC

thanks for that.

L8/P8 here:
http://www.motorsport-developments.c...losedloop.html

i see the P8 is used on quite a few bikes etc but the L8 is more cosworh specific and they say it's standard on escort cosworths but is it a case of - every loom from every cosworth is the same - you just need to unplug the L1/L6 ECUs and plug in an P8/L8? What is the difference between the 2?

i know very little about cosworths but am willing to learn... i want a usable performance car - not one that does10-20 to the gallon as soon as you press the accelerator down!

i have a cosworth with no engine or gearbox and no engine loom but its got a map sensor and a -31 actuator i think. Got a pace intercooler as well (£10 delivered! thank you ebay! ).

cossie4i+

iTrader: (15)

I didn't gain any mpg when i had closed loop fitted but the CO at idle was great

Steve

CBR6DC

Hmmmm any more for any more?

Does this even work then?

1 says 10-15mpg is possible and 1 says 0?

James @ M Developments.

iTrader: (2)

its impossible for us to say how much you will gain, or if you will gain at all, because it depends how well the car cruises and idles now,

If it cruises at 9:1 then you can expect some mega fuel savings!

Closed loop will self calibrate the fuelling under certain driving conditions and allow a perfect cruise at lambda 1. its especially important on large injectors, where the ECU can struggle to have enough controlability or break points to map them to fine tolerances, and closed loop can "fill the gaps" so to speak.

Personally i wouldnt own a cossie without it being closed loop controlled. but thats my opinion, and the opinion of pretty much every car manufacturer who has made a car since 1992.

Fuel economy is only one of the reasons to fit closed loop, the plugs will last longer, the engine life will be increased, the oil will stay fresher and last longer,and you are doing your bit for the planet! all benifits of good fuelling.

Glenn_

iTrader: (1)

Steve how come you didnt see any gains then.

CBR6DC

Hmmm interesting. The oil and plugs bit go hand in hand with the engine life and that's cool since i'm mechanically sympathetic (used to change the fully synthetic oil on my racebike every 2 or 3 days use and it was black! still going after 5 years though... , used to rev within 500rpm of rev limit etc ).

Nice to hear - i want a quick but reliable cosworth as parts are rare and although relatively easy to fix, incredibly difficult to get hold of the parts!

Especially since it's cheaper for me to insure a tuned cosworth (listing suspension/engine mods!) than a bloody stock 1.4 focus!! Why the hell is that!?

Glenn_

iTrader: (1)

Surely the focus must be cheaper to insure?

kosienutter

I have not got closed loop Yet lol, but on the way back from Silverstone I got 42 mpg and I wasnt exactly driving economically too, I had my mathmatical genious of a wife calculate it all 3 times and we were both shocked at the mpg the cossie got, cruising about 80/90 with a very very (exhaust scrapping) heavy boot load too. We measured it out of a 1/4 of a tanks worth from top to 3/4 full. Got 150 miles out of 1/4 of a tank. On the way up though I got 165 out of 1/4 of a tank as I was driving more sensibally.

Cauf61

On my cossie exactly the same. No mpg gain , zero, nothing, nada

cossynut2

Wow!! I am amazed at your MPG figures, what Cosworth do you drive, 3 door or Sapphire? What engine specc have you got? I think I have done well to get 25 mpg on a motorway run !! When pressing on hard you can almost see the fuel gauge dropping. Maybe another trip up to MSD to get the closed loop fitted is on the cards.

cossie4i+

iTrader: (15)

James does say above if your car is already well set up you might not gain anything.

Your CO must be better ?

Steve

cossie4i+

iTrader: (15)

I can get 32mpg out of the 4i on a motorway @ 70mph

Drops a LOT when you have fun

Steve

cossynut2

Hi Steve, I will have to learn to drive slower and see if it helps with the mpg!!
Cheers Richard.

Rod-Tarry

Silly me I thought Cossies were about going fast. Surely if you are checking fuel ecconomy its not the car for you. My Pug 107 will return 50mpg however you drive it. As for trying to get 40mpg from a YB almost dropped my Coffee at that. Its like sleeping with Kylie & not touching the goodies. Come on lads she should be getting a right bashing same with Cossies.

cossie4i+

iTrader: (15)

That's without closed loop as well, just a light right foot.

Steve

Cauf61

I am very very amazed about these mpg figures !!
My 3 door stage 1 closed loop ,with engine in very good condition ,don't get lower than 13.8l/100 km. ( 20.5 mpg)
This driving very slowly, almost no boost pressure , 95 % of the time !!!
Really , my racing time is long gone.

Even motorway makes no great difference ??
Checking AFR and CO gives very good figures .

When i start using turbo boost i really see the fuel gauge dropping.
I do not understand where all the fuel is going


How you guys get 25 or 28 mpg is a complete mystery to me.

May somebody got tips ?

Grts
Patrick

tib2220

I drive my 4x4 saph as my daily drive and I totally agree with you, they're meant to be driven fast not worrying about mpg!

James @ M Developments.

iTrader: (2)

Thats fine in some cases, but to me there is no need for them to be poor on fuel during some scenarios, as example if your cruising on the motorway, or crawling around in traffic its a little pointless them doing 10mpg when you could be doing 30mpg. Thats like driving around handing out £5 notes from your window.

If your not bothered about how much its costing to run think about where all the extra fuel being used is going and what it is doing as the fuel economy is only part of its advantages.

cossynut2

Hi Rod ,have to agree with you , I find it is a car which is not happy at slow speed, if you want to get 30-40 mpg do not buy a Cossie !! Every time mine goes out( subject to traffic and our friends in blue ) it gets used properly and even after 20 years of ownership always puts a smile on my face!! I still cannot believe the 40 mpg claim at 85-90 mph !!!

RSMK4TURBO

How much does a drive in drive out conversion cost on L6 stage 1?

opposite lock

iTrader: (3)

I have to disagree there slightly as the saph isnt just a hooligan machine ,I use mine a few times throughout a year travelling across to the west country so a degree of good fueling is needed. also when most boxes have been ticked its nice n cheeky to have half respectable MPG on cruise.