The point I was tryin to make is that there are only so many options with a stock engine and once it’s tuned it’s tuned…You don’t need to retune for a larger volume fuel pump since it has no change in pressure… Slightly larger injectors can be corrected for by the stock ECU but the added fuel delivery gets cut over time by the stock ECU… The stock ECU does make corections and has a fixed target A/F ratio… Now bring your car back to the dyno after driving around for a few weeks and your power will change…Sorry but that’s how the stock ECU does it’s thing in order to correct to it’s programed target…
A retune will map in a new target A/F and ignition timing… This is the sience of the ECU and it is fact…
Old school tuners would just install larger injectors and expect a change to last, it doesn’t… [/quote]
Frank,
forgive me but I am not yet familiar with the stock ecu. when you say it has a target lambda, does it run closed loop wide band lambda across the whole map, ie. when manifold is under vacuum and under pressure? or are there areas of the map which are open loop? (I would assume towards the top end which would explain the need for remaps when messing about with extra power.
If it does run closed loop wideband at all, are we talkiong about a proper wideband like a bosch lsu 4.7 or an NTK ie. 5 wire as opposed to the lame psuedo wide band 4 wire jobbies?
My 260 goes open loop anything above 1/3 throttle and stays there until throttle is reduced…
It did ,however manage to trim fuelling from very rich (low 10,s) to high 11,s over time even though it ran mostly in open loop .
I still guess that it still measures lambda in open loop and trims accordingly over time.
Only time will tell if mine trims too far but I monitor closely and so far so good.I wouldn’t advise my route when tunes are available,but I enjoy the challenge.
What I did was quite crude really but I have fantastic results so I’m happy.
jfk take your car to the dyno and see how happy you really are…
As for the stock ECU it has a preset target lambda runing with narrow band O2 sensor, I’m not a ECU geek but I do know it will make corrections in the A/F ratios if you add headers or larger injectors how wide those corrections are was never my concern since I was the guy building the hard parts while Charlie was tweeking the Lotus software… My job was to dictate while driving while Charlie made the corections to the software and then lock down the ECU’s corections…
Charlie is now off the grid so I can’r really say how the ECU made the corrections or how he stopped the learning function…
Thanks for the reply. Know what you mean re gearhead.
I’m worse because I’m neither, I vaguely understand the ecu btt but I watch others Mao, and although. Plan and buy the parts, I pay other people to do the manual stuff.
I wish I could do it, but I don’t have te tools, and don’t trust myself.
Re the ecu, if it runs narrow band, I’m leaning much much more towards an aftermarket ecu.
It sounds like open loop on boost but that just means I am more concerned about he email tuned komotec map that my car has.
[quote=Adamantium]Thanks for the reply. Know what you mean re gearhead.
I’m worse because I’m neither, I vaguely understand the ecu btt but I watch others Mao, and although. Plan and buy the parts, I pay other people to do the manual stuff.
I wish I could do it, but I don’t have te tools, and don’t trust myself.
Re the ecu, if it runs narrow band, I’m leaning much much more towards an aftermarket ecu.
It sounds like open loop on boost but that just means I am more concerned about he email tuned komotec map that my car has. [/quote]
My stock ECU was reprogramed to run off wideband but the thing to remember if anything happened to the sensor you are always at the mercey of the tune and you better have a proper tune that only depends on the wideband to make very small corections or else lose a O2 sensor and lose your engine…
The stock ECU can be retuned and has been trouble free with the retune, not one engine failure due to any Essex retune…
As for the other guys that’s another story.
If you plan on making wild mods to the engine you will need a standalone and a real tuner to set it and you can forget it… I had Mitch Pederson formerly with AEM do the tuning on my current setup, his history and current tuning projects speak for themself… Everything from Pikes Peak racers to tuning a Bugatti EB110 SS to pass California smog. The tuner is the key not so much the ECU…
My car runs better than stock and never misses a beat due to the tune or ECU…
I will never have to touch the ECU again.
[quote=Boothy][quote=Adamantium]Thanks for the reply. Know what you mean re gearhead.
I’m worse because I’m neither, I vaguely understand the ecu btt but I watch others Mao, and although. Plan and buy the parts, I pay other people to do the manual stuff.
I wish I could do it, but I don’t have te tools, and don’t trust myself.
Re the ecu, if it runs narrow band, I’m leaning much much more towards an aftermarket ecu.
It sounds like open loop on boost but that just means I am more concerned about he email tuned komotec map that my car has. [/quote]
