Morning,

I've got an Innovate wideband that i've just installed into my car. I thought it was running a little rich in the midrange and the lambda sensor seems to back this up.

Anyway, just wondering whats ideal, some say 12.5 a "tuner" told me 13.1 I've also heard 11.9 to be safest.
I was told by another person anything from 0.8-0.9 lambda to be the the limits (11.76-13.23)

So whats best?
Its on a turbo car. And at the moment its hitting 11.6 as the leanest on WOT. And about 10.6 at very richest, only ever hits this for a split second.

It's probably the wrong place to ask on the ford forum as all the cossies i see are bluming black smoke out like there on a mission to "clean" there bores

Many thanks.

 

........Where was this tuner based? Deepest Essex by any chance?

 

lambda means IDEAL in greek,,,

peak power happens around 12.6:1

i run my car at 11.7:1 at heavy loads

the thing is, air fuel ratio effects burn speed, so if your car was mapped on the a/f its running now, and you lean it up, you could loose power or even worse det your engine

 

12.5-12.6 is the theoretical maximum power for petrol, but some N/A honda engines seem to make peak power when a little leaner than this, so potentially if you spoke to someone who tunes those then 13.1 might be a genuine figure he has worked to.

For a cossie, high 11s or VERY low 12s is where its at in order to control temperature, but again there are many reasons for it to vary.


What engine are you talking about?

 

Sounds a little dangerous to me.

 

No it doesnt, its just a letter.

In mathmatical terms, its used to display variance, and thats the context its named after with a lambda gauge, as it shows variance from a set value (14.7)

 

sorry chip,,, you are right,,, i havent a clue where i dug that from

 

Gets so dull it always being the case


Out your arse?
(play on the word greek if you need it explaining, lol)

 

RickyLee53

On a Cosworth YB engine, ideal AFR readings should be like those shown on the RIGHT-HAND table.

The left-hand table shows dangerous figures (in the green area) that must be avoided at all costs.

 

λ

 

thing is ive read it somewhere,,, but cant remember where

 

Possibly you are confusing it with its use in describing varitation from predicted results?

If you predict you will get 875 bananas and you get 875 bananas, then that would be a lambda value of 1, and would be a perfect/ideal prediction

 

PS

Has Phil found out gareth's password, sounds more like his trick trying to sound clever by repeating things without knowing anything about what they mean or what context they were meant in

 

oh come on chip no need to take the piss,, ive learnt a lesson,, dont believe everything you read in books

 

Dont forget lambda is a ratio depending on fuel type.

Petrol is 14.7
Diesel is 28.0 to 32.0 ish
Natural gas about 5.0

 

I'l not name the tuner as it was just the cheapest big shop i found that stocks the innovate stuff in the UK and while telling me what the guage features he said dropped the figgure 13.1, as much as i was alarmed i didn't question it. I have however seen him making 500+bhp subaru's amongst other stuff but have the feeling that he might be talking about an n/a car.

My mum's got a Honda S2000 and that black smokes worse than any other non turbo standard car i've seen.

Anyway, this is for a tuned Glanza/starlet turbo.

I was hopping to get it in the high 11s. As a "safe rich".

L8 ECU,

I can see on the left hand side that the car runs lean when it comes on boost but then drops back to safe at the top end.

I'l try and hook up the laptop later to see if i can log the figures.

This car does the opposite as it hits low 11s when coming on boost and the leans off slightly towards the top end.

I have held the car (left foot braking) at specific load sites and this is when i see the lowest figures i.e. 10.6 at 4k rpm's on full boost.

 

Diesel stoich is very similar to petrol actually.


LPG is 15+ and Methanol is something like 6.

 

no its not,,, simons right

 

I think you are confused


LPG (Liquid Petroleum Gas) and natural gas are two different fuels !

Stoichometric ratio has NOTHING to do with AFR in the sense you desribe.

AFR desribes the ratio of fuel to air.

STOICOMETRIC describes how efficiently it burns.


If as you say diesel was the same as petrol, how do you explain the MPG that
diesel gives over petrol.

 

yes i know LPG isn't natural gas i just quoted that as its the highest Stoich i could think of.

I thought 1 lambda would be the Stoich for each fuel? Lambda is the 11th letter of the greek alphabet with a value of 30.

 

You are right Lambda 1.0 describes perfect combustion for ANY fuel type.

 

i love wikipedia aswell,,, i read that earlyer as i was trying to back my comment up to chip,, and failed

 

But the Stoich of diesel is a little lower than petrol IIRC not 30? Anyway that doesn't matter.

The nets a powerful tool

Its all about how to use it, as up to yet you've been wrong twice in this thread

 

oh i dont mind being wrong, aslong as i learn from it

 

so sleeping with ya mother was wrong, did you learn from that too?

 

yes i did,, only sleep with spikys mother from now on