boXXer

for a turbo charged car? (escort turbo to be exact)
And what would be classed as "running rich"?

Cheers!

lead_foot

iTrader: (1)

On boost or off boost?

I'm not sure what the "perfect" AFR/Lambda or "running rich" would be, it different things to different people

I would say mid 11's on boost would be "good" depending on the EGT.

boXXer

i meant on boost I heard something about Lambda 1 once. That make any sense?

JamesH

iTrader: (21)

I thought T34 is 11.8 on boost to be safe

Not sure about off boost

Christian and Beccy

iTrader: (14)

Certainly NOT lambda 1.0 on boost!!!

Each tuner has their own idea, so no real answer to that.

Disabled Account

Here is a set of good AFR figures, fron Stu's Saph (MSD).

Ignore the figures within the red lined area as those are too lean, and the reason why Stu changed the fuel pump.

Jonzy

Is that a good guide for all petrol turbo motors?

boXXer

thanks for that. Much appreciated. Gives me some sort of idea anyway.

Stavros

Gonna depend on spec and personal preference.

Some people say 12s are fine (seems daft on a turbo car).
Most say somewhere in the 11s.
Some cars run in the 10s and seem to be best there.

boXXer

ah ok. So no real set rule then. I was told my car is running very rich, and knocking the power out, so bought a wideband and gunna stick it on to see what happens.

Jim Galbally

problem is boxxer, even if you do find it rich, yuo've got to take it to a pro to get the map adjusted.

that pro will have his own wideband.

just seems a bit of a waste of money for the purpose you want it for.

if you wanna keep an eye on things for safety, great
if you want something to use to DIY map, great

if you just want to diagnose a fault, Ł300 quid is quite a bit of money

tabetha

Lamda 1 is the term given to STOICHMETRIC MIXTURE or 14.66:1, ie 14.66 parts of fuel to 1 part air, generally termed 14.7:1 as this is close enough.
This will NOT however give you MAX power for this a RICHER mixture of around 12:1 gives most power, some that go richer may be doing so as a safeguard, as this lowers the temps in the chamber.
Turbo size totally irellevant to MIX strength, it is the cobination of boost(air) and fuelling that determine these.
Anything below 14.66: is rich, anything above is lean.
Running a richer mix will result in better or increased MEP mean effective pressure.
tabetha

boXXer

Im not using it to set my car up. Just to see what is happening. Anyway, i thought you could adjust Ke-Jetronic yourself? maybe im wrong.

Jim Galbally

i assumed you were talking about the cossie

ke-jet has limited adjustment on it, you wont really get it perfect everywhere, a lot of it is compromised. works fine on standard engines, but when you start modding stuff the standard system struggles somewhat

Jonzy

So mid-low 12's on boost would be acceptable... its not a YB btw

c0ss1e9i6

Can you fit a wideband Lambda sensor in place of a normal one on an Escos, and split the signal between the ECU and an AFR meter?

I would like to keep an eye on things!

boXXer

Sorry Jim i meant the S1. I will have a fiddle tomorrow.