mixture setting tips!!
Posted
Local Hero
mixture setting tips!!
PLEASE read paulc's afr thread.
the idle mix screw gives the afr a value which is maintained throughtout the revrange due to the mechanical nature of the kjet system.
it actually HAS to set up a safe afr.
i am talkin about a standard dx, as thats whats mostly on here! tho the principle will apply to a modified car runnin kjet ie NOT ecu controlled.
rebuild in progress....
Posted
Settled In
"it actually HAS to set up a safe afr"
How? I'm new to Golfs so would like to know how AFRs are set up/corrected
Posted
Local Hero
the 'idle' mixture screw is the base value the afr is set to.
the fuel flows, not because of any other controls than the air plate and wur.
fuel pressure could have an effect but only if it was seriously low. that would then be indicated by a lack of power when you put your foot down, it would probably idle and run ok tho.
there is no other fuel management system on these cars than the idle screw…….
pauls thread:
The Mk1 Golf Owners Club
rebuild in progress....
Posted
Local Hero
JSeaman said
Have you got a link to this thread?
"it actually HAS to set up a safe afr"
How? I'm new to Golfs so would like to know how AFRs are set up/corrected
Its set by reading the CO level at idle. This is typically done using a gas analyser, the cheapest which is around ?75 these days, I think. For those who don't have one and can't justify buying one, there are 2 options:
1. Take it to a garage (who do have one)
2. cabriaulait's method above
Do you know how CO varies with AFR?
Do you know the relationship between AFR and cylinder temperature?
Do you know where the lean misfire limit is?
Do you know how AFR varies with rpm, on a Golf GTI?
Unless you knew this, you wouldn't know when your engine was about to enter an unsafe running zone.
Suffice to say, VW's recommended method (and pretty much every other manufacturer's, at the time - no cat to damage) is safe enough.
Posted
Settled In
Before I do please clarify that your stamp on the brake pedal method isn't recommended by VW?
Posted
Settled In
Your questions about CO, AFR, cylinder temps etc just go to back up my point about guessing the tune.
"Unless you knew this, you wouldn't know when your engine was about to enter an unsafe running zone. "
You would with an EGT sensor and wideband electronics. You don't by pressing the pedal
"VW's recommended method … is safe enough"
But is this their recommended method?
Posted
Local Hero
Posted
Local Hero
Posted
Settled In
Posted
Local Hero
Bert said
But how much is 1/8 of a turn :wink:
Bert
Thank god i have a diesel 8)
Do you mean how much the AFR varies, if you turn the metering head screw 1/8 turn? Or how much the CO varies?
Posted
Local Hero
i dont have the afr problem i use a lc-1 and to be honest you could run very lean with a k-jet lump without any engine problems ie melting pistons ect
Posted
Local Hero
itll show no difference if already correct tho :wink: thats the idea.
rebuild in progress....
Posted
Settled In
Posted
Local Hero
Posted
Settled In
Posted
Settled In
1983 1.5 GX FOR SALE! pm for details.
Posted
Old Timer
Posted
Old Timer
Daily - 05 plate B6 A4 Avant S Line, with 19s for the summer.. wifes car - Rare Seat Exeo ST Sport 170 Tech
Weekend - MK2 20vt monster - Plus a mk1 caddy I am fixing for my bro
Posted
Local Hero
M7R said
if anyone in the notts area wants to have a play on a C02 machine let em know.
CO
Posted
Old Timer
Daily - 05 plate B6 A4 Avant S Line, with 19s for the summer.. wifes car - Rare Seat Exeo ST Sport 170 Tech
Weekend - MK2 20vt monster - Plus a mk1 caddy I am fixing for my bro
0 guests and 0 members have just viewed this: None.