whats this - FCD??

[grinder]

right then

i have a decatted exhaust , induction kit and a stock A/F gauge

when i floor it - it runs straight into the rich section

now then - can i trust this ??

if thats what the ECU is thinking then surely the A/F gauge is correct ??

and it seems to be doing a stupid amount of MPG ( LOW figures )

is there something i should worry about ??

the only thing different on the car is the lamba sensor thingy - thats only done about 60K

and im getting about .7bar on the boost gauge

[Grizzly]

Whats a stock A/F Gauge? I presume you mean an Air fuel gauge? To be quite honist i\'ve never used one so i couldn\'t tell you what its suposed to read.

How is your A/F gauge plumed in? is it like a Wideband that takes its reading of a sencer in the Zorst?

next thing is where have you got your boost gauge plumed into? is it before or after the IC? and does it go upto .7 then drop back to .6-.6 1/2? (this is why i have a Gauge in psi its smaller jumps).

[grinder]

hiya chris

its not a wide band no

its wired into the back of the ECU - and reads from lean to rich in about 20 segments - and works out the voltage to tell you rich to lean

and the boost gauge - thats T\'d off the pressure sensor

and yes - thats about right but probably goes to .75 then drops to .7

its running very well - but now i think the clutch is playing up ( we have discussed this on another thread !! )

[grinder]

OK - you have confused me !! (easliy done eh !! )

the pump ... you mean fuel pump ??

and what do you reckon about the A/F reading

at 75mph with cruise on - the gauge bouces between rich and lean - i think thats OPEN LOOP ?? .. when you floor it - it goes into the rich area - which i think its supposed to - that proves its not running lean i suppose !!

not sure what to do with the car at the mo ..

on one hand - i need to fit the pump
on the other - i have to sort the clutch

no idea which way to turn and rapidly loosing faith in the FC..every time i fix something , something else just raises it ugly head

[Grizzly]

and the boost gauge - thats T\'d off the pressure sensor

Sounds about right, I use the cap\'d off extra take of on the back of the Inlet manifold.

[Grizzly]

yep i got it and replyed?

Trust me the diffrence in load on the engine between a clutch that is slipping and one that isn\'t is quite a bit.

Does it not tell you somthing about when its making most power? when it slips or not?

Fitting a Clutch is easy if you have Time on your side (O and some Radox when you thinking of doing it?

[TRex]

Jumping back into the fun...  

 Chris... good advise on here m8...  

 Firstly I agree with the boost readings, I won\'t use a gauge in \'bar\' as the increments are not as good as Psi..

 Air Fuel Gauges....
 A \'narrow band\' Air Fuel Gauge, what everyone buys and use as a \'god/safety gauge\', it\'s as good as it is..  useless really when you think about it..
 It\'s a decent indication of whats happening with regard to fuel burn.. But not or never for tuning or even for judging a cars performance!

 They run off the cars standard Lambda/Oxy sensor in the exhaust.(single wire system)
 Oxygen(lambda) sensors are used to monitor the level of unburned oxygen in the exhaust.  The amount of oxygen that\'s left in the exhaust following combustion is a good indication of the relative richness or leanness of the fuel mixture.

When air and fuel are mixed together and ignited, the chemical reaction requires a certain amount of air to completely burn all of the fuel.  The exact amount is 14.7 lbs of air for every pound of fuel.  (stoichiometric) air/fuel ratio or Lambda.
Using a Lambda sensor to monitor the level of unburned oxygen in the exhaust, the sensor tell the ECU when the fuel mixture is lean (too much oxygen) or rich (too much fuel).  To compensate, the ECU adjusts the fuel mixture by adding more fuel when the mixture is lean, or using less fuel when it is rich.  That\'s the basic feedback fuel control loop. \'simple\'

 Right, normal \'Narrow band\' oxygen sensors give on a rich-lean indication.  They can\'t tell the Ecu the exact air/fuel ratio.  When the air/fuel ratio is perfectly balanced, a standard (N/Band) O2 sensor produces a signal of sayyy \'X\'(volts) . when the signal goes \'Rich\', even just a nats c*ck the signal(voltage) goes to it\'s max reading, and when it senses \'Lean\', it goes right down to it\'s min reading.
 No in between..........

 A \'Wideband\' on the other hand, in a nutshell, gives you pratically all the bits in the middle... and quite accurate and safe.

 And closing... as I always say... good things no cheap and cheap things no good!
 Hence why you could buy a \'Single wire Narrow band A/F gauge\' for £15.   and the cheapest \'Five wire Wideband set up is £300 +

 That alone tells the story!

 Discuss....  :guinness

[Grizzly]

Well put..

Let me put it this way, if you want to buy somthing that will acuratly tell you what your Motor is doing buy a Wide band. It would be the best £300 you will spend.(Mine Came with a Great Manual for hours of Bed time reading Fun).

I found it is important you get one with RPM and Data Logging as a function.

This may be a good toy for somone to set up a group buy or somthing to get the Cost down?

Sales Pitch over!!! OK, I realy hate it when i can\'t sleep :o

[Grizzly]

Hey TREX i belive you have cracked the 11\'s

Well done Mate.

[TRex]

Yeah G, thanks...  

 Word gets around then, only a matter of time really as there were many witnesess...  

[Brett]

Right, thread tidied up
I\'m going to let Trex start a thread now, if he doesnt...................:rollin

[grinder]

ok - who made him a mod ^ ??

i know what you mean about the A/F gauge - its a good enough indication for me .. if at full boost it drops to lean - back off quicky

and for price .. ah well chaps you know me ... cost £0.00

so it was worth fitting !!

and the clutch ... errrr yeah it slips when its at high revs ( power ) .. and as far as doing it - when ever really - im just scared

and to keep this on track ... FCD.. yeah yours is the same as mine

[Grizzly]

i know what you mean about the A/F gauge - its a good enough indication for me .. if at full boost it drops to lean - back off quicky

Urm, The measurement is taken from the Exhaust so if it goes into the lean its already happened.

If i was you the first thing would be to fit the fuel pump you have already! it may just give you the extra fueling to help the situation.