Matt H Posted November 1, 2007 Share Posted November 1, 2007 Had an AEM wideband gauge installed yesterday, displays some lovely digital numbers, which im so so clued up on but was just wanting to establish a clearer picture about what im reading. E.g, what should there perfect readings be under various conditions, e.g, idle, normal driving and under load, and what should i be looking for if there is a problem. Basically, i dummys guide to reading the AFR gauge Ta Matt Quote Link to comment Share on other sites More sharing options...
bromy Posted November 1, 2007 Share Posted November 1, 2007 Someone please correct me if I'm wrong : Idle :14.7 but will jump about a little Cruise : 14.7 Under load : WOT 11.5 When you jump off the throttle it will jump off the scale (weak) for a second or two so dont worry Quote Link to comment Share on other sites More sharing options...
Matt H Posted November 1, 2007 Author Share Posted November 1, 2007 Idle and cruise is fine, but under load its about 10.5 Quote Link to comment Share on other sites More sharing options...
TrickTT Posted November 1, 2007 Share Posted November 1, 2007 Thats not far off what you would expect on a stock ecu. If you've got an aftermarket ecu it would be worth aiming for around 11.0 on wot. Quote Link to comment Share on other sites More sharing options...
Alex Posted November 1, 2007 Share Posted November 1, 2007 10.5 is still safe. Quote Link to comment Share on other sites More sharing options...
Matt H Posted November 1, 2007 Author Share Posted November 1, 2007 It does creep around the 11.00 mark too, think it wavers around, but more predominantly 10.5, it has gone all the way down to 10.00 as which is the bottom of the scale. So i take it the lower the number the leaner the mix? Quote Link to comment Share on other sites More sharing options...
Wez Posted November 1, 2007 Share Posted November 1, 2007 So i take it the lower the number the leaner the mix? Nope, lower numbers are richer and higher numbers lean. Quote Link to comment Share on other sites More sharing options...
bromy Posted November 1, 2007 Share Posted November 1, 2007 Who did the map? Hyper? Quote Link to comment Share on other sites More sharing options...
tDR Posted November 1, 2007 Share Posted November 1, 2007 It doesn't sound like they spent too long mapping it if it's 10.5:1 most of the time and still goes as rich as 10:1 (maybe lower? I think that's the limit of the AEM gauge iirc) Still, it's plenty safe... just kinda defeats the point of having an aftermarket ECU IMO. Lower number means richer BTW. Cheers, Brian. Quote Link to comment Share on other sites More sharing options...
Matt H Posted November 1, 2007 Author Share Posted November 1, 2007 So whats the perfect number then when booting it? 11.5? Quote Link to comment Share on other sites More sharing options...
Matt H Posted November 1, 2007 Author Share Posted November 1, 2007 Who did the map? Hyper? yeah Quote Link to comment Share on other sites More sharing options...
Matt H Posted November 1, 2007 Author Share Posted November 1, 2007 Still, it's plenty safe... just kinda defeats the point of having an aftermarket ECU IMO. I thought that a stock ecu wouldnt supply enough fuel for higher boosts. An after market one you can program it to change that. after all its because my car was running to lean it blew in the first place Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted November 1, 2007 Share Posted November 1, 2007 I suspect Brian means that an aftermarket ECU can normally maintain very accurate AFRs, and get closer to the 'ideal' so it seems odd that its been left really rich in many places, like a half arsed map. Yeah its safe, but there is safe and then there is wrapped in bubble wrap with a big cotton wool blanket and a large box safe... Could possibly be losing power Quote Link to comment Share on other sites More sharing options...
bromy Posted November 1, 2007 Share Posted November 1, 2007 I would take it back to Hyper and tell them your concerns about it being overly rich in certain places and see what they say Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted November 1, 2007 Share Posted November 1, 2007 Your WOT is too rich mate. As previously stated your almost certainly going to be losing power. Get it remapped by somone who knows what their doing! Quote Link to comment Share on other sites More sharing options...
Matt H Posted November 1, 2007 Author Share Posted November 1, 2007 Wot is WOT? Quote Link to comment Share on other sites More sharing options...
Muffleman Posted November 1, 2007 Share Posted November 1, 2007 wide open throttle mate, foot in the carpet Quote Link to comment Share on other sites More sharing options...
Wez Posted November 1, 2007 Share Posted November 1, 2007 WOT = Wide Open Throttle Quote Link to comment Share on other sites More sharing options...
suprafan72 Posted November 1, 2007 Share Posted November 1, 2007 Get it mapped by a famous AEM Mapper we all know and love and you will see AFR's in the mid to late 12's... amazing huh!!! Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted November 1, 2007 Share Posted November 1, 2007 Get it mapped by a famous AEM Mapper we all know and love and you will see AFR's in the mid to late 12's... amazing huh!!! Which mapper would that be? Quote Link to comment Share on other sites More sharing options...
mr lover Posted November 1, 2007 Share Posted November 1, 2007 Which mapper would that be? Dimitri is the AEM man isn't he ? Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted November 1, 2007 Share Posted November 1, 2007 Ahh that famous AEM mapper Quote Link to comment Share on other sites More sharing options...
Wez Posted November 1, 2007 Share Posted November 1, 2007 Am I missing something here, what ECU are you running? Quote Link to comment Share on other sites More sharing options...
bmx1lew Posted November 1, 2007 Share Posted November 1, 2007 i am busy learning all this, i bought a book called building and tuning high preormance Electronic fule injection by ben strader. i've learnt so much, i've just finished tuning maps and basic engine calibration, next step is AEM and Motec , i need to get a laptop and get my hands dirty but there's so much to learn i'm considering doing some Motec course's. any one here got any tips on where to learn more, any advise or help would be great Quote Link to comment Share on other sites More sharing options...
bmx1lew Posted November 1, 2007 Share Posted November 1, 2007 10.5 is still safe. i've learnt that standard is round 12.2 - 12.5: however under high boost levels you should give your engine lots of attention as you will need to run allot richer also around 30psi it's not uncommon to see arf of 10.5:1, but you need to have a well serviced engine, and should keep an eye on your spark plugs... is that right? Quote Link to comment Share on other sites More sharing options...
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