Fargo Posted April 22, 2008 Share Posted April 22, 2008 Guys, just fitted an FCON V (already setup for jspec bpu i understand) and at WOT im seeing an AFR of 10 (via aem) i understand this is not good correct. At idle 14.7-15.4 Have noticed though since fitting the overall drive is better, throttle response is crisper. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 22, 2008 Share Posted April 22, 2008 At WOT 10AFR is a bit on the rich side, some might say safe, ideal is 11.2-11.5, and 14.5-15.4 is fine at idle/closed loop. Quote Link to comment Share on other sites More sharing options...
Fargo Posted April 22, 2008 Author Share Posted April 22, 2008 10 isnt disastrous then. Quote Link to comment Share on other sites More sharing options...
gaz1 Posted April 22, 2008 Share Posted April 22, 2008 no as said its a bit rich, but better than lean;) Quote Link to comment Share on other sites More sharing options...
Fish Posted April 22, 2008 Share Posted April 22, 2008 Isn't 10 the minimum reading on the AEM gauge ? therefore possibly richer than indicated which might not be so clever - you may benefit of datalogging (if possible) or perhaps dyno'ing to get an accurate AFR curve. Quote Link to comment Share on other sites More sharing options...
Fargo Posted April 22, 2008 Author Share Posted April 22, 2008 yes indeed 10 is the lowest, certainly i noticed at WOT there is a pause between 10.4 to 10.2 then 10 then its really time to come off the pedal, so i'm hoping that its not going further. Quote Link to comment Share on other sites More sharing options...
JamieP Posted April 22, 2008 Share Posted April 22, 2008 Isn't 10 the minimum reading on the AEM gauge ? therefore possibly richer than indicated which might not be so clever - you may benefit of datalogging (if possible) or perhaps dyno'ing to get an accurate AFR curve. Yup, wont go lower than 10, it could be very rich, get it checked out. Quote Link to comment Share on other sites More sharing options...
Alex Posted April 22, 2008 Share Posted April 22, 2008 Sounds good to me - nice and safe. You could see a V Pro mapper about it, BUT, you'd probably have to buy a whole new map as they tend to be locked down (or did you have it fitted?)...would the cost be worth it? It's safe and it works...I'd take that! Quote Link to comment Share on other sites More sharing options...
Fargo Posted April 22, 2008 Author Share Posted April 22, 2008 got it used from bolabag, have pm'd to see if its locked, have got an ex Tdi tuner available to remap at £80 an hour, from what he has told me hks dont support the fcon v due to age and comms issues, however they will do a deal on a newer version (rz i think he said or the newer IS version) Quote Link to comment Share on other sites More sharing options...
Wez Posted April 22, 2008 Share Posted April 22, 2008 You just plugged an aftermarket mapped ECU in your car and did some WOT pulls Quote Link to comment Share on other sites More sharing options...
Fargo Posted April 22, 2008 Author Share Posted April 22, 2008 lol yup, that about the size of it Quote Link to comment Share on other sites More sharing options...
Wez Posted April 22, 2008 Share Posted April 22, 2008 lol yup, that about the size of it Fair enough, 10 is a little rich matey, really want that back into mid 11s around there. Quote Link to comment Share on other sites More sharing options...
Homer Posted April 22, 2008 Share Posted April 22, 2008 Oh my god Don't start it again until you get a base map loaded at the VERY least. Ideally get it on a trailer and take it to your mapper. It's insane to start it without even a base map for your injectors. You are very lucky you've not melted a piston, though a leakdown test is advisable after this. Quote Link to comment Share on other sites More sharing options...
Fargo Posted April 22, 2008 Author Share Posted April 22, 2008 was already mapped for 440's Quote Link to comment Share on other sites More sharing options...
Angarak Posted April 22, 2008 Share Posted April 22, 2008 Doesnt running too rich cause bore wash overtime? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 22, 2008 Share Posted April 22, 2008 Doesnt running too rich cause bore wash overtime? Bit of a difficult one that, in theory yes you would expect very low AFRs would cause accelerated bore and ring wear over time, but as far as the 2jz lump is concerned i.me not convinced, mainly due to my findings on front main seal/oil pump problems, as if the oil can be fuel contaminated enough for the oil pump to be worn, then how can compression and leak down tests show a good seal, yet a worn pump? Also going on to other types of engines, and in particular V8 and older carb engines, which can run very low AFRs as std yet go on for mega mileages. Quote Link to comment Share on other sites More sharing options...
Wez Posted April 22, 2008 Share Posted April 22, 2008 Doesnt running too rich cause bore wash overtime? Yes. Quote Link to comment Share on other sites More sharing options...
Alex Posted April 23, 2008 Share Posted April 23, 2008 The stock setup runs into the 10's, to be frank it doesn't sound like the Fcon is doing a lot. Quote Link to comment Share on other sites More sharing options...
Ryan.G Posted April 23, 2008 Share Posted April 23, 2008 10's on boost at over 5k do not cause bore wash but if it is running say 10's on cruise and idle when its warm then it will over time. The stock setup runs 10's on boost just the keep the cylinder temps down as with the cats in place the cylinder temps will get very hot on boost. Pretty much all forced induction stock setups run 10:1 on boost at the high RPM. Damn Vauxhalls run low 9's after 6k on some of their models Ryan Quote Link to comment Share on other sites More sharing options...
Fargo Posted April 23, 2008 Author Share Posted April 23, 2008 on stock i was seeing 11.5, define cruising (at 70 or 30 or 40) seems that the jury is split as to 10 being ok or not.. Quote Link to comment Share on other sites More sharing options...
Wez Posted April 23, 2008 Share Posted April 23, 2008 I would say 10 is bad for idle and cruise. On full chat its not so bad. Quote Link to comment Share on other sites More sharing options...
Matt H Posted April 23, 2008 Share Posted April 23, 2008 well your power will be suffering as a result, i'd want it to be higher.. lean and mean and all that Quote Link to comment Share on other sites More sharing options...
Alex Posted April 23, 2008 Share Posted April 23, 2008 well your power will be suffering as a result, i'd want it to be higher.. lean and mean and all that Lean and mean = rebuild, cause you had some sh1t fuel... 11's dead fair enough. Quote Link to comment Share on other sites More sharing options...
Matt H Posted April 23, 2008 Share Posted April 23, 2008 Lean and mean = rebuild, cause you had some sh1t fuel... Of course there is a balance, but i'd still want it higher than 10 yeah. x Quote Link to comment Share on other sites More sharing options...
Fargo Posted April 23, 2008 Author Share Posted April 23, 2008 I would say 10 is bad for idle and cruise. On full chat its not so bad. cool, my idle and cruise is all good, just at WOT is concerning. Quote Link to comment Share on other sites More sharing options...
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