Fgxxr8 Posted February 13, 2019 Share Posted February 13, 2019 What afr do these cars run stock? What is the lambda value? What is the stoic value to begin with? Quote Link to comment Share on other sites More sharing options...
finnigan001 Posted February 13, 2019 Share Posted February 13, 2019 On 98 fuel should be 14.63 which would be lambda 1.0 if im understanding what your asking properly. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted February 13, 2019 Share Posted February 13, 2019 You can check this by opening up the stock tune file or reading it from the vehicle. Lambda stoich is usually 14.63 from the factory which they will command at idle and cruise. This is a typical base fuel map for an XR8. Remember there are lambda modifiers as well. Eg exhaust/cat overtemp (0.7 lambda) and enleanment for torque reduction (1.05 lambda). Quote Link to comment Share on other sites More sharing options...
Fgxxr8 Posted February 13, 2019 Author Share Posted February 13, 2019 What about WOT? .8 lambda? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted February 13, 2019 Share Posted February 13, 2019 1 hour ago, Fgxxr8 said: What about WOT? .8 lambda? Yaxis is throttle. 500 is roughly 45% So 0.87 dropping to 0.75 Quote Link to comment Share on other sites More sharing options...
Fgxxr8 Posted February 13, 2019 Author Share Posted February 13, 2019 Is that .75 at WOT? Quote Link to comment Share on other sites More sharing options...
Fgxxr8 Posted February 13, 2019 Author Share Posted February 13, 2019 That is a 11:1 afr? Rich Quote Link to comment Share on other sites More sharing options...
finnigan001 Posted February 13, 2019 Share Posted February 13, 2019 Check out this guys channel... some really good tuning info and explained well. With boosted cars it’s not uncommon to see 11:1 thru to 12:1 Afrs. There are other factors as to why some people run richer than others such as air intake temps. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted February 13, 2019 Share Posted February 13, 2019 34 minutes ago, Fgxxr8 said: Is that .75 at WOT? Are you taking the piss? 1 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted February 13, 2019 Share Posted February 13, 2019 Hanlon's razor @Roland@pcmtec 1 2 Quote Link to comment Share on other sites More sharing options...
Fgxxr8 Posted February 13, 2019 Author Share Posted February 13, 2019 No not taking the piss. Someone said earlier the 500 value was 45% throttle. What would be the value for WOT. Not on that table. Quote Link to comment Share on other sites More sharing options...
Fgxxr8 Posted February 13, 2019 Author Share Posted February 13, 2019 Trying to work out differences between stock tune and custom tune afr. Im told most custom tunes are 11.8:1 afr at WOT Just want to know what stock values are Quote Link to comment Share on other sites More sharing options...
trav1s Posted February 13, 2019 Share Posted February 13, 2019 Basically, the 500 load cell is your WOT fuel, like Roland said, once it hits around 590AD counts, the computer thinks your at WOT. So .87 lambda would be around 12.7AFR then it dips down 11.8AFR @ 5k RPM, then 11.0AFR at the top end. Please someone correct me if this isn't the right information. 2 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted February 13, 2019 Share Posted February 13, 2019 25 minutes ago, trav1s said: Basically, the 500 load cell is your WOT fuel, like Roland said, once it hits around 590AD counts, the computer thinks your at WOT. So .87 lambda would be around 12.7AFR then it dips down 11.8AFR @ 5k RPM, then 11.0AFR at the top end. Please someone correct me if this isn't the right information. Yep this is basically it. The WOT setpoint is defined by another scalar however as this map only goes to 500 the PCM will peg the values at this bottom row from 45% onwards. Quote Link to comment Share on other sites More sharing options...
Fgxxr8 Posted February 14, 2019 Author Share Posted February 14, 2019 Thanks thats great info Quote Link to comment Share on other sites More sharing options...
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