light load surge finally nailed

[Ward P]

TRE will have no effect (change of parameters) on 5th Gear as in fact it loads all gears to 5th gear ignition table. You will find most of the problem will be in low end fuelling and is usually at light throttle where the IAP A/F and TPS A/F are floating from one to the other and if the settings are not correct as they jump back and forth to each other the transition creates whats felt as surge effect. To lean in the IAP settings will create the "hunt" effect also
Remembering also that all TRE does is effect timing (in lower gears) and with timing change comes A/F change so to not set fuel up after TRE fitment really does not give a good appraisal of TRE benefits obtained.

But thought this would also bypas the GPS which "from reading" may be the cause of surging?? - maybe beers at your place soon methinks??

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Shit !!! what are you doing up in South Indonesia!!