Adjusting the Ignition Timing of a NA ICE to Spec' for the Atmospheric Equivalent of SeaLevel Conditions that Actually exist @ the Alt @ which that NA ICE is being Tuned For, is Not Tampering > It is the Only Truly Correct Adjustment ~ Most, if not all, of todays Modern NA ICEs DoNot have Manual Adjustments Available Due To the BuiltIn ability to make this Adjustment OnTheFly Via OnBoard Sensors & ECUs ~ For Example, the 2001 EJ25 in My VDubaru has an Atmospheric Pressure Sensor which when in concert with the IntakeAirTemp' Sensor, Allows the ECU to make FuelFlow & Timing Adjustments Based On Pressure Altitude, Not Just Actual Physical Alt' ~ The Sensor that it DoesNot have, that I wish it did, is a Hygrometer, as that would give it the info needed to be able Know the Density Altitude for which it needed to adjust ~ DigiJet & DigiFant were Headed in the right Dir' with their AFM & IAT but Fell Short by Not Adding a Atmos'Press'Snsr & Hyg' ~ ORR ~ DeanB
On 3 Jul , 2016, at 7:38 AM, Dennis Haynes wrote: > Ignition timing also effects emissions, especially the formation of NOx. I > know many don't care but that is why our engines are low compression and > de-tuned. The only thing our engines have besides the low state of tune to > control NOx is the 3 way catalyst and O2 sensor system. VW did what they > could to save money including not adding EGR. Tampering with settings is a > primary reason that almost all adjustment capability has been taken away > from current vehicles. > > Dennis > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > OlRivrRat > Sent: Saturday, July 2, 2016 9:51 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: GOWESTY AFM no start problem > > On 2 Jul , 2016, at 9:58 AM, Dennis Haynes wrote: > >> I wouldn't. For most trips he will be heading down to sea level. > > Are You Sure of That ~ When I asked DJ > > > " @ What Altitude do You Live & Drive Mostly ~ " > > His reply was > > > " Altitude is 1400' to 3500'. We drive down to the Connecticut Upper valley > and a over to the White Mountains. " > > Is this a GoWesty 2.2 ~ If So, What Timing do they Recommend @ 0' > ASL ~ Add Alt'Corr' to that ~ |
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