[Diy_efi] Re: standard Motec curve and the Hydra EMS curve

[Tim Marsteiner]

Good insight. 

Thanks Phil and Michael.

I've smoothed out my IAT correction curve a bit and
bumped up the ignition and things have gotten a bit
more consistant.

I took a thermocouple and poked it through the air
cleaner a few inches and captured its reading along
with my bikes IAT. There is a large discrepency (10-15
F)... both in response time and absolute temps. There
is definitely some heat soak with the factory IAT
sensor. I will rig up a different mounting system and
see if things improve.

Thanks,
Tim

--- Phil Lamovie <phil at injec.com> wrote:
> 
> IAT correction is done differently by OEMs and the
> AfterMarket
> Ecu (AMEs).
> 
> Aftermarkets would (should) always start with the
> default curve
> generated by the absolute relationship between O2
> content per
> unit volume VS IA temp.
> 
> This should not have any "wiggly bits" when graphed.
> 
> On the other side OEM have a world of issues to deal
> with other
> than great acceleration, max power and some minor
> concessions
> to fuel economy.
> 
> No OEM can avoid the gms/kWHr game with all it's
> attendant
> cost and complexity.
> 
> Given that they sell turbo charged vehicles with 5
> year powertrain
> warranties they are forced to choose between
> retarded timing and
> fuel restriction at high IATs thus over heating
> their warranted turbos
> or using the customers money to cool said device.
> Guess which one
> they choose.
> 
> phil
> 
> 
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