Possible Heat soak????

[Tony C]

hi all,
actually got the car to its first show today after a years work, and engine rework after the malfunc,

drove the car this morning around 7.30am and lambda was reading near normal on the journey,
pulled up at show and looked around,
went to leave at 3.00pm and the car struggled to fire and when she did she tried dying and was getting a lambda reading of 1.06-1.19 earlier this morning idle was 0.93-0.95
on the journey home the car was surging every so offten and the lambda was reading between 1.05 and 1.23
its the first time we have run the car in this heat we have today, anyone know whats causing it?
running alpha 1.1.44

[dnb]

I would suggest heatsoak is the right answer.  Did you manage to datalog the offending run?

I would suggest looking at the enrichment vs MAT & TPS table and increase it by a couple of percent in the high MAT area.

[Tony C]

i would of if i had a laptop :-(
the new sony vaio lappy arrived today,
just need to order the usb/serial adapt then i can do what you said mate. (i hope)

[Tony C]

this mat table does this over rule the ve table then?
so if we tune any cold/hot scales do we tune the mat table? or the ve table???

when i ran the 1.0.73 firmware i never had this table, and also never suffered with heat soak or lean off when hot starting running etc,

just curious how it al works so i can learn a bit more :-)

[gunni]

The MAT table is a multiplication to the VE table .

So this means that you need to tune the MAT/TPS area specifically which is causing the heatsoak.
At higher TPS you might not be getting the heatsoak problem and thus would not be in that area of the table
If you get what i´m saying.

[Tony C]

now i have the usb/serial adapt, i managed to conect my new laptop to the ecu,

have had the car idling for 40mins so the intake temp was around 61C, and tuned the tps/mat table to give a lambda reading of 0.93-0.95 hope i have done that correctly,
need a nice hot day now so i can tune the higher end scale,