Idle stalling TP Load limit decel
Posted: Fri May 29, 2020 3:55 am
Hi
I have been struggling with this for a few weeks. I have stalling coming down to idle from high engine speed in neutral. Also if I clutch in coming to a stop it dies. Its usually goes rich as can be seen from black smoke as it tries to catch. Its a MAF issue for sure but I cant seem to solve it so far.
Car is a bnr32 rb26 with a single maf conversion R35 GTR maf sensor in a 4" tube with a straightener. Once its idling its ok and you can load it up at idle speed (clutch against the handbrake) and its find good, afr and no stalling. It seems there is no real dashpot function for idle that bumps the AAC as you approach idle target or even a spark dashpot function. The idle stabilisation function doesnt seem to solve it or maybe I still have it calibrated wrong. Is it in the manual?
The MAF voltage climbs much higher than steady idle speed when it tries to catch it clearly false reading so I tried the Load limit decel function but this doesnt seem to function as I expected or explained. I set decel tps to 0.5v trigger
and kept lowering the load limt all the way down to 10 above and below idle speed. TP is around 2000 (7-8) at idle. But it doesnt seem to limit it to the value in the table and I see the pulswidth increasing and TP up to crazy numbers.
I have FP2 but its classed as a FP2.2 function, do i need to reflash firmware for it to work? I see nothing new in the rom packs...
Ill attach the cal file ive been using. I started from scratch to see if I could solve it but alas no.
Log of driving near stall (200rpm!) around 1m 25s
2nd log of stalling in neutral.
Can also see in the driving stall that the hot start is not great (maybe i am missing something) but i havent bothered to look at that yet. Cold start is good.
I have been struggling with this for a few weeks. I have stalling coming down to idle from high engine speed in neutral. Also if I clutch in coming to a stop it dies. Its usually goes rich as can be seen from black smoke as it tries to catch. Its a MAF issue for sure but I cant seem to solve it so far.
Car is a bnr32 rb26 with a single maf conversion R35 GTR maf sensor in a 4" tube with a straightener. Once its idling its ok and you can load it up at idle speed (clutch against the handbrake) and its find good, afr and no stalling. It seems there is no real dashpot function for idle that bumps the AAC as you approach idle target or even a spark dashpot function. The idle stabilisation function doesnt seem to solve it or maybe I still have it calibrated wrong. Is it in the manual?
The MAF voltage climbs much higher than steady idle speed when it tries to catch it clearly false reading so I tried the Load limit decel function but this doesnt seem to function as I expected or explained. I set decel tps to 0.5v trigger
and kept lowering the load limt all the way down to 10 above and below idle speed. TP is around 2000 (7-8) at idle. But it doesnt seem to limit it to the value in the table and I see the pulswidth increasing and TP up to crazy numbers.
I have FP2 but its classed as a FP2.2 function, do i need to reflash firmware for it to work? I see nothing new in the rom packs...
Ill attach the cal file ive been using. I started from scratch to see if I could solve it but alas no.
Log of driving near stall (200rpm!) around 1m 25s
2nd log of stalling in neutral.
Can also see in the driving stall that the hot start is not great (maybe i am missing something) but i havent bothered to look at that yet. Cold start is good.