Weird AFR dips between shifts, ideas? OBD1/Crome
#1
Weird AFR dips between shifts, ideas? OBD1/Crome
So my car has been running a perfect 11.8-12:1 AFR in WOT, never had any troubles.
Until last night at the drag strip
between each shift, when i got back onto the throttle, it would hesitate for a split second. Lucky for me I datalogged the passes.
For whatever reason, that hesitation is a dip in the AFR's to almost dead on 10:1 (sometimes 10.5 or 10.9:1) but I can tell its holding me back pretty badly.
Question 1: Could this be a symptom of a blown headgasket, I've been wondering if I've lost that cause I have a coolant leak and I cant find a dripping hose, just losing coolant and I can see it on the undercarriage. I plan on doing the ARP's and a new HG as soon as I can (money $$ )
Question 2: my clutch was slipping pretty bad too, could it be a side effect of that?
Car still idles normal, still pulls hard, doesnt smoke...
thoughts? comments? suggestions?
Until last night at the drag strip
between each shift, when i got back onto the throttle, it would hesitate for a split second. Lucky for me I datalogged the passes.
For whatever reason, that hesitation is a dip in the AFR's to almost dead on 10:1 (sometimes 10.5 or 10.9:1) but I can tell its holding me back pretty badly.
Question 1: Could this be a symptom of a blown headgasket, I've been wondering if I've lost that cause I have a coolant leak and I cant find a dripping hose, just losing coolant and I can see it on the undercarriage. I plan on doing the ARP's and a new HG as soon as I can (money $$ )
Question 2: my clutch was slipping pretty bad too, could it be a side effect of that?
Car still idles normal, still pulls hard, doesnt smoke...
thoughts? comments? suggestions?
#3
Re: Weird AFR dips between shifts, ideas? OBD1/Crome
Originally Posted by xenocron
Sound like you need to work on your Throttle Tip-in when tuning.
here it is
the datalog is attached, change the file extension from txt to zto and open in zeitronix datalogger software.
#4
Re: Weird AFR dips between shifts, ideas? OBD1/Crome
Zeitronix datalog software http://www.zeitronix.com/images/disk1-V2.0.1.zip
#6
Re: Weird AFR dips between shifts, ideas? OBD1/Crome
Originally Posted by sohc_mshue
sounds like you need to adjust tip in.
#8
Re: Weird AFR dips between shifts, ideas? OBD1/Crome
Originally Posted by projekteg
what's your 'fuel modifiers' (if using uber), 'individual fuel multipliers' (if using crome) set at?
#10
Re: Weird AFR dips between shifts, ideas? OBD1/Crome
Originally Posted by projekteg
fuel tools (calculator icon in toolbar) -> advanced
really odd, i was looking at those earlier and they were greyed so i couldnt change them, opened it again to look at the names on the 4 fields, and they're no longer greyed, very odd. sadly im not gonna be able to do much about this now for a while cause i cant datalog, my laptop is buggin out on me again, i think it possibly fried memory again. poop.
TurboEF9 was talking to me in the beachhouse, doesnt seem to think its a tip-in issue.