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  1. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Not sure if my previous post went through...apologies if its a double post. Went to the local drag strip for test and tune last night, have a data log and current tune. Looks like fuel got really lean at the top RPM range of each gear and peak boost, adjusted some of cells that were highlighted...
  2. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Wish I had a video leaving a cruise in the other day, nothing stupid but with cold tires and 50º weather it didn't take much to break them loose :D
  3. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Trying to work through some minor drivability issues, cold start the car oscillates for a few seconds before stabilizing at a nice idle, also noticing a slight stumble when blipping the throttle, sometimes having to feather the clutch a little to get going. Adjusted some of the Accel/Enrichment...
  4. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    @a91what latest data log from last night, same tune as above. Car feels strong all the way through second gear, usually spins the tires about 3000rpm, shift to 3rd and around 4000RPM under boost I got a drop in RPM and similar in 4th, almost feels like it did when the plugs weren't gapped...
  5. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    I still see spots where I'm leaning out and feeling an RPM drop, not sure whats cause it or if theres still some adjusting needed on the VE table. It seems most pronounced around 4-4500 5-7lbs of boost. Ive attached data logs.
  6. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    No, Autolites. Car feels pretty strong through the RPM band then feels as if Ive taken my foot of the throttle for a split second.
  7. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Got a chance to data log tonight, I notice as I go into boost range of about 5-6lbs and about 3700-4000 RPM it feels as though the engine surges as though Im losing spark(did this before, decreased plug gap and it went away.) Im using all stock ignition, plugs gapped to .038 wondering if I need...
  8. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Enjoy driving this thing! Still have some minor stuff to get figured out, hard to start after reaching operating temp and letting it sit a few minutes, any fast movement of the throttle seems to make it stumble and sometimes a slight back fire 2nd and 3rd gear.
  9. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Im about to go drive some today, before work sends me out of town for the rest of the week. I noticed hot start after sitting for a few minutes requires me to open the throttle just a bit to get it to start.
  10. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Is VE Analysis good for some of this fine tuning? When I run it on one of the posted data logs with cell change to hard, it recommends very small changes to the VE table.
  11. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    a little more spirited drive today and some logs to go with it. Im noticing almost a surge when wide open or 3/4 throttle similar to when I got to large of a gap on my plugs.
  12. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Ill try it out tonight, thanks! Idle seems ok, It seems to pause at 1500RPM then down to 900RPM, Ill try to make a log showing that, it doesn't drop to the point of cutting the engine off on deceleration with AC on or off.
  13. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    No worries, Im in Greensboro for most of the day. I was looking at some notes I have on injector dead time and required fuel, what I have written down is way off what we have in the tune, but the car seems to run fine. I can't remember which were the numbers you gave me from your excel file for...
  14. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Driving was MUCH better, still not crisp throttle when you initially blip the throttle. Heres some logs the one ending in 17.42.57 is with AC running.
  15. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    same tune Ver as above 5.1.1, still have some drivability issues, hesitation, bucking at part throttle. I believe it is what you suspected and that it needs more fuel. I haven't messed with any of the tune, wanted you to look at the data logs first.
  16. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    I do not have a data log driving, I will try to get something to you, currently cutting out my old cat back.
  17. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Installed new IAT sensor drove the car some, it seemed lean at idle and driving 14.6-15.9 so I enriched it a bit to get idle closer to 13.2-13.4. I notice a lot of bucking and stumbling at partial throttle 1/8th throttle range smooths out at 1/3 to 1/2 throttle. I also seem to have to use a lot...
  18. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Looks like the IAT had failed, will continue working out the bugs in the morning.
  19. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    Data log with changes, seems like the recovery after letting off the throttle is oscillating back and forth a bit now
  20. AUBURN1111

    1992 5.0L mustang MS2 PnP, heads, cam, intake. Idle with AC on?

    datalog showing RPMs swings from 900-2600
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