lamrith said:AJP does not seem to think it is all heat/timing issue and I defer to him and others on that...TopherSho said:AJP turbo said:TopherSho said:
Back on topic. i *Suspect* the spark tables were overly influenced by the temps. IE they are pulling too much spark, but that would necessitate fiddling with the formula .. and i am not comfortable with that simply because here in oregon the temp drop too fast from day to day and i'd hate it to push to much spark on cooler days...
Just to clarify, I think you may be overestimating the tune corrections and the effect on spark...But what shouldn't be underestimated is the effect of heat on spark
So your spark is pretty good for 92 octane as is most of the pre 2013 SHO's...The gen 1 cars seem to tolerate more spark for some reason...In the heat I still don't see why low 13's should be a problem to achieve so overall I'm surprised...Actually I would've guessed your car to do better than most on a dyno or track for a pump gas car.
I lift some of the spark limiters on your tune which will result in higher spark even when nothing else is touched, provided the knock sensors are happy which your's always were.
Then in your case, I added 1 more degree to your spark tables.
now for some to be pulled....For your IAT compensation tables. in stock form at 1.5 load and 150 IAT2 your tune would pull about 3 degrees of spark...THis gets done in the spark calculation you will not see this in the knock sensor....I change the multiplier so that at the same load and IAT2(1.5 and 150) 5 degrees would be pulled....That way the spark is pulled in the final calculation a bit more than stock. 2 degrees in your case that way the knock sensor should be happy and it's more likely the spark will be added by the knock sensor...I'd rather do that than have the knock sensor pull...When the knock sensor pulls they do it quickly and abruptly
So your IAT compensation is pulling 2 more degrees than stock but only at high IAT and HIGH load....But you have 1 degree added to the base tables so at times you are only netting 1 less degree but that all is offset by the limiters I've removed to allow more spark and don't forget the knock sensor being allowed to add spark back in.
In all honesty, you could be a bad tuner and get away tuning ecoboost because the Knock sensors and OAR values will just get things back to where they need to be....That's also one reason you can make mass produced tunes for wide distribution across the country and fuel octane.
I don't like saying maybe the car is "tired" but even in the heat I would think it would run faster....I know I've seen identical cars run differently
Yeah 'tired' is a weird phrase for me since I just broke 50k miles. I have a handful of logs you and I ran showing it can run high 12's from this spring so don't quite think it's worn out per-say.
But PIR's heat did kill it.. I might have to take off the trim and open the radiator cap and peak inside.. wonder if there is acid damage or corrosion inside.
BUT, scientific experimentation is half the fun!
Not sure if PIR opens for full day of drag strip at all on weekends? If not you need to come up this way for a day SIR (Sorry Pacific Raceways, but to old timers it will always be SIR) is open on a weekend! Just thinking if you run on a cool day or in morning before it gets really hot but as track comes around it will rule in/out that it was all heat related. Pretty sure Pacific has all day drags coming up in a few weeks, June 10th. Gates open 7am...
I am also looking strongly at heading to a dyno up here in the future, if you wanted to make a trip up for that. I found a Shop in Auburn WA that has an AWD Dynojet.
PIR only runs the Test-n-Tunes 5pm-11pm, so only after the heat of the day has hit.
Hmm might be worth a shot. we can meet up. 1st let me make sure my car is working right. I need to make a pass once my adjusted rev-17 tune from AJP soaks in with the new T-stat. And I want to explore the effects of taking off the splash guard and possibly replacing the Air-HE that is pelted all to crap and looking into the HE for the Turbos.
also plan on clamping a few hoses with c-clamps after seeing pics of a few disconnected tubes ..
*IF* it all lines up, when would you go ? we can meet up and throw down the track and get slapped by ladies ..