if I've been custom flashed but have been pulling some timing lately because of the heat I would want to reset the ecu to reset the timing right? But will this effect my custom flash with the a/f ratios and boost control etc.? p.s. i dont have cams or cam gears just stock cams..i have aftermarket exhaust, bov, mbc, intake, and custom flash

 

How do you know timing is being pulled? Have you seen it while logging? Al's tunes usually leave room on the rich side, which means you don't normally go lean to the point of knocking, so that would be surprising unless you've increased your boost with the MBC or unless he custom tuned it in the winter. I don't think resetting the ECU will do anything good or bad, but if you are definitely experiencing knock and pulled timing, then It'd turn down the boost a little bit in the heat...

 

What's your whp?

 

well i think he originally tuned me at 20.5-21 psi and i've been running 22 lately..he did actually tune me earlier this summer it wasnt AS hot but its definitely hotter now. I dont actually know for sure I've just been told its possible since I slightly turned up the boost. I have a walbro fuel pump, new sparks, and his tune so actually I should have probably asked everyones opinion first on whether or not I was pulling timing i guess lol. I dont have a datalogger I was just taking what I've been reading and been told that it was possible let me know what you think based on slightly raising the boost and the temp being probably average of 10 degrees hotter lately at this point in the summer

 

291 awhp 295 awtq on a dynojet

 

Any reason you decided to turn up the boost in the heat of summer when your car wasn't tuned for it? In this heat, even 21psi will cause knock on 93oct, so it is likely that you are experiencing some timing pull at WOT at higher rpms. You should turn the boost down to 20 or so with no more than a 21psi spike. I know it seems counterintuitive, but you can make MORE power with LESS boost in certain conditions, such as those most of us are experiencing now (90+ degrees with high humidity everyday). When I dyno'd 2 weeks ago, my street boost of 21-22psi was causing lots of knock and skewing my hp/tq curves. I still got the same peak numbers after lowering the boost to 20-21, but the curves were much smoother, and the torque did not drop off hardly at all. Of course, I have a pocketlogger to see my timing, so that was helpful. If you know anyone with a logger, just have them plug it in and log a few 3rd gear pulls. It will show your timing advance slowly and flatten out, or even fall on the top end. If it doesn't linearly advance to 19-20 by redline, then you know timing is being pulled...

 

That's why.

I also was tuned for 21 psi on pump and I have to adjust boost when the weather changes. Just last week when we had slightly cooler weather my boost jumped to 22 psi and my 3rd and 4th gear runs were pulling timing. Once I turned the boost down to 21 psi I was flying again. Just ask the modded 99+ Mustang gt that I put 6 buslengths on earlier this week.

 

thanks man I appreciate it. so as long as I turn the boost back down the timing will be fine again?

 

It's pure speculation at this point, but there's at least a good chance that this advice will work. In order to make sure, though, you need to log some runs. There could always be something else wrong...

 

Personally I would leave the boost at 22psi unless you feel any dead spots in the power band, you should have enough fuel on top to keep things running consistent and a spike to 22psi isnt going to drastically affect anything in the tune.

Since its good to do periodically I'd disconnect the battery to reset the ECU, let it idle for 15mins after then bring the car through its rev range a couple times at WOT allowing for cool down in between. It should then stay in its primary map if all things are well as I assume they are. Also, the coolant enrichment features of the stock ecu combined with the somewhat conservative timing i've seen Al run should have you covered.