Car won't start under 30 degrees
 

I just bought my evo 8 5-6months ago before the cold season started. Was running fine only took a few cranks on cold start before it would fire up. I recently bought a new odyssey 680 thinking the battery was the problem. But still if not worse cant get the car to start let alone crank. I mainly get a ticking sound until I jump mine is when I finally will get a few cranks. Havnt gotten it to start in probably 3-4weeks since this winter has got worse. But once it does start it starts up right away after the engine is warmed.

Things I've noticed my back windows will go down a inch or so after a few failed cranks. Or the windows will be fully down after the battery has died after sitting for a few days. I'm guessing I'm drainin power from somewhere as well.

My guess is my tune done my innovative. Looking to get a new one from STM in the next 3-4months
Any tips? Ideas?

Very likely a tune issue. What fuel are you running?

bump have same issue

put a higher cca battery in. the 170 cca of the Odyssey isnt enough for some in cold weather.

I have factory tune, with the pc680 and I have to put the jump box on it anytime it's that cold. Battery is only 2 months old. They just can't handle starting in those temps

im running e85 with 351whp.
i figured it was the low battery cca but wasnt sure. what battery do you guys use/recommend for my cold temps. western new york we've been in the negatives past few days

Braille battery, B2015, is what I run. Has not let me down yet during Chicago winters. Even when it was in the negatives fired right up with no jump. Has 425CCA which is pretty high for a small battery.

First things that come to mind -

1 - Injector Pulse Width (IPW) for E85 cold starts may be off. Before I modified my tables, my motor was a 4-6 crank attempt bandit. Now, first time go!

2 - What the choir has said, Cold Cranking Amps (CCA) may be too low. I use the PC925 personally and it has 330 CCA (94% more than the PC680). I started it the other day with a full coat of ice on the car (15 degrees) on the first attempt.