When I see deformed leaves (like in the pictures), I think insects. If the leaf still has a normal round shape but still crinkled, then I start thinking watering and over/under fertilizing... But it isn't a topic I've researched thoroughly, so I just posted as well.

My leaves are wrinkled like yours, but the outside shape is round and not deformed. I hope I'm making sense...

http://forums.gardenweb.com/discussions/3253129/m=23/crinkled-leaves

I'm going with insects because of the deformed shape of the leaves (at least in the bottom photo). You might want to check out my post in the link just above this post. In that, it is virtually certain that the issue is from extreme heat.

How hot is your chili plant getting in the afternoon?

It gets around 90+ at max and 65 low

That's not too hot as long as they've been watered. May want to think about bugs.

Agree with Marianne as mine are in full sun over 100F and get watered every four or five days or so. Strong sun hurts the fruits far more than the leaves and in itself won't kill peppers. They'll sort themselves out in time. If you worry about sunburn, shade the plants, either with other plants or any kind of cloth or wood slats or similar.