Coolant
 

So when I bought my fd from previous owner I asked about the coolant he used in it and he told me he just uses water along with this water wetter product. Dose anybody know if this is normal??

Define normal? Lol it's lazy in my opinion. Considering rotaries are known for their hot running. Flush it and get some decent coolant in there....I always change my coolant for summer and winter.

50/50 and some water wetter would be just about perfect for street cars.
(water wetter optional)

I would not run just water..that's asking for trouble.

....and get a new T-stat. i'd bet there's not one in it.

Yes, it is normal for race cars because many track events do not allow antifreeze. It is fine for a street car if it is in an area that never experiences freezing temperatures, but if it does freeze then your engine is screwed.

You can read about Water Wetter here:
Red Line Synthetic Oil - WaterWetter® Coolant Additives - WaterWetter®

Distilled water + Water Wetter has much better cooling properties than distilled water + antifreeze. The more antifreeze you use, the worse the cooling effect. Therefore, if cooling is an issue, you want to use as little antifreeze as possible. See the factory service manual or owner's manual for the proper ratio for a given temperature range.

As mentioned you should run a coolant mix with as much DISTILLED water as you can safely for your climate. Coolant has corrosion inhibitors but will grow acidic with age. Both important to consider in a bi-metal engine like ours. Changing it occasionally is inexpensive and easier on the coolant seals too. I prefer coolant specified for Asian vehicles.

I found this to be an interesting article: http://www.superstreetonline.com/how...tem-additives/
And I guess I don't know how to post a link?..