Hey i'm planing on doing a coolant flush since i'm planning on changing my ast i was woundering what would be the best anti freeze for the rx7?

 

Just get the normal Prestone stuff. It's nothing to obsess over..

 

and use distilled h2o

 

Make sure it does NOT contain any silicate compounds in it. It binds to the inside of the rotory and prevents effective cooling transfer. Some coolants have this compound.

 

Good advice to use distilled. Even better, IMO, is Mazda's Extended Life Coolant, part # 0000 77 508E 20. It's pre-mixed for you, no need to buy distilled and do the mixing. On top of that it's good for "up to" 5 years. Don't let it go that long. Be safe and change it at 3.

 

Never heard of this.

Got some references for it?

 

I think antifreeze is the only thing that FD owners do not obsess over.

I've never understood why because everything else requires elaborate debates involving next to no real evidence.

 

Would the nothing to obsess over still count if you track your car almost weekly? I've just been using what my mechanic puts in and never really gave it any thought either. Maybe I can lower my cooling efficiency by switching to something else?

thewird

 

alright thanks alot guys

 

Better cooling comes from better airflow. That will do more wonders for your radiator than some special coolant.

 

Evans

 

Last I checked, heat transfer efficiency of straight distilled water was better than any anti-freeze mix. You may just want to use distilled H2O with a rust inhibitor such as Water Wetter . Of course, put in anti-freeze come winter.

 

[QUOTE=dhays;8396393]Last I checked, heat transfer efficiency of straight distilled water was better than any anti-freeze mix. You may just want to use distilled H2O with a rust inhibitor such as Water Wetter . Of course, put in anti-freeze come winter.

True - but remember that antifreeze also raises the boiling point. Anti-rust additives such as water wetter don't, and as a result, cooling system internal pressure will increase, putting more load on seals, hoses, etc. With our hot-running, tempermental engines, that can be a problem.

Dave

 

Your pressure cap will relieve that extra pressure, so with the proper cap no matter what you run for coolant you will not see over 13psi.

I always run at least 25% coolant, not only does it raise the boiling point but it also lubricates the pump much better than a tiny bottle of water wetter. Nothing against water wetter, but its target market is supposed to be for racers and not regularly driven street cars. If you want to use it go for it but dont leave out the coolant.

Oh, and I usually just run Sierra. It slightly safer so the neighbors cat or dog can drink just a little more before they get sick and die.

 

[quote=DaveW;8396439]Yeah, your right. The boiling point of H2O with a 13 psi pressure cap would be about 245 degrees. Prestone 50/50 gives an increase in boiling point of about 15F at 15 psi so maybe an increase of 13F to 14F at 13 psi. However, that won't increase internal pressure since you have a pressure cap. The only problem is that if your coolant gets to 245, you will have boiling problems where with anti-freeze you would probably be good to about 260F

 

So my best option is distilled water + water wetter? Is it one bottle for the whole system?

thewird

 

IMO, your best option is to use a lower percentage of coolant and a lower temp thermostat (since you track your car). BTW, I do use Royal Purple Ice but I can't say it's actually done anything. I bought several bottles of it so I just keep using it until it's all gone. I don't think I'll buy any more of it though.

A buddy of mine ran Cools Like Ice for years on his track based FD and swore by it:

http://www.vichubbard.com/auto-part-...prb-4030g.html