Toyotarx7

iTrader: (13)

just need some feedback



eliminating the AST....good idea? or bad idea? i have the metal one already and a koyo radiator with a greddy front mont IC. i saw a link from robs's website and he eliminated his, i was planning on doing the same, just need opions from people who has done it already.


thanks everyone

7_rocket

iTrader: (6)

Search, lots of people have done this and with no ill-affects.

sickboy2345

http://www.fd3s.net/coolant_tank_elimination.html

search under my name - was asking same question..

MyRedFD

iTrader: (1)

The AST on mine was eliminated before I got it and runs just fine as far as temps go. I only have a stock gauge but the needle pretty much stays right in the middle, with maybe a little fluctuation towards hot when in stop and go.

Toyotarx7

iTrader: (13)

hmmm...idk if i should do it or not...i mean i read that artical and pretty much its just there to eliminate tiny air bubbles, and the 2nd gens dont even come with one, so it makes me wonder as to why did mazda put it there to begin with ..... what do u guys think...should i do it?

MyRedFD

iTrader: (1)

Lots of people have done it without any problems and if there is a how-to from a respected source on eliminating it then I don't think there's a problem. The elimination is just to get rid of a poorly designed part that is a very common failure point, but since you already have a metal one and not the stocker you can just leave it alone.

7dust

iTrader: (14)

Whatever you do, stay away from those HELP rubber caps.

Just sayin.

djseven

iTrader: (56)

I have done it on over 30 cars over the years with no ill effects, I see no need to keep those things as it is just asking for more trouble with a cooling system that already doesnt have the greatest track record over the years.

Toyotarx7

iTrader: (13)

how will keeping it cause problems in the long run

MyRedFD

iTrader: (1)

As I said in a previous post, it eliminates a failure spot. The car will run just fine without it so he's just saying that getting rid of it will reduce the chances of failure in your cooling system.

thewird

iTrader: (8)

I wouldn't take it off if you plan to track the car. But for street your probably fine without it. Just make sure its a quality AST so it won't fail.

thewird

Toyotarx7

iTrader: (13)

ok so i eliminted the ast. .......and i elminated the coolant overflow tank...do u think that was a bad move elminating both? what do u guys think?

GARCO MOTORWORKS

I get rid of the ast tanks but not the overflow tanks .

Toyotarx7

iTrader: (13)

is it 100% nesscesary to to use the 2nd gen filler neck?

Toyotarx7

iTrader: (13)

aight so heres the latest..... i eliminated the AST. i did NOT use the 2nd gen filler neck, in fact i eliminated both the ast AND the over flow tank and only have the the two hoses to the raditor and back into the engine... i have a PFC w/ a commander and ive been monitoring my water temps. i keep a constant 81 degrees at low rpms ( 1700ish - 3000ish ) at no boost. once i allow boost to come in and the rpms go up to maybe 5000 the highest. the temp jumps to 83 degrees and stays there!!! i can hit red line, boost , u name it and it stays at 83 degrees. after the car has been running for about an hour the temps. slowing go up NOT passing 86 degrees. i have the greddy water pump pulley, greddy rad. cap, koyo radiator, new radiator hoses and i mixed my own mixture of wate and water-wetter ( about a 90-10 ratio ) what do you guys think....please comments and opions are welcome.


also how do u guys feel about the over flow tank gone. i mean i really found no purpose for it there ya kno. i was thinking if i to take it out of the car completely i'll run my intake to where it was for much cooler air. its still in the car just not hooked up in anyway, what do u think?

SLOASFK

iTrader: (5)

The overflow tank is to relieve pressure in the coolant system. I wouldn't run without you're running Evan's NPG+ or some other 0 PSI coolant. If the pressure gets too high, it could blow a hose or a coolant seal.

I do have my AST deleted and am running a Koyo N-Flow radiator and I'm seeing about the same temps as you, 80-85, though they get a little higher when I'm cruising because I don't have an undertray.

Toyotarx7

iTrader: (13)

[QUOTE=SLOASFK;8390928]The overflow tank is to relieve pressure in the coolant system. I wouldn't run without you're running Evan's NPG+ or some other 0 PSI coolant. If the pressure gets too high, it could blow a hose or a coolant seal.

that evans NPG+ is that special coolant stuff right?

SLOASFK

iTrader: (5)

Yeah, it's pretty special. It boils at like 375 degrees.

at the bottom of the page http://rx7.com/store/rx7/fdengine_cooling.html

Toyotarx7

iTrader: (13)

ok thanks, i'll make sure to install the over flow tank asap.

DMoneyRX-7

iTrader: (2)

I have wanted to delete my AST for a while but I'm delaying it because it is getting pretty hot and I like the extra coolant the system holds because of it.