It seems to me my engine is running hot --running 2500 RPM in 6th gear down the freeway Temp hits about 210 and oil temp is 185 --

I have built motor w/Greddy TT -new GWR 50ccc radiator -using Distilled water with additive as coolant
Thermostat seemsto be opening about 185

I just installed Delphi gauges (oil temp , water temp and Boost)--do they need to be calibrated or verified /adjusted
I would appreciate numbers experienced by other TT cars or thoughts

Thanks

 

Well I am in Pearland and on the freeway i am seeing 170 to 180 coolant temps with outside temp in the 65-70 range. 210 seems kind of high with the temps in Texas right now. Do a search and read about Evans NPG ( I think thats the name) Its what some of us high whp guys are using. It really works.

What distance on the freeway? and what was the outside temps at the time.

I have the same gauges and the only adjustment you have to do is set the warning limit.

 

Thanks for the info--Looks like I have something not up to par --The outside temp in Sugar Land is about the same -I'll look up Nelsons NPG --Shariff swears by EVAN coolant but I don't believe coolant is the issue --Water Pump? Maybe I still have air in the coolant --

 

it's Evans

I see around 185 coolant temps on the highway with outside temps of around 86, and that is with regular 50/50 coolant and darton midsleeves

oil temps around 200-210

are you sure you don't have the gauges mixed up?

 

I meant to say Evans.... Yes Sharif uses it in my car.

His temps does sound like he his them mixed up

 

I'll have to check the wiring ----I thought the oil temp was spot on where it sould be at 185.

I was reading the research on Nelson and quite a bit of research is available on evans vs distilled water w/ additive.

 

210 water temp seems high, especially cruising on the highway.

Where is the temperature sensor placed on your car, the uppper hose or the lower hose ?

Comparing cars running Evans to cars running Water is not a one-to-one comparison. Cars running Evans typically report a higher operating coolant temperature. Evans is more efficient removing heat from the engine, hence the coolant temperature reported by the gauge is higher when compared to a similar setup running water.

Here in alabama its been cold this past week and I'm amazed at how fast my car will warm up with Evans installed. The oil is up to 170 deg after idling for only 15 minutes in 30 degree weather. That's much faster compared to when I was running water, another benefit of Evans not many realize until you experience it.

 

Its Evans....You dont add anything when using it.

 

well if they are like mine, they are temp gauges so they are identical and since I don't drive it that often I go by the temps to remember which is which

 

For those who roadrace, what kind of oil temps do you see at the track?

 

250-280 F Oil
220-240 (with evans)

After a lot of hot laps in hot weather. Perfectly safe with Evan's. We even did a tear of our first Evans raced engine....looked brand new, as many of you may recall.

We are working on additional cooling strategies, mostly suited for race cars. You will never get an engine this hot the street (unless you blow a head gasket or something)....you'll end up in jail first..LOL.

 

I get similar temps on my JWT530 track car. In really hot weather, about 100-105 in CA, oil temp does go north of 270 to about 280, but by that time the water is too hot, anyway. I'll be upgrading my raditor pretty soon and will add two big fans to keep things cool.

Does evans really make that much of a difference? I'm surprised because usually straight water is the best coolant. Antifreeze helps lube things up but have always hears that water was the best heat exchanger.

 

That is true. However, the benefit of Evans is that is has a very high boiling point, and eliminates localized areas of air pockets and hot spots. The high temps aren't what kills an engine. What hurts an engine is when regular coolant boils and cavitates and creates pockets of air and super heated steam. Evans does not do this....the cylinders are completely bathed in coolant...no bubbles or air or frothiness.

I am waiting for Raj to chime with a more scientific answer.

 

Can't beat that answer!

The only part to add is that because it is true that the heat carrying capacity of water is higher, the rest of the cooling system needs to be more effective to compensate to maintain the same AVERAGE coolant temp as with water. It's really the ability to avoid steam pockets and super-heated hot spots that allows Evans to run safely, even when hot. You must be certain there is no water contamination when running Evans because of this.

 

LOL. I love Evans as well, and often use it with our built motors. It is not cheap, not easy to install on a motor already running water (as you must drain completely, including drain plugs in the block), and does not drop your temperatures - but it provides awesome protection against bubbles and vapor that will kill a motor quickly.

 

There you go...nuff said.

 

Good to know.

 

Thanks for all the comments and info -- I'll disconnect my temp sensor and see if my water temp guage works. This should tell me if I have it wired to the right guage.

Another site I found pretty good info is below which came up when I searched as XKR suggested.

http://www.rx7club.com/showthread.php?t=99933&page=2

I was concerned about running at 210 and damaging the engine but looks like I can actually go quite a bit higher .

I will definitely use the Evans , Shariff was kind enough to sell me. I like to participate in track days and overheating has been an issue. Hopefully , The larger radiator and evans will help.

Another quick question -- besides the good looks -does a hood with vents provide any significant help with engine cooling with better air flow out of the engine capartment thus better air flow across the radiator ?

 

You may want to just try the evans first, if it solves your problem it may save you money as well.

+1 on the hood question

 

To the hood question - I was having overheating issues at first but after adding a new OE front bumper with cut-outs to the left and right of the Nissan hamgurger and also a monster cut-out for the oil cooler, plus a new underbody tray, Greddy radiator airflow thingy and CF Seibon hood with 3 vents on each side, the car runs much more consitent temps now.

I was also worried about what temp level was OK, so I compared to Steve Millen who was running his FORD GT with us and he wasn't getting any higher than 220 hot. He thought 270 was way too high. So I did a little research and the JDM NISMO website actually has a page dedicated to their oil cooler kit, and after having it translated, their kit is supposed to keep engine oil temps at about 270F. So I figure 270 should be OK...so far no issues even at CA Speedway where we regularly hit 150 mph. Smaller, low speed tracks are a little more precarious as your RPMs are always higher and airflow is less. Either way my interior heater is set to max. Also - the position of your oil temp. sensor is important.