Bud Taylor

Looking for some data for 3.8 engine with and without 3rd radiator

Without 3rd Radiator
Highest "Spirited" Driving Temp
Highest Track Temp

With 3rd radiator
Highest "Spirited" Driving Temp
Highest Track Temp










Can anyone with a 3rd radiator and the 3.8 engine tell me how hot they run during spirited driving and tracking driving ?. How about track driving. What is normal full operating temprature for the 3.8 without the 3rd radiator for sprited and track driving ?

SpeedZ

I’d be curious to hear from people with the 3.4 engine as well. I’ve yet to hit any heat issues with my 3.4 without the 3rd radiator.

I think 232F was the highest I’ve seen for oil temps.

thebrit86

The 3rd radiator comes with the Sport Chrono option correct? If so I usually see 198-217 with the Sport option engages in my 3.4 C4. Around 248 without sport engages after a hard pass to around 111mph in 80 degree weather. As soon as I pushed the Sport button the temp dropped from 248 to around 217 in under a minute.

Inbyten

~275 on track without vs ~255 on track with the 3rd radiator. I just had it installed. 991.1 C4S

groundhog

10 to 15 degrees C difference (~ 30 degrees F)

flgfish

I don't think so. No 3rd radiator on my 2015 C2 with SC.

Tampa991

991.1 C2S - Highest I’ve hit without the 3rd radiator 280 oil / 212 Water...I’ve got the 3rd rad sitting in my garage. Haven’t had a moment to install it yet. Will post back.

garfunkle

3rd Radiator comes standard in some countries like Saudi Arabia. In the US it came with X51/GTS cars as a part of the power kit.

tgavem

ON the .1

No more 3rd radiators on the .2 991. Reserved for the GT3 - RS and GT2's

thebrit86

Interesting. Then I guess my question is what causes the oil temp in my 3.4 to drop 20-30 degrees in oil temp in under a minute? I figured it was dumping oil from the other radiator. Can't be just a fan coming on especially at speed.

arter

You can order one for the 991.2 from suncoast if you want.
I have one, not sure I needed it, but do like the lower temp max on track.

tgavem

If you have a base 3.4, no 3rd radiator, been that way since 997.

tgavem

Correct, and their kit fit nicely and I installed it. I asked about after market products and shop recommend factory as it has a better fit and plenty efficient.

flgfish

There is a COV that enables "something" when you turn on Sport mode that cools the oil further... maybe the "heat exchanger" mentioned here?


https://4.bp.blogspot.com/-UKh9a4Vfx...BSchematic.jpg

from here: http://plenums.blogspot.com/2016/10/...-overview.html

Tampa991

Just got home from the track - The FIRM in Starkey FL





Oil temps:




Without 3rdRadiator
Highest "Spirited" Driving Temp : 255
Highest Track Temp: 275 (lower ambient temps)

With 3rdradiator
Highest "Spirited" Driving Temp: Havent tested
Highest Track Temp: 277

Air temp: 95 degrees / Humidity 85%

With the 3rd radiator - oil temps still went to the 270's - BUT the car quickly recovered to lower temps when slowed down.

Another positive is that the water temp did not fluctuate like it did last time. Water temps went up to 210 without the 3rd radiator when I was there last.