Oil temps and boost
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 7,156
Likes: 154
From: The Arid Sunny Desert
Oil temps and boost
I took a 30 mile drive today with the A/C on and noticed that my oil temps hit 237 degrees, coolant at 230 and tranny at 225. This was 60 mph highway driving with little to no traffic. When I floored it to see how much boost I was making I noticed that the gauge hit only 4 psi. Normally the car sees 7 psi on cool days. Was the reduced boost a result of high oil temps, pulling timing or was it because the A/C compressor was engaged or a combination of both? Are these high temps normal?
In another thread I posted how the car felt much less powerful this morning, due to the 85+ degree weather. Normally when I floor the car from a 50+ mph rolling start, the car takes off like a bat out of hell. Today when I did the same thing she felt like she was laboring and very sluggish. It's fairly obvious that FI setups do not like the hot weather and I'm sure that my tuner severely curtailed the timing in the hot weather so that I don't blow my stock bottom end to pieces just yet.......I'm sure that he doesn't want me blaming him for the catastrophe. This will be my first summer with the FI setup so I'm learning as I go along. Looks like the days of 180 degree oil & coolant temps with the tranny at or below that level are history. Thanks for listening to me rant.
In another thread I posted how the car felt much less powerful this morning, due to the 85+ degree weather. Normally when I floor the car from a 50+ mph rolling start, the car takes off like a bat out of hell. Today when I did the same thing she felt like she was laboring and very sluggish. It's fairly obvious that FI setups do not like the hot weather and I'm sure that my tuner severely curtailed the timing in the hot weather so that I don't blow my stock bottom end to pieces just yet.......I'm sure that he doesn't want me blaming him for the catastrophe. This will be my first summer with the FI setup so I'm learning as I go along. Looks like the days of 180 degree oil & coolant temps with the tranny at or below that level are history. Thanks for listening to me rant.
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
Lower air density with higher temps hurts power on any motor. It's normal to drop some boost with higher temperatures on a centrifugal, but not almost 50%!
Pulling timing will hurt power, but it won't drop boost on the gauge.
Something else is wrong.
Dirty air filter; leaks; belt slip; blow-off valve not closing?
Pulling timing will hurt power, but it won't drop boost on the gauge.
Something else is wrong.
Dirty air filter; leaks; belt slip; blow-off valve not closing?
Race Director
Joined: Jan 2003
Posts: 10,838
Likes: 1
From: Volusia. Las Vegas FL, NV
It was 99 degrees today when I drove and it was running 228 water temperature and 234 oil while in traffic. Water temp went down to 198 and boost was at about 6PSI. I saw about 1PSI of loss.
