drivelikejehu

its around 32 degrees now in Maryland. is my car going to be running better or worse?

i searched and found this thread, but its not exactly the same question
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/weather-affecting-performance-331941/

rynberg

The car will make more power when it's cold out. Drivability shouldn't change at all.

TwinTurbo_SE7EN

correct.

as if you wouldn't be.

DaveW

Watch out for the (high-performance, summer) tires having sudden break-away and low grip in cold weather.

level7

iTrader: (3)

at 32 degrees your motor will be less prone to heat soak keeping your intake temps lower for longer. i swear sometimes driving at night it feels like someone installed a small shot of nitrous without me knowing.

rynberg

Very important point and one that can be surprising!

zonblitz

iTrader: (9)

yeah it's cold here last couple of days... and my boost seems out of control. even with profec B turned all the way down my car wants to make 15 plus pounds of boost. yesterday I turned it down and it seemed to hold a 10-12 lb boost but tonight for whatever reason it wanted to make 15 lbs.

any ideas?

RE-Amemiya7

You are going to have a lot more power. My last week before the car went away for the winter, it was liek 20 degres. I was getting on the freeway and got on the gas too hard. With the cold dense air and ice cold tires, I spun the car out on the entrance ramp, almost put it into the wall! Im just glad there was no other cars on the ramp.

When it gets cold and the air gets dencer, a turbo car makes lots more power! Its fun to drive when it gets cold, just keep your eye on the boost guage (for those boost spikes) and go easy on the freeway entrance ramps! lol.

FallenCho

iTrader: (1)

I had the same experience except it was during the summer and I had just gotten the car washed. So wet tires + hitting the gas to hard on the on-ramp...Yawp! Completely forgot about the wet tires...heh.

bajaman

The nice cold, dense air also has a tendency to make cars run very lean if the ECU can't compensate quickly enough, definitely NOT good for our cars' engines longevity.

Yeah, in the cooler/cold weather you'll SWEAR you have about 50 extra ponies to play with, just like the reverse is true in the nasty ******* miserable bullshit hot weather, where you LOSE at least that amount of power!

GUITARJUNKIE28

and fun

RX-7racer88

Should be better. You will see more power from the turbos and what not.

books

iTrader: (8)

Here are some recorded correction factors (cf) used by Dynojet Dynos. These correction factors use barometric pressure, air temperature and vapor pressure to calculate the correction factor. I believe the correction value is a multiplier for each horsepower data point. For example: if the dyno measures 300 horsepower and the temp is 108F; the SAE corrected value would be 300 X 1.04 or 312. Looking at the relationship between the factors and the temperature one can see that you make more power at colder temps. The correction factors give you an idea how much. Using the correction factors only, one would make 3% more power at 53F vs. 78F.

108F 1.04
88F 1.02
78F 1.00
64F 0.99
53F 0.97