I just took my car out of storage in the beginning of the week. Ive been driving the car like a grandma letting it warm up...etc


Well today I decided to get on it. My temp was about 170 and I laid alot of rubber (Been driving for a while, tires were warm). Later on taking it home my temp was around 220 and at the same stop sign, I got on it and only barked them. Does heat really kill performance that much?


By the end of next week I plan to have my fans be turning on at an early temperature anyway. Was just curious, thanks

 

I thought there was a rule of thumb for heat and power, but I forget it. But having the car run cooler will definately give a little more power.

 

I think I have the same kind of issue. In the morning when I go to skool, if I totally get on it I can get 2nd gear scratch, or 'bark' as you call it. Once it gets into the day, when I leave skool for the life of me I can't get 2nd gear scratch. I'm thinking it's cause my tires warm up and the road is warm too...

 

Yea thats probably it. When coming home, the car had been driven for a good 45 Minutes easy.

 

Engine Temp........Is a huge factor in performance. Youre car runs best right after start up......Even when youre engine temp is low it still wont run as good as it would right after starting her up in the morning.... Thats why Cold Air Induction helps so much.... COLD IS GOOD!!!

 

The heat usually transfers into the intake charge, which makes hp #'s lower.

As a general rule for you guys, when the oil is cold it is very thick. It doesnt lubricate parts very well. So all your interal parts are not coated with the protective oil. When you run it hard, all it's doing is damage.

Why do you think turbo cars aren't allowed boost until warm? because the oil cannot lubricate the turbine and it cokes it.

 

True Thats why I wait for my oil pressure to drop before I do anything. So I know the cars warm.

 

I've got a fair bit of expereince with TPI motors and can tell you that they are particularly sensitive to temperature.

Not just engine coolant temp but underhood temps and intake air temps as well.

Stock TPI motors run the strongest pretty much ice cold. Run 'em up to 220* with the fans on and they're much weaker. Noticably weaker, as you have seen.

The TPI intake is a long mess of aluminum tubes and a big aluminum plenum. When it gets hot it has a LOT of surface area to radiate heat into the air in the intake, reducing performance, but that's only part of the story. Additionlly, the Manifold Air Temp (MAT) sensor screws right into the bottom of that plenum and basically cooks in there when the plenum gets hot. 170* MAT sensor readings on a hot motor are not uncommon even on a mild 70* day. All of this adds up to the intake air being hot, and the ECM thinking it's even hotter than it is. All of this is bad for performance.

Just bypassing the Throttle Body cooling lines, installing a 160-170* thermostat, kicking in the fans at a much lower temp (190* versus 228* stock) and relocating the MAT sensor over into the air filter box and make a seat-of-the-pants difference in performance on even a stock TPI engine, runnign fully warmed up.

BTW- you don't acutally have to unscrew the origianal MAT sensor from the bottom of the plenum- just buy another one and extend the wires/plug over to it.

Short answer- yes, heat kills performace, especially on TPI motors.

 

Thanks for that reponse!


I did a little test tonight. I went to the same stop sign, got on it, didn't even go full throttle, and let off of it. The results


(Low sound, turn up your voume) TPI sure does like To be cool. I drove around for a bit, and its decenetly warm here, so my tires werent cold.

Movie, car at about 180

 

Oh, man you need to get a longer vid.

 

Yea, hehe. Earlier today I ripped em for a SUPER long time. I gotta save my tires, so I pussed out and let off it

 

yeah, heat does drastically affect power. i think if you take any car right on startup and floor it, you'll notice a significant difference from a warmed up car. heat also affects engine life GREATLY.

Probably the main explanation for this is as the temperature goes up all the metal expands; increasing friction.

now of course...there are ways to make a hot engine make more power than when its cold....but thats a much more advanced course....

 

Definitely. My brother has been playing with his gtech lately and ran a bunch of 5.2 0-60s during the day. Right now it is much cooler and he ran a 4.9.