hey guys- this is a retarded question but i know the s2k ecu is sensitive- my car defintely runs slower (almost lethargic) during the mid day- when its hot out. 3 hours later while the sun is going down- just fine. it also does it during the same temp- sometimes runs quick- other times a little slow (mostly in vtec). car had 49k on it- is this normal? thanks

 

Sounds OK, if you're not talking major swings in performance.

Ambient temps and humidity will affect engine performance. Might also be your pattern of use during those times playing a role in heat retention.

 

I was down in the states the other day it was about 100degrees, and a traffic jam, when I went to go in first gear, a few times, I bogged big time. I have heard about heat bog, your problem sounds common.

 

hey im having the same problem!!!!
SUCKS

 

yea its not heat bog- i know how that feels. its more a "my vtec feels like it is not on"- i hear it making noise but its not near as quick as usual

 

I didn't major in Physics, but the way I understand it is that the more dense the ambient air, the greater the acceleration of air molecules when combustion occurs. The affects of combustion in the engine creates the horsepower based on how fast the combusted air molecules are travelling when they light off. A lower air temp will always creates greater molecular acceleration (more dense air) when ignited than a higher temp ambient air. Altitude, temperature and humidity all affect air density. Although my experience in this area is mostly in aviation with turbine engines, the same principles can be applied similarly to gas internal combustion engines. High, hot and humid were all unfavorable conditions for take-off in aviation due to their considerable adverse affect on horsepower. Hopefully, this simple explanation will help you understand why you are losing HP under these conditions.

 

AC + massive heat = Slow2K.

 

wow- thanks man

 

it's heat soak guys, don't worry

 

true true heat sucks at times!