desert whomper

ive noticed my 91 toyota pickup has WAY more power at night, i think, im not too sure if im right on this but its cuz of the cold air is more denser with oxygen so it can burn more fuel. is this right? anyways is there a way to make it to were my car has more power like this during the day, also my idle is the same at night and day, dont know if that makes a diffrence.

jimbo74

if its colder at night then yes, there could be a power difference... unless you want to run an air to air intercooler or try and run a cold air ram induction there isnt much you can do about intake temps durning hte day in means of being cooler

ctcost

the three H's all govern performance in an air breathing engine...High (altitude), Hot and Humid. Air loses about 1 inch of mercury per thousand feet of altitude in density. Can't remember the temp and humidity specs offhand. Only way to add more power is supply more air flow (ie boost like supercharger or turbocharger). FIPK kit, airbox mods...etc will also help. Ekkk...almost forgot headers and bigger exhaust pipe to relieve a little back pressure.

Rick F.

I can't imagine that there would be "WAY more power" due to the day-to-night temperature change. Are you sure that it isn't a visual thing such as not being able to see points-of-reference at night? Oh, wait! Maybe it's the resistance due to the light of day that is slowing your car down... Which way are your speakers pointed and do you play your radio at different volumes day vs. night?

Just teasin'...

Bumpin' Yota

lol

However, I too can attest to that change of power as well. At night when below 60F the truck would actually run pretty damn good and could keep up with domestic v6 suv's (still loose but on their bumper.) But get the temp above 95 and I bet the truck didn't have 50 rwhp...

Getting my exhaust and FIPK helped that out SOOOO much. Now when it's hot the truck still gets up and runs. Cold temps no change.

ctcost

you did say desert runner right...yup...temperature change. You can compensate in differing degrees as above. I have a 91 also (you have a V-6 I presume?) and don't know if there's a supercharger for our rigs but I'm getting ready to do the airbox removal mod (just use the search button for this one). I'll let you know what I get in extra power when it's done. Definite second on Bumpin' suggestions.

Better to keep the motor normally aspirated anyways (superchargers are better that turbochargers cause no turbo lag but still, more to maintain in an older rig).

ctcost

Bumpin' what's the ECT mod?

Fink

Do a search on the ECT mod and you'll find a bunch of info on it.

Fink

ctcost

Thanks fink.