My car seems to haul when i first start it up b4 it warms up and gets into the closed loop i guess. There is def a big difference i dunno if it is from the engine takin in the hot air or not but i think it always acted this way. There is alot more top end i notice also. Its not a huge deal since im swappin it out soon but just wonderin what some people thought.

 

mo L03 never seems to haul..

i attribute that to the fact that its a L03.

 

it just runs alot better b4 it warms up

 

eh, mines about equally slow all around.. warm or cold.

 

I am not sure exactly what your problem is ,but your engine definetly runs better cold , I havent really ever been able to tell the difference but track times definetly show it , the colder the air the better it combusts . So that is probably it . If not I dont know what to tell you.

 

These engines like it cool.

 

ive never noticed much difference cold vs. hot. It seems a slightly more smooth when warm but thats about it. BTW, its never good to be harsh on a cold motor. Let it warm up first before you do anything drastic.

 

yeh i know its not good to be harsh on a cold motor .Just noticed more power today when i thought i would get on it. I usually never do but figured what the hell its comin out neway. It pulled good right up 2 redline.

 

Well, it seems rather obvious that none of you guys live in the south... Yes, your car WILL run faster when your engine is still relitively cool. Thats atributed almost COMPLETELY to the fact that the air isn't being heated as soon as it gets into the intake tube. And as every car guy should know:
Cold Air = Condensed Air = Better Air/Fuel Mixture = Faster Car
If you install an Open Element air cleaner onto your car, this effect will be multiplied hardcore in both extremes. With the open element, your no longer getting air from outside the car, your sucking in the air off the engine block. So right when you turn the car on, its faster then the stock setup. As soon as the block heats up and you start sucking in the hot air from the engine compartment, it slows down.



Move to Arizona and don't even plan on racing anyone till November....

 

yeh i know cold air makes more hp but damn i didnt think it would make that big of a diff

 

Also before the car is warmed up, the computer is adding more fuel to warm the motor up. So the added fuel during the warm up period could be a better mixture of air/fuel than after the car is warm. So you might try doing the afpr and get a fuel pressure gauge and richen up your fp 1 or 2 psi and see if that helps.

 

Hop it up on a dyno with the A/F meter installed.
Or drive around with any data logger running (WinALDL for example)

Tweak accordingly

 

fastlookin thats a thought i bet thats what it is doin

 

Really? I've never heard that before...are our cars new enough to have that kind of fuel system in them? Does make sense, adjusting your fuel psi is always a good kicker, but also take into consideration why they make 'Cold Air Intakes'....both could make for a nasty combo...

 

yeh havnt u seen on some tpi cars they actually have a extra injector used only for cold starts to add more fuel.

 

Ohh really? I never have had much of a chance to look under the hood of the TPI cars, even though I have one on my racing team....go figure...

 

yep, the earlier tpi cars had teh cold start injector to help richen up the mixture on cold startups. GM did away with it on the later tpi models.

 

there is also the fact that the computer is in open loop when its cold so its just folowing the fuel tables with no input from the O2. This alone can have a big effect on fueling since the ecm wont intervine and add or remove fuel to try and get it closer to stoich.

 

yeh thats kinda what i was tryin to get at in the beginin of the thread i thought it maybe had somethin to do with it not bein in closed loop yet

 

Well, your getting out of my range of car-knowledge now, also, I live in Arizona....whats a cold start??....