I have an 89 gta with a 350 and for the first 10 mins. i'm driving it, it has a ton of power spins wheels effortless and squaks tires from 1st to 2nd.Then when it warms up the car seems to lose the power.Any suggestions?

 

Sounds like your losing power when the EGR opens. Some people say they disconnect the EGR for more power. Just a thought.

 

Ummm no...EGR valve might be sticking open is so fix it dont remove it....egr removal gains NO HORESPOWER if it was functioning properly....EGR only functions at steady cruise as soon as u punch it, it stops so it like all other emissions devices dont really hinder performance....now what exactly is ur problem? im not sure...u only "feel" a difference in power doesnt mean there actually is....

 

There is no problem .Just wondering why? Its apretty noticeable difference even my old lady said it didn;t pull as hard when i punched at a light 10 mins later.

 

I think this is normal. A cooler engine will perform better, but not better for the engine. I find the same with my car.

 

well heat is the enemy of power to a point....once everything gets good and heat soaked you are gonna naturally lose some power

 

I got the same issue, it really sucks. is there anything I can do?

 

.... I don't know about it being literally ten minutes, but, your engine is running much richer with an open circuit. When the loop is closed, the air fuel ratio isn't as rich, nor is it really ideal from a performance perspective, mainly from a emissions. Try bumping up the fuel pressure some. If that doesn't work, is it possible hot air is making it's way into the air inlet, meaning, are you running one of those oxymoron cold air intakes, where the filter is right next to the engine?

 

im sorry but im a novice, how do you increase the fuel pressure? thanks

 

You'd need to install an adjustable fuel pressure regulator, it's a very straightforward install, even for a novice. I see that your in New Jersey, ever hit Raceway Park....?

 

No I haven't, were is it?

 

On the back of your fuel rail....

 

I ment where is raceway park

 

^ .....

Click Here....

 

switch your fan switch to turn on at cooler temps... 200 or 176... 225 is hot enough to kill performance and engine life.

 

Ive noticed the same , when cold its roaring like a beast but as soon as it gets warm , no more beast..:-( When i scan with datamaster I can see that there is some knock retard at wot , and my guess is thats whats causing the bad performance. not sure if the knocking is false or true , hard to tell. When engine is cold and in open loop the ecm isnt monitoring knocks , correct?
And engine is on basetiming , maybe this is whats causing the differences in performance hot-cold?

 

your base timing maybe off...

or a sensor going bad..

 

I know the 700r4 gets hot and gets sluggish

if you dont have one already get a trans cooler

 

your leaving out one major part. when taking out your egr valve you are open to removing your smog pump which give you one less pulley, a smaller belt and well less stress on your engine which means you actually will gain some horse power.