Last week I had a check engine light and I reset the ecu and it went away. I have been noticing this for a while now but when I am driving say 80mph, my car feels like its going 60mph. And today I just floored it, took it to about 110mph and it felt like I was going 80mph. I know something is not right. I changed the oil and same problem. My mods are JDm header, skunk2 cam gears(untuned), Aem Cai, Apexi N1 exhaust...what could cause this problem of laggness. My car has about 59,000 miles, should I get a valve adjustment, will it fix the problem....NEED HELP fast

 

Valve adjustment has nothing to do with the speedometer. How are you sure you are going slower? Test your speed on the road? with a friend?

What's your CEL?

 

cel was for a bad catalytic convertor...but i think the o2 sensor was just loose....

 

Still has nothing to do with your speedo. Maybe your just used to the power?

 

the engine sounds normal...just the powerloss.....****...u think I need to get the cam gears tuned, because Im in the process of getting a p28 chipped ecu

 

o.k.. is antyhing wrong with tachometer? if not.. then go by gearing..

5th gear should read 4300rpm at 80mph.. thats more than speed limit
4th gear should read 4200rpm at 60mph.. so drive in 4th gear at 4200rpm and see if it feels like 60mph..

get valve adjustment done at least every 15K miles - and its completely unrelated to speedometer.

 

i tried all of that and is right on the dot for the specs..but its not just pulling like it was.....

 

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o.k. so your car is just pulling slow.. nothing is wrong with speedometer if it matches rpm..

 

any reason what could cause it to pull slow?

 

u gained some weight? i think ur just used to the power, i know how u feel sometimes.

 

actually I've lost 10lbs....

 

ttt....help

 

You say it feels slow yet the speedo still goes fast. I say you are used to your car.

The cam gears do not to be adjusted. Your setup should be running fine.