I have a 2005 MCS
with about 85,000mi. I have added an alta cai, and an msd ignition coil, and a 15% pulley(with cooler plugs). The car was running pretty good after the msd upgrade(immediate hp increase) so I thought the pulley would give even better results. So far after the pulley install (3000 mi.) I have noticed a reduction in gas mileage and the car seems to take longer to spool up and doesnt seem to have as much torque as before. I was getting about 27 before now about 25.5. I have not changed my driving habits. If anything I am driving a little slower because just doesnt feel lively any more. Only feel a real increase on cool misty days because of the denser air. I did the pulley myself so its possible i could have forgot to connect something but dont think so.
I did get new tires. I was running 215 40 17 nonrf and changed to 215 45 17nrf so increased weight but wouldnt think this would make that big of a difference.
The install requires the ecu and battery to be disconnected so it should have reset itself with the new pulley by now.
It also seems to have to rev a lot higher to get up to speed. I used to not have to rev much above 4500rpm now find myself having to go to about 6000 rpm.
Maybe I just need to run the heck out of it for a while.
Maybe i am just jaded or expected more but just feels like my car is lacking that spark or sizzle it had. Any help would be appreciated. Thanks Eric