Car Lost 80hp And 5psi Boost

[Guilt-Toy]

Had a issue with my car for the last few months, was chasing boost leaks, looking at blow off valve leaking etc etc....

Never really put much effort into it untill last week when i put the car on the dyno and found the issue after a few runs....

Had 5 runs on the dyno all were showing around 15psi and 330 - 340 rwhp after changing all the cooler hose clamps and some silicons, cleaned out the intercooler etc etc....

Took the air filter off to inspect the turbo to make sure it is still in good condition, decided to do one more run before giving up and going back to the drawing board....

Next run showed 20psi and 405rwhp straight away, a gain in 75 horse power at the rear wheels and 5psi boost!!! because the air filter was not attached! (boost was so much higher that it blew the boost line off for the dyno)

The city in Georgia is sooo dirty that this poor filter got clocked soo bad that it was restricting the GT35r soo much it was choking the hell out of it!

I have cleaned the filter about 3 times in the last 6 months but obviously I was not cleaning it good enough and it was still blocked.

So far I have managed to clean it to give me 20psi of boost but the power is still down so looks like a new filter will need to be imported!

Thought I would share this with everyone, its amazing how much power you can lose from a dirty air filter!

Might pay to dyno your car with the filter removed just to see how much restriction is actually there!

[Adriano]

Interesting that when the vac hose blew off, the graph didnt go to 0 psi, did it come off totally? Maybe there is some calibration?

[GTR-32U]

Thats amazing that the place is so dirty it would block the filter in such a short time.Just imagine what its doing to your lungs...........

Edited April 4, 2010 by GTR-32U

[Guilt-Toy]

actually its just the dirt and dust on the roads, especially when it rains and the position i had the filter would not have been helping (in the front gaurd)

This country is actually pretty clean, not much smog and polution etc etc. its just the dirt and dust on the roads and everywhere that kills it...