I was driving home from school the other day and I just put in a B18B for boosting purposes. I have broke it in and it now has 1000 miles on it. I decided to open her up once and like something broke. Whenever I floor it and its at wide open throttle the car makes like a fluttering noise. I though maybe that i blew a weld on the exhaust, cuz that is the sound it makes. I checked and found nothing visibly wrong. Please give me suggestions to what i did.

 

I would do a leakdown test

 

what i meant by fluttering is, when i floor it the car kind shakes and it sounds like it is farting, i guess that is the best way i can put it. Like imagine a go carts loud putting noise it makes, putt putt putt putt

 

You're leaning out.

edit: You probably fucked something up.. burnt a valve.. you did something bad.

 

if i burnt a valve wouldnt I be able to feel it more often then just when I floor it?

 

Do you have a vacuum or boost gauge? If you have a fucked valve your vacuum levels will flutter with an idle that doesn't flutter so much.

 

Chris, if you still want to ditch being mod I'm down.

 

thanks for the help guys, but I just fueled up with a higher octane and the noises went away.

 

What?

You were detonating? It sounded like pinging? Or flutter?

Check your plugs ---- head.