rallyred1234

I have a 2003 evo VIII with almost 24,000 miles on it. the car pulls perfect all the way tell a 100 mph. Then about a 105-110ish it makes this bad sound and the car doesn't go much faster. Im affraid to go any faster because the sound kinda sounds like air fluttering but going really slow. kind of like an air compressor adjusting air susspension. but its coming from the left driver side of the engine bay. So if anyone knows what this problem could be i would appreciate it!

IXmr321

iTrader: (3)

What BOV do you have?

rallyred1234

stock, the engine only has intake and turbo back, its pretty much a show car but i have parts and tune on the way.

vwjeff

iTrader: (13)

You should not drive 100mph

rallyred1234

f dat haha its an evo. i didnt buy a truck or a slow car for a reason

IXmr321

iTrader: (3)

is it a fluttering sound? Do you have aa boost gauge...if so, whats the boost doing at this speed?

rallyred1234

it says im still pushing 21~22psi

quick silver 8

iTrader: (3)

sounds like the blow off valve is releasing air

m4tt VIII

iTrader: (32)

blow off valve, switch to jdm ix mr bov i switched and it was the best thing ever

ONRAILS

iTrader: (7)

something loose rattling.

recompile

iTrader: (38)

+1, your plastic BOV is probably fluttering

90AWDSM

Do you still have the Stock AirScoop under the hood? If so, Check to see that the 2 push screws are still on it keeping it held down. Mine came off (or somebody took them off) and everytime i would get up to speed and in boost, it would suck up to the top of the hood causing it to bog and not gain anyspeed.

Maybe this isnt your case but it can be a possibility.

IXmr321

iTrader: (3)

Thats what I was sorta leaning towards....lol

ONRAILS

iTrader: (7)

I just reread this..

Downshift dude... to 4th. Rev it out. Its compressor surge of that VIII turbo

urnamehere

iTrader: (12)

try the metal mr bov!