darksol2005

well i've had this nasty turbo lag problem for awhile, and i've been slowly trying to figure it out. couldn't get a .42 .48 to spool until 4500 rpm's, same w/ the .60 .48. what i've tried- found one leak in the charge pipe, cooler doesn't leak, bov doesn't leak, and the couplers are good, and mani/turbo flange doesn't leak. what i'm trying- new injector seals, covering up the hole for the internal wastegate or putting a gasket on it. anyone know where to find a gasket for this can't seem to dig one up. any more suggestions as to where i should be looking?

FooK

check raceeng.com for gaskets.

darksol2005

checked before. couldn't find ----

FooK

make sure im understanding this right, you're running an external wastegate setup on a turbo that was originally internal, and you think the original wg hole is leaking, right?

can you take a pic of how its set up now? usually the downpipe flange you end up using just blocks that hole off.

darksol2005

correct. but there's an exhaust leak that's coming from there. a small one, but it's there

FooK

if you have no luck finding a gasket, i suggest finding a home depot or somewhere that can supply some really thin sheet metal (im talking like paper thin), cut yourself a gasket outta that. maybe do two of them, so they can squish together.

however, if its not sealing, and this is a homemadedownpipe, it may have warped the flange slightly during weld (mine did). I had a flat plane sander at work handy so i just milled it down flat again. you might need to do that.

darksol2005

thanks fookie. i'll give er a try

FooK

test it for warp first.

put a flat edge across the flange, then use feeler gauges to check for gap on the outisde edges or in the center. depending on which way it bowed when it warped.

lkailburn

a leaky downpipe flange will cause a slower spool?