Ok attempt number 2 at this, hopefully the new title helped everyone get over their fear of giving their opinion.

My setup holds 10psi on an 8psi (7.5 techincally but you get the idea) spring when I recently changed to full 3" exhaust. I think the wastegate can keep up with my setup, but these other problems may be causeing it but I wanted some second (and third) opinions. It was open dp before so it would creep alot before the exhaust, now not so bad but still not perfect.

1.Wastegate flange is slightly warped... seeing some carbon tracking on one edge were is definately has a very small leak. <U>Should I let carbon seal it or can someone link me to a gasket that will not blow out like the ones tial supplys?</U>

2.Bov sticks a tad lately and the internal valve wont seat all the way down, even at idle it leaks a little through the small port (blitz DD). Yes it stil has the soft spring but I cranked down the tension on it (they only rate the soft to like 14 psi, although not sure what turbo size that references to). <U>Should I change the spring and has any others had similar experience with this blitz (how did you fix it)?</U>

3.Wastegate pressure signal comes from right after the leaking blow off valve. <U>Should I change this and if so were would I want to tap it?</U>



Modified by twkdCD595 at 10:55 AM 2/2/2006

 

What kind of manifold are you using? Some manifolds tend to cause boost creep more than others..

 

Custom tubular ss unequal length shorty... wastegate placed right by what I guess you would call the collector (which is pretty short cause of the space I had to work with). Tial gate is at like a 75 degree angle to the runners... so not like some of the manifolds that creep cause the gases make like 90 degree or more turn to exit the gate.

Thanks for taking the time to read this... appreciate any help.

edit: Also if it helps, I had no creep or spiking on the 2.5" exhaust I ran before the period of time I ran open dp. I run a t3/t4 60-1. If I turn up the boost (yes tuned) it acts like I develop a bad vaccum leak, boost starts to creep pretty badly... I am thinking it is pushing the bov open and then bam spike foo.


Modified by twkdCD595 at 11:06 AM 2/2/2006

 

1. check out http://www.atpturbo.com they have the steel-ring wastegate gaskets that work very well

2. dunno, sorry

3. I would try a different boost reference source for the wastegate - try pulling the signal directly from the turbo compressor and see if there's any change.

is your wastegate routed into your exhaust or open dump?

 

Wastegate dumps to the atmosphere.

Compressor has no provisions for tapping as a pressure source reference... could I just tap to the charge piping right after it?

Thanks for the link... checking it out... appreciate your time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">Compressor has no provisions for tapping as a pressure source reference... could I just tap to the charge piping right after it?
</TD></TR></TABLE>

You should be able to.. I've had mine setup that way for a while now. The only bad thing is that the intercooler usually causes some pressure drop, so you probably won't boost as high as your spring is rated for (I guess that could work out good in your case though).

 

yep you could tap the charge pipe or you could even tap the compressor housing yourself - 1/8" NPT and stick a fitting in it.

hell, just move the vacuum line off of the BOV line to another vac. line from the IM to see if it makes any different.

if there's any capped vac. ports on your intake mani you could re-route to one of those.

 

Hmmm... all good suggestions. will update after I give these things a try.

Unfortunately getting the turbo off is a major pita on my setup but then agian I am going to have to take it and the manifold off anyways to get to the wastegate.

THANK YOU guys very much!!! It is much appreciated.

Anyone else with opinions or suggestions feel free to add/ reiterate ANYTHING. Still wonder what the deal is with this spring in the bov??? Thinking I might just get the hard spring just in case this does not work. I just am very tight on funds with some unexpected bills (like everyone it seems).

edit: Just thought I would add the correction... they say the spring in the bov is rated to 18 psi (agian I have no clue on what turbo this references which would be very important), not 14 like I thought.


Modified by twkdCD595 at 1:20 PM 2/2/2006

 

sorry to thread jack but i had a boost creep question, and i didnt want to start a new topic...

i have some boost creep problems (6psi spring usually ends up at 10psi or so at highter rpms) and i figured it was probably becasue of my manifold (ssautoshit)... however, i have my dump tube routed into my 3" dp fairly close to the turbo EX housing could this cause some extra creep? will running my e-cutout open increase the tendency to creep or help it? thanks!

 

open cutout should cause more creep from what I know (it would be like running an open dp)... as to were the added backpressure of it closed and running through full exhaust should help it to not (since the gases are not exiting so fast that they cannot be redirected).

agian this is from what little I know.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">open cutout should cause more creep from what I know (it would be like running an open dp)... as to were the added backpressure of it closed and running through full exhaust should help it to not (since the gases are not exiting so fast that they cannot be redirected).

agian this is from what little I know.</TD></TR></TABLE>

kool man.. thats what i thought as far as the cutout went... thanks....

anyone have any feedback on my wastegate problem...?