TurboB18C1

Boost controler = blitz dual sbc (gain 20, setting at 55)
Greddy Kit - tdo5-18g
problem:
When im pushing out 15 lbs of boost it holds up to the point after 5600 rpms and then drops to 11 psi at redline, i dont know that is going on. There are no vacum leaks or nothing like that??
If it is the wate gate what can i do to fix it, it is internal

bryan305

IIRC, the 18g is the big upgrade for eclipses pushing ~30 psi so it should be big enough for your app. Umm Could your BOV be leaking under high boost?

TurboB18C1

how would i check the bov, should i tightn the spring all the way and see if it still leakes? also greddy told me that i can push this turbo no more than 25 psi

bryan305

25 psi sounds about right since it's around the same cfm as a 2.0l eclipse at ~30psi

What kind of BOV is it? You can just look up specs to see if it's designed for boost at that level.

TurboB18C1

HKS SSQ the one that whistles or makes that high pitched nosie + it does not make that sound anymore since i out my hondata in??

GreddySi99

Remember a GSR engine flows alot better than a DSM ever thought of flowing. I would say that that turbo should maintain a constant 15psi but above that it might become inefficient. but it sounds like you have other problems. check the BOV as stated above and then check to see if there are any clamps that are loose on the intercooler piping.

VTC_CiViC

This is the inherit problem with GReddy kits.. ALL GReddy kits. You're not the only one whose had problems with the internal WG fluctuating boost. IMO the spring is just too soft for anything over 9-10psi reliably, and people have had motors let go on boost creep from that very problem, so beware

Andrew 825SM

I too have the same problem. It would hold 13 psi, then drop down to 10.5 psi from 6000 rpm +. So when you dyno your car, you will get lower numbers since you are basicaly runnning 10.5 psi with a 13 psi spike.

stackz

make a block-off plate for the blow-off valve and run once or twice with the plate on instead of the blow-off valve to see if you hold boost...if you don't then it's not the bov.

only other things it could be are a loose pipe coupler somewhere or the wastegate.

best thing I've found to test couplers is to get some thick dishwashing liquid and coat them all with it heavily, then tape off all grille openings and make a 1st gear run hard as you can stopping after first gear. cut the car and check them all out for bubbling/parting of the detergant as that will signal that air was coming out in that area...then just hose them off

if not then I suggest buying a better wastegate or try adapting a wastegate from a TE04H (chrysler cars) as they are able to hold up to 22psi stock and are all OVER the junkyards.

bigwig

im planning on getting a greddy turbo kit but i only plan on running 8 psi daily and maybe like 10 psi if i wanna do some runs. will i find a spike with that? if so im def not buying the g18 and ill just buy a t3/t4

TurboB18C1

thanks for your help and i will try these things to see what is making my turbo lose boost from 15psi Thanks

danl

Trust me, it sounds like a boost leak. I've been their.

TurboB18C1

When i made test runs on 10 psi, my hondaloger showed that it held boost to all the way to redline and when i turned the boost higher to 16 psi it had that boost lost again and droped to 11 psi so im asuming that its my waste gate opening up because if it was a boost leak some where else shouldnt it leak at 10psi?

there is a nut on my internal wastegate, should i try to tightn it so that the spring gets stiffer or should i leave it alone and swap out the wastegate and go find a new one?!

Andrew 825SM

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboB18C1 &raquo;</TD></TR><TR><TD CLASS="quote">When i made test runs on 10 psi, my hondaloger showed that it held boost to all the way to redline and when i turned the boost higher to 16 psi it had that boost lost again and droped to 11 psi so im asuming that its my waste gate opening up because if it was a boost leak some where else shouldnt it leak at 10psi?

there is a nut on my internal wastegate, should i try to tightn it so that the spring gets stiffer or should i leave it alone and swap out the wastegate and go find a new one?! </TD></TR></TABLE>

I have the exact same problem you are stating. I remember BoostKillz running 15 psi with a Greddy profec B and it held steady boost at that level.

TurboB18C1

so you are saying that if i change my boost controler that it might fix my problem?
should i invest in another boost controler ? dont all of them opperate in the same manor?
The one i have is the Blitz daul sbc spec s (SS) not (DS)