So, just as the title says, i just finished instaling a GT2854R (Info about turbo here: http://www.turbobygarrett.com/...9.htm) on my DOHC ZC. The car was not boosting at all with the wastegate atached, i would get about 1 psi all the way to the redline, so i went and gave it a shot to see if the wastegate was really closed. I tied it shut with metal wire. Now, i was guessing i would get about 15 psi in 2nd gear in no time, so i went at it real slow, just to see if it was boosting.

Heres the deal:
from 1000 to 4000 I get 1 psi
from 4000 to 5500 I get 5 psi
and from 5500 to 7200 it jumps quickly to 7 psi and there on creeps slowly to 9 psi.

THe wastegate is COMPLETELY shut, i tied it down very well.

So, am i just using the wrong turbo or do you think there might me something inside the turbo thats not letting it spool how it should.

 

Check your IC piping, that would be my guess, something isnt tight. if not i have no idea, good luck man

 

I thought of that, but there is no damage to the piping and i've checked all the couplers a million times...

 

Engine is stock internally, well, it has a HKS 0.7mm Headgasket with about 10:1 compression and ARP head studs. DOHZ ZC's come stock on Si Sedan Civics here in venezuela, im runing a P29 computer (also came stock.) on the blue box temporally, crome is going to replace that in a couple of weeks.

I had a diferent turbo before (TD04) but i has a pretty different setup(that one held boost under the same engine specs), the things that have changed include manifold, part of the charge piping, BOV and DP.

 

If you turned up the boost to 15-20 psi the turbo will come alive

 

How am i going to turn up the boost if the wastegate is just held ****. I doesnt ever open at all

 

If the wastegate is held shut, wouldn't your turbo be taking the max amount of boost (ie. overspooling)?

DAN

 

lol ya someone needs to research some more on wastegates . What spring do you have? and have you checked the diaghram for any rips? What intercooler are you running? and what manifold?


Modified by 95GSRTT at 5:51 PM 10/5/2005

 

Thats the deal, if there are no leaks, because i confirmed this and the wastegate is shut then why the f*ck doesnt boost start to go up like crazy.

This is the only GT28 that is internally wastegated, but when i said i tied it down i mean I held it with a piece of metal. BElive me it doesnt move at all.

Civic HF manifold and Modified DSM 1g intercooler

 

You have a leak somewhere. They can be a bitch to find sometimes. Once I had a rip up the side of the coupler that connected my charge pipe to my throttle body. The rip wasn't visible by visual inspection, only by bending the coupler did I see it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PK SPEED &raquo;</TD></TR><TR><TD CLASS="quote">If you turned up the boost to 15-20 psi the turbo will come alive</TD></TR></TABLE>

Why would you say that???

This turbo's 'range' is commonly known to hae a roof of around 250/260 hp....

At 15 psi, this thing would probably be off the compressor map

 

is the car tuned?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Blindstuff &raquo;</TD></TR><TR><TD CLASS="quote">Now, i was guessing i would get about 15 psi in 2nd gear in no time, so i went at it real slow, just to see if it was boosting.

Heres the deal:
from 1000 to 4000 I get 1 psi
from 4000 to 5500 I get 5 psi
and from 5500 to 7200 it jumps quickly to 7 psi and there on creeps slowly to 9 psi.

THe wastegate is COMPLETELY shut, i tied it down very well.

So, am i just using the wrong turbo or do you think there might me something inside the turbo thats not letting it spool how it should.</TD></TR></TABLE>

You're not giving it much gas and looking for boost? If you don't give it a lot of throttle you won't build boost as much or at all.

Sounds like something is wrong with your wastegate perhaps?

 

Might have leaks in the charge piping/intercooler, exhaust system could be severely plugged up somewhere. Maybe try pulling off the downpipe and run it completely open. You should be building a lot more boost a lot faster. Also check if the turbo intake isn't blocked off too much, i heard of guys putting a rag around it to make a ghetto air filter and the car wouldn't boost much at all because of intake air restriction. Hope this helps

 

check for leaks between the head and the turbo.

 

Im going to check everything you said. Seems i´l have to pull the turbo kit apart.

The car is not tuned yet, im runing blue box as a temp

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beepy &raquo;</TD></TR><TR><TD CLASS="quote">You have a leak somewhere. They can be a bitch to find sometimes. Once I had a rip up the side of the coupler that connected my charge pipe to my throttle body. The rip wasn't visible by visual inspection, only by bending the coupler did I see it.</TD></TR></TABLE>

Might just change ALL the couplers

thanx for the help