So after i fixed my problem, i couldn't boost past 6 psi hence my 1/4 times, now my car spikes like crazy. Few mins. ago i hit 20.7 psi. I am using the Greddy boost controller. Gain was on 0% and the boost start was at 5.5 lbs. Limiter at 10 psi and limiter % was at like 50%.

I checked over my vaccum hoses and they are connected right. So here's where i think it might be the problem:

1) Vaccum hoses are too long

2) Since i had exams and crap, i haven't had time to fix my hoses. Like th eone from the wg to the bov are 2 different size hoses b/c my bov needs a smaller hose than the wg.

3)Thanks to my ridicolously designed manifold, (old lovefab shorty), i had to refabericate all my pipes. So part of the downpipe was redone using crush pipes from the elbow to the dp till i have money to buy a new one. Could that be using pressure build up and causes the air to go back to the turbine and causing the boost spike?

TIA

 

What kind of wastegate? What size downpipe, and is it connected to an exhaust?

Pics may help a lil also.

 

Wastegate is Tial 38mm. HKS ssq bov, 2.5" dp. Turbo is connected to elbow, to dp, to 2.5"-3" reducer to 3" flex pipe to 3" thermal exhaust.

Lovefab shorty manifold, Precision 880cc injectors

 

yikes 20.7 psi is scary

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">yikes 20.7 psi is scary </TD></TR></TABLE>

yah tell me about it man.

 

what psi spring do you have in your tial wastegate?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by oxSLEEPERxo &raquo;</TD></TR><TR><TD CLASS="quote">what psi spring do you have in your tial wastegate?</TD></TR></TABLE>

I was told it's a .6 bar so about 8.7 psi.

 

First thing I would do is remove the boost controller from the equation. See if the wastegate is controlling boost correctly on its own.

 

open the wg and check the color of the spring to make sure it is a .6 bar i think it should be red it might be wrong.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JdmEKCivic &raquo;</TD></TR><TR><TD CLASS="quote">open the wg and check the color of the spring to make sure it is a .6 bar i think it should be red it might be wrong.</TD></TR></TABLE>

But in theory, i should be boost spiking if it's over .6 bar spring, right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by t04ecvc &raquo;</TD></TR><TR><TD CLASS="quote">First thing I would do is remove the boost controller from the equation. See if the wastegate is controlling boost correctly on its own.</TD></TR></TABLE>

I turned off the boost controller and gave it a run and it still spikied. so i know the boost controller isn't the problem.

 

Would the fact that he has the stock MAP sensor have anything to do with it?

 

Try taking a small piece of hose that you KNOW has no cracks, holes etc. and run it directly from the bottom port of the W/G to the nipple on the turbo, and give it a test run. and leave the top port of the W/G open

if it doesn't spike then you know its from the boost controler down.

if you find out its the boost controler or the install of the lines, inspect the lines and try hooking it up using the internal wastgate diagram, run the line to the bottom port of the wastegate, and leave the top port open

My Spec II holds rock solid in this configuration

 

its probably your vacuum line routing to the wrong thing on the wastegate
send me a pic of your engine...

 

ok man, this is really pissing me off. It just spiked 14-16 again. I'm still working on the pics. i'll have me asap.

But I dont know what to do anymore. I checked my hoses and replaced most of them.

 

Well why the **** are you beating on your car when you know you have spike problems

Doesnt take a week to take pictures

Seriously, if you knw you have a problem, boosting 20+ psi on Im assuming stock block b series, your pissing your engine away

 

hello, i'm adjusting my boost controller settings and testing them...i'm doing boosting unless i'm testing!!!!

And yes, it's a stock B18c1. After fixing few vacuum hoses. I got it to only spike to about 16 psi. No more 19 and 20 BS but problem still not solved.

I don't have a camera. Trying to borrow one from my friends.

 

Try opening your Wastegate and see if the DIAPHRAM is Broken of some sort. If it is, this will let boost SPIKE real HIGH.... Best bet, if all things are eliminated.

 

I had a 38mm tial that was forever spiking. Changed to a 44mm tial and what da ya know...no more spiking.
However, your setup is probably a bit different than mine. Check over the lines and make sure everything is routed correctly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boosted2K &raquo;</TD></TR><TR><TD CLASS="quote">Try taking a small piece of hose that you KNOW has no cracks, holes etc. and run it directly from the bottom port of the W/G to the nipple on the turbo, and give it a test run. and leave the top port of the W/G open

if it doesn't spike then you know its from the boost controler down.

if you find out its the boost controler or the install of the lines, inspect the lines and try hooking it up using the internal wastgate diagram, run the line to the bottom port of the wastegate, and leave the top port open

My Spec II holds rock solid in this configuration </TD></TR></TABLE>

This is the best advice I have seen so far Pete. I think we should try this and see how it goes.

Boposted2K; is your top port open at all times? His goes to the boost controller solenoid. Is that not necesary?

 

Yes, my top port is open at all times, I run the Profec-B spec II in the internal wastegate configuration (shown in the instructions). The line is run to the bottom port of the Tial W/G.

This method of hook-up was recomended to me by Jason H (Stoopid) during my tuning session, I have been told this is wrong, but it holds boost for me ROCK SOLID, I hear alot of complaints about the spec II, I'd say they are probably 99% user error. This boost controller works fine if you learn how to use it, no need for the over-rated AVCR.

 

will try that and keep u updated.

 

I wonder if since Greddy screwed up some terms in the directions, if maybe they screwd up the install diagrams???

 

turn your gain down (mine is at 0%). hook your **** up right.

 

My gain is at zero percent and my **** is hooked up right according to the Greddy diagrams.


Modified by RNPoo7 at 12:05 AM 12/26/2004