Boost question
Thread Starter
Pro
Joined: Aug 2001
Posts: 724
Likes: 0
From: West Palm Beach FL
Boost question
I cannot make over 8lbs of boost on my 427TT. I am running the EBoost2...in the instructions there are two ways to plumb the Solinoids to open the waste gates...I switched to method 2 which is "how to make max boost". I am running the 7lb WG spring. Should I change this ?
Not sure if exhaust manifold back pressure is opening the wastegate?
If I want to make 20lbs (approx 20 lb spring).....what will happen when I only want 7lbs on the street?
Some knowledge of Eboost 2 is needed to understand what I am asking and how the system is supposed to work.
Hose ...Forced induction ...you there????..Anyone else
Thanks Tom
Not sure if exhaust manifold back pressure is opening the wastegate?
If I want to make 20lbs (approx 20 lb spring).....what will happen when I only want 7lbs on the street?
Some knowledge of Eboost 2 is needed to understand what I am asking and how the system is supposed to work.
Hose ...Forced induction ...you there????..Anyone else
Thanks Tom
Melting Slicks
Joined: Mar 2003
Posts: 3,116
Likes: 10
From: Macomb MI
General rule of thumb is you should be able to make atleast 2x the base spring pressure with a boost controler. Most setups will make more.
Check your Blowoff valves and the plumbing to them, they may be blowing open. Also check for the usual hose couplers off.
Phil
Check your Blowoff valves and the plumbing to them, they may be blowing open. Also check for the usual hose couplers off.
Phil
Le Mans Master
Joined: Sep 2000
Posts: 6,976
Likes: 527
From: Clouds Over California
As Phil stated you should be able to at least make double what the springs are set at. Using my manual boost controller with 8.75lb springs I made 18 #s.
Have you tried running your setup with no Boost Controller just to make sure everything is working correctly first?????
Have you tried running your setup with no Boost Controller just to make sure everything is working correctly first?????
Le Mans Master
Joined: Oct 2003
Posts: 8,862
Likes: 85
From: PA
St. Jude Donor '08
tom sounds to me that there might be some sort of plumbing isssue.
double check everything as far as v. lines.
the lines comin off the niods should be going to the top of the gates.
double check everything as far as v. lines.
the lines comin off the niods should be going to the top of the gates.
Melting Slicks
Joined: May 2002
Posts: 3,210
Likes: 1
can you give us a detailed description of how you have the signal lines hooked up to the WG & BC? there are several different ways to do this depending on your hardware and your goals each one has a benifit and drawback.
Not to go against what others have said above but you generally shouldn't try to run more then double the spring pressure using a boost controller. if you have a 5# spring and are trying to run 10# of boost using either an EBC or MBC what happens is that 5# spring will start to crack open prematurley somewhere between 5-10psi from exhaust pressure. this will cause you to lose power during spoolup. EBC's combat this effect somewhat by actually holding the signal line going to the WG closed using a solenoid. once your desired boost pressure is reached the solenoid will open sending a boost reference to the WG which allows the WG to open.
so basically the closer your static pressure is, which is just the spring pressure in the WG, to the actual boost you intend to run the better your boost response will be.
Hope that all makes sense...
Not to go against what others have said above but you generally shouldn't try to run more then double the spring pressure using a boost controller. if you have a 5# spring and are trying to run 10# of boost using either an EBC or MBC what happens is that 5# spring will start to crack open prematurley somewhere between 5-10psi from exhaust pressure. this will cause you to lose power during spoolup. EBC's combat this effect somewhat by actually holding the signal line going to the WG closed using a solenoid. once your desired boost pressure is reached the solenoid will open sending a boost reference to the WG which allows the WG to open.
so basically the closer your static pressure is, which is just the spring pressure in the WG, to the actual boost you intend to run the better your boost response will be.
Hope that all makes sense...
Le Mans Master
Joined: Oct 2003
Posts: 8,862
Likes: 85
From: PA
St. Jude Donor '08
[QUOTE=AlwaysInBoost;1559079613]can you give us a detailed description of how you have the signal lines hooked up to the WG & BC? there are several different ways to do this depending on your hardware and your goals each one has a benifit and drawback.
Not to go against what others have said above but you generally shouldn't try to run more then double the spring pressure using a boost controller. if you have a 5# spring and are trying to run 10# of boost using either an EBC or MBC what happens is that 5# spring will start to crack open prematurley somewhere between 5-10psi from exhaust pressure. this will cause you to lose power during spoolup. EBC's combat this effect somewhat by actually holding the signal line going to the WG closed using a solenoid. once your desired boost pressure is reached the solenoid will open sending a boost reference to the WG which allows the WG to open.
correct....that is what roadrebel said.... up to double
Not to go against what others have said above but you generally shouldn't try to run more then double the spring pressure using a boost controller. if you have a 5# spring and are trying to run 10# of boost using either an EBC or MBC what happens is that 5# spring will start to crack open prematurley somewhere between 5-10psi from exhaust pressure. this will cause you to lose power during spoolup. EBC's combat this effect somewhat by actually holding the signal line going to the WG closed using a solenoid. once your desired boost pressure is reached the solenoid will open sending a boost reference to the WG which allows the WG to open.
correct....that is what roadrebel said.... up to double
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Melting Slicks
Joined: May 2002
Posts: 3,210
Likes: 1
Originally Posted by NICK YOSKIN
correct....that is what roadrebel said.... up to double
my experience has shown that trying to run too much boost on a small spring will lead to inconsistant boost pressures.
Le Mans Master
Joined: Oct 2003
Posts: 8,862
Likes: 85
From: PA
St. Jude Donor '08
Melting Slicks
Joined: May 2002
Posts: 3,210
Likes: 1
I have a couple Tial springs sitting around if you want to give it a shot.
Le Mans Master
Joined: Oct 2003
Posts: 8,862
Likes: 85
From: PA
St. Jude Donor '08
but doenst the ebc hold "them" shut? isnt that one of the benifts of ebc ....gain?
Thread Starter
Pro
Joined: Aug 2001
Posts: 724
Likes: 0
From: West Palm Beach FL
The EBoost2 "two port" method...used to achieve the Max possible boost pressure that the system will develop.
Connections are:
1. Boost pressure source (turbo outlet) to solenoid port 2
2. Bottom port of WG connected to port 3 of solenoid
3. Top port of WG connected to port 1 of solenoid
Rechecked all connections....no leaks, all okay.
Could it be that there is too much manifold backpressure....forcing the wastegate open......I have a 427 running the PTK kit designed for stock CI motor...
Let me know what you think
Tom
Connections are:
1. Boost pressure source (turbo outlet) to solenoid port 2
2. Bottom port of WG connected to port 3 of solenoid
3. Top port of WG connected to port 1 of solenoid
Rechecked all connections....no leaks, all okay.
Could it be that there is too much manifold backpressure....forcing the wastegate open......I have a 427 running the PTK kit designed for stock CI motor...
Let me know what you think
Tom
Melting Slicks
Joined: Mar 2003
Posts: 3,116
Likes: 10
From: Macomb MI
The EBoost2 "two port" method...used to achieve the Max possible boost pressure that the system will develop.
Connections are:
1. Boost pressure source (turbo outlet) to solenoid port 2
2. Bottom port of WG connected to port 3 of solenoid
3. Top port of WG connected to port 1 of solenoid
Rechecked all connections....no leaks, all okay.
Could it be that there is too much manifold backpressure....forcing the wastegate open......I have a 427 running the PTK kit designed for stock CI motor...
Let me know what you think
Tom
Connections are:
1. Boost pressure source (turbo outlet) to solenoid port 2
2. Bottom port of WG connected to port 3 of solenoid
3. Top port of WG connected to port 1 of solenoid
Rechecked all connections....no leaks, all okay.
Could it be that there is too much manifold backpressure....forcing the wastegate open......I have a 427 running the PTK kit designed for stock CI motor...
Let me know what you think
Tom
This is what I suggest you do, VERY CAREFULLY!!!!
Unhook all vac lines from the gates, and go test your boost level again. It should spike in boost and It will do it pretty quick, this will help pinpoint which side of the system the problem is.
1. If it does spike then its in the Eboost or the eboost setup but this will tell us for sure.
2. If it still does not go over 8psi then we have to look elsewhere.
Phil
PS I have $5 on #1
Last edited by RoadRebel; Feb 23, 2007 at 09:26 AM.