need help overboosting problem - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
TurboDodge.com MarketPlace Shelby Registry Contact Us

Advertisement - Remove these ads today by clicking here.
Go Back   Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more! > Turbo Dodge Technical Chat > Turbo Dodge Help


Turbo Dodge Help Urgent help when something goes wrong with your Dodge and you can't figure out what the problem is. Troubleshooting help and the place to post when you're stuck with a broken car and have to get to work the next day.

Reply
 
LinkBack Thread Tools
Old 01-19-2013, 01:53 PM   #1
need help overboosting problem  
TD New Guy
 
Join Date: Nov 2011
Location: Holland Mi

My Ride: 1990 Shelby Daytona
Engine: 2.5l t1
1/4: 0.000

Posts: 58
Feedback: (0)
danbosman is keeping the peace
hi i have a 1990 shelby tona and i cannot seem to figure out why my boost keeps going past 15psi on the gauge i even tried putting a manual boost valve in and it still does it. if i close the valve all the way it only boosts up to 5psi. when its slightly open it overboosts then starts going down im stuck and cant think of anything else.
if someone could chime in with some help that would be great
thanks
danbosman is offline  
Reply With Quote Quick reply to this message Share on facebook
Sponsored Links
Advertisement
 
Old 01-19-2013, 05:04 PM   #2
Re: need help overboosting problem  
TD Extreme User!
 
Join Date: Apr 2004
Location: Mesa, AZ.

1/4: 0.000

Posts: 11,545
Feedback: (59)
tryingbe is keeping our cars running
New to you car?
When did the problem surface?
tryingbe is offline  
Reply With Quote Quick reply to this message
Old 01-19-2013, 06:48 PM   #3
Re: need help overboosting problem  
TD New Guy
 
Join Date: Nov 2011
Location: Holland Mi

My Ride: 1990 Shelby Daytona
Engine: 2.5l t1
1/4: 0.000

Posts: 58
Feedback: (0)
danbosman is keeping the peace
Well I changed the engine and transmission and took the whole vacuum system out as one piece and I made a video of how everything went back together and any way I have my manual boost control valve hooked up and I know its right cause I hooked it up on my buddies car the same way and it worked fine. Could it b my waste gate can?i know the rod is still on the swing valve.
danbosman is offline  
Reply With Quote Quick reply to this message
Old 01-19-2013, 08:44 PM   #4
Re: need help overboosting problem  
TD New Guy
 
Join Date: Nov 2011
Location: Holland Mi

My Ride: 1990 Shelby Daytona
Engine: 2.5l t1
1/4: 0.000

Posts: 58
Feedback: (0)
danbosman is keeping the peace
I am new to turbos
danbosman is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 12:09 AM   #5
Re: need help overboosting problem  
Garrett Booster
 
Join Date: Nov 2012
Location: sturgis mi

My Ride: 1996 Dodge 2500 CTD
Engine: 5.9 Cummins
Induct: Turbo
1/4: 0.000

Posts: 158
Feedback: (0)
sinfulrelations is keeping the peace
what type of mbc are you using??
sinfulrelations is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 06:37 AM   #6
Re: need help overboosting problem  
NAJ
Just A Guy


 
NAJ's Avatar
 
Join Date: Mar 2007
Location: New Jersey

My Ride: 1990 Daytona Shelby
Engine: 2.2 L VNT
Induct: Turbo
1/4: 15.570

Posts: 19,722
Feedback: (24)
NAJ has really helped outNAJ has really helped out
I will get you 2.5L T-1 Diagnostics by tomorrow morning.
NAJ is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 07:52 AM   #7
Re: need help overboosting problem  
TD Extreme User!
 
Join Date: Apr 2004
Location: Mesa, AZ.

1/4: 0.000

Posts: 11,545
Feedback: (59)
tryingbe is keeping our cars running
Quote:
Originally Posted by danbosman View Post
if i close the valve all the way it only boosts up to 5psi. when its slightly open it overboosts then starts going down

If the vacuum lines to the MBC is reversed, it will do that.
tryingbe is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 07:58 AM   #8
Re: need help overboosting problem  
NAJ
Just A Guy


 
NAJ's Avatar
 
Join Date: Mar 2007
Location: New Jersey

My Ride: 1990 Daytona Shelby
Engine: 2.2 L VNT
Induct: Turbo
1/4: 15.570

Posts: 19,722
Feedback: (24)
NAJ has really helped outNAJ has really helped out
I am also assuming this is a stock setup with the stock exhaust.
On the 2.5L T-1 and the 2.2L T-4 VNT the exhaust was engineered to be part of the boost control system.
If you lower exhaust backpressure the Mitsu turbo will overspool.
NAJ is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 08:17 AM   #9
Re: need help overboosting problem  
NAJ
Just A Guy


 
NAJ's Avatar
 
Join Date: Mar 2007
Location: New Jersey

My Ride: 1990 Daytona Shelby
Engine: 2.2 L VNT
Induct: Turbo
1/4: 15.570

Posts: 19,722
Feedback: (24)
NAJ has really helped outNAJ has really helped out
OK..Had time today before I had to leave ...
















PRESSURE TESTER
http://www.tooltopia.com/mityvac-mv8500.aspx
NAJ is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 09:18 AM   #10
Re: need help overboosting problem  
TD New Guy
 
Join Date: Nov 2011
Location: Holland Mi

My Ride: 1990 Shelby Daytona
Engine: 2.5l t1
1/4: 0.000

Posts: 58
Feedback: (0)
danbosman is keeping the peace
Its a cheaper one it was like 30 bucks. Its call boost controller high performance. And yea I've heard of the back pressure thing withe Mitsubishi Turbo but I had the same set up on my old engine and it worked fine. The only difference in the exhaust is that there is a test pipe in place of the cat but it was also like that on the other engine. Thank you for the images. Oh and one more difference I swaped it to a manual trans as well
danbosman is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 09:22 AM   #11
Re: need help overboosting problem  
Level 4 Supporter
 
Join Date: Apr 2004
Location: Pittsburg, PA

My Ride: 86 ghlt
Engine: 2.5 Intercooled Turbo
Induct: Turbo
1/4: 0.000

Posts: 862
Feedback: (3)
paulharbosky is ready to make a name for oneself
wastegate flapper door may be stuck. easy way to see if WG is the prob. hook up straight vacuum to WG nipple(no check valve no orifice)make sure ur getting vacuum. when boost pressure builds in vac line it should open the swingvalve and youll get 5-7 lbs of boost. if it still overboosts take off WG can ad try to move the swingvalve. it may be seized. if it moves change wg can and perform same test. when you get 5-7 lbs doing this look to you boost control setup. try simple maual setup(use restrictor ..... makes it much more responsive)
paulharbosky is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 11:15 AM   #12
Re: need help overboosting problem  
TD New Guy
 
Join Date: Nov 2011
Location: Holland Mi

My Ride: 1990 Shelby Daytona
Engine: 2.5l t1
1/4: 0.000

Posts: 58
Feedback: (0)
danbosman is keeping the peace
I know the swing valve is moving because I moved it with the actuator rod off
danbosman is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 11:37 AM   #13
Re: need help overboosting problem  
Level 4 Supporter
 
Join Date: Apr 2004
Location: Pittsburg, PA

My Ride: 86 ghlt
Engine: 2.5 Intercooled Turbo
Induct: Turbo
1/4: 0.000

Posts: 862
Feedback: (3)
paulharbosky is ready to make a name for oneself
Quote:
Originally Posted by danbosman View Post
Its a cheaper one it was like 30 bucks. Its call boost controller high performance. And yea I've heard of the back pressure thing withe Mitsubishi Turbo but I had the same set up on my old engine and it worked fine. The only difference in the exhaust is that there is a test pipe in place of the cat but it was also like that on the other engine. Thank you for the images. Oh and one more difference I swaped it to a manual trans as well
I bought one of these (high performance boost controller)on ebay a while ago. bottom line....junk. it will absolutely not work the way they show it hooked up in the instructions. my advice throw it away. use the stock boost controoler till u can get a better one. if you want to try to make it work you have to hook it up like this:
Simple bleed systemneed help overboosting problem-tboost_2.jpg

Doesn't get much simpler then this- The restrictor keeps you from having to have a MASSIVE bleed to open the wastegate enough and the check valve keeps you from having a vacuum leak when not under boost.

Problem- Boost goal may or may not creep past set point and spiking maybe and issue. Very sensitive to restrictor size, playing around with different ones came minimize problems and achieve desired results. Also boost pressure can prematurely start to open wastegate with this setup slowing spool time, not really an issue with most wastegate cans that have the heavy spring, could be an issue with some cars though.

Note- The bleed valve in this system can be mounted inside the car which is handy for fine tuning desired boost level. (from thedodgegarage.com)
paulharbosky is offline  
Reply With Quote Quick reply to this message
Old 01-20-2013, 02:12 PM   #14
Re: need help overboosting problem  
TD New Guy
 
Join Date: Nov 2011
Location: Holland Mi

My Ride: 1990 Shelby Daytona
Engine: 2.5l t1
1/4: 0.000

Posts: 58
Feedback: (0)
danbosman is keeping the peace
thank you guys ill try these things when it stops blizzarding out here. i appreciate the help and ill let you know what i come up with. and id post some pics but i cant figure out how to lol.
danbosman is offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more! forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionaly, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.3.2

All times are GMT -5. The time now is 06:52 PM.