Stock Wastegate No Boost - Dodge SRT Forum
 5Likes
  • 1 Post By Simon.Starkie
  • 1 Post By Modz 4 Higher
  • 1 Post By Simon.Starkie
  • 1 Post By Modz 4 Higher
  • 1 Post By blackbird_R/T
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 05-08-2019, 09:34 PM Thread Starter
New Member
 
Modz 4 Higher's Avatar
 
Join Date: Apr 2019
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Garage
Stock Wastegate No Boost

So when I purchased my car it had an AGP WGA off PCM boost w/ TurboXS BOV. I wanted to go all back stock so I put a used stock WGA on it, a mopar blue pate and factory cold side pipe. I also purchased a brand new vacuum harness from Modern since all of my lines were non existent.

I got the solenoids out of the hole from behind the driver headlight and hooked them up. The stock WGA is making a tinging noise around the flap using my stethoscope which I have heard of before going from an AGP back to stock. No biggie, however the car now on PCM boost makes barely any boost(1-2psi) and about 15 on vac at idle. It worked fine before on the AGP off PCM boost so I am thinking maybe a solenoid. However, gonna pop the AGP back on tomorrow on PCM and see what it does. Usually a bad WGA would over boost and that is not the case here, but I am hoping it will fix my problem.

Anybody have an idea of what could be wrong?

Thanks in advance,
Modz

Modz
Modz 4 Higher is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 05-09-2019, 04:27 AM
Premium Member (Lifetime)
 
gump1114's Avatar
 
Join Date: May 2005
Location: Byron, GA
Posts: 3,125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Garage
Lifetime Premium Member
sounds like a bad boost leak to me. Especially after changing up so much with boost/vacuum lines. you need to boost leak test the system.


435 HP & 438 TQ -E85
Tuned by Turbo666 on his mustang dyno

Best ET to date: 12.1 @ 124 on DR's
gump1114 is offline  
post #3 of 12 (permalink) Old 05-09-2019, 08:18 AM Thread Starter
New Member
 
Modz 4 Higher's Avatar
 
Join Date: Apr 2019
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Garage
You would basically need an intercooler pipe completely removed to get no boost lol.

Modz
Modz 4 Higher is offline  
 
post #4 of 12 (permalink) Old 05-09-2019, 09:29 AM
SRTforums Member
 
Join Date: Jun 2003
Posts: 3,783
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
This may b a long shot but worth a try and it only takes < 5 minutes.

A friend had a similar "noboost" problem on his car several years ago (2003).
He had the WGA Pressure line (black looping to green at the turbo) connected to the wrong port on the solenoid.
It's been a long time, but it may have been the Green #2 solenoid that was involved.
Basically, the black-to-green WGA pressure line was connected to the bottom port.
I switched it to the top port on the solenoid and voila, normal boost.
This was a very long time ago but see if switching the solenoid ports around on #2 Green solenoid helps.
Simon.Starkie is offline  
post #5 of 12 (permalink) Old 05-09-2019, 10:09 AM
SRTforums Member
 
Join Date: Jun 2003
Posts: 3,783
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
Maybe these pictures will help.
Note from the decal picture where the GREEN line (turbo pressure source) attaches to Solenoid 2.
And where the BLACK line (WGA pressure source) attaches to Solenoid 2.

DerrickA likes this.
Simon.Starkie is offline  
post #6 of 12 (permalink) Old 05-09-2019, 04:31 PM
SRTforums Member
 
DarKKnight54's Avatar
 
Join Date: Jun 2013
Location: MO
Posts: 272
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 52 Post(s)
Garage
Im not sure what the issue is with the odd sound from the flapper.

I was just going to say when you change a wastegate need to re set your battery so the pcm re learns its duty cycles. Then do some light driving for a few miles, a few shift sequences before going wot
DarKKnight54 is offline  
post #7 of 12 (permalink) Old 05-09-2019, 04:35 PM
SRTforums Member
 
DarKKnight54's Avatar
 
Join Date: Jun 2013
Location: MO
Posts: 272
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 52 Post(s)
Garage
Also, if its the AGP adjustable WG then just put the 8lb spring in it and hook the line up like factory and you should be able run it on pcm control
DarKKnight54 is offline  
post #8 of 12 (permalink) Old 05-10-2019, 11:00 PM Thread Starter
New Member
 
Modz 4 Higher's Avatar
 
Join Date: Apr 2019
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Garage
Thanks everyone. I ended up putting the AGP back on, just on PCM boost and it runs flawless.
Simon.Starkie likes this.

Modz
Modz 4 Higher is offline  
post #9 of 12 (permalink) Old 05-11-2019, 12:51 AM
SRTforums Member
 
Join Date: Jun 2003
Posts: 3,783
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
Quote:
Originally Posted by Modz 4 Higher View Post
Thanks everyone. I ended up putting the AGP back on, just on PCM boost and it runs flawless.
Glad to hear it!
I ran mine like that with Stage 1 PCM and Stage 1 injectors (2003 Stage 1's needed bigger injectors) back in mid 2003 to mid-2004 before installing Stage 3 + Toys.
It was fun and ran pretty good like that (just AGP WGA, no MBC) as long as I kept the boost from spiking more than 18.4 PSI which was just about the accuracy limit for the stock MAP sensor.
Lots of guys ran like that because it was just the beginning.
Big turbo setups were cool but the tuning was handicapped with piggy back PCM's like Greddy eManage which were the best available (if you spoke Japanese) short of a stand alone.
Modz 4 Higher likes this.

Last edited by Simon.Starkie; 05-11-2019 at 01:01 AM.
Simon.Starkie is offline  
post #10 of 12 (permalink) Old 05-12-2019, 12:55 AM Thread Starter
New Member
 
Modz 4 Higher's Avatar
 
Join Date: Apr 2019
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Garage
Yep, that is where it all began for me. My last NSRT4 was a 10 second car. I am NOT going that route again. It was a blast, I just want to keep this CE as close to stock as possible.
Simon.Starkie likes this.

Modz
Modz 4 Higher is offline  
post #11 of 12 (permalink) Old 05-15-2019, 10:58 AM
SRTforums Member
 
blackbird_R/T's Avatar
 
Join Date: Nov 2003
Location: Boston, MA
Posts: 7,281
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 127 Post(s)
For future troubleshooting, an easy way to verify the boost control system and wastegate actuator (WGA) is working is to temporarily disconnect the factory boost reference line that goes from the boost control solenoid to the WGA vacuum canister and run a direct vacuum line from a manifold reference point to the WGA.

That will provide boost up to the internal spring tension, which for a stock WGA should be around 4-8 psi (it will also ramp up slowly). That will show the internal diaphragm in the WGA canister is working correctly and nothing has broken. If you're still getting no boost, you can completely remove the vacuum line, leave it disconnected, then very carefully drive the car and try to get into boost. You have to be prepared to immediately get off the throttle as it should spike to max boost the spring tension in the WGA will support since there isn't any boost reference on the other side of the diaphragm to cancel it out. If it doesn't spike up there might be a mechanical problem with the flapper valve broke or not sealing.


For anyone reading this and not familiar with how the stock WGA and solenoid works, the internal spring in the WGA canister is always trying to pull the wastegate flapper valve in the turbo housing shut, which would make full boost as it forces all the exhaust gasses over the turbine wheel. To counteract that and keep the flapper valve open, boost pressure is applied to the other side of the WGA diaphragm to push against the WGA spring and keep the wastegate flapper valve open.

On stock computer controlled boost, the boost control solenoid sits between the boost pressure building in the turbo and intake tract and the WGA, then cycles open and closed (duty cycle of open-to-closed) which allows a controlled amount of boost pressure to reach the WGA to counteract the internal spring and keep the turbo producing the desired boost level.
Modz 4 Higher likes this.

Eric H. - '04 Neon SRT-4 (eBlue/S2) - '92 Dodge Daytona IROC R/T
'91 Dodge Spirit R/T - '19 Pacifica Hybrid Limited - '14 CTS-V Wagon
'08 Cobalt SS Turbo - '14 Cruze Turbo Diesel - '02 SVT Focus (S/C)
'04 SVT Focus (EAP) - '07 Ram 1500 - '81 & '85 Chevy Citation X-11
'90 Pontiac Turbo Gran Prix (ASC/McLaren) - '93 Olds Achieva SCX W41
blackbird_R/T is offline  
post #12 of 12 (permalink) Old 05-15-2019, 04:36 PM
SRTforums Member
 
DerrickA's Avatar
 
Join Date: Jun 2017
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Garage
I would like to add that if your W/G pin rusts and decides to break and take a permanent vacation, letting the actuator linkage pop off, ahem, on the way to work one morning lol, it will make absolutely no boost. Fact.

Derrick Argabright
DerrickA is offline  
Sponsored Links
Advertisement
 
Reply

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
HOW-TO: Dual Stage Automatic Boost controller 91CavGT How To Forum 281 07-06-2013 11:46 AM
Wastegate actuator and boost controller observations bluesrt Performance Modifications 0 05-24-2004 08:10 PM
Symptoms of a faulty stock WGA? UAL_Kingpin SRT-4 Discussion 0 04-13-2004 01:16 PM
Is it easier to control the boost with an external wastegate setup? wfosrt Performance Modifications 2 02-12-2004 01:13 PM
Boost dropping off to 10 Psi with F.M wastegate and stage 1 Sean T. SRT-4 Discussion 0 01-10-2004 03:27 PM

Posting Rules  
You may not post new threads
You may not 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

 
For the best viewing experience please update your browser to Google Chrome