Boost spikes 10psi, hold 5psi - Dodge SRT Forum
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post #1 of 16 (permalink) Old 03-20-2017, 04:30 PM Thread Starter
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Boost spikes 10psi, hold 5psi

Boost leak test done, only the block off plate (stock surge valve) is leaking.. very very minor leak (ordered new plate/gasket). No other leaks were found during the pressurized test and a smoke test.

Boost will spike at 10psi WOT and hold solid 5psi throughout the RPM range.
There isn't any other hesitation in the acceleration other than the lack of power.
Idle is fine, TPS and IAC have been rewired with no fluctuation in idle when wiggling the wires after it's been heated up.
Exhaust is open DP back

Stock WGA (ordered aftermarket), stock turbo

Codes thrown:
P0138
P038
P068

Any help would be appreciated.. I can list any other issues that might be related or modifications made if needed
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post #2 of 16 (permalink) Old 03-20-2017, 07:18 PM
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Boost leak, fix the block off plate and test again. Also bad O2 sensor or disconnected or broken wire. Both probably need changing if has not been done before.

Codes thrown:
P0138 - o2 sensor 1/2 voltage high
P038 - o2 sensor 1/2 heater circuit high
P068 - mainfold pressure/throttle position correlation- high flow/vacuum leak
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post #3 of 16 (permalink) Old 03-20-2017, 07:21 PM
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P0138 = rear o2 sensor voltage high (could be disconnected or removed)
P0038 = rear o2 sensor heater circuit high (same as above)
Poo68 = Manifold Pressure / Throttle position correlation

Have you checked the turbo for play or damage?
How many miles on the stock manifold? (Manifold could be cracked)
Where does the boost gauge sit engine off? at idle with a/c off? (The stock gauge is crap)
How long has it been doing it? Is it very cold where you live? (if stock it will boost lower the colder it is)
Do you have anyway to check the throttle position with a scan tool?

Dang it hybrid, I was typing :P
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Last edited by System_Crash; 03-20-2017 at 07:23 PM.
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post #4 of 16 (permalink) Old 03-21-2017, 09:33 AM Thread Starter
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I'll ring back in later once I replace the o2 and block off plate. I'll be putting a non fouler in the downstream soon too since the cat is removed.

I haven't took the turbo off completely, but the shaft doesn't seem to have much play after taking off the intake pipe and feeling around.

Stock manifold has around 60k miles on it.

Boost gauge sits between 0-1 psi when it's off.
Off the top of my head it sits around 15-17psi idle on the vac (I'm at work, if it's different I'll post an edit)
I don't use the a/c unless my kids are in the car (which isn't often).

I've had the car a couple weeks. I wasn't familiar with SRTs to much prior to purchasing this, so the issue has been since before I bought the vehicle.
i live in Florida, never cold.

No scan tool to check the TPS for correct voltage readings.

A buddy of mine says the wastegate may be stuck or not operating correctly. Still learning!

Thanks for the replies
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post #5 of 16 (permalink) Old 03-21-2017, 09:46 AM
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Post mods and anything you know about the car. Like your friend says the WG could be defective, the line and solenoid too. Stock WG and solenoid?
Change ALL fluids and perform general maintenance too.
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post #6 of 16 (permalink) Old 03-21-2017, 01:14 PM
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15/17 vacuum is too low. - should be 19-20 with a/c OFF You could have an intake leak or the timing off by 1 tooth.
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post #7 of 16 (permalink) Old 03-21-2017, 07:54 PM Thread Starter
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I'll be installing the AGP WGA within the next couple days.. stock wga right now, I think the wg solenoid may be bad so I'll see if anything changes with the AGP on since I'll bypass that solenoid anyway. It's about 17 on the vac side idle w/o ac.

HKS BOV.. checked all vac lines (cross-referenced aaronneons vac diagram). They're on point.

Injen intake/k&n filter. Boomba fuel rail (that's it for fuel mods as far as I know.. weird. Maybe a 255lph but wont know without dropping tank). BFMIC (All hoses/clamps leak tested), maddog sts w/booger bushings.

I dont know if the pcm has ever been flashed.

Since the stock boost gauge is reading 1-2 higher when the car is off.. wouldn't that mean 17-18 vac is right? First boosted car. Lots of learning to do.. thanks guys!
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post #8 of 16 (permalink) Old 03-22-2017, 07:28 AM
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Quote:
Originally Posted by andarou View Post
I'll be installing the AGP WGA within the next couple days.. stock wga right now, I think the wg solenoid may be bad so I'll see if anything changes with the AGP on since I'll bypass that solenoid anyway. It's about 17 on the vac side idle w/o ac.

HKS BOV.. checked all vac lines (cross-referenced aaronneons vac diagram). They're on point.

Injen intake/k&n filter. Boomba fuel rail (that's it for fuel mods as far as I know.. weird. Maybe a 255lph but wont know without dropping tank). BFMIC (All hoses/clamps leak tested), maddog sts w/booger bushings.

I dont know if the pcm has ever been flashed.

Since the stock boost gauge is reading 1-2 higher when the car is off.. wouldn't that mean 17-18 vac is right? First boosted car. Lots of learning to do.. thanks guys!
With the AGP you have to be more careful if something else is causing the boost spike. The spring in it is stiffer.
What do you mean you will be bypassing the boost solenoid?
Yes, that gauge needs to be changed.
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post #9 of 16 (permalink) Old 03-23-2017, 10:54 AM Thread Starter
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Definitely right. I installed the AGP and boost definitely went over 10psi. Drove once down the street. I need to fix the vac lines before it's drivable. Oh, I meant the wastegate solenoid delete now that I'm using a rice plate on the turbo and a BOV on the IC piping with the AGP wga.
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post #10 of 16 (permalink) Old 03-23-2017, 03:18 PM
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Quote:
Originally Posted by andarou View Post
Definitely right. I installed the AGP and boost definitely went over 10psi. Drove once down the street. I need to fix the vac lines before it's drivable. Oh, I meant the wastegate solenoid delete now that I'm using a rice plate on the turbo and a BOV on the IC piping with the AGP wga.
Why use both?

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post #11 of 16 (permalink) Old 03-23-2017, 10:10 PM Thread Starter
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Apologies. Still new to the lingo. I meant block off plate. Confused it with the mopar plate.
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post #12 of 16 (permalink) Old 03-27-2017, 03:02 PM Thread Starter
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Just an update:

Finished the wga install, rerouted and capped all necessary vac lines (though I don't have a bleeder on the turbo-to-wga line).. had some issues with the BOV (cheap knockoff), but initially I was spiking to around 19psi and would lower down to about 15psi. Seemed like the wga was the issue (solved?!), now I'm sure the BOV is leaking, but that's an isolated issue. Boost spikes to around 14-15psi and tapers off to 12psi no matter the adjustment to the wga.

If after I change out the BOV, there is any more issues (after leak test), I'll start a new thread an the separate issue.

Thanks again guys!
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post #13 of 16 (permalink) Old 03-27-2017, 03:36 PM
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Quote:
Originally Posted by andarou View Post
Just an update:

Finished the wga install, rerouted and capped all necessary vac lines (though I don't have a bleeder on the turbo-to-wga line).. had some issues with the BOV (cheap knockoff), but initially I was spiking to around 19psi and would lower down to about 15psi. Seemed like the wga was the issue (solved?!), now I'm sure the BOV is leaking, but that's an isolated issue. Boost spikes to around 14-15psi and tapers off to 12psi no matter the adjustment to the wga.

If after I change out the BOV, there is any more issues (after leak test), I'll start a new thread an the separate issue.

Thanks again guys!
If on stock turbo you're out of the efficiency range past 17. A spike of 15-17 and holding 11-14 is a great range. Sounds like the pcm figure out whats going on an adjusted accordingly. A temporary bump in boost will also happen if the battery is disconnected. Intake manufacturers would do this and post a dyno showing "proof" their intake gives a substantial gain.
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post #14 of 16 (permalink) Old 03-28-2017, 08:53 AM
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Quote:
Originally Posted by Slowryd View Post
If on stock turbo you're out of the efficiency range past 17. A spike of 15-17 and holding 11-14 is a great range. Sounds like the pcm figure out whats going on an adjusted accordingly. A temporary bump in boost will also happen if the battery is disconnected. Intake manufacturers would do this and post a dyno showing "proof" their intake gives a substantial gain.
PCM can't control boost anymore since he has the AGP plugged in directly.
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post #15 of 16 (permalink) Old 03-28-2017, 07:52 PM Thread Starter
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I'm pretty sure it's now related to the BOV.

The little round piece that I believe holds the lever in place broke off. I put it back on, but I'm sure that pressure is being release as if it were open all the time. There's a constant whistle of air at any throttle given.

New BOV should be delivered this week. Never going near 5k+ RPMs til I figure it out.
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