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Discussion Starter #1
Hello,

Currently I am experiencing an issue with my '14 GSR with a Precision 6266 turbo. I have an AEM 35-8460 boost gauge that only reads 0, whether I am idling or actually hitting boost. The gauge is running from the dash, into a T clamp with one end that goes into a Grimmspeed boost controller and the other into the BOV. I've checked the lines into the turbo and everything seems to be secure and the gauge is receiving normal power.

Any idea what might be going on?

Thanks in advance!
 

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Wait, your EBCS port connects to your BOV/DV directly? Am I getting this right?


EBCS === BOV
||
Sensor


To the best of my knowledge your EBCS shouldn't be connected to your BOV directly. One port is for the wastegate, one for the UICP vacuum source and the third port for the intake (optional). Don't remember which is which.



Maybe that's your problem there?
 

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Discussion Starter #3 (Edited)
Hey, thanks for the advice.

I believe so. I'll try to explain this the best I can as I did not install it this way. The gauge runs from the dash into the engine bay, then there is a T, one of those lines runs directly into the BOV and the other into the solenoid.

I don't recall seeing any other lines going from the wastegate to the gauge but there could be from the solenoid. I will have to verify this. However, I did think that it was weird that I wasn't able to locate a boost pressure sensor that was connected to the gauge.... hmm...

I also have a Turbosmart wastegate, not sure what the spring is rated for :(
 

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Ok, I'm not sure if the boost sources change when you have an EFR kit since you said you're running a 6266 turbo, but at least in a stock/stock frame turbo, no lines in the EBCS connect to your BOV directly.

https://www.evolutionm.net/forums/evo-x-how-tos-installations/483428-how-install-grimspeed-3-port-solenoid-2.html

The BOV line comes from the intake manifold.

Check that thread.

You'll have to figure out where the AEM boost sensor is and trace the line back. Is the vacuum line running through the firewall into the car? Make sure it's not pinched. My boost sensor is in the engine bay and it's only the wiring that goes through the firewall into the gauge. IMO the best and easiest place to tap a boost gauge is the Intake Mani <> BOV reference vacuum line, that's where mine is.

Who installed the turbo kit and other mods? Did you buy the car already like this?
 

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Discussion Starter #5
I bought the car with this configuration. Only the wiring is run through the firewall. I feel like I am missing a sensor... I will grab some pictures tonight for reference to better illustrate what I am trying to convey through text
 

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Ok, but you still need to figure out where that third line in your Tee is going into. If there's nothing at the end of it then you have a vacuum/boost leak.
 

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Discussion Starter #7
I've attached some photos to better illustrate what's going on.

From left to right, the wiring is from the gauge, then into the BOV, other end is going into the EBCM and feeds into the turbo.
 

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That second picture, where are those vacuum lines coming from? You have an open barb there. That's not good news.



Trace the lines off the EBCS and make sure they go where they're supposed to - one to turbo wastegate, one to compressor outlet, and top/center one to intake or VTA.



Like I said I don't know if EFR kits use different vacuum routing, so hard for me to give much input. I haven't seen a BOV hooked up directly to the EBCS though.



Then find out which of those lines have the tee and trace the teed
 

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What the heck? EBCS connect to BOV? WHY!?

UICP => EBCS => WASTEGATE is usually a correct combination
INTAKE MANIFOLD => BOV is another line

My boost gauge is T-eed in the Manifold to BOV line.
 

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Discussion Starter #10
Thank you both for the insight. I bought it like this, so I wish I could say that I knew what their reasoning was for doing that, but I don't know :(

I will toy around the configuration, but at least I know now that the BOV should never be directly connected to the EBCS.

Gonna end up just re-wiring and running the vacuum lines properly.

Thanks!
 

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Feel free to draw a diagram where the lines go. It's hard to see from the pictures. Does the car drive normally? Also, wondering how high your boost goes.
 

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Yeah, you haven't told us if you're having any issues besides the boost gauge. With a routing like this, I definitely think something would be wrong.
 

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Discussion Starter #13
The car drives alright. I'm working with Chet right now to get it up-to-snuff, but the process has been slower on my end while I work out some unforeseen kinks.

There is definitely a boost leak or some boost-cut at around 5k rpm, it builds boost fine and when it finally peaks I just end up revving out to like 6500-7000 rpm but the car is pulling me anymore. It feels almost like a clutch slipping out, but I'm actually running brand new Exedy Twin Disc clutch.

Other than that, the car is pretty mint. I will draw up a diagram of the wiring.

Thanks!!
 

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Ok, so that there is definitely an issue if you're not able to build boost past 5k.

Gotta check those lines. But if Chet's helping you out there's nobody better to help you square it away.
 

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The car drives alright. I'm working with Chet right now to get it up-to-snuff, but the process has been slower on my end while I work out some unforeseen kinks.

There is definitely a boost leak or some boost-cut at around 5k rpm, it builds boost fine and when it finally peaks I just end up revving out to like 6500-7000 rpm but the car is pulling me anymore. It feels almost like a clutch slipping out, but I'm actually running brand new Exedy Twin Disc clutch.

Other than that, the car is pretty mint. I will draw up a diagram of the wiring.

Thanks!!

Are you on TephraMod with NLTS enabled?
 

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Discussion Starter #16
Attached is a picture of my very (terrible) routing diagram.

No, I am not running a Tephramod.
 

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Did you buy the car from dealership by any chance? Because the level of "fuck you" in this vacuum routing is "used-car-dealrship-worthy".

Especially the open ended T, which basically just bleeds pressure from your vacuum control system.

Eh, you would need to reroute the whole system. The closer to stock the better.
 

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What the fuck is that routing.




Ok, my suggestion would be to just take the car to an evo-knowledgeable shop and have them sort it out for you, if you have the money. The way this thing is set up, I'm just afraid there are more gremlins under that hood that even if we help you fix the vacuum line routing, other problems might spring up. I can't imagine any tuner would have tuned the car like this but who knows if this wasn't the previous owner's handiwork.



This is like... Jesus man, when I did my EBCS and Intake I had pretty much never opened the hood of a car for more than a coolant fill, but at least I had a computer and google. I think my dog would have done a better job.
 

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Discussion Starter #19
Lol no, I bought it from someone I knew who got carried away on a few things... both of these replies are awesome. Thank you!!

It was inevitable I suppose.
 

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