Forge MBC Troubleshoot
Oct 16, 2005, 09:21 AM
#1
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Forge MBC Troubleshoot
What's up guys? I've had my Forge MBC for about a week now. I just found some time this morning to put it in. The mounting hardware that came with it is worthless unless you plan to mount it with a ziptie, but that's not the reason for this post. I installed the MBC into the car (replacing my old MBC) in what I think is the proper direction. I would not really know because there were no instructions or labels to tell me which line to hook up to which nipple. No biggie, I'm a big kid and can figure it out... So I install it, and turn it one click in the " + " direction and go for a drive to see where I'm at. When boost climbs to 25psi I let off the throttle and think, ok, I must have the lines backwards. So I switch them around and go out again. 4psi. Ok, now I think I'm moving in the right direction. I continue to turn it in the " + " direction after going out to see where I'm at. So after about another hour of driving around and testing it I can only get 14psi out of the MBC no matter how many clicks I turn it in the " + " direction. This is pretty frustrating.
Things to know: My boost source is right after the turbo, I DO NOT have it connected to the BOV vacuum source. T-Bolt clamps everywhere, and the car has been pressure tested to 25psi, so it's not a leak. I'm using the spring that came inside the unit, the additional spring that also comes with it is still in the box.
If anyone has experience with this MBC please let me know. Or hell, if anyone from Forge wants to chime in and help out that would be great also.
Cheers,
Greg
Things to know: My boost source is right after the turbo, I DO NOT have it connected to the BOV vacuum source. T-Bolt clamps everywhere, and the car has been pressure tested to 25psi, so it's not a leak. I'm using the spring that came inside the unit, the additional spring that also comes with it is still in the box.
If anyone has experience with this MBC please let me know. Or hell, if anyone from Forge wants to chime in and help out that would be great also.
Cheers,
Greg
Oct 16, 2005, 09:27 AM
#2
My first guess is the boost gauge. It's not even possible to run less than 11psi, because that's the minimum the wastegate will allow. If you saw 4psi, I'd be worried about factors other than the MBC.
The first scenario you gave was exactly what happens when the lines are backwards. The 2nd scenario sounds like you had it just right but were seeing 7 less psi than you should have.
The first scenario you gave was exactly what happens when the lines are backwards. The 2nd scenario sounds like you had it just right but were seeing 7 less psi than you should have.
Oct 16, 2005, 09:33 AM
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It's not the gauge, and I say this for a few reasons. 1. The gauge is less than a week old. 2. The boost controller I built from Home Depot parts works like a champ (and has for over 2 years) and I can boost 20psi all day long with it.
It's pretty easy to diagnose a boost controller when you have one that works and one that isnt working. Thanks for the reply though.
EDIT: Also, the wastegate will let you run whatever you have the boost set at. It wont let you run any more than 11psi if it's disconnected.
It's pretty easy to diagnose a boost controller when you have one that works and one that isnt working. Thanks for the reply though.
EDIT: Also, the wastegate will let you run whatever you have the boost set at. It wont let you run any more than 11psi if it's disconnected.
Last edited by QuickEvo; Oct 16, 2005 at 09:36 AM.
Oct 16, 2005, 09:46 AM
#4
Originally Posted by QuickEvo
EDIT: Also, the wastegate will let you run whatever you have the boost set at. It wont let you run any more than 11psi if it's disconnected.
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Oct 16, 2005, 07:47 PM
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Originally Posted by Warrtalon
Ah, I didn't know that. For the rest of us, whenever we install an MBC, even turned all the way out completely wide open, it never boosts less than 11psi. I've never heard of someone being able to make it go lower than the minimum stiffness of the wastegate...
On stock turbo, it shouldn't boost less than that.
Oct 17, 2005, 05:17 PM
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Stiffer spring will fix your problem...link below is how I intalled my Unos.
http://www.moto7.net/photos//displayimage.php?pos=-215
http://www.moto7.net/photos//displayimage.php?pos=-215
Last edited by Toobs; Oct 26, 2005 at 04:03 PM.
Oct 17, 2005, 05:33 PM
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Originally Posted by Toobs
Stiffer spring will fix your problem...
Oct 17, 2005, 05:42 PM
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I fail to see how one of those MBC's could go bad
With the stiff spring it should be good for 30 psi
Its fairly easy to install - I may consider doing a write up on how to install
With the stiff spring it should be good for 30 psi
Its fairly easy to install - I may consider doing a write up on how to install
Oct 18, 2005, 07:03 AM
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I worked up a brief set of "instructions" for the install of the unit after receiving a phone call from Greg concerning his issue.
I think the problems he is experiencing are an isolated incident and I am working with him to get it corrected.
Keep in mind, this product is a universal component applicable for numerous vehicles, so the instructions are also universal and generic in nature to accomodate installation on any application.
I'll post it up here soon!
I think the problems he is experiencing are an isolated incident and I am working with him to get it corrected.
Keep in mind, this product is a universal component applicable for numerous vehicles, so the instructions are also universal and generic in nature to accomodate installation on any application.
I'll post it up here soon!
Oct 18, 2005, 07:31 AM
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Forge Motorsport UNOS Installation
Before installing this product, please be aware of your vehicle’s OEM boost control system and routing of vacuum/pressure lines. These intricate details are specific to each application and will effect the installation, mounting location, and tuning of this product on your vehicle.
Ref. 1 - This port on the UNOS manual boost controller is the inlet of the unit and needs to have a pressure source taken directly from the outlet of the turbo or from the intake manifold. We highly recommend that the source be taken from the outlet of the turbo or the intercooler piping as close to the turbo outlet as possible, but the intake manifold can be used if no turbo outlet source is available.
__________________________________________________ ________________
Ref. 2 - This port on the UNOS manual boost controller is the outlet of the unit and is to have a pressure line connected to the pressure reference on the wastegate actuator or external wastegate, depending upon the application.
__________________________________________________ ________________
Please DO NOT install the UNOS manual boost controller in the opposite orientation or with the inlet and outlet ports connected to the opposite sources from those that are recommended above. Doing so will prevent the unit from operating properly and may cause damage to the mechanical components of the engine or turbocharger if not installed correctly immediately.
If you have any specific questions or concerns about the installation of this product, please contact your preferred Forge Motorsport authorized dealer, your vehicle’s tuner, or you may contact us directly.
Forge Motorsport
6536 Pinecastle Blvd. Suite C
Orlando FL 32809
(t) 407.447.5363 (f) 407.447.5361 (e) sales@forgemotorsport.com
Ref. 1 - This port on the UNOS manual boost controller is the inlet of the unit and needs to have a pressure source taken directly from the outlet of the turbo or from the intake manifold. We highly recommend that the source be taken from the outlet of the turbo or the intercooler piping as close to the turbo outlet as possible, but the intake manifold can be used if no turbo outlet source is available.
__________________________________________________ ________________
Ref. 2 - This port on the UNOS manual boost controller is the outlet of the unit and is to have a pressure line connected to the pressure reference on the wastegate actuator or external wastegate, depending upon the application.
__________________________________________________ ________________
Please DO NOT install the UNOS manual boost controller in the opposite orientation or with the inlet and outlet ports connected to the opposite sources from those that are recommended above. Doing so will prevent the unit from operating properly and may cause damage to the mechanical components of the engine or turbocharger if not installed correctly immediately.
If you have any specific questions or concerns about the installation of this product, please contact your preferred Forge Motorsport authorized dealer, your vehicle’s tuner, or you may contact us directly.
Forge Motorsport
6536 Pinecastle Blvd. Suite C
Orlando FL 32809
(t) 407.447.5363 (f) 407.447.5361 (e) sales@forgemotorsport.com
Last edited by Mike@Forge; Oct 18, 2005 at 07:33 AM.
Oct 23, 2005, 08:27 AM
#15
The stiffer spring has the boost swinging to 25 so I'm going back to the soft spring. The reason I went to the stiffer spring is because, when leak testing at lower boost levels, I heard the MBC sputtering.
Is the spring install as easy as taking the old one out and dropping in the new??? This seems that straightforward. Why would I get a weird sputter or flutter from the MBC?
Thanks! Sorry for the hijack, but seems pertinent ...
Is the spring install as easy as taking the old one out and dropping in the new??? This seems that straightforward. Why would I get a weird sputter or flutter from the MBC?
Thanks! Sorry for the hijack, but seems pertinent ...