MBC=Blown Engine?
MBC=Blown Engine?
Hi Guys,
I was just wondering for those with EBC and MBCs. I currently have a Hallman MBC, however over the weekend a mechanic in my area told me to get rid of it and get an EBC. He was saying that the MBC is highly unstable and volatile and will eventually cause you to blow your engine.
My question is how can the MBC be any more unstable then an EBC if you have a boost gauge and know how much boost your getting and dont overboost. This is a reputable mechanic I trust so it kind of got me thinking. So I was wondering if this makes sense. Thanks all for your input.
I was just wondering for those with EBC and MBCs. I currently have a Hallman MBC, however over the weekend a mechanic in my area told me to get rid of it and get an EBC. He was saying that the MBC is highly unstable and volatile and will eventually cause you to blow your engine.
My question is how can the MBC be any more unstable then an EBC if you have a boost gauge and know how much boost your getting and dont overboost. This is a reputable mechanic I trust so it kind of got me thinking. So I was wondering if this makes sense. Thanks all for your input.
Evolving Member
Joined: Jan 2006
Posts: 245
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From: Florida
my mechanic also said the same thing when i mentioned a MBC, he said they are unstable, and the spring will eventually get stuck or somthing. From what ive HEARD MBC are good for getting rid of boost taper, and keep the boost constant. Not really for jacking up your psi, i guess a EBC would have more safty options if you were running too high of boost.
Im no expert, wait for some1 with more expirence to chime in.
Travis
Im no expert, wait for some1 with more expirence to chime in.
Travis
Yeah I have had my MBC for a few months now with no problem. And the reason I wonder is that he wasnt trying to get a sale cause he doesnt sell this stuff. I basically had him look over my car for boost leaks, cause he is kind of a family friend, and he just mentioned this to me.
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Originally Posted by fatalbert69
My question is how can the MBC be any more unstable then an EBC if you have a boost gauge and know how much boost your getting and dont overboost.
but it definitely doesn't = blown engine. if it did, there would be alot more "my engine is blown" posts on this forum since probrably 75% of us use a MBC to control boost. not all MBC's are created equal either, some bleed type MBC's are more problem prone.
Originally Posted by Warrtalon
The MBC is only as dangerous as its owner.
An MBC is unstable, but as Warrtalon said it depends on the owner. Climate change can drastically alter an MBC and the level of boost it puts out, while most EBCs will adjust for climate. If you have a boost gauge (duh) and don't mind pulling over every once in awhile to alter the boost to the normal level then you'll be fine. Mine raises about 3 lbs when the winter comes and drops about 3 when summer hits... and other weather conditions affect it as well.l Even running 3 lbs of boost more isn't going to automatically = a blown engine though.
An MBC follows the natural boost curve of the turbo / actuator setup. An EBC does not because the WG is controlled by a rapidly cycling solenoid. What this means in the real world (and for the EVO is) that the MBC tends to have a sharper boost curve hitting peak boost rapidly and falling rapidly based on the natural characteristics of the WG.
The EBC tends to have a flatter boost curve because it is able to independently control midrange boost while "holding" the boost pressure for top end.
Generally speaking an EBC is preferable on an EVO because it is able to level off the boost spike and hold more boost at higher RPMs without having to "hit" an insane amount of mid-range boost. When properly tuned, this usually means a flatter & broader torque curve. Another benefit is the user can control boost levels in car. Downside is the setup takes much longer with an EBC, and if improperly tuned, the results can actually be worse than an MBC. Another problem we encounter is the stock boost solenoid is maxed out at high boost pressures requiring some modification which results in a loss of resolution. A really good boost controller is the AVC-R (we are offering this at $449) which allows duty cycles to be set based on RPM. Most users find this boost controller difficult to tune, but it's great for big power cars.
If you're playing with an MBC or EBC be careful, we just received a GT35R car yesterday that has pieces of the stock rod lodged in the firewall and radiator. Cause? Improper EBC install.
Cheers,
Gary
Gruppe-S
The EBC tends to have a flatter boost curve because it is able to independently control midrange boost while "holding" the boost pressure for top end.
Generally speaking an EBC is preferable on an EVO because it is able to level off the boost spike and hold more boost at higher RPMs without having to "hit" an insane amount of mid-range boost. When properly tuned, this usually means a flatter & broader torque curve. Another benefit is the user can control boost levels in car. Downside is the setup takes much longer with an EBC, and if improperly tuned, the results can actually be worse than an MBC. Another problem we encounter is the stock boost solenoid is maxed out at high boost pressures requiring some modification which results in a loss of resolution. A really good boost controller is the AVC-R (we are offering this at $449) which allows duty cycles to be set based on RPM. Most users find this boost controller difficult to tune, but it's great for big power cars.
If you're playing with an MBC or EBC be careful, we just received a GT35R car yesterday that has pieces of the stock rod lodged in the firewall and radiator. Cause? Improper EBC install.
Cheers,
Gary
Gruppe-S
Originally Posted by Gruppe-S
An MBC follows the natural boost curve of the turbo / actuator setup. An EBC does not because the WG is controlled by a rapidly cycling solenoid. What this means in the real world (and for the EVO is) that the MBC tends to have a sharper boost curve hitting peak boost rapidly and falling rapidly based on the natural characteristics of the WG.
The EBC tends to have a flatter boost curve because it is able to independently control midrange boost while "holding" the boost pressure for top end.
Generally speaking an EBC is preferable on an EVO because it is able to level off the boost spike and hold more boost at higher RPMs without having to "hit" an insane amount of mid-range boost. When properly tuned, this usually means a flatter & broader torque curve. Another benefit is the user can control boost levels in car. Downside is the setup takes much longer with an EBC, and if improperly tuned, the results can actually be worse than an MBC. Another problem we encounter is the stock boost solenoid is maxed out at high boost pressures requiring some modification which results in a loss of resolution. A really good boost controller is the AVC-R (we are offering this at $449) which allows duty cycles to be set based on RPM. Most users find this boost controller difficult to tune, but it's great for big power cars.
If you're playing with an MBC or EBC be careful, we just received a GT35R car yesterday that has pieces of the stock rod lodged in the firewall and radiator. Cause? Improper EBC install.
Cheers,
Gary
Gruppe-S
The EBC tends to have a flatter boost curve because it is able to independently control midrange boost while "holding" the boost pressure for top end.
Generally speaking an EBC is preferable on an EVO because it is able to level off the boost spike and hold more boost at higher RPMs without having to "hit" an insane amount of mid-range boost. When properly tuned, this usually means a flatter & broader torque curve. Another benefit is the user can control boost levels in car. Downside is the setup takes much longer with an EBC, and if improperly tuned, the results can actually be worse than an MBC. Another problem we encounter is the stock boost solenoid is maxed out at high boost pressures requiring some modification which results in a loss of resolution. A really good boost controller is the AVC-R (we are offering this at $449) which allows duty cycles to be set based on RPM. Most users find this boost controller difficult to tune, but it's great for big power cars.
If you're playing with an MBC or EBC be careful, we just received a GT35R car yesterday that has pieces of the stock rod lodged in the firewall and radiator. Cause? Improper EBC install.
Cheers,
Gary
Gruppe-S
