Advantages of GM solenoid over MBC?
Jun 27, 2007, 10:06 AM
#16
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Personally adjusting your own boost has the potential to blow motors. At least tuning your car to a specific boost you should be more safe than manually turning your boost up and not being sure if your car is pulling degrees of timing to counter any knock.
Jul 3, 2007, 07:56 PM
#19
FYI those people that ordered the GM solenoid through RockAuto.com...They had been sitting on these from june 12th due to a glitch in the ordering system, NOT because AC-Delco was out of stock and not shipping.
After getting an email 2 days ago that siad the estimated ship date of Jun 29th was being extended to july 13th, i called them up and insisted THEY call AC-Delco to find out if the stock existed. Turns out there is not an back order...AC Delco has lots of these, in fact Rockauto also had them on the ****ing shelf too.
Upshot is my order was shipped today, and the other 38 lucky guys whose orders were being sat on too, will get orders shipped out ASAP too.
If anyone on this forum ordered from Rockauto, i would call them and insist the orders go out, and get a tracking number.
Hope this helps
Milburn
After getting an email 2 days ago that siad the estimated ship date of Jun 29th was being extended to july 13th, i called them up and insisted THEY call AC-Delco to find out if the stock existed. Turns out there is not an back order...AC Delco has lots of these, in fact Rockauto also had them on the ****ing shelf too.
Upshot is my order was shipped today, and the other 38 lucky guys whose orders were being sat on too, will get orders shipped out ASAP too.
If anyone on this forum ordered from Rockauto, i would call them and insist the orders go out, and get a tracking number.
Hope this helps
Milburn
Jul 8, 2007, 07:22 PM
#25
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Anyhow, i would be weary of hypocrits who propogated this "heresay" with an actual example of his own failure, whereas i had other problems. More interesting is when someone cites a simple 5 second guestimate on a strange anomaly, then proceeded not to resolve it and continue to "de"tune it.
But back on topic, the main arguement should be centered on mbc's vs. Stock bcs vs gm / other 3rd party solenoids. Imho, the main advatages people have alluded to before already, but keep in mind it cannot cure all boost taper. There are also physic limitations that no solenoid can overcome. It sure does help though.
Last edited by ST; Jul 8, 2007 at 09:59 PM.
Jul 10, 2007, 02:52 PM
#26
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So I'm wondering, if a methanol pump failed would controlling boost through the ECU save the motor by cutting boost as soon as knock is detected or does it not work like that?
Jul 10, 2007, 05:03 PM
#28
Evolving Member
hummm wouldn't a simply solution be a pressure sensor to sense no methanol pressure, hooked to a relay controlling your solenoid. No pressure, no open solenoid, WG level boost [shrug].
So long as the pressure sensor is designed to fail open, and the relay is normally open, and we already know the solenoid is normally closed ... worst thing that should happen is a false-failure, but false-good should be rare.
I can't be the first to think of this [shrug]
So long as the pressure sensor is designed to fail open, and the relay is normally open, and we already know the solenoid is normally closed ... worst thing that should happen is a false-failure, but false-good should be rare.
I can't be the first to think of this [shrug]
Jul 11, 2007, 07:48 AM
#29
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If controlling boost through the ECU will not save your motor from a meth failure or any other lean out or overboost conditions you can think of for that matter then what are the stock boost control safeguards that UCB is referring to? When will it save the motor, if at all, is what I am asking? Otherwise I think I am sticking with the MBC.
I am assuming here that the stock setup has a safe guard against overboost, e.g., if the fuel system slowly failed on a stock Evo, would it just lean out and blow or would the computer cut boost after detecting knock?
I am new to this so please excuse anything stupid I may have said or will say in the future. Thanks.
Jul 11, 2007, 08:38 AM
#30
the stock ECU's knock detection is the safe guard. when it detects significant knock, it pulls timing immediately. If knock continues it begins to run on the low octane fuel and timing maps. There are also boost limit values based on RPM that will cut boost/fuel when exceeded.
There is a "limp" mode on the stock setup, but I don't think it's known exactly how it works. There are multiple boost and WGDC maps, but everyone seems to get irregular results from changing only one of them. Some people are running on map 2, some on maps 2 and 3, some on 3 alone. So, if we could figure out which maps run in exactly which circumstances we could utilize the stock "limp" mode as overboost protection.
There is a "limp" mode on the stock setup, but I don't think it's known exactly how it works. There are multiple boost and WGDC maps, but everyone seems to get irregular results from changing only one of them. Some people are running on map 2, some on maps 2 and 3, some on 3 alone. So, if we could figure out which maps run in exactly which circumstances we could utilize the stock "limp" mode as overboost protection.