Over boost even with MBC all the way out.
#1
Over boost even with MBC all the way out.
I have a hallman boost controller, just the es basic one. Also running one of those ebay mbc valves. It seems that even with my valves loosened all the way out to 2-3 threads im still seeing 13 psi.
Mods are: hi flow cat, modified stock intake, and exhaust.
What else could be the problem.
Mods are: hi flow cat, modified stock intake, and exhaust.
What else could be the problem.
#2
Top's always down
iTrader: (5)
put your stock main cat back on and see if that fixes the problem. You might have to get your wastegate ported.
Also, make sure you connected your boost controller to the wastegate and not to the turbo precontrol.
And if you continue to have issues, you can always remove the pill from the vac line that goes to the waste gate which should put your boost at 7PSI.
Also, make sure you connected your boost controller to the wastegate and not to the turbo precontrol.
And if you continue to have issues, you can always remove the pill from the vac line that goes to the waste gate which should put your boost at 7PSI.
Last edited by SLOASFK; 05-16-08 at 05:23 PM.
#3
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I have a hallman boost controller, just the es basic one. Also running one of those ebay mbc valves. It seems that even with my valves loosened all the way out to 2-3 threads im still seeing 13 psi.
Mods are: hi flow cat, modified stock intake, and exhaust.
What else could be the problem.
Mods are: hi flow cat, modified stock intake, and exhaust.
What else could be the problem.
Disclaimer: I don't know what I'm talking about.
#4
Are you sure that turning the valve out is supposed to decrease boost? I thought those ebay manual boost controllers were bleed off valves aka. the more you turn the valve out the more pressure in the line is vented to atmosphere and less pressure is seen by the wastegate. This would cause high boost.
Try turning the valve all the way in to see what happens. Since you already claim overboost, it couldnt hurt. Or you could post pictures of your setup so we could see how it's connected.
Try turning the valve all the way in to see what happens. Since you already claim overboost, it couldnt hurt. Or you could post pictures of your setup so we could see how it's connected.
#5
The ebay boost controller (secondaries) is ball and spring type.
shown here:
and here is how I set up my boost controller. (taken from damians thread)
The black parts are where I installed 6mm caps and the orange and green lines are not connected to anything.
shown here:
and here is how I set up my boost controller. (taken from damians thread)
The black parts are where I installed 6mm caps and the orange and green lines are not connected to anything.
#6
here is his original diagram:
https://www.rx7club.com/3rd-gen-archives-73/my-boost-control-setup-perfect-10-8-10-pattern-178136/
as you can see I capped the wastegate actuators' shut and the line that follows that.
https://www.rx7club.com/3rd-gen-archives-73/my-boost-control-setup-perfect-10-8-10-pattern-178136/
as you can see I capped the wastegate actuators' shut and the line that follows that.
#7
Moderator
iTrader: (7)
I have a hallman boost controller, just the es basic one. Also running one of those ebay mbc valves. It seems that even with my valves loosened all the way out to 2-3 threads im still seeing 13 psi.
Mods are: hi flow cat, modified stock intake, and exhaust.
What else could be the problem.
Mods are: hi flow cat, modified stock intake, and exhaust.
What else could be the problem.
Dave
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#12
Loosened the pre spool MBC further and the damn thing blew off ( screw on cap). Crap loads of smoke and the idle has turned funny. Maybe I blew a rotor.
Anyway are the 2 stock wastegate pills the same size? Lookin to see what i get with one pill on the sec.
So is my diagram and setup correct?
Anyway are the 2 stock wastegate pills the same size? Lookin to see what i get with one pill on the sec.
So is my diagram and setup correct?
#17
Cheap Bastard
iTrader: (2)
What year? The reason I ask is that some of the 94 & 95 FD's turbos have restrictors built into the nipples (no pills). If you have those, you will not be able to create a larger opening in the line, and won't be able to decrease boost with a controller. The nipples will have to be drilled out.
#18
What year? The reason I ask is that some of the 94 & 95 FD's turbos have restrictors built into the nipples (no pills). If you have those, you will not be able to create a larger opening in the line, and won't be able to decrease boost with a controller. The nipples will have to be drilled out.
Don't mean to sound insulting, (and only asking this as I've done it before!) but double check the vcalves are definitely the right way round
Pills? No pills.
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Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM
backwards, boost, boostcontroller, controler, diagram, es, fd3s, hallman, install, integra, manaul, mazdaspeed, mbc, overboost, wwwmbcallcom