88 Mazda 626 Garrett VGT MS2Extra
02-12-2009, 01:15 PM
#22
1.5 BAR
Join Date: Mar 2005
Posts: 723
Re: 88 Mazda 626 Garrett VGT MS2Extra
Unfortunately I'm not well versed in the MS2 world, and I dislike complex electrical "solutions" wheras OEM's do. I'm curious if you couldn't take a cheap motorola MAP sensor's linear voltage output, use that to control a simple transistor power circuit, and work it via amps-vs-boost. I know most simple circuits use resistors as the voltage-out control, but I'm sure their's either one with voltage-input control, or can be done with some electrical tomfoolery. I'm not much of an electrical engineer, but I know someone who is.
Aero one other thing I was thinking about using for another app was a mini pressure regulator. Setting it a little higher than the WG spring (and its bleed flow) will allow it to open 100% eventually, but allow it to open more gradually. An MBC would obviously allow a higher initial opening, but would also help prevent premature opening. With the pressure regulator and a vacuum box/reservoir, it would help premature opening even more, but at the expense of non-linear actuation (speeds up with boost).
You could also give me $30 for a MAC boost solenoid, then add a Hobbs switch and it would never open prematurely.
Aero one other thing I was thinking about using for another app was a mini pressure regulator. Setting it a little higher than the WG spring (and its bleed flow) will allow it to open 100% eventually, but allow it to open more gradually. An MBC would obviously allow a higher initial opening, but would also help prevent premature opening. With the pressure regulator and a vacuum box/reservoir, it would help premature opening even more, but at the expense of non-linear actuation (speeds up with boost).
You could also give me $30 for a MAC boost solenoid, then add a Hobbs switch and it would never open prematurely.
02-12-2009, 03:43 PM
#23
1.0 BAR
Join Date: Dec 2006
Posts: 311
Re: 88 Mazda 626 Garrett VGT MS2Extra
Originally Posted by HiProfile
Unfortunately I'm not well versed in the MS2 world, and I dislike complex electrical "solutions" wheras OEM's do. I'm curious if you couldn't take a cheap motorola MAP sensor's linear voltage output, use that to control a simple transistor power circuit, and work it via amps-vs-boost. I know most simple circuits use resistors as the voltage-out control, but I'm sure their's either one with voltage-input control, or can be done with some electrical tomfoolery. I'm not much of an electrical engineer, but I know someone who is.
Aero one other thing I was thinking about using for another app was a mini pressure regulator. Setting it a little higher than the WG spring (and its bleed flow) will allow it to open 100% eventually, but allow it to open more gradually. An MBC would obviously allow a higher initial opening, but would also help prevent premature opening. With the pressure regulator and a vacuum box/reservoir, it would help premature opening even more, but at the expense of non-linear actuation (speeds up with boost).
You could also give me $30 for a MAC boost solenoid, then add a Hobbs switch and it would never open prematurely.
Aero one other thing I was thinking about using for another app was a mini pressure regulator. Setting it a little higher than the WG spring (and its bleed flow) will allow it to open 100% eventually, but allow it to open more gradually. An MBC would obviously allow a higher initial opening, but would also help prevent premature opening. With the pressure regulator and a vacuum box/reservoir, it would help premature opening even more, but at the expense of non-linear actuation (speeds up with boost).
You could also give me $30 for a MAC boost solenoid, then add a Hobbs switch and it would never open prematurely.
As for mine, I intended to try a couple different MBC's on the damn thing, but didn't get the chance to when the bearing went. It iwll be on the top of the things to do when I get it running again.
02-12-2009, 04:11 PM
#24
0.0 BAR
Join Date: Nov 2006
Posts: 0
Re: 88 Mazda 626 Garrett VGT MS2Extra
Originally Posted by aero
As for mine, I intended to try a couple different MBC's on the damn thing, but didn't get the chance to when the bearing went. It iwll be on the top of the things to do when I get it running again.
It's a bitchin' project.
02-18-2009, 02:25 AM
#25
1.0 BAR
Thread Starter
Join Date: Dec 2005
Posts: 206
Re: 88 Mazda 626 Garrett VGT MS2Extra
Well as an update, I installed some 40#(420cc) injectors tonight and was hoping to boost this thing more than 10psi. But at about 17-18 psi Im running out of fuel pump. Then was going to make some 13-15 psi pulls and one of my ------- spark plug wires fell off the distributer cap. I thought it something slightly more interesting and just limped the car home. That pretty much ended the night. It started snowing too, so not the greatest time for high boost tuning. :P
O, I installed a 38mm WG and am using that with a manual boost controller to ultimately control the boost. Without more sophistocated controls I just dont think its possible and Im not much of an electronics/computer nerd yet, so.......
O, I installed a 38mm WG and am using that with a manual boost controller to ultimately control the boost. Without more sophistocated controls I just dont think its possible and Im not much of an electronics/computer nerd yet, so.......
02-18-2009, 10:48 AM
#27
1.0 BAR
Thread Starter
Join Date: Dec 2005
Posts: 206
Re: 88 Mazda 626 Garrett VGT MS2Extra
----, if I had some I would. A friend that was over last night fo the tuning has some 660cc injectors and a 255 walbro that hes gonna let me use for awhile. when I get those in, then ---- will go down. 
02-18-2009, 05:07 PM
#29
3.0 BAR
Join Date: Oct 2006
Posts: 2,330
Re: 88 Mazda 626 Garrett VGT MS2Extra
Good stuff in this thread.
My friend in the R&D dept. at BW was saying that most of the VTG turbos built in the last 5 years will survive 1000deg.C for extended periods of time. Pretty impressive stuff considering the old #'s were in the 800c range. Nickel cadmium alloy for the vanes is the winner here.
Everyone should ride in a 997 Turbo at least once to truely experience the VTG magic. 500lbft at 2000 rpm is no joke. Reminds me of the origninal LSx series big blocks. Torque out the *** at any rpm, anytime.
My friend in the R&D dept. at BW was saying that most of the VTG turbos built in the last 5 years will survive 1000deg.C for extended periods of time. Pretty impressive stuff considering the old #'s were in the 800c range. Nickel cadmium alloy for the vanes is the winner here.
Everyone should ride in a 997 Turbo at least once to truely experience the VTG magic. 500lbft at 2000 rpm is no joke. Reminds me of the origninal LSx series big blocks. Torque out the *** at any rpm, anytime.
02-18-2009, 11:13 PM
#30
0.0 BAR
Join Date: Nov 2008
Posts: 0
Re: 88 Mazda 626 Garrett VGT MS2Extra
One of these days, I'll get the VGT on my 4age ST.
Considering putting 2 on the wife's stang.
Been struggling with work and all, so keeping a roof over our heads and food on the table comes first
Considering putting 2 on the wife's stang.
Been struggling with work and all, so keeping a roof over our heads and food on the table comes first
