Spec V, first build, about $1000
12-02-2007, 10:54 PM
#221
0.5 BAR
Thread Starter
Join Date: Dec 2006
Posts: 141
Re: Spec V, first build, about $1000
Total cost in the boost controller so far, less than $20.
Theory:
The top port of the wastegate usually sees atmospheric pressure, so when the manifold is at 0 on the boost guage, the same amont of atmospheric pressure is acting on the bottom of the wastegate diaphragm as the top, at that point there is no pressure differential across the diaphragm. Like when the car is off.
I use a pressure regulator as a boost controller by altering the pressure differential acting on the diaphragm. If my wastegate spring stabilizes at 5 PSI w/o help form the boost controller, for every 1 PSI I regulate to the top port I increase my manifold boost by 1 PSI by altering the pressure differential, so to equal out pressure now it requires atmospheric + 1 psi on the other side of the diaphragm that sees manifold pressure. 2 psi regulated pressure equals atmospheric + 2 + the 5 the spring regulates, for a total of 7PSI.
Now anyone with a boosted spec knows 1st and 2nd gear are almost usless at 10 PSI, that's life. Now at say 5 PSI they're much better. If my spring allows me to run 5 psi, and w/ the boost controller I run 9-10, how can I run 5 then switch to 9-10?
An air solenoid. If I vent the pressure from the line feeding the pressure regulator I'll run 5psi, when I stop venting it'll run 9-10. So if I set up the soleniod tee'd into the signal line to my boost controller to vent when activated, I'll run 5psi. If I use a n open when powered solenoid, I can use a button mounted to my shifter to run run 5 psi whit the button pressed. That means I can leave the line in first gear at 5 PSI, shift to second at 5 PSI, and let off of the button when I shift to 3rd to run 10 PSI the rest of the run.
Nothing new, just putting it out there.
With the circuit open, air, boost or vaccum, will pass freely between 1 & 2.
With the circuit closed, or energized, air will pass freely between 1 & 3.
#4 is a filter to cap off whichever tube you vent.
Port 1 would go to the top port of the wastegate, between the GW and boost controller. Port 2 would go to the boost controller, and port 3 would vent.
when unenergized air will pass from the boost controller to WG like normal. When energized, port 2 would be blocked from the boost controller, and the top port on the WG would open to the atmosphere like there was no boost controller hooked up.
The button was fine but you have to remember to hold it down and fight the car w/ one hand:
Finally got around to making this automatic, first spec ever with Ghetto Traction Control (GTC). 1st and 2nd gear now automatically run 5psi. I plan on wiring in an override switch for what ever occasion would need me to run more than 5 psi in first and second. 3rd and up runs whatever the boost controller is set to.
This is how I was doing it, some times it gets harry trying to fight the spec w/ one hand when it makes whatever the hell it makes in 1st and 2nd at 5psi.
$2
Ghetto Tech custom fab work, need to make the ground wire prettier to be Ghetto Tech Certified.
This is a the selector lever on the transmission, for 1st and 2nd the arm swing as closes the switch and vents the MBC, for the rest of the gears the switch is open and the car runs what ever the MBC is set for
I think I'm going to wire the over boost function into the windshield wiper spray switch because I got rid of the washer fluid jug to relocate my battery. There is no need to ever overboost on anything other than a straight away, using the washer lever I can keep both hands on the wheel when laying on the extra power
Just because it's cheap doesn't mean it's crap.
If had $300 to drop I'd just get an AVCR or World Sport EBC, but I get bored and like to make stuff work.
Theory:
The top port of the wastegate usually sees atmospheric pressure, so when the manifold is at 0 on the boost guage, the same amont of atmospheric pressure is acting on the bottom of the wastegate diaphragm as the top, at that point there is no pressure differential across the diaphragm. Like when the car is off.
I use a pressure regulator as a boost controller by altering the pressure differential acting on the diaphragm. If my wastegate spring stabilizes at 5 PSI w/o help form the boost controller, for every 1 PSI I regulate to the top port I increase my manifold boost by 1 PSI by altering the pressure differential, so to equal out pressure now it requires atmospheric + 1 psi on the other side of the diaphragm that sees manifold pressure. 2 psi regulated pressure equals atmospheric + 2 + the 5 the spring regulates, for a total of 7PSI.
Now anyone with a boosted spec knows 1st and 2nd gear are almost usless at 10 PSI, that's life. Now at say 5 PSI they're much better. If my spring allows me to run 5 psi, and w/ the boost controller I run 9-10, how can I run 5 then switch to 9-10?
An air solenoid. If I vent the pressure from the line feeding the pressure regulator I'll run 5psi, when I stop venting it'll run 9-10. So if I set up the soleniod tee'd into the signal line to my boost controller to vent when activated, I'll run 5psi. If I use a n open when powered solenoid, I can use a button mounted to my shifter to run run 5 psi whit the button pressed. That means I can leave the line in first gear at 5 PSI, shift to second at 5 PSI, and let off of the button when I shift to 3rd to run 10 PSI the rest of the run.
Nothing new, just putting it out there.
With the circuit open, air, boost or vaccum, will pass freely between 1 & 2.
With the circuit closed, or energized, air will pass freely between 1 & 3.
#4 is a filter to cap off whichever tube you vent.
Port 1 would go to the top port of the wastegate, between the GW and boost controller. Port 2 would go to the boost controller, and port 3 would vent.
when unenergized air will pass from the boost controller to WG like normal. When energized, port 2 would be blocked from the boost controller, and the top port on the WG would open to the atmosphere like there was no boost controller hooked up.
The button was fine but you have to remember to hold it down and fight the car w/ one hand:
Finally got around to making this automatic, first spec ever with Ghetto Traction Control (GTC). 1st and 2nd gear now automatically run 5psi. I plan on wiring in an override switch for what ever occasion would need me to run more than 5 psi in first and second. 3rd and up runs whatever the boost controller is set to.
This is how I was doing it, some times it gets harry trying to fight the spec w/ one hand when it makes whatever the hell it makes in 1st and 2nd at 5psi.
$2
Ghetto Tech custom fab work, need to make the ground wire prettier to be Ghetto Tech Certified.
This is a the selector lever on the transmission, for 1st and 2nd the arm swing as closes the switch and vents the MBC, for the rest of the gears the switch is open and the car runs what ever the MBC is set for
I think I'm going to wire the over boost function into the windshield wiper spray switch because I got rid of the washer fluid jug to relocate my battery. There is no need to ever overboost on anything other than a straight away, using the washer lever I can keep both hands on the wheel when laying on the extra power
Just because it's cheap doesn't mean it's crap.
If had $300 to drop I'd just get an AVCR or World Sport EBC, but I get bored and like to make stuff work.
12-03-2007, 07:23 AM
#223
1.5 BAR
Join Date: Jul 2007
Posts: 752
Re: Spec V, first build, about $1000
good ideas :-)
ms2e is probably going to get gear referenced boost control in the future. that will be nice.
you should also know that if you want more than 10psi you can A leave nothing attached at all, and it will regulate at about 20psi or so (guess, but closish, i calculated my 15psi to open at 60psi with no feeds to the top) or if you want even more, you can take boost away from the bottom and add it to the top to get infinite boost ability.
i'll be experimenting extensively with that when i get home.
ms2e is probably going to get gear referenced boost control in the future. that will be nice.
you should also know that if you want more than 10psi you can A leave nothing attached at all, and it will regulate at about 20psi or so (guess, but closish, i calculated my 15psi to open at 60psi with no feeds to the top) or if you want even more, you can take boost away from the bottom and add it to the top to get infinite boost ability.
i'll be experimenting extensively with that when i get home.
12-03-2007, 07:29 AM
#224
0.5 BAR
Thread Starter
Join Date: Dec 2006
Posts: 141
Re: Spec V, first build, about $1000
Originally Posted by c0mpl3x
sweet ideas, lets see how well it works
Now it frees up the button to wire in an over boost switch
12-04-2007, 01:43 PM
#225
3.0 BAR
Join Date: Jun 2005
Posts: 1,623
Re: Spec V, first build, about $1000
yeah more drama for someone that claims to be such a good fabricator and designer ie first ever turbo spec v dude ur ---- isnt a specv v and nice crappyass bc douche bag hope it fails and blows ur pistons through ur hood, and i hear you keep talking ---- to dave still thinking you started the turbo kit with treadstone
12-04-2007, 02:49 PM
#226
3.0 BAR
Join Date: Dec 2006
Posts: 1,505
Re: Spec V, first build, about $1000
Originally Posted by gen4acclude
yeah more drama for someone that claims to be such a good fabricator and designer ie first ever turbo spec v dude ur ---- isnt a specv v and nice crappyass bc douche bag hope it fails and blows ur pistons through ur hood, and i hear you keep talking ---- to dave still thinking you started the turbo kit with treadstone
12-04-2007, 09:55 PM
#229
0.5 BAR
Thread Starter
Join Date: Dec 2006
Posts: 141
Re: Spec V, first build, about $1000
*sigh*
You mean this Dave?
in case you can't see the small text
In case you missed it
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putanynamehere.justgotowned.com for some custom pwnage w/o too much effort
You mean this Dave?
in case you can't see the small text
In case you missed it
gen4acclude.justgotowned.com
putanynamehere.justgotowned.com for some custom pwnage w/o too much effort
12-04-2007, 11:41 PM
#230
3.0 BAR
Join Date: Mar 2006
Posts: 5,631
Re: Spec V, first build, about $1000
Originally Posted by Big J
*sigh*
In case you missed it
gen4acclude.justgotowned.com
putanynamehere.justgotowned.com for some custom pwnage w/o too much effort
In case you missed it
gen4acclude.justgotowned.com
putanynamehere.justgotowned.com for some custom pwnage w/o too much effort
