What would be the best way to limit boost in 1st and 2nd gear using the MS2 pcb3 v2.888. See sig for car info. Basically if I could limit 1/2 to 5psi (current wastegate spring pressure) by leaving a GM solenoid closed then turning it on to bleed off the vac/boost line in 3/4 gear or mph based maybe.
Has anybody got this setup already? I tried searching and couldn't find anything besides basic boost control topics.
I guess to have this work I will need another sensor, preferably a MPH drive shaft type sensor setup that could be input for other cool MS stuff.
So basically I guess i have the MPH sensor as a on/off port input to turn the gm solenoid control on at a certain MPH to get boost control. That's basically. Does anyone have any more technical input for me to make this happen. If there was a simple mph sensor kit for Ms all sorts of cool info could be displayed like MPG horsepower etc.
All input greatly appreciated.
Mike
Boost Control (limiting boost in 1/2 gear)
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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MustangMike
- MegaSquirt Newbie
- Posts: 6
- Joined: Wed Dec 27, 2006 7:24 pm
- Location: Miami,FL
- Contact:
Boost Control (limiting boost in 1/2 gear)
MS2 v3.0 PCB, 2.89 firm, w Scotts Adpt board 2.0a
TunerStudio, LC-1 WB O2.
93' LX 5.0 5spd, Original owner 21k mi. Black on Grey
Turbonetics 62-1, GT40 Heads Port/Polish, Wolverine Cam, 70mm TB
TunerStudio, LC-1 WB O2.
93' LX 5.0 5spd, Original owner 21k mi. Black on Grey
Turbonetics 62-1, GT40 Heads Port/Polish, Wolverine Cam, 70mm TB
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Boost Control (limiting boost in 1/2 gear)
Considering that the 2.888 code doesn't have boost control at all, you're looking at some serious reprogramming to add this. I'm not a code guru, but you would need to use an unused analog pin either as a VSS input with a frequency to voltage converter, or make some sort of resistor box / voltage divider device on the shifter that would send a different voltage to the output depending on your gear position. Then you'd need to write a boost control algorithm.
It's possible the GPIO board may support this kind of thing too when it comes out.
It's possible the GPIO board may support this kind of thing too when it comes out.
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MustangMike
- MegaSquirt Newbie
- Posts: 6
- Joined: Wed Dec 27, 2006 7:24 pm
- Location: Miami,FL
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Re: Boost Control (limiting boost in 1/2 gear)
Thanks guys.
I guess I'll just wait for GPIO and hope.
I know there isnt really "code" for boost control, but MS is pretty versatile, and I was thinking that I could use the spareport setting to open a gm vacuum solenoid at xx map to bleed off boost. I was just trying to bounce it off the forums to see if anyone had any ideas for a speed input or some way to determine the other variable for the solenoid to open.
I guess I'll just wait for GPIO and hope.
I know there isnt really "code" for boost control, but MS is pretty versatile, and I was thinking that I could use the spareport setting to open a gm vacuum solenoid at xx map to bleed off boost. I was just trying to bounce it off the forums to see if anyone had any ideas for a speed input or some way to determine the other variable for the solenoid to open.
MS2 v3.0 PCB, 2.89 firm, w Scotts Adpt board 2.0a
TunerStudio, LC-1 WB O2.
93' LX 5.0 5spd, Original owner 21k mi. Black on Grey
Turbonetics 62-1, GT40 Heads Port/Polish, Wolverine Cam, 70mm TB
TunerStudio, LC-1 WB O2.
93' LX 5.0 5spd, Original owner 21k mi. Black on Grey
Turbonetics 62-1, GT40 Heads Port/Polish, Wolverine Cam, 70mm TB
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Boost Control (limiting boost in 1/2 gear)
Somebody tried using a generic on/off output for boost control a while ago - it didn't get a very steady boost level.