Are you looking to manually switch it, or do you want the vacuum/boost to do the switching automatically?

There are some OEM Selonoids out there that have 3 ports, 1 input, and 2 outputs,(or vise-versa) the output changes between ports when 12v is applied.

I might even have something like that in my "box-o-selonoids"

 

I'm having a hard time following exactly what you are wanting to do, but MAC valves can take one input and split to 2 outputs that you control on whatever voltage you specify. They cost about $75 but are made to last forever. I've used them with 100lbs of air pressure with no problems at all.

 

youre probably looking for a pressure transducer.


www.mcmaster.com

PS hobbs switches are threaded and there are nipple adapters. I really am still kinda sloudy on what youre looking for.

 

The factory fuel pressure solenoid would do what you want if I understand your request. A manually controlled electric switch that can turn on a solenoid valve. If that is correct, someone who has removed the solenoid would probably be happy to sell you one cheap. Without the manual or part in front of me, I can't be sure.

Jeff

 

Sorry its not clear. Since this is something I want for my car and won't be selling I will spill the beans. It may not work. What I want is to use a vaccume/boost source at the plenum. Run the hose into this unit. Coming out of this unit will be two vaccume/ boost lines From each line will be a MBC. I will leave one MBC set at a low boost for launch and flip the switch and the boost/vaccume goes to the other output and controls the other MBC at a higher boost level. So two very simple MBC's with this switch determining which MBC gets the plenum pressure. the one that is switched off will be doing nothing. This should give me a on the fly dual MBC for less then the turbo XS dual MBC. This is if it works at all.

 

This is if it works at all.

It worked for me, although under slightly different circumstances..........I rigged up a "mercy switch" to my Starion that in 1 position it fed the wastegate direct (WG adjusted of course) and the other at some other boost setting.......can't remember exactly, it was a long time ago.

What i described in my post earlier is what you need, a 3 port selonoid with 1 port common......

 

I knew i saw that thing around here recently.
The pic shows how i had it hooked up, not sure if introducing another mbc would effect the other setting.......it shouldn't, i think the bleeding only effects the output of that peticular mbc.

Just let me know what address you want it sent to..........

 

Sorry if i was out of line, i was only wanting to help you out..............

 

Thanks, Jack! I will Email you my address. Remember!! I am one of your friends on this board. I doubt you will EVER be out of line with me. And THANK YOU for the help. I try not to stay online as much and this was as soon as I saw the 2nd message.

 

I am one of your friends on this board.

OK, for a while there i was thinking i lost the last one i had.............LOL

 

OK, for a while there i was thinking i lost the last one i had.............LOL

Ha-Ha- I feel like that everyday.

 

O.K. I found that I have more then enough of these to do the job since I removed my vaccume lines. There are two I am thinking of using, maybe I can get some input.
There is one selinoid with one port in and two ports out. One port is normally open and the other is normaly closed. With 12v the normally open one closes and the normally closed one opens. So I can run the hose off of the plenum into this selinoid. The port that is normaly open all the time will be the high boost since I am only using low boost at launch. The normally closed port opens when I apply 12V. This kills the high boost and will be my launch/low boost setting. It kills the high boost when no vaccume/boost travels to it. I run a hose out from each output to 2 seperate MBCs and each one has a line that that travels to the wastegate. Normally I would T it here but I can use the stock 4 way vaccume connector. From the 4 way I run Two lines, one to each wastegate. On the other 2 nipples One hose to each MBC. I have another selinoid that is a single in/single out and is normaly open. With 12v it just closes. I will put that in line on the high boost so with 12V it blocks the highboost line between the MBC and the 4 way connector. That way the boost won't be trying to travel back up the line into the highboost MBC. So when I flip the switch the selinoid change between boost controllers and the single in single out closes and isolates the high boost MBC all together. I need a single in /single out that is normally closed and opens w/12v to go between the 4way and the low boost MBC. Unless no one sees a problem with boost flowing back into the low MBC and creating havoc.
Plese give me your input. Thanks, Mike

O.K. this is easier then I thought. The stock EGR selinoid is normally closed and opens with 12V. So out of the removal of all of the vaccume line I have the 3 selinoids to make this happpen. Now all I need is a cheap MBC. Who has the instructions for the home depot MBC? It won't see more the 10 psi on the low setting and may never be changed from the loweset setting of 6psi. Being broke makes you think..What if??

 

I think you could get by with 1 selonoid if you hosed it up like in my picture, but with 2 mbcs instead of 1. (or run it the same as i was with 1 mbc)(running wastegates DIRECT on the TT conversion i just finished yeilds 10psi, not sure what you were thinking as far as a launch setting, or what psi you are getting direct)

Sounds like the 3 port FPR selonoid (with filter removed) will work the same as the one i used which was the starion egr selonoid.

 

I think you could get by with 1 selonoid if you hosed it up like in my picture, but with 2 mbcs instead of 1. (or run it the same as i was with 1 mbc)(running wastegates DIRECT on the TT conversion i just finished yeilds 10psi, not sure what you were thinking as far as a launch setting, or what psi you are getting direct)

Sounds like the 3 port FPR selonoid (with filter removed) will work the same as the one i used which was the starion egr selonoid.

6 or 8psi launch/ 12psi daily/ 15-16psi w/race fuel.

So would a MBC with the boost at it's lowest position be wastegate pressure? I am going to set my alky to staged with the 5psi hobbs triggered with a smaller jet and a 10 psi valve triggered with a larger jet. I could use the electrical current from the 10 psi hobbs to activate the 2nd MBC which I could set for as much boost and alky as the EGT's allow.
So it would be straight gate pressure to launch (if its low enough) flip the switch and activate the 1st MBC with about 8-10 psi and when it hits 10psi the hobbs valve for the mega alky will open the boost up to warp speed. Or warp explosion.
I need to think about this. Coupled with a lower revlimiter and boost control I could go WOt in 1st and where I'm really loosing it is in 2nd where I can't go to WOT until 6000RPM. If my boost was controlled I could take 2nd with the pedal to the floor and as the car was getting through the gear have it take max boost without me slowly giving it gas. This should stop the 2nd gear up in smoke off the gas deal. Once through 2nd gear it should be WOT/max boost unless I keep over powering the clutch. What would rock would to be able to trigger these selinoids via RPM. Do any of the ignition boxes offer outputs to do such a thing?

 

Which stock solenoid in our cars is Normaly OPEN and closed after power applied one? I want to buy some but don't know which one to request.

 

another thing to look at might be if the selonoids themselves have limitations.
like say instead of an mbc maybe you could use a 1st gen boost selonoid for part of your set up and maybe get off a bit cheaper, or maybe some of you ppl know of some other cars we could get these from with different settings. either way this is a great idea. i was actually planning to purchase an a-vcr to get this type of function as i'd like to come off the line at 6psi and then work my way up to about 14-15 psi with propane. if you get a set up working like this be sure and put up some nice detailed instructions for us whenever ya get the time.

 

Hey Mike,
I can't drink enough coffee to keep up with your last post, give me a call if you want.

Something else i tried after getting bored with the mercy switch.................A co-worker of mine who was a computer engineer wrote some software for some kind of Chip to control a selonoid. He rigged it up with a pot (read potentiometer) so i could control the boost electronically (by changing the waveform applied to the selonoid)

It worked OK, but needed some fine tuning to work right. He got busy with work and we never finished the project.

Low and behold, 3 years later HKS came out with the EVC-EZ which is basically the same as what we were doing............

 

Hey Mike,
I can't drink enough coffee to keep up with your last post, give me a call if you want.

Something else i tried after getting bored with the mercy switch.................A co-worker of mine who was a computer engineer wrote some software for some kind of Chip to control a selonoid. He rigged it up with a pot (read potentiometer) so i could control the boost electronically (by changing the waveform applied to the selonoid)

It worked OK, but needed some fine tuning to work right. He got busy with work and we never finished the project.

Low and behold, 3 years later HKS came out with the EVC-EZ which is basically the same as what we were doing............

What I was saying was for launch just runs WG pressure...It's as low as I'm going to get and my alky will be triggered at 5psi as it always is. I have enough alky flow with one jet to get 12 psi and safe EGT's and no timming pull. Have the 1st MBC set at 12 psi. So the car when out of launch mode or WG pressure will boost to 12 psi and I have enough alky to cover that. Then have a switch that arms the hobbs valve for the 2nd alky jet. It will be set to come on at 12 psi. The secondary hobbs valve sends an electrical current once 12 psi is reached to the water selinoid to allow pressure to the second jet. I can also run current to a selinoid that allows pressure to the high boost 14-15 psi MBC.
So for daily driving I can just leave the car as is and I have enough alky and boost for 12 psi. If I arm the 2nd hobbs valve. At 12 psi my secondary hobbs valve lets alky flow to the second alky jet and at the same time feeds current to the selinoid that allows the highest boost MBC to come on line.
This way I could run WG pressure to launch. I would probably put a push button on the shifter and when it was down I would have WG pressure. I release it and have 12 psi and if I arm the "Ohshit" switch. Once I hit 12 psi I get the extra alky and boost to probably 15psi. You can't increase the alky for higher boost in a single stage because its too much alky at lower levels. I.E. Enough alky at 15 psi to have good EGT's gives you about 1400F at redline in 3rd gear @12psi. and the car hates it.
What I mentioned about MSD boxes. I wondered if anyone made one that sent out voltage at certain RPMs that could be changed and that could control these selinoids. So I could set the box to open a MBC at a certain RPM.

 

OK, your doing 3 settings, i was wondering why you needed 2 selonoids.........not sure about the rpm switch but it sounds like your on the right track.

Are you only getting 5psi WG pressure??

 

MSD makes a rpm switch.
I can get them for around $100 with rpm pill.
Summit is probably about $10 cheaper.