hot start solenoid??

[bentvalves]

Are you guys running all this crap, or do I just pull vacuum from the back of the plenum for the FPR and butterfly solenoid, and bin all that garbage behind my strut tower?
Modified by ks13 at 7:42 AM 2/3/2007

[float_6969]

First off the stuff you took a picture of is for the butterfly's, not the hot start. The hot start is underneath the ignitor on the exhaust side of the engine bay.

Since you've got a Jspec S13, I would leave all of it and hook the lines up as the factory intended.

For most of us, we never got any of that stuff, so we can't hook it up correctly.

If hooked up properly, your butterfly's will function as intended.

[Chris859]

[nocwage]

If it works keep it, mine stopped working so it's currently disconnected..

HOWEVER, I made a lot more low-end torque with it connected than disconnected..We're talking like 25lb-ft until 4500rpm..

Some people pay thousands to gain that much...at 3100 rpm I was making 125lb-ft with it connected and 100lb-ft with it disconnected.. 175lb-ft vs 150lb-ft at 3800... etc etc..

(I disconnected it because the valves never opened due to some problem with it..)

[bentvalves]

so is it that vacuum canister that controls the butterflies behind the strut tower, or is it the solenoid which cant really be seen clearly.

float....in the last pic next to the butterfly actuator, there is a piece of vacuum hose that used to get routed to this "vacuum/water" line to turbo piece; 2 pieces of hardline attached together, with a banjo fitting on one end for the turbo. Does that vacuum line go to the hot start, and lastly do you have your hot start hooked up?

[float_6969]

Ok, the big black plastic thing is the vacuum canister. The small thing with the wires next to the canister is the solenoid that applies or removes vacuum to the butterfly actuator. The purple check valve looking thing is the line restrictor so that movement of the butterflies is smooth and somewhat slow.

Last post

This should help too

[bentvalves]

theres a purple colored restrictor and a tan colored one as well I think. Do you know what the other one is for?

and the vacuum canister, is strictly for the butterflies, yes?

thanks a bunch man.

[RS12Turbo]

hmmmmm, I have all this stuff left over from my clip.......so now the word is it's best to leave hooked up? When I asked a few months ago, it seems like I was told it was easier and not needed to have it hooked up, and was given a vac diagram to use without it.So, you actually gain power leaving it hooke up? The butterflys don't function properly when hooked up using the simple vac diagram thats posted up?Hmmmmmmm, i'm confused

[nocwage]

hmmmmm, I have all this stuff left over from my clip.......so now the word is it's best to leave hooked up? When I asked a few months ago, it seems like I was told it was easier and not needed to have it hooked up, and was given a vac diagram to use without it.So, you actually gain power leaving it hooke up? The butterflys don't function properly when hooked up using the simple vac diagram thats posted up?Hmmmmmmm, i'm confused

It's 'easier' to not do it because not doing things is always easier than doing it.But the proof is in the pudding my friends.

Disconnected: http://www.westd.ca/gallery/di...pos=2

Connected:http://www.westd.ca/gallery/di...pos=3

now.. I had a problem where they didn't OPEN EVER which you can see in the 'connected' graph..Also the 'connected' graph is at 16psi vs disconncted @ 14.5 but since it's a T3 turbo you KNOW i'm not making full boost at 3100 where you can CLEARLY see the benefit of the system in action.

Btw if you click the pic you'll get a better full rez version.

It's not that they 'don't' work when you hook them up directly, it's that they don't work the way they were intended to work..When they go from seeing vac at idle and then pressure at anything above it they are pretty much just open ALL of the time.I also found that my car ran a LOT better with them disconnected than with them BYPASS connected (i.e. directly to the intake). When it was connected this way I found the car did weird things when transitioning from vac to boost.And of course it ran BEST when they were connected the factory way. (They just didn't open at high rpm..)

[float_6969]

The problem is that for most people the effort required to make them work properly isn't "worth" it.

To have it work properly you need a vac canister, run more vac lines, you have to find the correct wire in the harness, you have to connect it to a solenoid, you have to run power to the solenoid, you have to find the correct size restrictors (harder than it sounds, I had to make mine), and get a check valve.

Or you can leave them unhooked.

With my standalone it wasn't a big deal as I was doing a bunch of work anyway. In hind site, I would have hooked them up properly when I put the motor in the first time as the difference it makes is quite noticeable.

I also suspect that the difference becomes even more noticeable the larger the turbo.

[bentvalves]

How do I determine If my power fc has provisions for the butterflies? I purchased the pfc off of ebay from japan. I contacted the seller, but he wasnt able to give me any information.

[RS12Turbo]

How does the vac pump get power? "Ignition on" source? On mine there is a 2 wire plug that looks like the coolant temp sensor plug that has the metal clip that holds it on.......and it's bundled up with another 2 wire plug thats flat....and if I remember correctly that plug went to the wiper motor.I put power to mine yesterday, and the solinoid just clicked.....does this sound normal......or should the pump start pumping when it has open vac lines?I wonder if I can just use my s12 vac pump thats already in place? I have all the check valves from the s13 pump......might be easier to just do that.

[nocwage]

The solenoid is just a switch, it doesn't make the vacuum, the vacuum pump is pneumatic, the vac and boost in the manifold is what actually makes it work.

I used to work with label applicators and the one thing that ALWAYS blew people away was how we could generate vacuum with a system that was entirely pneumatic