Clue me in.

 

Twisted

May I ask, why the solenoid???

 

I'm not 100% sure what I'm talking about here, but does the boost solenoid not vent excess boost off into the exhaust? Well what if we were to replace the solenoid with a real blow off valve such as apexi or hks, this would allow adjustment of the boost blow off, maybe holding boost better. Just a thought.

 

So I can disconnect it.

 

O

 

We don't have a wastegate type valve you would typically see on a turbo engine to control boost pressure. The valve is closed at low vacuum (and obviously WOT) to allow full boost and open at high vacuum and cruising when boost isn't needed. Disconnecting it will actually reduce power and cause the intake air to heat up during normal driving. Without it, you also risk damage if you are at full boost and take your foot off the gas quickly.

Mark
'00 Lightning
'79 Corvette

 

Seems to be working fine for these guys:
http://www.powersurgeperformance.net...ML/000001.html

 

Mark_2kl
The solenoid is used only by the ecc to shut
off vacaum to the actuator witch is spring
loaded to turn boost off.If you fellow Brimstone's link you will see how to auj.
actuator.Hope this help's.
matt

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Sounds like one person had a misadjusted actuator and the rest of fell in line with a placebo effect.

The assumption goes like this: "There is something controlling maximum boost pressure. Let's disconnect it to get more boost." But if there were such a device, then no mod - smaller pulley, less restricted intake, etc - would cause an increase in boost, because that control device would simply dump the excess boost. Yet with these mods, there is an increase in boost pressure.
I'm not arguing that a misadjusted or improperly functioning actuator will cause low boost. I'm saying that there is no free power to be gained by disconnecting either the vacuum source or electrical connector.

From the 2000 F150 Volume 2 Ford Workshop Manual:

page 303-14-3
"The Supercharger Bypass Vacuum Solenoid will bleed off boost during sudden throttle closing. This prevents damage that can occur if the throttle is quickly closed while the engine is still under heavy boost."

page 303-12-4
"Note: It is not possible to increase manifold pressure or engine power output by altering the bypass valve or the actuator."

Mark
'00 Lightning
'79 Corvette

 

Mark_2kL,
Since you read that PSP post then you aleady know why we disconnected the electrical connector on the boost solenoids and leave them disconnected.
I will tell the other people who might want to know.
It was disconnected because we were experiencing at periodic times an over-boost condition"where by the engine reaching the rev-limiter bleeds off all boost for about 2-3 seconds and cuts out 4 cylinders" This happened to me twice during eiminations on the 1-2 shift where I experienced excess tire spin. It wasn't because I thought I would gain boost it was the boost I already had I wanted to keep.
The solenoid still works with vaccume normally.
I had suggested they try this to see if that was what he was experiencing.

As a note: I have notice a 2 lb increase in boost above 4800-5850 rpms-GO FIGURE!!!
Hope this explains it?
Dan

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99.5 Vermillian Red SVT Born on date:
8/24/99 # 2094
N.L.O.C # 461
Common Mods.

BEST et w/ mods to date:
13.41 @ 102.49. on F1's w/1.97 60 ft
13.16 @ 104.78 on M/T E.T's w/1.89 60 ft

 

Here's 2 pics. Quality is poor but you'll be able to spot the switch with these photos.

http://www.zing.com/picture/pddc9207...a/ff53cd2d.jpg
http://www.zing.com/picture/p1d8a120...2/ff53cd30.jpg

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2000 Lightning - Red
Superchip CUX2R7
Airaid Filter
ARE II Hard Cover
2" Aim Drop Shackles
G-Tech
Dual 40 Series Flowmasters
Lightning Hitch Cover
Eaton Inside decal
Keyless Entry Keypad

2001 Lexus IS300


e-mail addr rhampton@mindspring.com

"He who dies with the most toys WINS"




[This message has been edited by ToyMan (edited 10-07-2000).]