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Old 08-05-2009   #21
Jagdpanzer
 
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Join Date: Apr 2007
Location: Northern VA
Posts: 2,646
Default Re: Secondary Vacuum Solenoid

Butler has another LT5 secondary solenoid valve up for auction:



http://cgi.ebay.com/ebaymotors/90-95...=p4506.c0.m245
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Old 08-05-2009   #22
Paul Workman
 
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Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
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Default Removing secondaries = great!

I'll add my dittos to pulling the secondaries. If there is a loss of torque, I am oblivious. This is partly b/c I pulled the secondary hardware entirely as part of a top-end porting project. Like Dominick (and others with similar mods)...the damn tires have lots of trouble sticking in first OR second gear!

As for normal driving, I have to say it is better than stock. Like Pete mentioned, I love the new throttle response too. FWIW, the prototype 475 hp LT5 that was intended for the 95 MY, and later sidelined before it went into production, scrapped the dual runner bit all together; AND GM went with a single injector! I couldn't say whether the fact that so many have had superb results by siamesing part or all of the twin runners had any influence on the 475 hp LT5's intake system, but one can't help but see the similarities!

Secondaries: Parts that don't exist, seldom break. And! They don't cost much!

P.
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Old 08-06-2009   #23
scottfab
 
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Location: Portland Oregon metro area (Washington side)
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Default Re: Secondary Vacuum Solenoid

Occasionally I have to let someone else drive my car. I chose to leave the secondary design in place so I can put the car in valet mode and take the key out. I also have an electrical actuator for the secondaries that I put together 7 yrs ago. The plan was to replace the vacuum system the next time it failed or I had to get under the plenum. Problem is, the vacuum system has not failed again.
But if I do mod the secondaries I will save all part (as I did with the exhaust). If I ever sell the car and the new owner wants to, the car can be made to be stock again.
Who knows, maybe the new owner would want to carve out the dash for a new sound system, chop the top down and put flames on the side. But the option for returning to stock will be possible.
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Vett owner since 1979._It's about the car and the people
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Old 08-08-2009   #24
jeasen
 
Join Date: Jul 2009
Location: Bonner Springs, Kansas
Posts: 34
Default Re: Secondary Vacuum Solenoid

First I want to thank everyone for theire replies and help in regards to my post. I tied the secondaries open and put the plenum back on and doubled checked to make sure everything was connected and in place. After I refilled the cooling system I got in and tried to start it up. And guess what! The car would not start. It turned over but would not start.
My first thought was that I must have not got one of the electrical connections plugged into the ignition module correctly. So I quit working on the car and went into the house to contemplate. After thinking about the car not starting for a while I decided to check the fuses. Sure enough, the one marked instr was blown. I must of did this when I was trying to check out the vacuum solenoid.
I picked up some fuses yesterday and put a new fuse in and the car started right up.
I drove it around quite a bit today and I now know what full power feels like. The car pulls really hard above 4000 RPMs and revs to red line without a problem.
All I can say is that I am impressed.
Thanks again everyone for all your help and comments.
Jeasen
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Old 08-09-2009   #25
lbszr
 
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Location: dayton,ohio
Posts: 424
Default Re: Secondary Vacuum Solenoid

Quote:
Originally Posted by jeasen View Post
First I want to thank everyone for theire replies and help in regards to my post. I tied the secondaries open and put the plenum back on and doubled checked to make sure everything was connected and in place. After I refilled the cooling system I got in and tried to start it up. And guess what! The car would not start. It turned over but would not start.
My first thought was that I must have not got one of the electrical connections plugged into the ignition module correctly. So I quit working on the car and went into the house to contemplate. After thinking about the car not starting for a while I decided to check the fuses. Sure enough, the one marked instr was blown. I must of did this when I was trying to check out the vacuum solenoid.
I picked up some fuses yesterday and put a new fuse in and the car started right up.
I drove it around quite a bit today and I now know what full power feels like. The car pulls really hard above 4000 RPMs and revs to red line without a problem.
All I can say is that I am impressed.
Thanks again everyone for all your help and comments.
Jeasen
Glad to hear you felt the lt5. Did you burn a new chip? It might need the sec inj. on sooner if not , could be more poewer to be had!
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Old 08-10-2009   #26
jeasen
 
Join Date: Jul 2009
Location: Bonner Springs, Kansas
Posts: 34
Default Re: Secondary Vacuum Solenoid

No, it is the same chip. I can not give you an idea of the difference. The secondaries never worked since I started driving the car a couple of weeks ago.

I have nothing to compare it to, but it would be my guess that the vacuum operated secondaries would be a smoother transition between normal and full power.
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Old 08-10-2009   #27
LT5-1935
 
Join Date: Jan 2009
Location: KINGSVILLE, MD
Posts: 65
Default Re: Secondary Vacuum Solenoid

ACDelco 1997222 Accumulator Assembly Amazon.com $24.67 new
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