Secondary Vacuum Solenoid - Page 3 - ZR-1 Net Registry Forums

Jagdpanzer · 08-05-2009

Butler has another LT5 secondary solenoid valve up for auction:

http://cgi.ebay.com/ebaymotors/90-95...=p4506.c0.m245

Paul Workman · 08-05-2009

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.

scottfab · 08-06-2009

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.

jeasen · 08-08-2009

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

lbszr · 08-09-2009

Quote:

Originally Posted by jeasen

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!

jeasen · 08-10-2009

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.

LT5-1935 · 08-10-2009

ACDelco 1997222 Accumulator Assembly Amazon.com $24.67 new

08-05-2009	#21
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,646	Re: Secondary Vacuum Solenoid Butler has another LT5 secondary solenoid valve up for auction: http://cgi.ebay.com/ebaymotors/90-95...=p4506.c0.m245

08-05-2009	#22
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	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.

08-06-2009	#23
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,193	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. __________________ Scott Vett owner since 1979._It's about the car and the people

08-08-2009	#24
jeasen Join Date: Jul 2009 Location: Bonner Springs, Kansas Posts: 34	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

08-10-2009	#26
jeasen Join Date: Jul 2009 Location: Bonner Springs, Kansas Posts: 34	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.

08-10-2009	#27
LT5-1935 Join Date: Jan 2009 Location: KINGSVILLE, MD Posts: 65	Re: Secondary Vacuum Solenoid ACDelco 1997222 Accumulator Assembly Amazon.com $24.67 new