Secondary Vacuum Solenoid

[jeasen]

I got busy at work and was not able to check back until now. After reading the posts in regards to bypassing the vacuum system I decided I would buy the vacuum solenoid that was listed on Ebay.

However, when I went to buy it it was already sold.

I did not like the idea about losing torque. Torque is important to me that is why I have turbo Buicks and drive a diesel pickup.

Does anyone know about the other replacement solenoids that was mentioned? In the mean time I am going to see if I can my solenoid working.

I want to thank everyone again for their help.

[secondchance]

Originally Posted by jeasen

I got busy at work and was not able to check back until now. After reading the posts in regards to bypassing the vacuum system I decided I would buy the vacuum solenoid that was listed on Ebay.

However, when I went to buy it it was already sold.

I did not like the idea about losing torque. Torque is important to me that is why I have turbo Buicks and drive a diesel pickup.

Does anyone know about the other replacement solenoids that was mentioned? In the mean time I am going to see if I can my solenoid working.

I want to thank everyone again for their help.

That is just my thought based on my understanding. Others may have different opinion.

More expensive but worst case scenario - http://www.whiteracingproducts.com/i...roducts_id=279

[lbszr]

Originally Posted by jeasen

I got busy at work and was not able to check back until now. After reading the posts in regards to bypassing the vacuum system I decided I would buy the vacuum solenoid that was listed on Ebay.

However, when I went to buy it it was already sold.

I did not like the idea about losing torque. Torque is important to me that is why I have turbo Buicks and drive a diesel pickup.

Does anyone know about the other replacement solenoids that was mentioned? In the mean time I am going to see if I can my solenoid working.

I want to thank everyone again for their help.

I thought rock auto or auto zone listed the solonoid at one one time but couldn't find it now.

If you still are thinking about deactivating them Marc Haibeck could give you the different options and burn the chip. Mine are deactivated but still require the solonoid to be electrically connected, so if yours is broke electrically you still might have a problem. Marc might have a way completely disconnect the solonoid by now though maybe.

I've heard torque loss is about 10lbs. But I can't feel it. With a stock chip and a vacum guage T'd in while driving around mine opened before 2000 before deactivating. Good Luck.

[Pete]

Tthe secondaries are open anytime you go WOT no matter what RPM.

Also about loosing low end torque if you do it's very little to none.

Does anybody have a before and after Dyno #'s.

My experience with removing secondaries with huge ported intake ports drive's better from a stop.
It feels like i cranked the timing.
My throttle response is amazing i would go as far as to say it's better then stock.

Ask those who have removed them the rest is theories.

Trust me if my Z coughed sputtered or lost power i'd put them back on
in a heartbeat.

Pete

[LGAFF]

Guys at GM apparently did not think the secondaries were that important, look what they did with Snakeskinner, no secondaries! That car set the fastest 0-100-0 of any modern car tested at that time.

[XfireZ51]

Completely agree with Pete here. At least from my experience I have not felt or measured any loss of low end torque. My setup has ported plenum and matched head ports with throttle plates removed. With street tires it is difficult to leave from the line at anything higher than idle without spining the tires. They also break loose from a roll in second at 15-1600 rpm. IMO, secondaries were there for the valet key more than low end torque. Having said that, tuning is a prereq to optimize for it.

Originally Posted by Pete

Tthe secondaries are open anytime you go WOT no matter what RPM.

Also about loosing low end torque if you do it's very little to none.

Does anybody have a before and after Dyno #'s.

My experience with removing secondaries with huge ported intake ports drive's better from a stop.
It feels like i cranked the timing.
My throttle response is amazing i would go as far as to say it's better then stock.

Ask those who have removed them the rest is theories.

Trust me if my Z coughed sputtered or lost power i'd put them back on
in a heartbeat.

Pete

[John Boothby]

Originally Posted by jeasen

I got busy at work and was not able to check back until now. After reading the posts in regards to bypassing the vacuum system I decided I would buy the vacuum solenoid that was listed on Ebay.

However, when I went to buy it it was already sold.

I did not like the idea about losing torque. Torque is important to me that is why I have turbo Buicks and drive a diesel pickup.

Does anyone know about the other replacement solenoids that was mentioned? In the mean time I am going to see if I can my solenoid working.

I want to thank everyone again for their help.

Jeasen, I have a spare solenoid if you want it. It is used, but I believe still works properly. I removed it a couple of months ago when I replaced my entire secondary vac system.

PM me if interested. Just pay shipping.

[jeasen]

John Boothby, PM sent.

[billybaloneey]

Jeason,

Jim Butler Chevy, in St. Louis MO, places what you need on eBay from time to time...they have some up for auction now...or you might just contact them directly.

[John Boothby]

I also have a brand new secondary solenoid GM pn: 1997201 for a 91-95 ZR-1. This part came in a kit ordered from White Racing a couple of months ago. He included two solenoids, one for the 90 and one for 91-95. Since I have a 90 I do not need the 91-95 solenoid. I am only selling on this forum. A brother's price is what is on the box: $38.17 plus shipping.