Author Topic: Hydroboost Conversion  (Read 11998 times)

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Offline TURBOPOWERED68

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Re: Hydroboost Conversion
« Reply #15 on: May 18 2014, 10:37:55 AM »
Have you priced that setup? I don't know about you but I have a wife, four children and a mortgage. It didn't even come close to my budget.


That reserve ain't much imo. I have a Suburban and a pickup with that setup. I've had the burb chuck a tensioner pulley and you are in no power steering and no power brake land in a hurry.

I am on the same micro budget boat as you, I chose that picture at random just to show the reserve not the "kit "it self.
I also get that once the belt goes south the brakes follow in a hurry but one more push on the brakes can make a big difference as i personally experienced on my Astro.

Anyways thanks for posting this up as it's coming up on my to do list. Thanks for the pictures and step by step   
Most talk about having thick skin but thats just BS.
This damn attitude of "you didn't listen to us/me now you should burn in hell for it" really sucks.

Offline TexasT

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Re: Hydroboost Conversion
« Reply #16 on: May 19 2014, 02:04:29 PM »
You get as many "pushes" as you want. The brakes don't quit, the power assist quits.
Rich

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Offline TurboCajun

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Re: Hydroboost Conversion
« Reply #17 on: May 19 2014, 11:10:47 PM »
yes the hydro boost in already in the car and I am installing the 87 PS and Reservoir. just wanting to know how to run the lines
85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 60lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 2 1/2 dp, running 22psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline TexasT

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Re: Hydroboost Conversion
« Reply #18 on: May 21 2014, 04:03:35 PM »
So, you are removing a pump that has a pressure and two returns(one from steering box and one from hb unit), right?

I can take more pix of mine but it pretty much runs in a circle(kinda). From the pump it goes to the hb, then from hb down to the steering box(these are pressure lines), then from the steering box to the tee, and from the hb to the tee, then to the reservoir, then from the reservoir to the pump. Your new pump has only a pressure and return right?
Rich

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Offline dyermullet

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Re: Hydroboost Conversion
« Reply #19 on: June 07 2015, 10:28:55 PM »
86-87 cars use a different pump than 84-85.

Here is a general diagram of HB routing I borrowed from pirate 4x4

http://www.pirate4x4.com/tech/billavista/Brakes/

Offline GavinHunyady

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Re: Hydroboost Conversion
« Reply #20 on: July 07 2015, 02:54:13 PM »
Fo those of you that have done the conversion, does the pedal feel dead prior to purging the air from the hydraulic boost circuit? (p/s fluid side)
 
I'm bleeding the brakes prior to starting the engine for the first time with the new hydroboost setup and I hardly have any pedal feel. I was wondering if I should run the p/s pump with a drill motor to purge the air? pedal is super squish

Offline TexasT

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Re: Hydroboost Conversion
« Reply #21 on: July 07 2015, 08:27:42 PM »
I jacked up the front, and with fluid ready we started the engine. We watched the reservoir and added as bubbles came up. We went lock to lock with the sterring, and added more fluid to the reservoir. Then we went lock to lock several more times and added fluid to keep it topped off. When we could go lock to lock on the steering without seeing any bubbles in the reservoir we deemed it bled and moved on to bleeding the brakes.

Bleeding the brakes took a little more effort as my car had sat with a blown head gasket for a decade or so. The brakes had really old fluid so we deemed it necessary to bleed until it came out clear fluid and essentially flushed the system. We started with the pass rear but there was so much crud it kept stopping up the bleeder. I removed the bleeder several times to clean it out, but eventually we got clear fluid and were able to move on to the driver rear. You must make sure to keep the master cylinder topped off. It isn't rocket science but there are things that must be adhered to or you must start over when you run the system dry and I think many don't and end up with a spongy pedal and air in the system.
Rich

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Offline GavinHunyady

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Re: Hydroboost Conversion
« Reply #22 on: July 08 2015, 09:32:45 AM »
my point is that I havent started the engine (for the first time) yet... so I'm trying to bleed the brakes and the pedal feels totally dead. I cant imagine that there is that much air in the system and I'm getting clear fluid with no air at the wheel cylinders.

Offline TexasT

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Re: Hydroboost Conversion
« Reply #23 on: July 08 2015, 10:41:08 PM »
Ill push my pedal in the am and see what it feels like. If you are getting fluid with no bubbles I would think it is bled. When are You planning to bust off the new engine?
Rich

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Offline GavinHunyady

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Re: Hydroboost Conversion
« Reply #24 on: July 08 2015, 11:01:58 PM »
within the next week, racing Friday and Saturday with the sprint car, so no GN work for a couple nights. I have about 1 more day of wiring and getting the WB02 installed. After that we should be good for a fire, break-in and leak check. Still need to fab an exhaust and get the alky pump rebuilt/replaced and if all goes well it should be time to tune before the employee car show on the 24th.

Offline TexasT

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Re: Hydroboost Conversion
« Reply #25 on: September 13 2018, 05:36:38 PM »
All right.


It appears as the master cylinder has or is failing. I knew it wasn't in good shape as it would do magic when cold out and make fluid disappear. Today we got the "red car" out and had to move the T to do it.


I hadn't driven it since replacing the front hoses and bleeding the system. Not sure, as I could have air in the system but I don't think so. I will admit we only bled the front but with the spongy pedal and it goes pretty much to the floor I'm leaning towards the mc.


MC not hard to swap. what I'm having trouble swallowing is the price of said MC. I put the cardone type 10-1740 on when I did this conversion but it seems these are NLA. I can find the listings with a web search but none seem to be actually available to order. So on to another search.


I did the search up for the Cadillac again and the rockauto.com comes with a different number but it looks real similar, well, except the price. Which is like 2.5 times more and about $62 shipped. OUCH!
Oh well, that is the price of stopping, so I am in in the next few weeks.
https://www.rockauto.com/en/moreinfo.php?pk=309537&cc=1025996&jsn=1286
An up side is the thing looks like it doesn't use a retaining clip with the "eyes" that got in the way on the last MC I tried.


The results can be seen in the pic. That clip is suppose to be flat and hold the guts of the mc in. The HB unit got caught on the clip and bent it something fierce. Oh and that is my GS in the back ground(brown with the white top), yes, it really does exist, haha.
Rich

"Goals without actions are just dreams."


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