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Search took 0.00 seconds. Search: Posts Made By: POWERBRAKEBOB
Forum: C4 ZR-1 Technical Postings 05-25-2014
Replies: 66
Views: 17,017
Posted By POWERBRAKEBOB
Re: LT5 Ignition Systems Question???

I set a plug out on the engine with wire and cranked. NO spark. NO flash of the noid light. Sec light flashes, then goes out by turning key to ON. Key on, pumps run two seconds. Cleared door alarm. I...
Forum: C4 ZR-1 Technical Postings 05-25-2014
Replies: 66
Views: 17,017
Posted By POWERBRAKEBOB
Re: LT5 Ignition Systems Question???

I'm still chasing this "cranks but won't fire" problem on mine. I have changed the IM, the CPS, tested the harness between CPS and IM, all fuses, tested the ECM and Jet chip, new battery, coils are...
Forum: C4 ZR-1 Technical Postings 04-27-2014
Replies: 16
Views: 2,341
Posted By POWERBRAKEBOB
Re: Brainstorming future brake upgrade

Oh. I felt I was being kicked to the ground here. For reference, Mr. Hal Baer's first "brake invention' was machining a bracket to adapt the 2 piston 1989 Calipers to a Camaro. Mr. William Wood...
Forum: C4 ZR-1 Technical Postings 04-12-2014
Replies: 20
Views: 5,687
Posted By POWERBRAKEBOB
Re: Master Brake Cylinder to Hydroboost with 1" master

My dual dia booster was getting tired finally at 260,000 miles, and so was the Master. I rebuilt it once 15 years ago. In looking at it, I decided that the placement of the computer and wiring was...
Forum: C4 ZR-1 Technical Postings 04-12-2014
Replies: 66
Views: 17,017
Posted By POWERBRAKEBOB
Re: LT5 Ignition Systems Question???

Does anyone know if the MSD DIS-4 box will replace and remove the factory DIS Box?
Forum: C4 ZR-1 Technical Postings 04-09-2014
Replies: 16
Views: 2,341
Posted By POWERBRAKEBOB
Re: Brainstorming future brake upgrade

I have been in the Specialty brake business for 45 years at approx. 80-100 hrs per week. Yes, I DO know brakes. I design, build them and go test them. The bolt pattern on the Australian boosters will...
Forum: C4 ZR-1 Technical Postings 04-09-2014
Replies: 16
Views: 2,341
Posted By POWERBRAKEBOB
Re: Brainstorming future brake upgrade

3384
This is how to fix those brakes. 1" Delco master, same as C-4, with Hydroboost POWER
Forum: C4 ZR-1 Technical Postings 10-14-2013
Replies: 36
Views: 6,379
Posted By POWERBRAKEBOB
Re: Brakes That Will Stop A Freight Train

Those are beauties. However, one of the weaknesses of the C4 brakes is the Australian booster and master. The Dual dia vac booster is a huge improvement over the plastic booster. The problem here is...
Forum: C4 ZR-1 Technical Postings 10-14-2013
Replies: 8
Views: 1,307
Posted By POWERBRAKEBOB
HYDROBOOST INSTALLATION

Hi Gang! I have been dissatisfied with the look of the vacuum booster, and the computer and huge wiring loom plopped on top of the vacuum booster. The master and vac booster were getting tired at...
Forum: C4 ZR-1 Technical Postings 09-07-2013
Replies: 62
Views: 13,032
Posted By POWERBRAKEBOB
Re: The Dreaded No Start

I bought my car new, and had the problem since. I learned more than I ever wanted to know. I found that the PASS Key, after verifying, then tells the F/P relay to start the pump to run for 2...
Forum: C4 ZR-1 General Postings 07-31-2013
Replies: 137
Views: 20,774
Posted By POWERBRAKEBOB
Re: What's the Mileage on your ZR-1(s)?

254,000 miles
Forum: C4 ZR-1 Technical Postings 07-31-2013
Replies: 10
Views: 2,164
Posted By POWERBRAKEBOB
Re: Yun's rear brake upgrade - Part 1

I am sure you will need a larger bore master to feed all those caliper pistons. Unfortunately, larger masters will not bolt on to the original vacuum booster.
I recommend my Hydroboost system,...
Forum: C4 ZR-1 Technical Postings 07-31-2013
Replies: 20
Views: 5,687
Posted By POWERBRAKEBOB
Re: Master Brake Cylinder ?

These are the before photos of the wiring harness and computer wrapped over the vacuum booster. With the Hydroboost, and the battery moved back to the compartment, the harness can be rerouted to...
Forum: C4 ZR-1 Technical Postings 07-30-2013
Replies: 3
Views: 856
Posted By POWERBRAKEBOB
Re: HYDROBOOST POWER BRAKE SYSTEMS.

YES! I have been doing many Turbo Buicks, and they can hold up to 22lbs of boost without Redlighting using the HYDROBOOST. Yes, ALL the forums talk about the junkyard Astrovan units. I started doing...
Forum: C4 ZR-1 Technical Postings 07-30-2013
Replies: 23
Views: 4,296
Posted By POWERBRAKEBOB
Re: air bleed with plenum coolant bypass

I had bypassed the coolant from around the throttle body on mine back in 1990, as I had done on both my 1985 and 1989 cars. I actually showed that trick to Guldstrand when he was at my shop in 1985....
Forum: C4 ZR-1 Technical Postings 07-30-2013
Replies: 20
Views: 5,687
Posted By POWERBRAKEBOB
Re: Master Brake Cylinder ? Hydroboost solution

I have rebuilt many of the C-4 masters, and thousands of the C-2,C3 masters.
In looking at the vacuum boosters on the ZR-1's, I notice how ugly that computer wiring harness is, and how ugly the...
Forum: C4 ZR-1 Technical Postings 07-30-2013
Replies: 3
Views: 856
Posted By POWERBRAKEBOB
HYDROBOOST POWER BRAKE SYSTEMS.

I bought my Turquoise car new. It was originally a Chevrolet Show Car. It now has 254,000 adventurous miles on it. Since it will never be a "showroom stock" car with high value. I have decided to...
Forum: C4 ZR-1 Technical Postings 07-16-2013
Replies: 23
Views: 4,296
Posted By POWERBRAKEBOB
Re: air bleed with plenum coolant bypass

I may be wrong, but it appears to me that the crossover hose set is only brought up to circulate hot water around the throttle body. THAT I bypassed when I bought the car new. I just ran a rubber...
Forum: C4 ZR-1 Technical Postings 07-16-2013
Replies: 20
Views: 5,687
Posted By POWERBRAKEBOB
Re: Master Brake Cylinder ?

IF the master is sucking air in, then there is no venting between the booster and the master. Perhaps someone put sealer in between? They must vent.
I do HYDROBOOST conversions, and can build...
Forum: C4 ZR-1 Technical Postings 07-16-2013
Replies: 33
Views: 2,894
Posted By POWERBRAKEBOB
Re: clutch engagement; early

The clutch master is only 11/16' piston size. The slave is 1 1/16" the small master doesn't have enough volume to operate the clutch slave with enough volume. I'm working on a larger bore master, and...
Forum: C4 ZR-1 Technical Postings 07-15-2013
Replies: 81
Views: 6,487
Posted By POWERBRAKEBOB
Re: Big Brakes Needed HYDROBOOST

The entire premise of the ZR-1 was to be able to bring in a dual pattern camshaft for vacuum and emissions reasons. As you know, it is very complicated to bring in the secondary ports. The L88's had...
Forum: C4 ZR-1 Technical Postings 07-15-2013
Replies: 13
Views: 2,482
Posted By POWERBRAKEBOB
Re: 1990 ZR-1 cranks but won't start

Had this issue for many years, finally, it would not start. I had bypassed the clutch switch years ago. Recently, the pump would not run. I replaced it, no pump running. I replaced all the relays. I...
Forum: C4 ZR-1 Technical Postings 07-15-2013
Replies: 10
Views: 2,109
Posted By POWERBRAKEBOB
Re: Clutch Slave Cyclinder

Bleeding the slave is the simplest thing. Air bubbles only go UP. Fluid only goes DOWN. Usually just filling the master and letting it sit, the slave will bleed. You can also pump, SLOWLY, the fluid...
Forum: C4 ZR-1 Technical Postings 07-15-2013
Replies: 10
Views: 2,109
Posted By POWERBRAKEBOB
Re: Clutch Slave Cyclinder

I'm working on engineering a better clutch master/slave combo. The master is a piddly 11/16" piston. You have to bury the pedal into the carpet every time to shift. Third is always hard to push into....
Forum: C4 ZR-1 Technical Postings 05-29-2013
Replies: 4
Views: 1,593
Posted By POWERBRAKEBOB
Re: "Off the hook" NO start.

Thanks, Scott. I only ran the pumps for a second just to see IF they ran, which they did. I know better than to run the pumps dry. They had NOT been running about half the time since pulling out of...
Showing results 1 to 25 of 38
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