Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 22
Views: 1,522
Re: Continuing angst... headers today...
You are referring to a posting from a six years ago. The current version, made in the past four years or so, of Stainless Works headers does not interfere with the steering shaft. They currently make...
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Forum: C4 ZR-1 Technical Postings
06-27-2022
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Replies: 6
Views: 512
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Forum: C4 ZR-1 Technical Postings
04-03-2022
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Replies: 7
Views: 774
Re: What spark plug wires are these?
They are solid core wires. I recall that several sets were installed in a hotel parking lot at a BG Gathering in about 2005. Non-resistor BRU sparkplugs were also installed. The combination caused...
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Forum: C4 ZR-1 Technical Postings
09-12-2021
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Replies: 60
Views: 6,946
Re: New 3" Exhaust Installation
It's easy to control the valves with an RPM switch. Use Summit Racing PN SUM-830453. $50. Connect it to the B&B vacuum solenoid. Then you can set it to automatically open the valves at, let's say...
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Forum: C4 ZR-1 Technical Postings
08-09-2021
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Replies: 13
Views: 1,056
Re: DIC Bulb Location
The 'ABS Active' indication was first implemented in '91. It will turn on for a second during the pump self test when the car goes to about 8 mph following key on. In '91 a relay was added to drive...
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Forum: C4 ZR-1 Technical Postings
07-11-2021
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Replies: 33
Views: 2,818
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Forum: C4 ZR-1 Technical Postings
06-05-2021
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Replies: 7
Views: 471
Re: AC compressor question
Grounding pin C16 on the ECM will directly activate the compressor clutch relay. If the compressor runs, your problem is that the ECM is not receiving an "AC Request" signal.
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Forum: C4 ZR-1 Technical Postings
05-22-2021
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Replies: 8
Views: 5,430
Re: Diff fluid change
The C4 Corvette service manual does not specify a lubricant change interval for the differential.
Debris gets shed into the lubricant during the break-in period. I like to replace the lubricant...
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Forum: C4 ZR-1 Technical Postings
04-05-2021
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Replies: 10
Views: 1,168
Re: corsa exhaust
I'm not sure, but I believe that the right side flange was eliminated at the '92 1/2 model year point.
In my opinion, GM used the low restriction mufflers that they developed for the '92 LT1 as...
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Forum: C4 ZR-1 Technical Postings
04-04-2021
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Replies: 10
Views: 1,168
Re: corsa exhaust
'90 - '95 has a ball fitting on the left side.
'90 - '92 has a three bolt flange with a gasket on the right side.
'93 - '95 has a 2 3/4" slip fit on the right side.
A '93 - '95 exhaust system...
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Forum: C4 ZR-1 Technical Postings
03-28-2021
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Replies: 13
Views: 845
Re: Brake pump
In the US the Dorman master cylinder is available at RockAuto.com. I know that recently a ZR-1 owner in France was able to get parts from Rock Auto. Hopefully you can.
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Forum: C4 ZR-1 Technical Postings
03-27-2021
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Replies: 13
Views: 845
Re: Brake pump
Hi,
I have seen this several times. The master cylinder can transfer fluid from the front reservoir to the rear reservoir when there is an internal leak in the cylinder.
For replacement we use...
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Forum: C4 ZR-1 Technical Postings
03-14-2021
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Replies: 7
Views: 883
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Forum: C4 ZR-1 Technical Postings
02-15-2021
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Replies: 7
Views: 883
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Forum: C4 ZR-1 Technical Postings
02-14-2021
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Replies: 7
Views: 883
Re: Ecklers speedometer module - help needed
Hi Matt,
I like to locate the electronic module inside the car where the environment is nice.
Cut the yellow wire going to pin A6 on the ECM. Connect the wire from the harness to the...
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Forum: C4 ZR-1 Technical Postings
01-03-2021
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Replies: 8
Views: 1,048
Re: What causes battery drain?
The Viper alarm may draw current full time, even when not armed.
I have removed three Lo-Jack batteries that were causing a full time car battery drain. When the gel-cell back-up battery gets old...
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Forum: C4 ZR-1 Technical Postings
12-15-2020
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Replies: 25
Views: 1,519
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Forum: C4 ZR-1 Technical Postings
12-14-2020
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Replies: 25
Views: 1,519
Re: back cut large valves or not? on a 402 CID..
An LPE Titanium valve spring retainer weighs 10 grams. The OE steel retainer weighs 19 grams.
The spark and fuel tables end at 7000 rpm. The last datum in the table applies from 7000 to 7500 rpm....
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Forum: C4 ZR-1 Technical Postings
12-13-2020
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Replies: 25
Views: 1,519
Re: back cut large valves or not? on a 402 CID..
We also added power to the engine so that it did accelerate faster. What the lighter lifters contributed was mixed into the overall results.
LPE was a major supplier of Titanium retainers. They...
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Forum: C4 ZR-1 Technical Postings
12-12-2020
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Replies: 25
Views: 1,519
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Forum: C4 ZR-1 Technical Postings
12-07-2020
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Replies: 25
Views: 1,519
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Forum: C4 ZR-1 Technical Postings
12-06-2020
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Replies: 5
Views: 677
Re: Speedo not working
The most common cause for the speedometer to read zero is an open coil in the sensor. Unplug the sensor and measure the resistance at the pins. It should be about 500 ohms. If you measure infinity,...
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Forum: C4 ZR-1 Technical Postings
11-02-2020
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Replies: 21
Views: 1,636
Re: Iridium Plugs
Denso has recently released a spark plug that is specifically designed for wasted spark ignitions. It has a platinum tipped negative electrode. This addresses the erosion issue associated with the...
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Forum: C4 ZR-1 Technical Postings
10-21-2020
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Replies: 11
Views: 1,235
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Forum: C4 ZR-1 Technical Postings
10-20-2020
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Replies: 11
Views: 1,235
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