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Forum: C4 ZR-1 Technical Postings 3 Hours Ago
Replies: 18
Views: 421
Posted By scorp508
Re: Best sounding cams

Yes, the person who designed the profile told me they were made by Web. The first three pages of the PDF say Intake and are 238-239 at 0.050 now that I'm looking at that line. The last few pages say...
Forum: C4 ZR-1 Technical Postings 4 Hours Ago
Replies: 18
Views: 421
Posted By scorp508
Re: Best sounding cams

This is what I have, no actual cam card.
Forum: C4 ZR-1 Technical Postings 5 Hours Ago
Replies: 18
Views: 421
Posted By scorp508
Re: Best sounding cams

My '94 has custom Web-Cam camshafts designed by a previous owner.

I believe they're roughly the following @ 0.050 lift. Not sure on the LSA.

(Edited per Todd's observations.)

Intake: 238*...
Forum: C4 ZR-1 Technical Postings 8 Hours Ago
Replies: 17
Views: 5,272
Posted By scorp508
Re: Minimum Air Idle Adjustment

It would appear I don't have this table as the only IAC related thing in my XDF is "IAC Position vs. Coolant Temp". My understanding (possibly wrong) is the IAC vs. CTS is only used during Open Loop....
Forum: C4 ZR-1 Technical Postings 1 Day Ago
Replies: 17
Views: 5,272
Posted By scorp508
Re: Minimum Air Idle Adjustment

On a cold start when the desired idle is still 1250 it looks like IAC is at 110.

Once warm and desired idle of 850 the steps are around 30-40.
Forum: C4 ZR-1 Technical Postings 1 Day Ago
Replies: 17
Views: 5,272
Posted By scorp508
Re: Minimum Air Idle Adjustment

Digging up an old thread as I work through some stalling issues when coming to a stop before I go grab a data log. I realize this may be a "it depends" question, but is there a rough number of IAC...
Forum: C4 ZR-1 Technical Postings 3 Days Ago
Replies: 11
Views: 1,981
Posted By scorp508
Thumbs up Re: Driveshaft removal for speedo gear swap. C-Beam out or not?

I finally did this yesterday and phrogs is totally correct. I left the C-beam in and moved it towards the passenger side once unbolted. There was plenty of room to undo the rear strap bolts (I need...
Forum: C4 ZR-1s and ZR-1 Parts For Sale/Wanted 5 Days Ago
Replies: 6
Views: 1,960
Posted By scorp508
Thumbs up Re: Yellow 1991 Corvette ZR-1

Geez, a spin through eBay would have quickly fixed that for them. :)

Beautiful car, good luck with the sale!
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 2
Views: 161
Posted By scorp508
Question How many gallons of gas when at "reserve" marker?

In my '94 I'm noticing when the fuel gauge reaches reserve, I am only able to get about 13.5 gallons of fuel into the tank. What are others seeing? My '87 with the same size tank usually accepts...
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 9
Views: 415
Posted By scorp508
Re: Can?t install spare tire carrier. What?s this in the way?

Mystery solved from a previous owner. :cheers: These were used for mufflers with vacuum actuated valves, but those valves were pinned open, and these parts not removed. I can plug it and remove them.
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 9
Views: 415
Posted By scorp508
Re: Can?t install spare tire carrier. What?s this in the way?

Nope. Many modifications done long ago by previous owners.
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 9
Views: 415
Posted By scorp508
Re: Can?t install spare tire carrier. What?s this in the way?

My 94 FSM shows the same, so later today I'll get her down from the lift and see if that one is missing.
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 9
Views: 415
Posted By scorp508
Re: Can?t install spare tire carrier. What?s this in the way?

My 87 has a much larger vacuum ball on the same position. I'll pop the hood when I have time later and look at the Z.

I didn't even pick up on the fact that the solenoid is disconnected....
Forum: C4 ZR-1s and ZR-1 Parts For Sale/Wanted 1 Week Ago
Replies: 99
Views: 16,843
Posted By scorp508
Re: WANTED: Cam position sensor for LT5

Have we managed to get Auto Funk sorted yet? :)
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 9
Views: 415
Posted By scorp508
Question Can?t install spare tire carrier. What?s this in the way?

Edit: Solved! The car used to have vacuum actuated muffler valves but those were pinned open long ago.
-----

My 94 has no spare tire carrier and no spare tire delete brace. I?m adding a spare...
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 2
Views: 199
Posted By scorp508
Question 1994 Power steering leak. Anything unique to know?

I was under my 94 and noticed there's a healthy amount of gunk under the power steering pump area. Before I go investigating further, is there anything unique/special to the ZR-1 for the power...
Forum: C4 ZR-1 Technical Postings 1 Week Ago
Replies: 3
Views: 257
Posted By scorp508
Thumbs up Re: More BMCB BIN spelunking. A few unknown addresses with changes.

Todd, thank you so much for that insight. I may put these back to stock and see how the car reacts. I have two anomalies I haven't had time to chase yet.


1) When cold it loves to stall when...
Forum: C4 ZR-1 General Postings 1 Week Ago
Replies: 15
Views: 2,044
Posted By scorp508
Re: Hello from the UK! :)

Auto_Funk, did you get your hands on a cam position sensor yet?
Forum: C4 ZR-1 General Postings 1 Week Ago
Replies: 19
Views: 1,543
Posted By scorp508
Re: Aftermarket Head Unit Question

Same here. The blue (with white stripe?) amp wire on my metra harness wire is going to the dark green wire.



Oh, sorry! Yes, that is a big chonky black shielded coax type wire. The car side of...
Forum: C4 ZR-1 General Postings 1 Week Ago
Replies: 19
Views: 1,543
Posted By scorp508
Re: Aftermarket Head Unit Question

A couple lessons from recently installing a similar Pioneer NEX head unit in my '94. I'm going on the assumption a 90 and 94's radio wiring is similar, but the below is based on my '94.

The VSS...
Forum: C4 ZR-1 Technical Postings 2 Weeks Ago
Replies: 3
Views: 257
Posted By scorp508
Post More BMCB BIN spelunking. A few unknown addresses with changes.

Doing a binary comparison on BMCB and the BMCB-based chip in my car at the moment, there's a few differences unaccounted for in the XDF I'm using.

Values below are in hex.

Address / Stock BMCB...
Forum: C4 ZR-1 Technical Postings 2 Weeks Ago
Replies: 39
Views: 2,831
Posted By scorp508
Re: Code 61 with secondary system removed?

Given the above it feels as if "Max Vac kPa to Close" maybe should be something like "Max secondary Vac kPa while port closed" as it appears to be testing the existence of any vacuum while the...
Forum: C4 ZR-1 Technical Postings 2 Weeks Ago
Replies: 39
Views: 2,831
Posted By scorp508
Thumbs up Re: Code 61 with secondary system removed?

Todd, nice work. I didn't look at the flow chart before, but that 3.4kPa does come into play for system diagnosis.
Forum: C4 ZR-1 Technical Postings 2 Weeks Ago
Replies: 39
Views: 2,831
Posted By scorp508
Re: Code 61 with secondary system removed?

I appreciate it, Todd. You're correct I love to learn the ins and outs. With this community being limited in size I worry about the day folks start to disappear and want to suck up as much brain food...
Forum: C4 ZR-1 Technical Postings 2 Weeks Ago
Replies: 39
Views: 2,831
Posted By scorp508
Re: Code 61 with secondary system removed?

Oh I absolutely am, I love details to a fault! :icon_stud In addition to fixing things I love the learning opportunity of tearing things down to their most raw components.



I was in the middle...
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