Forum: C4 ZR-1 Technical Postings
01-28-2024
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Replies: 14
Views: 17,166
Re: Horsepower difference ?
"Catalyst reversion"...LOL
More like "catalyst regurgitation."
I don't remember what Graham called it but he did explain that because of lower pressure in the cylinder, the engine sucked pieces...
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Forum: C4 ZR-1 Technical Postings
01-28-2024
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Replies: 19
Views: 16,336
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Forum: C4 ZR-1 Technical Postings
01-28-2024
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Replies: 15
Views: 12,643
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Forum: C4 ZR-1 Technical Postings
01-28-2024
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Replies: 14
Views: 17,166
Re: Horsepower difference ?
Some of that info came from GM press info that was distributed in the 1993 long lead book.
The rest of it came from a conversation I had many years ago with Graham B.
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Forum: C4 ZR-1 Technical Postings
01-20-2024
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Replies: 14
Views: 17,166
Re: Horsepower difference ?
>Mild port/polish on intake and exhaust ports.
>better blending of the ports just above the valve seats
>Three-angle valve seats
>"Sleeve spacer" between the head and injector housings to improve...
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Forum: C4 ZR-1 Technical Postings
01-20-2024
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Replies: 4
Views: 7,890
Re: So Cal ZR-1 Service Shop??
I owned a '95 ZR1 for 20 years. I live in Goleta but used to live in West Covina. I did most of my own service work but would take my car to a Corvette specialty shop sometimes. Sadly, that...
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Forum: C4 ZR-1 Technical Postings
01-18-2024
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Replies: 15
Views: 12,643
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Forum: C4 ZR-1 General Postings
11-21-2023
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Replies: 14
Views: 5,247
Re: ZR1 sitting for 20 years
1) Replace the battery. Clean cable ends if necessary
2) Inspect the fuel tank. Clean/replace as necessary
3) Replace fuel pumps
4) Replace fuel filter
5) Replace injectors
6) Pull the fuel...
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Forum: C4 ZR-1 Technical Postings
02-12-2023
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Replies: 5
Views: 1,964
Re: AGM Battery recomendations
There are few AGM batteries that will bolt right into a C4's battery location. Odyssey used to sell one. In fact, I had one when I owned "Barney" my '95 (SN 00140). Unfortunately EnerSys, parent of...
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Forum: C4 ZR-1 General Postings
09-25-2022
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Replies: 18
Views: 2,466
Re: Tracking down the history of "Ten Penny"
Usually, Street Skinners had ported heads and injector housings and partially ported intake plenums. The TB with the oversize secondaries was on some but not all.
Sorry I can't be of more help.
...
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Forum: C4 ZR-1 Technical Postings
09-18-2022
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Replies: 26
Views: 7,359
Re: 0W40?
Playing the devil's advocate...
LT5s with stock valve train don't need that level of zinc and phosphorous (which was formulated with pushrod valve gear in mind) because the cams act directly on...
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Forum: C4 ZR-1 Technical Postings
09-13-2022
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Replies: 5
Views: 6,091
Re: Wheel Compatibility with GS Brakes
I had '96 GS fronts on "Barney,: the C4 ZR1 I once, owned, for probably 2/3rds of the 20 years I had it.
The GS fronts are modestly stiffer across the "bridge" than were the standard J55 fronts....
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Forum: C4 ZR-1 Technical Postings
09-10-2022
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Replies: 26
Views: 7,359
Re: 0W40?
Thanks for the replies, folks.
For those who use M1, the latest 0W40 is "Mobil One Supercar". Among others, it's the factory fill on C8s w. LT2s. M1 "Supercar" is the 10W40 ESP that was rebranded.
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Forum: C4 ZR-1 Technical Postings
09-07-2022
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Replies: 26
Views: 7,359
0W40?
Starting in 2019, GM changed to a 0W40 engine oil for all Corvette engines except the LT6 which uses a 5W50.
Has anyone tried a 0W40 in the first generation LT5?
I would think that the same...
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Forum: C4 ZR-1 Technical Postings
08-20-2022
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Replies: 3
Views: 7,197
Re: Oil Temp
The analog gauges in a C4 ZR1 are not linear so they are pretty useless when you want to know the exact reading.
Some of the later cars can display oil temp on the digital display. If your...
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Forum: C4 ZR-1 Technical Postings
08-20-2022
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Replies: 2
Views: 6,689
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Forum: C4 ZR-1 General Postings
07-05-2022
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Replies: 14
Views: 2,157
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Forum: C4 ZR-1 Technical Postings
07-05-2022
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Replies: 8
Views: 2,810
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Forum: C4 ZR-1 Technical Postings
05-01-2022
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Replies: 17
Views: 11,908
Re: 1991 ZR1 engine knocking on idle
It's too bad the mic was not down lower closer to the exhaust and also closer to the engine. That is...two different recordings.
I've played that footage a couple of times. Once with the volume as...
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Forum: C4 ZR-1 Technical Postings
04-02-2022
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Replies: 16
Views: 6,022
Re: Dual Steering Damper
I think you are indeed lucky...that you got a set of Nittos that have worked well for you and, lucky you didn't buy Sumitomos.:thumbsup:
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Forum: C4 ZR-1 Technical Postings
04-02-2022
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Replies: 7
Views: 4,042
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Forum: C4 ZR-1s and ZR-1 Parts For Sale/Wanted
03-20-2022
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Replies: 3
Views: 861
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Forum: C4 ZR-1 General Postings
03-18-2022
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Replies: 7
Views: 1,774
Re: LT-5 Press Conference Intro Video
Update:
I spent some time searching the hard drive which has all of my writing work back to about 1985 and found two stories I wrote in 1988, one on the ZR-1 and another on LT5. They were both...
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Forum: C4 ZR-1 Technical Postings
03-16-2022
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Replies: 16
Views: 6,022
Re: Dual Steering Damper
As for Nittos...
They're s**t compared to the Michelin PS2. Only tire worse than a Nitto for a ZR-1 is the Sumitomo.
In fact, until I got on the forum today, I thought the PS2 line had been...
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Forum: C4 ZR-1 Technical Postings
03-16-2022
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Replies: 16
Views: 6,022
Re: Dual Steering Damper
I think I've fix the bump steer issue in the C4 steering system, first before I'd add two steering dampers.
No doubt they "work both ways" in that they'll slow steering response as well as (maybe)...
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