Forum: C4 ZR-1 Technical Postings
1 Week Ago
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Replies: 10
Views: 889
Re: Looking for Oxygen sensors for my engine
I use AC/Delco O2s when I can find them. Haven?t tried Denso and have found that Bosch O2s have a tendency to drop signal intermittently resulting in ECM using Open Loop at times.
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Forum: C4 ZR-1 Technical Postings
03-02-2025
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Replies: 13
Views: 8,403
Re: 1990 no start issue
Yep. Exactly what I did. I still depress the clutch to start the car altho don?t need to. Just in case I overlooked putting trans in Neutral.
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Forum: C4 ZR-1 Technical Postings
03-02-2025
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Replies: 13
Views: 8,403
Re: 1990 no start issue
My clutch switch has been permanently bypassed for 14yrs. I swapped one of those babies out on my 84 when I was much younger and flexible. Ain?t no way u can pretzel yourself under there these days.
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Forum: C4 ZR-1 Technical Postings
02-13-2025
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Replies: 22
Views: 9,769
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Forum: C4 ZR-1 Technical Postings
02-11-2025
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Replies: 22
Views: 9,769
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Forum: C4 ZR-1 General Postings
01-17-2025
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Replies: 8
Views: 1,014
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Forum: C4 ZR-1 General Postings
01-05-2025
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Replies: 16
Views: 5,851
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Forum: C4 ZR-1 Technical Postings
12-08-2024
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Replies: 18
Views: 12,754
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Forum: C4 ZR-1 Technical Postings
12-01-2024
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Replies: 17
Views: 3,445
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Forum: C4 ZR-1 General Postings
11-22-2024
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Replies: 14
Views: 3,188
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Forum: C4 ZR-1 General Postings
11-18-2024
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Replies: 15
Views: 2,813
Re: I really want a C8
The C4 ZR is raw which is so fun to drive. You get the mechanical noises and a direct connection to driving. If I could I?d love to have both.
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Forum: C4 ZR-1 General Postings
11-17-2024
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Replies: 15
Views: 2,813
Re: I really want a C8
True Karl. Perhaps I can hang on long enough to snag one in a few years used.
Bob,
The C8 Z has more hp than the C7Z and is naturally aspirated as u know. No way I?ll ever see a C8 ZR1 unless I...
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Forum: C4 ZR-1 General Postings
11-17-2024
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Replies: 15
Views: 2,813
Re: I really want a C8
I?m totally w u. If its a C8, it needs to be the Z06. Been waiting for a mid engine Vette for over 50 yrs. They finally come out w one and make it pretty much unaffordable. I wouldn?t get the...
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Forum: C4 ZR-1 Technical Postings
11-08-2024
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Replies: 23
Views: 8,342
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Forum: C4 ZR-1 Technical Postings
11-07-2024
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Replies: 23
Views: 8,342
Re: I think I?m in deep 💩
Jeff, does ur reprogramming also allow changing the black on orange to white on black for the LCD display?
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Forum: C4 ZR-1 Technical Postings
11-04-2024
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Replies: 28
Views: 6,662
Re: High/Hanging Idle
Sounds too inconsistent to be a vacuum leak. Sounds to me that as soon as u stab the throttle that?s when it occurs, then quite possibly the movement of the throttle is what brings on the high idle....
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Forum: C4 ZR-1 Technical Postings
11-01-2024
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Replies: 28
Views: 6,662
Re: High/Hanging Idle
One other issue to look for is if the throttle return spring is weak. It won?t bring the TB back to nominal position and cause a high idle. Had that issue several years ago altho if I blipped...
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Forum: C4 ZR-1 Technical Postings
10-07-2024
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Replies: 32
Views: 12,588
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Forum: C4 ZR-1 Technical Postings
10-04-2024
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Replies: 1
Views: 3,861
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Forum: C4 ZR-1 Technical Postings
09-19-2024
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Replies: 5
Views: 5,875
Re: 90 stalling issue solved
Varying the vacuum at the FPR varies the fuel pressure. I used this approach on my 84 Xfire so as to be able to use TBI injectors large enough to feed a modified motor at WOT and yet idle properly....
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Forum: C4 ZR-1 Technical Postings
08-27-2024
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Replies: 8
Views: 9,132
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Forum: C4 ZR-1 Technical Postings
07-30-2024
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Replies: 23
Views: 35,501
Re: Minimum Air Idle Adjustment
So looks like u should open TB a bit further which then would require fewer IAC steps for idle.
Again, make sure u re-check TPS v whenever u change TB opening.
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Forum: C4 ZR-1 Technical Postings
07-30-2024
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Replies: 23
Views: 35,501
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Forum: C4 ZR-1 Technical Postings
07-30-2024
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Replies: 22
Views: 25,669
Re: Challenges setting minimum idle air.
The way to set the IAC is after u have it idling just below ur desired idle, say ALMOST stalling, IOW once u have set ur idle just below where u actually want it, connect everything, restart w diag...
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Forum: C4 ZR-1 Technical Postings
07-30-2024
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Replies: 22
Views: 25,669
Re: Challenges setting minimum idle air.
Mine is ported and cammed as well. U want to set the idle rpm just below where u want it to idle normally so that the IAC will intervene and keep it from stalling out. My motor idles somewhere around...
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