Forum: C4 ZR-1 Technical Postings
13 Hours Ago
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Replies: 5
Views: 253
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
3 Weeks Ago
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Replies: 8
Views: 2,177
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Forum: C4 ZR-1 Technical Postings
07-30-2024
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Replies: 23
Views: 11,441
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: 11,441
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Forum: C4 ZR-1 Technical Postings
07-30-2024
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Replies: 22
Views: 6,885
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: 6,885
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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Forum: C4 ZR-1 Technical Postings
07-29-2024
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Replies: 22
Views: 6,885
Re: Challenges setting minimum idle air.
If u datalog, I use ALDLdroid, connect everything up and then scan w ignition ON but no engine start, see what the IAC STEPS are. Should be 155 if fully extended. Before datalogging, I usually go...
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Forum: C4 ZR-1 Technical Postings
07-22-2024
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Replies: 7
Views: 1,607
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Forum: C4 ZR-1 Technical Postings
07-20-2024
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Replies: 68
Views: 10,793
Re: LT5 ECM Tuning thread
Grumpy(aka Bruce Plecan) passed away quite a long time ago. We held a tuning symposium in his honor near his home in Ohio. He and RBob were the brains behind a great deal of the tuning knowledge we...
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Forum: C4 ZR-1 Technical Postings
07-15-2024
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Replies: 8
Views: 1,290
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Forum: C4 ZR-1 Technical Postings
07-13-2024
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Replies: 4
Views: 3,290
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Forum: C4 ZR-1 Technical Postings
07-12-2024
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Replies: 4
Views: 3,290
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Forum: C4 ZR-1 Technical Postings
07-05-2024
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Replies: 12
Views: 3,859
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Forum: C4 ZR-1 Technical Postings
07-05-2024
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Replies: 12
Views: 3,859
Re: ADS Superchip
ADS is an old calibration. The fact that the fans run on START makes me suspect the checksum is disabled. That?s something that had been done in the early days. I would get a stock prom for the...
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Forum: C4 ZR-1 Technical Postings
07-03-2024
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Replies: 22
Views: 6,885
Re: Challenges setting minimum idle air.
When u connect ALDL, turn ignition ON, how many steps are showing for the IAC using ur datalogger?
One other thing to try is take IAC OUT and plug IAC port to seal it. Make sure the IAC IS UNPLUGGED...
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Forum: C4 ZR-1 Technical Postings
07-03-2024
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Replies: 22
Views: 6,885
Re: Challenges setting minimum idle air.
I unplug IAC w Ignition ON but not started. Then go back and turn OFF ignition. I do use my datalogger to check RPM. U should turn throttle set screw until idle is slightly lower than the desired...
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Forum: C4 ZR-1 Technical Postings
07-03-2024
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Replies: 22
Views: 6,885
Re: Challenges setting minimum idle air.
Did u plug in ALDL, TURN IGNITION ON, then unplug IAC first? The. Unplug ALDL B4 turn off ignition? This closes off IAC port.
Also, throttle blade closes as u back out set screw. At 60 counts, most...
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Forum: C4 ZR-1 Technical Postings
06-24-2024
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Replies: 19
Views: 6,748
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Forum: C4 ZR-1 Technical Postings
06-24-2024
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Replies: 23
Views: 11,441
Re: Minimum Air Idle Adjustment
U want enough IAC steps so ECM has room to ?catch? idle drop, but not too many steps to where most of idle air is coming thru IAC opening. I typically shoot for 10-15 steps. One other step I do is to...
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Forum: C4 ZR-1 Technical Postings
06-23-2024
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Replies: 19
Views: 6,748
Re: Best sounding cams
Yes it is. The video was b4 tuning. Makes u think of what GM could have done continuing to develop that platform. Its the way it should have come from the factory.
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Forum: C4 ZR-1 Technical Postings
06-23-2024
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Replies: 19
Views: 6,748
Re: Best sounding cams
The sound of a cammed SBC is due to the necessity for high lift/ long duration to get the breathing. 4 valves do that for the LT5, so cam profile can be relatively mild in comparison for similar or...
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Forum: C4 ZR-1 Technical Postings
06-19-2024
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Replies: 19
Views: 6,748
Re: Best sounding cams
Stage 1 Dr. Greekenstein cams, fully ported, headers, Xpipe, Magnaflow muffs w C6 Z06 NPP valves.
https://youtu.be/LYgBSTyLd9I?si=MGVLn-aDQA3kmJEn
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Forum: C4 ZR-1 General Postings
06-06-2024
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Replies: 19
Views: 6,611
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Forum: C4 ZR-1 Technical Postings
06-06-2024
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Replies: 39
Views: 12,399
Re: Code 61 with secondary system removed?
I believe u are way ?overthinking? this. If ur objective is to keep the secondaries open in all conditions except idle and decel, then what was sent is what is working for many users. U will likely...
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Forum: C4 ZR-1 Technical Postings
06-06-2024
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Replies: 39
Views: 12,399
Re: Code 61 with secondary system removed?
Here's the conversion formula in the .xdf I have w the values calc'd from a stock $F0 BKKR bin. That's the conversion formula in the .xdf I sent you Brian.
The 10 and 104 value are what Haibeck uses...
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