12-10-2013 | #21 | |
Join Date: Oct 2004
Posts: 1,889
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Re: Speed at WOT ?
Quote:
In the FSM it should be found 1C1-1 through 1C1-5 for the '90 and for other years on similarly numbered pages I'd think. |
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12-11-2013 | #22 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Speed at WOT ?
Quote:
The bigger tach error is due to mechanical lagging as a function of rapidly increasing rpm - especially in low gear at WOT. (So, a lot could be said for the original C4 digital tach displays, far as mechanical lag (the lack thereof) goes.) So, obviously the shift light is a far more accurate (and maybe safer) way to avoid analog errors when rowing the gears. P.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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12-11-2013 | #23 | |
Join Date: May 2013
Location: France
Posts: 55
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Re: Speed at WOT ?
Quote:
if you can send it to me, it would be really nice does 4.10 gear ration came stock out of the factory in '90 ? |
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12-11-2013 | #24 |
Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,170
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Re: Speed at WOT ?
1990 - 1996: HVAC Diagnostic Codes
On 1990 to 1996 Corvettes equipped with RPO C68 (electronic climate control), it is possible to read the HVAC system diagnostic codes from the climate control panel on the dashboard. 1. To enter the diagnostic mode, press the fan up and down arrow buttons at the same time until -00 appears on the digital readout. 2. One you have entered the diagnostic mode, you can scroll through the various parameters by using the up and down fan buttons. 3. To view the value for a particular parameter, press the "AUTO" fan button. Note: If you see a "-" next to a parameter value (example: "-105"), you must add "100" to that value to obtain the correct value for that parameter. Therefore, the correct reading would be 205 for this example. Parameter Description Values 0 System Faults (one of these will be set if your air conditioning controls have an LED flashing) 00=No Faults 01= Temp Door Motor Circuit Fault 02= Temp Door Motor Circuit Fault 03 = Ambient Sensor Open 04 = Ambient Sensor Short 05 = In-Vehicle Temp Sensor Open 06 = In-Vehicle Temp Sensor Short 07 = Solar Load Sensor Open 08 = Solar Load Sensor Short 09 = Low Freon Detected 10 = UART Failure 1 Temp Setting 60F to 90F 2 In-Car Temp Sensor 10 = HOT -130 = 230 = COLD 3 Outside Temp Sensor 10 = HOT -130 = 230 = COLD 4 Sun Load Sensor Max light Max Dark L98 38 183 LT5 115 -110 = 210 5 Ignition System Voltage 0 = 9 Volts -155 = 255 = 16 V 6 Engine Speed (RPM divided by 25) 7 Vehicle Speed 9 A/C System Mode 00 = OFF 01 = Re-Circulation 02 = A/C 03 = Bi-Level 04 = Heater 06 = Defrost 07 = Vent 10 = Manual Re-Circulation 10 Blower PWM 0 = 0 Volts 128 = 14 Volts 11 Program Number 00 = COLD -155 = 255 = HOT 12 Mix Number -155 = 255 = COLD 00 = COLD 16 Coolant Temperature In degrees C 17 Solar Correction 114 = Max light 128 = max dark 30 Stored Full Hot Value 0 to 50 31 Temp Door Travel Range 100 to 200 34 Temp Door Position Requested 00=Full HOT -153=253=Full COLD 35 Compressor On Time 0.1 second increments 36 Number Of Times Below Critical Time 37 Software Version Number |
12-11-2013 | #25 |
Join Date: Oct 2004
Posts: 1,889
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Re: Speed at WOT ?
The 4.10 ratio doesn't come from the factory for any year C4 Corvette
It looks like "We Gone" has you covered on the C68 diagnostic and information procedure. If you've other questions you can see the answers are generally just minutes away. The tach error when you confirm that is what it is won't be a difficult repair for you either. There are multiple DIY threads available for that. |
12-11-2013 | #26 | |
Join Date: May 2013
Location: France
Posts: 55
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Re: Speed at WOT ?
Quote:
thanks again everyone for your reactivity |
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12-11-2013 | #27 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,698
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Re: Speed at WOT ?
Quote:
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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12-16-2013 | #28 |
Join Date: May 2013
Location: France
Posts: 55
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Re: Speed at WOT ?
ive made a quick test this we
at 2000rpm on the tach, correspond 66 on the A/C : 1650rpm at 3000rpm, 108 : 2700 rpm at 4000rpm, 140 : 3500 rpm this is approx because i've made the test alone and it was hard to look at the tach, look at the A/C, maintain the rpm and look at the road i will make other test another time and keep you informed |
12-16-2013 | #29 |
Join Date: Oct 2004
Posts: 1,889
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Re: Speed at WOT ?
I'd say you've confirmed the tachometer error and unlike a speedometer error it's not going to be at a "fixed percentage". Did you happen to make an observation "at idle"? Maybe now that an error is suspect it would be motivation to find a scanner and do it again using the ALDL as a source.
How responsive did the A/C display appear to be to your application of throttle? Considerable lag or maybe rather responsive. I've never actually used it. |
12-17-2013 | #30 |
Join Date: May 2013
Location: France
Posts: 55
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Re: Speed at WOT ?
at idle it was between 28 & 32 : 700/800 rpm
the A/C display is not immediately responsive but not that much laggy also Last edited by DarkAngel; 12-17-2013 at 09:46 AM. |
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