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Thread: Things I learned today about 14CUX V8

  1. 19th August 2007, 03:43 PM #1
    PhilipA
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    Things I learned today about 14CUX V8

    I wanted to have a look at the tuning of my 92 Range Rover before I start adding o2 sensors . my economy has been bad for a while at 22lper100Km around town

    I got out my trusty old vacuum gauge, voltmeter, colortune and timing light. Sort of stone age.

    To recap, my car has Unichip, Thor manifold , modded heads, Bosch 4 hole injectors,free flow exhaust.

    Lesson 1 is that the mixtures were good. Nice and blue on the old Colortune.
    Anyway, I fitted up the vacuum gauge and started turning the pot on the AFM to get maximum vacuum. The setting was vastly different at 1.4 volts, than the setting it was on, about 0.6 volts.

    Lesson 2 is that I disconnected the AFM, and the car kept going on limp home, which showed MUCH richer on the colortune. However if reattached the car remained in limp home mode( as indicated by the rich mixture), and did not reset until I disconnected the battery.
    So all of you who found no difference when you reattached the AFM and then went and bought a new one, maybe should have reset the ECU before assuming the AFM was dead.
    Lesson 3 is that I then checked the timing, and found that when revving the motor, it only advanced with centrifugal advance. Now I do know if the unichip is smart enough to only "vacuum" advance when moving But I suspect not. To recap . The major gains from a Unichip are from a revised electronic"vacuum" advance curve, and also he major expense as you have to buy a new amplifier which costs a motza.
    I will be calling Graeme Cooper tomorrow, to see what I should have seen, as Graeme said to me not to adjust the timing as the Unichip loaded a lot more in, and the advance would show"funny movements".There were no funny movements and almost no movements at all.LOL
    So maybe The Unichip has been semi dead for a long time. Stay tuned for the next exciting instalment.
    Regards Philip A
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  2. 19th August 2007, 04:32 PM #2
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    Pedro_The_Swift
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    popcorn at the ready---
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  3. 19th August 2007, 06:01 PM #3
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    Tank
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    I believe Coopers disable the Vacuum Advance when they fit the Unichip, I maybe wrong though, Regards Frank.
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  4. 19th August 2007, 06:49 PM #4
    PhilipA
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    Yes they do, but its replaced by an electronic"vacuum" advance curve.
    BUT mine looked very much like there was no light throttle advance,starting at 10degrees on idle to about 30 at 4000RPM, which is what the centrifugal does..
    Regards Philip A
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  5. 19th August 2007, 07:21 PM #5
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    justinc
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    Hi Phillip,

    Interesting about the Unichip, I would still leave the vac advance disabled as at least the ECU doesen't get perforated
    As regards the reset after disconnecting the MAF, all you need to do is turn the ignition completely off until an audible relay click (under the drivers seat in a RRC, or drivers kickpanel in a D1) is heard, usually about 5 to 7 seconds.

    Interested to hear how your O2 sensor fitment etc goes.

    JC
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  6. 19th August 2007, 07:27 PM #6
    PhilipA
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    As regards the reset after disconnecting the MAF, all you need to do is turn the ignition completely off until an audible relay click (under the drivers seat in a RRC, or drivers kickpanel in a D1) is heard, usually about 5 to 7 seconds.
    Yes, I thought about it later and thought it might, but I wasn't going to go back and do it again.
    But I wonder how many people just connect the AFM again and see no difference.The next time they start it should be back on the AFM though. It goes to show that you have to have some measure of mixture to make any conclusions about the AFM.
    Regard sPhilip A
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  7. 19th August 2007, 07:32 PM #7
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    rovercare
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    Does the unichip have a MAP point?

    Its wont effect timing until vacumm changes whilst under load or cruising if it does

    If it doesn't reference to vacuum via a map, it sounds like it solely relies on mechanical advance, which doesn't make sense, as there be no point to it except to alter fueling
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  8. 20th August 2007, 08:26 AM #8
    PhilipA
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    The unichip relies on TPS position, revs and probably AFM rate.
    Graeme Cooper reckons my observations are normal and that the electronic advance does not kick in under no load rev.
    I guess I will have to take it back to them for another dyno session to ascertain if it is OK. Graeme reckons he has never heard of a Unichip losing its timing curve.
    Regards Philip A
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