how to check ignition timing
05-12-2007, 04:29 AM
#3
Burning Brakes
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Only way you can do any adjustment I have seen is using this part from FVD to advance the timing:
https://shop.fvd.de/?VID=206842&VCD=...=&CarYear=1991
https://shop.fvd.de/?VID=206842&VCD=...=&CarYear=1991
05-12-2007, 11:20 AM
#5
Burning Brakes
Originally Posted by 911addict
Staffan,
can you explain more about this part? Is it simple bolt on? What does it do and how does it help? Any downside?
can you explain more about this part? Is it simple bolt on? What does it do and how does it help? Any downside?
You can probably get away with advancing it a little... , but coupled with the fact that you can't really alter the fuelling at a particular load/rpm site as you would on an EFI equipped car, it would be largely guesswork.... ie greater chance of damaged pistons, ringlangs, etc.
05-12-2007, 12:15 PM
#6
Three Wheelin'
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If you have the Brian Leask WUR, the mixture can be enriched at higher end. In this case would the timing advance be of benefit? I presume only in conjunction with a 1 bar spring...
05-12-2007, 03:32 PM
#7
Burning Brakes
The EZ has a map boost vs rpm for ignition.
There is a jumper switch for lower grade fuel types. This would run on a different map because lower grade fuel will lead to detenation early, so by retarding the ignition you produce less power and therefore less heat...
The WUR mod will give better a/f ratio management which helps the thermal management, so it will help suppressing detention.
Going to a full mapable ignition and fuel is the main advantage of EFi. The stock timing is far from optimal torque and esp good if you use high grade fuel.
There is a jumper switch for lower grade fuel types. This would run on a different map because lower grade fuel will lead to detenation early, so by retarding the ignition you produce less power and therefore less heat...
The WUR mod will give better a/f ratio management which helps the thermal management, so it will help suppressing detention.
Going to a full mapable ignition and fuel is the main advantage of EFi. The stock timing is far from optimal torque and esp good if you use high grade fuel.
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05-12-2007, 04:20 PM
#8
Rennlist Member
hey Miles,
My 3.6T EFI haltech was set up by the tuner for 24 degrres timing .at all RPM.
i am still using the distributor which does have a mechanical advance curve built in.
What timing are you at ???
Elliot
My 3.6T EFI haltech was set up by the tuner for 24 degrres timing .at all RPM.
i am still using the distributor which does have a mechanical advance curve built in.
What timing are you at ???
Elliot
05-12-2007, 08:07 PM
#10
Race Car
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Originally Posted by Megatron-UK
The problem with advancing timing is that even though there's the possibility of gaining more power, forced induction motors are all setup to retard the timing as the boost comes on in order to reduce detonation.
You can probably get away with advancing it a little... , but coupled with the fact that you can't really alter the fuelling at a particular load/rpm site as you would on an EFI equipped car, it would be largely guesswork.... ie greater chance of damaged pistons, ringlangs, etc.
You can probably get away with advancing it a little... , but coupled with the fact that you can't really alter the fuelling at a particular load/rpm site as you would on an EFI equipped car, it would be largely guesswork.... ie greater chance of damaged pistons, ringlangs, etc.
05-12-2007, 08:11 PM
#11
Burning Brakes
I think the jumper switch is in the engine compartment..not sure tho.
Eliot: Timing is various as there is a 12 by 12 map. I have not put mine on a dyno yet to fine tune but I think 24deg for stock boost sounds about right.
Eliot: Timing is various as there is a 12 by 12 map. I have not put mine on a dyno yet to fine tune but I think 24deg for stock boost sounds about right.
05-12-2007, 11:55 PM
#12
Technical Guru
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Originally Posted by Miles965uk
The EZ has a map boost vs rpm for ignition.
There is a jumper switch for lower grade fuel types. This would run on a different map because lower grade fuel will lead to detenation early, so by retarding the ignition you produce less power and therefore less heat...
There is a jumper switch for lower grade fuel types. This would run on a different map because lower grade fuel will lead to detenation early, so by retarding the ignition you produce less power and therefore less heat...
Have you ever looked inside to see what/if type of non-volatile ram chip it contains?