FVD Ignition Sensor Holder
05-26-2007, 03:53 PM
#1
Track Day
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FVD Ignition Sensor Holder
Has anyone installed this FVD Ignition Sensor Holder? Can anyone identify the pros and cons to this unit part#FVD 999 RS5 24A ?
"10HP MORE!!!!! Ignition timing advanced.Requires minor modification on gearbox housing. "
"10HP MORE!!!!! Ignition timing advanced.Requires minor modification on gearbox housing. "
05-26-2007, 05:25 PM
#2
Burning Brakes
There was some discussion of it here: https://rennlist.com/forums/964-turbo-forum/347612-how-to-check-ignition-timing.html
Pros: Likely to make the engine feel livelier under non-boost conditions, probably slightly better pick-up.
Cons: Unless you know what you're doing, advancing timing on a forced induction motor (especially one with as rudimentary control systems as ours) is rather hazardous - timing is retarded as standard in order to reduce the likelyhood of detonation.
I think anyone wanting to alter timing would be well advised to get their fuelling checked and their car rolling-road tested.
Pros: Likely to make the engine feel livelier under non-boost conditions, probably slightly better pick-up.
Cons: Unless you know what you're doing, advancing timing on a forced induction motor (especially one with as rudimentary control systems as ours) is rather hazardous - timing is retarded as standard in order to reduce the likelyhood of detonation.
I think anyone wanting to alter timing would be well advised to get their fuelling checked and their car rolling-road tested.
05-26-2007, 06:31 PM
#3
Racer
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If it works anything like the roock version you will be pleased. On my 3.6 bog standard if you changed at the 6800rpm redline you still had half a second of lag. With the mod you can change at 6000rpm and there is no lag. Porsche backed the timing off in case people tweeked the boost a little.
06-27-2007, 08:57 PM
#6
Track Day
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I was told you need to grind the gearbox housing where the sensor is installed for fitment. I am installing mine shortly.
Last edited by M5_965turbo; 06-27-2007 at 09:19 PM.
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06-29-2007, 09:45 AM
#12
hi,
yes, it says 6.5 deg timing advance. therefore the diameter of the flywheel has to be about 280 mm, circumference 880 mm / 360 = 2, 444 mm per degree. support of the fvd holder against stock is 16mm / 2,444 = 6.5454 degrees.
and yes, it´s a fixed add on to stock advance ocross the rev range.
according to the shop manual ignition advance has to be 40 deg from 3000 rpm upwards at 400 mbar ( no boost) and 21 deg. at 1.750 mbar (boost), which in my opinion is not that conservative.
considering that the 965 does not have any knock control system i tend to recommend gaining more performance by keeping the gastank nearly dry or the passenger seat empty or the drivers-bmi under 25 ....
fritz
yes, it says 6.5 deg timing advance. therefore the diameter of the flywheel has to be about 280 mm, circumference 880 mm / 360 = 2, 444 mm per degree. support of the fvd holder against stock is 16mm / 2,444 = 6.5454 degrees.
and yes, it´s a fixed add on to stock advance ocross the rev range.
according to the shop manual ignition advance has to be 40 deg from 3000 rpm upwards at 400 mbar ( no boost) and 21 deg. at 1.750 mbar (boost), which in my opinion is not that conservative.
considering that the 965 does not have any knock control system i tend to recommend gaining more performance by keeping the gastank nearly dry or the passenger seat empty or the drivers-bmi under 25 ....
fritz
Last edited by fritz k.; 06-29-2007 at 12:25 PM.
11-23-2008, 02:17 PM
#14
Has anyone installed this FVD ignition upgrade?
http://shop.fvd.de/us/en/Porsche-0/9...ne-Rating.html
http://shop.fvd.de/us/en/Porsche-0/9...ne-Rating.html
