rufm5

I finally got around to installing the FVD ignition holder and the car feels much better all around. I am also using 2 bottles of Lucas Octane booster per fill up.

Geoffrey

That is one of the dumest things that has been produced. You are moving the position of the crank position sensor from the stock location and thereby altering what the Ignition ECU thinks is TDC from where it mechanically occurs. So, when the ignition table in the Ignition ECU is calling for say 10 degrees of ignition advance, the engine actually is 16.5 degrees of advance (using the 6.5 degree change listed in the above post). So, this is like twisting the distributor on a small block Chevy engine. I'd rather have the ECU ignition table altered WHERE it needs altering rather than just across the board.

Dumb, dumb, dumb!

JamesE

Is that made by Darwin?

Metal Guru

How about giving us an engineering reason as to why it's so dumb.....
If a car doesn't have programmable ignition then "twisting the distributor" is the only option. By the way, lots of guys "twist the distributor" on their 930s too.

Steven C.

I am about to do a clutch and we are going to "twist" the cams while it's out. A lot of Elvis going on here!

rufm5

Geoffrey I will give FVD and Eddie Bello your regards since they have no idea what they are doing Yes EFI would be ideal however the car drives real nice and took it to 205MPH this weekend with my buddy's Supra...Haltech EFI is next for sure using the best Porsche tuner Eddie Bello

...the dumb comment comes from Racetek Engineering....show me your tuning skills compared to this

http://www.youtube.com/watch?v=0CwlJaeKQ_k

Megatron-UK

Where's the airflow for that truck-sized intercooler in the above video?

Geoffrey

The EZ ignition system in the 964 Turbo is an ignition ECU of sorts with an ignition map for the different running conditions of the engine. You are simply assuming that there is 6.5 degrees of ignition advance left on the table across the entire engine operating range (manifold pressure and RPM). The engine has different cylinder pressures at different operating ranges and each range will require a different ignition timing value which is whey you have an ignition map. Less ignition timing when the volumetric efficiency is higher. 6.5 degrees is a lot to assume is left on the table in all of the ranges. The part FVD sells is simply gaming the system which is crude to begin with. There are only 3 teeth on the flywheel so the resolution of the system is only 120 degrees compared to something like 60-2 which has a resolution of 6 degrees.

Yep, and lots of guys find their wallets lighter too.

Dude, you have no idea what you are talking about and I'm not going get into a comparison against Eddie or whoever. BTW, tell Eddie I said Hi.

Metal Guru

Geoffrey,

Lots of guys playing with timing on their 930s here: http://forums.pelicanparts.com/911-9...od-thread.html

No blown engines yet.
I personally would not take the risk. As we all know, audible detonation is a tragic (and expensive) event on a supercharged engine. I'm more than happy to let someone else pioneer this mod.

rufm5

Also like many manufacturers OEM tuning/timing account for lower quality fuel thresholds.....and to further generalize most chip modification companies increase timing to gain HP with consideration that the owner will only use premium fuel......same concept here.....according to YYC930 they have built many 964 turbo cars including 10+ with the FVD ignition sensor holder.....I like this mod as the car is more responsive and it is fairly inexpensive......

Geoffrey

Interesting last post...


Damage will also occur from detonation you cannot hear. With a loud exhaust and open wastegate, it is difficult to hear detonation on a turbo engine.

bogey1

Mark, what did you do to your tranny to see 205 mph in a widebody C2?

al 965

Id like to see that "205" mph cis car run my self . Eddie is a friend of mine also and his car is far from using as a comparison here.

rufm5

For a small entrance fee I will take you for a ride