207

iTrader: (1)

What ignition system works with the PFC wastespark to do 600hp and 32psi with AI?

arghx

iTrader: (3)

I am not sure if this has even been attempted (and talked about on here afterwards). I don't even know what the limits of FC ignition coils + HKS twin power are. I've run 21psi max.

207

iTrader: (1)

From reasearch of the forum the Twin Power limits seems to around 450-500hp and 24psi, but maybe someone else has done better.

4WDrift

iTrader: (3)

speaking with my tuner he has tuned a car to 24-25psi on stock fc coils without the hks. So with hks you might be able to see that

207

iTrader: (1)

I hate to say it but I'm considering changing my ECU to something that can handle direct spark because this seems to be a limitation of the PFC.

thewird

iTrader: (8)

M&W CDI and coils...

thewird

kevinbtz

iTrader: (4)

I have ran a msd 6a with a TII leading coil in several setups and have never had a problem with it. Recently I installed a 6a/TII coil in place of the twin power and noticed a night and day deference in smoothness and power. My current setup is a ported/scalloped low comp. motor with a greddy t88 @ 27 psi, pump gas (shell 93), and 16 gph of off the shelf washer fluid. The msd/TII route might not be the "best", but it has always worked for me especially for the price.

207

iTrader: (1)

your setup is very similar to mine but it still breaks up at 26psi. What spark plugs are you running?

ttmott

iTrader: (1)

I don't think the issue here is the PFC as all this does is provide the trigger. High chamber pressures require high amperage ignition systems. Reciprocating engines have a hard time lighting such high pressures consistently and realiabily. Remember it's not necessarily boost but rather the compressed chamber pressure that affects transmission of spark across the plug's electrodes. Boost, however, is the significant contributor to the chamber pressure but the fuel load and distribution is just as important. The MSD 6 series will provide good primary voltage (around 450) but cannot really drive the high amperage as it deliveres only around 100 millijoules. Lighting these pressures reliability require essentially arc welder ignition systems. The MSD multi spark feature is only applicable at idle and low RPM as the all important coil saturation time runs out at the higher RPM's.

So a good amplifier and more importantly good coils that deliver not only high voltage but high amperage. Just as important is to be able to deliver battery amperage to the ignition system; 10 gauge wire directly from the battery as a minimum. Lastly, for high chamber pressures the waste spark configuration must be changed to separate coils if the leading and trailing concept is to be kept.

thewird

iTrader: (8)

M&W CDI has a box that converts wastespark to direct fire.

thewird