HKS DLI test....

[Sin'sVr4]

I love learning, and this may be a opportunity to learn.

As noted by another, Ray has always used DLIs with non resistor plugs with no issues. I don't think he ever mentioned doing anything special like the notch filter you mention. I too have used a DLI for a very long time. My current setup, using a DLI I started using probably 4 years ago, all it has ever seen is non resistor NGK coppers, and now the champion C53VC surface discharge plugs which are non resistor.

I always run around 35-36psi. Street and drag strip. Never a hiccup.

So what is the actual issue? I know HKS has always stated no for use with non resisotor plugs. But is this just HKS covering their butts since non resistor plugs by nature will cause EMI and maybe ruin your AM radio reception. Does the DLI increase this effect so the don't want to risk it. Of course strong enough can disrupt an ECU, but again, never seen any issues or heard of any.

Please share with the class, I am all about learning.

-Chris

chris, I just bought the vc53's from you and get horrible stutter and blow out even at 14psi-23psi

With the current plugs in I cant go over 23psi again? cant figure out why

[J. Fast]

take some bailing wire to your wastegates and wire them shut. Back out of it if your boost climbs over 27psi.

[RealMcCoy]

I love learning, and this may be a opportunity to learn.

As noted by another, Ray has always used DLIs with non resistor plugs with no issues. I don't think he ever mentioned doing anything special like the notch filter you mention. I too have used a DLI for a very long time. My current setup, using a DLI I started using probably 4 years ago, all it has ever seen is non resistor NGK coppers, and now the champion C53VC surface discharge plugs which are non resistor.

I always run around 35-36psi. Street and drag strip. Never a hiccup.

So what is the actual issue? I know HKS has always stated no for use with non resisotor plugs. But is this just HKS covering their butts since non resistor plugs by nature will cause EMI and maybe ruin your AM radio reception. Does the DLI increase this effect so the don't want to risk it. Of course strong enough can disrupt an ECU, but again, never seen any issues or heard of any.

Please share with the class, I am all about learning.

-Chris

CDI ignitions like those used in motorcycles and other small powersport products, as well as MSD boxes and many other aftermarket ignition systems, have always spec'd non resistor plugs. Inductive coil systems have almost always spec'd resistor plugs. The difference has to do with spark voltage and duration. CDI systems typically have a very short duration high voltage spark that doesn't play well with resistance. Inductive systems have a lower voltage high duration spark, that uses the plug resistance to bump the spark voltage a bit..

The big mystery here, has to do with the internal workings of the DLI. Being as it is a CDI system, with a transistor controlled spark duration, augmenting a stock inductive coil system...
How it works, and what plugs may give optimum spark voltage and duration is not common knowledge, and not really expanded on by the manufacturer.

The only advice I can offer, is if what you're doing works, don't fix what isn't broken....

[KeithMac]

I've seen a fair few motorcycle ecus destroyed by running none resistor plugs, not a dig just an observation..