Sameer

Guys,
Any of you'll using this ignition from Clewett Engineering? Any good? Easy to fix? Which size pulley for my car?

XDi Ignition Kits
Replace your worn out distributor with an Electromotive XDi crank-fired, high-energy, high-resolution ignition and our adapter kit for Porsche. Kit includes: XDi ignition, wire harness, crank sensor, crank trigger adapter (pulley, trigger wheel, sensor mount, distributor hole plug), and instructions. Replace your worn out distributor with an Electromotive XDi crank-fired, high-energy, high-resolution ignition and our adapter kit for Porsche.
Kit includes:

XDi ignition
wire harness
crank sensor
crank trigger adapter (pulley, trigger wheel, sensor mount, distributor hole plug)
instructions

XDi Single Plug Ignition Kits Item # Racer Net
911 Kit with 116mm pulley # 9005-116 $1,169.00
911 Kit with 127mm pulley # 9005-127 $1,169.00
911 Kit with 131mm pulley # 9005-131 $1,169.00

Geoffrey

Sameer,

These are just an evolution of the crank fired ignition Electromotive has been producing for many years. It is an inductive style ignition using coils from a mid 80s GM 6 cylinder engine (Chevy Celebrity for instance). If you go with EFI later, you'll end up replacing this system, unless you go with Electromotive TEC III which uses the crank fire coils and triggering mechanism.

Sameer

Geoffrey,
I have a friend here who is still using the stock CDI ignition with his EFI conversion on his 930. He is using DTA.

Geoffrey

Yes, and with a good CDI box it would be MUCH better than the Electromotive kit due to the ability to run a larger plug gap. The Electromotive is a weak, old inductive system where the plug gap can only be about .020"-.025" at 1 bar of boost compared to .045"-.060" with a good CDI box.

Sameer

Geoffrey,
So your saying I'm better of with something like MSD?

Geoffrey

Not necessarily. BECAUSE you don't have electronic control over ignition timing, which the Electromotive provides, it is better than the stock setup even with an MSD or equivalent. If you had a DTA or other ECU that provides electronic control over ignition timing, the CDI would be better. CDI is not necessarily better than inductive, just different, BUT a race quality CDI is much better than an olde Inductive production ignition system.

Sameer

Geoffrey,
Now i get it, thanks.

Sameer

Geoffrey
So would you recommend lets say the Motec ecu with a MSD or XDi ignition system?

Geoffrey

It would depend on a variety of things such as single plug or dual plug as well as budget.

Sameer

Geofrey,
Single plug and as well as a big budget. Reason I ask is because I'm going to be replacing my stock CDI to either the XDi or MSD.

RClewett

Geoffery,

You are correct about the XDi being part of Electromotive’s ignition evolution. Visit the Electromotive web site, this information is there. You are implying that 35 year old distributor and CD box technology is better than the new state of the art ignition systems. First of all do you see a distributor and CD box on new cars? They are all crank fired ignition with high resolution crank triggers. Porsche has been using high resolution crank triggers since 1989. High resolution crank triggers provide timing accuracy +/-.1 degrees (+/- 1/10ths of a degree). This is far more accurate than any distributor triggered system its best day. With a CD box , as engine RPM goes up, the coil charge time goes down. As charge time goes down, by about 3000 the spark starts getting weaker. Multiple coils on a 6 cylinder engine have 3 times as much charge time to the coils. This provides full spark energy to the coils to about 9000 RPM before any loss begins to occur. The typical spark duration from a CD box is about .2 milliseconds (2/10ths). The Electromotive systems spark duration is 2 milliseconds. That is 10 times as long, and can last over 90 degrees of crank rotation. The other advantages are that the advance curve is adjustable and a MAP controlled boost retard for turbos. There is also an upgrade path to Engine management. The coils may look like Chevrolet components but the system and components certainly are not.

sonny1

I concur with Richard, I have used on almost all my setups,(Motec, DTA, Electromotive,etc)the Electromotive coil packs and they are bullet proof,don't need cdi whatsoever.The only thing that may suspass it, is a coil on plug set up,(12 coils driven by a DTA setup) which I'm just finishing now, let see what happens.,cheers, Sonny.