Thom

Chris, what do you make of Tom M'Guinn's comment? According to your post, what Tom said is fantasy?

Adonay

Why would that be a fantasy ? If he can run bigger gaps in the plugs now and never have problems with the spark not igniting the fuel again . Its not actually him gaining HP its him getting what the engine should produce in the first place, but cant because of the weak factory spark\rotor system failing to ignite the fuel. As written before The advantage is at high boost with a overly rich condition is were a stronger spark shines or for that sake even a msd spark shines.

Thom

What then "should the engine produce in the first place" if it's not HP?

Adonay

Im just saying that a wasted spark does not give you a instant 100 RWHP it can only be a improvement were the conventional rotor system would suffer. I guess your right though the way i wrote my point does seem a bit fishy.

Chris White

Stronger spark is a good thing! John's wasted spark will deliver a stronger spark than the stock system - especially at higher RPM. Twice the dwell time and a better coil pack.

The higher you run your boost the harder it is to create a good spark.

So – I think Tom is not in fantasy land!

TurboTommy

Hmmm,
that's good info;
it fires 20 degrees before BTDC, so yes, of course even with an aggressive cam it shouldn't be a problem. I never thought of that.
Hmmm, what to do, what to do.

Rogue_Ant

The waste-spark ignition event is dynamic in nature, not static...
It is not set to fire exactly 20degrees BTDC, rather it will fire the same as whatever conjoined cylinder. So the ignition event is dependent of the timing map - only John could tell you the range of possibility.


-Rogue

Chris White

True - it follows the ignition timing curve...but when on boost its very close to 20 degrees BTDC!

TurboTommy

Yes, I realize it was just approx. 20 degrees.
I just meant it was good to know that it was far enough away from a valve overlap event.
I've got a bit of a richness problem on trailing throttle, and concerned what would happen when there's an ignition source when there's not really supposed to be an ignition source; in essence, if you's know what I mean.
I should have thought a little more precisely about what exactly is going on in my engine at wasted ignition point on exhaust stroke BTDC corresponding to the compression stroke timing.

ehall

okay, so since the topic was posted, of how much value is WS to a fairly stock 951 engine?

Chris White

I’ll toss out a general comment on engine management mods –
“generally” engine management changes allow you to take advantage of other changes to the engine – higher boost, bigger turbo, race gas, different cam, or any other physical change to the engine. The Porsche engineers weren’t dummies – the stock system is fairly well optimized for tis design parameters.

If you decide to change the physical parameters you will need to adjust the engine management system to get the most out of the modification.

So –to answer the question – a ‘fairly stock’ engine will does not need anytihg more than a ‘fairly stock’ engine management system – as long as everything is operating correctly!

Thom

Come on Vitesse customers, please show more interest as I really want WS for my engine!

alxdgr8

Might be interested down the road. Would be nice if it were cheaper than the last iteration.

fast951

The idea is to bring the WS at a much cheaper price than the last one. Of course it will not be the same unit.

To bring the cost down, we need to build them in quantity.

gregeast

Price was certainly the limiting factor for me, I suspect a "much cheaper price" would expand the market significantly. Considering an OE quality cap and rotor cost $80+, the new WS might actually pay for itself in a few years.