Here you guys go


http://www.dateam.org/Videos/porscheweblarge.mov

 

Not bad. Are the TQ numbers always that low?

 

That was the first run. Here is the dyno chart from the 2nd run

 

strange dip at 5700 rpms but otherwise solid numbers for the 3.4L... 3.6L makes about 30 foot pounds of torque more down low due to the larger displacement

 

very kewl. what's with all the smoke from the tail pipes

 

Honestly Vince your running to much fuel through that car that air fuel reading is deep into the 10:1 probably into the 9:1 ratio. Also if everyone noticed in the video the first part of the smoke is fuel however if you guys noticed the blow by after that was not fuel that was detonation. If that porsche isnt tuned soon that engine will blow up its a ticking time bomb waiting to happen.

Why dont you just send me your car so I can fix other tuners problems I think you know who I am Vince

 

There is little chance that there is detonation in the engine with that kind of F/A ratio. I think the lift of the cam at 5800 is allowing all that fuel to more easily blow out through the exhaust valves. The computer wouldn't allow engine detonation anyway.

 

Yikes, running a bit rich are we

Right at that dip, it kind of sounds like you are getting audible knocking, and the car is pulling back timing and perhaps adding fuel. When does it switch to the more aggressive cam? Hopefully it's not detonation, power looks great!

 

The graph shows no indication of timing being dialed back more than dictated by program.

 

You can isolate timing just by looking at a horsepower graph? What's causing that dip then?

 

Cam kicking up a notch. And it is a very normal graph of the engine's power curve.

 

That's a pretty large dip though - a loss of almost 50whp for the span of 500 rpm's. This is a dyno of an Evo/VF 3.4L - no dip here:

 

Lean the engine out to where it should be and most of that dip will go away. I think EVO targets 11.7 to 1. Note that the power curve does not get steady until the F/A starts getting above 10:1. It is choking before that. I have to assume that the resonance valve is still being used in his car and that is valve is slamming open at the same time the cam is shifting. This will a big kick when ity opens running slightly rich. I do not use the valve on my car. It's all in the tuning.

Dyno graphs also use different smoothing ranges. From a performance standpoint, I have never had the smoothness that EVO's graph suggest you should have. There is a big kick between 5500 and 5900 RPM and my other dyno's show it. I don't have the big drop like the graph above shows, but a big pop up in power at the same engine speed.

RW - hook up your scanner and record the rpm and timing readings and tak it up to readline. Look what happens to the timing at the power surge.

 

I know how most tuners work as I often fix software that has been written bad. I say about 90% of tuners will run too rich then add timing to hopefully lean up the air fuel a bit. Its a bad way to cheat and not spend the appropriate time to tune the car properly

 

It is simple to override the program and accurately adjust the engine to run the F/A mixture you want (or most any other parameter). I use the tuned chip for not much more that a means by which to extend the range of adjustments I can make on the engine. All a program does is react to input from sensors, so changing the readings of the sensors accomplishes the same as does the changing of the chip program (if you know what you are doing) and with virtually no cost.