What's all this, "Stephen's car was tuned for the Fabspeed". I was under the impression our ECU's were adaptive (to a degree) and that Stephen drove with each exhaust for 50 miles or so for his "tuning" to optimize for each exhaust?

Mike

 

Mike,

I really don't want to poke my head up in this thread for obvious reasons, but I did want to address the question you have. Exhaust is a funny thing, do I want more, too loud, too soft, too much back pressure etc. What I provided was not a this is better than that. It was a looking glass to a real world use and what works best for EACH PERSON. Some people want more noise, some less, some more low end and some more upper end. 20HP is not a big band and at the end of the day should be based on ones needs. This was my biggest fear with the testing...That is why I kept it about the numbers and my opinion was simply left out.

You are correct. Each system was allowed to adapt into the car. During another test not related to the exhaust testing I watched a car adjust nearly 40HP. This is above the norm as 30HP swing one way or the other is what we see. Any mod that will move more than 30 HP should have a different tuning to the ecu to change the thresholds. We see these cars do all sorts of things that still amaze us. On Fri. Ryan's car laid 560RWHP on a Fabspeed quiet, while Don's didn't. These cars are so adaptive because of the closed loop aspect they constantly change as they need to.

What is else amazing???...what is amazing is my damn fuel pump died today in mine. What the hell!!!

 

Stephen,

I am asking you to expound on the above. How did you allow it to adapt? In addition was the Fabspeed exhaust part of the test cars tuned package? I'm sure many people on this forum believe that turning on the key and driving fifty miles allows the car to adapt. We both know if you drive the car differently or under different ambient conditions, it will adapt differently. In addition, it has limits to how far it will adapt.

 

Chad,

My test results were arrived in the same manner, adapted the same route, under the same conditions and driven in the same stretches with the same acceleration and load levels to create the exact testing results. You know I waited days sometimes to run the stretch and certainly the dynos. Each muffler was started on a zero learn ECU. I reset every time we installed a new ECU prior to starting the car. Sorry for misleading. You are correct, simply changing something on the car and driving like a granny will not adapt in a aggressive nature. The cars have to cycles of learning. The first is very fast and runs close to the limits to see how close it can get to the threshold of the knock sensors in relation to the target AFR. Several hard low lugging burst will adapt this very fast. The second phase is the system looks at the overall performance by determining against the map what and how the car is driven like. The car watches the average TPS position, the rate of which that level was achieved and how often it is done along with the rpm levels and once again how often. It then compares these maps and will sense driving style and adjust for a more aggressive stance on the system or not. One aspect of this is seen through the boost controller. Like a HKS EVCIV we use on the older car there are two settings, one that aggressively allows boost to come up with a small spike and one that dumps early to prevent spike. The system knows how you drive your car and will swing that style around. I can always tell when the cars are not driven aggressively. We have seen the span according to the control and the AFRs carry about a 30HP ban. AFRs are not the only sensor that needs to be watched to determine this, others such as temps and certainly the knock control. Some knock is not audible so the ear is not good enough. Hope this helps to clarify.

 

cool!

 

Which Europipe did you test? Stage 2 loud or quiet?

Thanks
Arnie

 

Your right.... Whatever makes us enjoy our car's is what we should purchase. It's all about enjoyment....

But it does gets old seeing the same people bash the same products/company over and over like we don't already know their opinion from the hundred other times they stated it...

See you in a few weeks.....

 

Stephen - what tuning package is on SHank's car?? 560 RWHP is IMPRESSIVE!!

 

Not a secret. Stage 4GT, right Stephen?

 

Yes sir....BTW talk about a car that is fun do drive. Geez. It had everyone at the dyno drooling!

 

Oooer I bet it's ficking sweet. Nice one Shank!!! This one will no doubt blow the TT you had out of the water.