To avoid wasting anyone's time, I copy post 18 in here:
Quote:
Guys, I must admit I this thread was a mistake. Thank you for all your input. I apologize much for wasting your time!
I didn't do my due diligence and jumped to conclusions. I relied on memory and didn't load up all my old logs. I used one perhaps too optimistic log as a reference.
Anyway, loading up a bunch of logs, sorting and discarding based on shape and deviating number in either direction I came up with this. Admittedly it's biased towards the better numbers - but hey that what the pros do too 
So in reality, I may be around 175-177 hp now vs. 168-170 before. More important than the actual number, this gap is present in the whole curve now.
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---------------------- Original post----------------
I did 4 pulls today on as perfect flat road as they get - 2 in each direction.
I loaded the logs with Virtual Dyno, compensating for IAT and ambient pressure as read out from the logs at 4000 rpm. Compensated for wheel size (own measurement) to compare with my old logs (winter wheels).
So here are the results:
- Red, blue, dark green, yellow (first 4, are todays pulls). This is with a Gruppe S header and Wayno's most recent stg 2 tune and OFH timing.
The light green:
- A bit unreliable from when everything (incl tune) was stock but the best I have and fairly similar shape and number as an actual real life dyno pull I had made during a dyno day.
Here is the bummer:
- The purple pull is one of Wayno's most recent stg 1 tunes, with some extra timing. I don't think that it's more power than some of todays pulls as virtual dyno suggests. But just the fact that it appears to be in the same ball park I find truly disappointing.
I was expecting a 10 hp gain from installing the header. While the 4000 rpm torque dip improvement is nice, I'm not sure I think it can be right?
Butt dyno says there is more power obviously especially in the torque dip. But now I am starting to doubt if the rest perceived improvement is placebo? I'm a man of science, I tend to believe more in number than feelings.
Don't know if it's screwing up because of the wheel sizes? The old pulls where with AD08Rs in 225x40R18... Todays pulls with stock Primacys 215x45R17.
I'm close to putting the AD08Rs on to see if it makes a difference, though it might not be the best idea with temperatures below freezing at the moment.
If these are indeed true numbers, the header is being put up for sale!
Edit:
Here are the logs in datazap (3 logs):
http://datazap.me/u/tor/ft86club
No IAM drops in play or otherwise strange.
As mentioned IAT taken from 4000 rpm and pressure from an average of the highest and lowest in the logs, wheel sizes 24.88 for the old pulls, 24.6 for todays pulls. 2769 lbs weight for the car and 165 for the driver.