OK, it has been a rather large week in the world of 81TTN.
I dropped her off to Nick last Monday and had a very long list for him to work through.
Starting with installing the new SCR Pro rotors to the old hats, then install new H16 pads in the front. Following this I then had ARD legal braided lines installed to try to get better pedal feel on the track and while i had them all apart i replace the seals with genuine subaru job - and that was a good thing as the old ones had not taken to nicely to the heat and were completely shagged.
From there i had a new muffler installed in her to get her down to a usable dB reading, and Nick absolutely smashed it and she is now 94.5 dB at 4000rpm at about 5 metres
Then is new fuel system that she is running. I am now using the Walbro GSS342 (still sitting inside the Spec C intank surge tank) as a lift pump to feed a custom made swirl pot that is mounted in the boot and has all lines external - so there is no smell in the cabin at all!!!
From here it is gravity fed to a big Bosch 044 which feeds the engine with more than enough fuel.
With all this work done, i picked her up on the trailer Friday night at 8 o'clock ready for the trip to Toowoomba at 6am on Saturday.
We had a bit of a dick about in the morning as there was a guy on the dyno that had not booked it and said he would be 10 mins, but actually took 3 and a half hours.
Having the 3.5 hours to chat with him, Michael had a firm grasp on what i wanted and how i wanted the car to handle, and the short story is that i want it to pull harder out of the corners in the mid RPM range - even if i had to give up top end power.
But finally Michael and I strapped her down to the dyno and did a couple of base power runs, and to my surprise it was already running more power than last year - up from 193 to 195 @21.5psi. Michael said that this was because the last dyno graph showed the fuel was a little weak up the top coming from the Walbro, but the 044 was feeding it well and therefore there was no ECU correction going on. He then talked me through the tune that was on the car and showed me where it was good and where is could be improved. Seeing this after the morning chat filled me with so much confidence that he knew what he was on about - this man literally lives tuning Subaru and Mitsubishi factory ECUs; he knows every little setting and what it does. and knows that by changing this number over here it will effect these 3 things over there!!!!
Anyway.... the car then sat there shut down for about an hour as Michael did what he does on the lappy and deleted the old tune and then programmed the ECU from from scratch with the focus on midrange.
The first run on this tune that he just pulled out of his arse ran over 200kw @ 20psi at the wheels and i nearly fell off the seat.
From here she ran about another 10 runs just to perfect the tune and by then end of the day she was running a very safe 208.1kw @ 18psi (3 less than the old tune making less power!) and is so smooth it is unbelievable.
For example the old tune had a 10deg knock correction programmed, so when the ECU recorded knock it would throw the full 10degs at it. But Michael spent about 30mins just programing a linear knock curve that goes up in single figure increments. I used to see the 10deg of correction all the time, as that is all that it had available to it, but driving it yesterday and a bit today i have not seen any more than 7.5deg and that was because i was trying to get it by using a high gear. if you are in the correct gear i don't really see anything over 5 much.
For shits and giggles we thought that we would see how much power she would make on 12psi with some tweaks to the maps... and to my surprise it pulled a rather respectful 176kw ... so we then saved that as Tune B on the ECU.
Just for good measure i also had him enable Launch Control too
so i will be testing that out on Sunday at the dirt
So at the end of the day, i had a heap of tips and tricks on the car and tuning them, along with a Tune A that was 15kw more than i had before most of the way through the range (remembering that i have not added any performance mods apart from getting more fuel to the engine - so that is all in tuning!!!!!!) and a Tune B that i might use
and Launch Control, so i can say that Michael from OPMSport is a complete champion and knows his shit!!! i can not recommend him enough!!!!