OK, OK, OK. Sorry for the late reply...
The mapping may of taken a little while today - all day in fact. I pitched up at about 9.05 this morning, and left at about 16:40, so a long day for all concerned.
Mapping was slow but steady, hampered by various factors.
VXR injectors (at an alleged 470cc) were not big enough. Two possible factors here - firstly that they aren't 470cc. The other possibility being that the large port head on the S3 is pulling in more air than expected. Either way, they were maxxed out. ****.
Faced with two possibilities at this point. Either fit some larger injectors, like Genesis 550s and solve the issue that way, or try and eak some extra flow out of the VXR injectors using a 4 bar FPR. Now, 4 bar FPRs not being ideal as they have a tendency to hose the fuel pump, was the option I went for as I had one at home, and a new fuel pump is cheaper than another set of injectors.... lol.
Anyway, the 4 bar FPR blag worked and the duty cycle on the injectors dropped to tolerable levels, and enough fuel was being provided at that point for a happy engine.
Initial runs on actuator pressure produced 235 bhp. N75 boost control is out as on option for now, as the boost control table on the map needs to be altered drastically to make this work. At this point, for mapping purposes, Tuffty very graciously lent me his Forge UNOS boost controller so that mapping could continue. Cheers love
:thumbsup:.
Boost set initially to 23 PSI and then upwards as we went through the stages of getting the map right.
It's there or there abouts now, and Bill will be sending the file off, with notes of the changes that have been made to the engine (4 bar FPR), and the various changes made to the map.
Now - down to business - power output.
Saw various stages of power output during the day, moving ever upwards.
Last runs we showing around 290 BHP with torque of around the 275 lbft mark. Boost is set to 25 PSI and will then hold 21+ PSI all the way to the redline.
Mapping not finished yet, and need to get back to Bill's tomorrow for the flash of the updated file and some more tweaking.
Interested to see what the car will output on a first run. The later power runs where it was making 290, the engine was VERY hot by this point and was suffering from heat soak. Having had a chat with Bill, he said I would be surprised what a difference a cooler engine will make, but that remains to be seen.
Power figures not that important to be honest - drive ability however is great. Spools and drives like a big turbo S3, which is a bit weird, considering it's not... Really feel strong on the road, and pulls all the way to the redline as the boost doesn't drop off like it does with a K04. The difference is incredible.
Bill, when I left told me not to gun it too much, however I had to bend the rules a tad on the way back from the takeaway, as coming up the A38 was a UK 300 Scooby that skinned me a few months ago when I had a play. Interested to deal a little payback, I was nailed to his **** all round the twisty turns of the Gloucestershire countryside - this pleased me. Immensely. He pulled into a petrol station, and needing juice, I followed suit. So, me and my mate who was with me had a laugh at his expense, much to his disgust.
S3 FTW. :thumbsup:
Liquid is showing me 257+ g/s air flow and estimated 321 BHP. We shall see.
I will keep you posted.
Thanks to Bill for all his efforts today - :thumbsup:
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