Just back from the Dyno - 81kW at the front wheels!
- Power up to 81KW
- Jetting upped as it was leaning out up 5K 6K 7K
- Mains increased to 159 (Was 145)
- Was pinging - compression is up heaps.
- Timing set for 2° static 24° total.
- Cam Timing best left at 0°
Very different car to drive now. :)
Here's the old and new plots side by side.
The RPM scale is a bit more compressed on the newer plot as this time round as the diff ratio is lower.
Bigger valves, bigger ports, bigger cam, +2mm on the Venturis, Higher compression.
http://www.vwwatercooled.com.au/foru...P1340035-1.jpg
Here's a hi- res version should you want more detail.
http://i221.photobucket.com/albums/d...e/P1340036.jpg
Need to see if I can get cold air to the carbs, there's a kW to be had. The 81 pass was with the bonnet open, the 80 with it closed, both ways the inlet temp was pretty high.
Gear linkages need a sorting out too, The motor might have shifted a fraction and selecting 1 & 2 is a bit tricky at the moment. I missed a shift on the way home and something made a worrying noise. Tomorrows job is to figure out what the noise was. After an inital inspection I don't think it's engine or box related, sounded more like a something wrapping around a driveshaft, might even have been road debris.
It goes like a cut cat now! Very happy with the result, I would have killed it for sure if it weren't for the Dyno, it was lean and pinging at high RPM before the tune.
Compression is way up, Dyno people think I've hit about 11.5:1 which is what I was aiming for. Made for a very narrow tuning window for them though. A couple of degrees either side on the cam or ignition timing and the power drops off or it starts pinging. That's why only 24° total advance.
Sounds like an F2 car now, probably way too loud to drive on the street much anymore.
Next outing is Phillip Island Sprints on Sunday the 14th of Feb. Supp regs are up on the PIARC site and there's driver familiarisation running on the Saturday if anyone wants to get some practice in.
Pete
