Just thought I would give you guys an update on my Mk4 AUM since my oil pump failed and shot number1 rod through the side of the engine...
Second hand block fitted from a 80k AUM fully stripped and rebuilt with h-beam steel rods from THS performance, new oil pump, oil pick up pipe and S3 BAM harder big end bearings.
Still running the K04-001 turbo, oem maf, 386cc injectors with THS FMIC and large bore Milltek turbo exhaust, but now with ported exhaust manifold, reduced collector and over sized runner port 3.
Around 100 hours fine tuning and mapping time managed to pull 334lbft 233bhp. Due to having the stronger rods I went all out on the torque mapping, which caused peak bhp losses due to flow and turbo VE, BUT.... the car holds a flat 230bhp from 3300rpm to 5300rpm which makes the average much power MORE than a full spec stage2 LCR running 280bhp.
With launch control the car will pull 0-60 in 4.5sec and 0-100 in 11.5s.
NOW The the fun part.. since we have become a NOS refil station and Wizard of NOS dealer I decided to fit a 200bhp+ wet not kit to the old girl..
which means detuning the map to 270lbft to get some peak bhp back and reduce the peak cylinder pressues and pull 3.25 degrees of timing out, it is now closer to 250bhp with the turbo running 95% at the top end.
We fitted the NOS nozzles with the 50shot jets and managed a dyno pull on NOS of 288bhp 308lbft during testing and setting the noz, at this point the idea of getting to 300bhp+ was cut short due the fuel pump hitting its hard limit. Plus the amount of timing pull was was seeing with nos on peak torque was around 10-11cf which I was not happy with, and did not want to pull any more timing back as this would cause higher EGT and lost effichency.
SO new in tank fuel pump pushing 225lph and a custom modded swirl pot fitted, this should see me well over 400bhp.
The next problem was charge cooling and keeping the ignition pull down to 5-6cf the only answer to this was a progressive injection of water &alcohol (methonal) mix direct into the inlet manifold next to the AIT sensor.
Next stage is to finish the mapping, and dial in the ratios for the NOS and 100shot jets with water meth injection, then fingers crossed 330bhp+ 380lbft and a 12s 1/4mile.
I will get some pic up tomorrow
