I am finishing up my build and now that I'm a couple weeks out from installing the engine I want to start figuring out a base tune so I can get the engine to fire up and start dialing it in.
Specs:
m50b25 block
m54b30 crank
m50b25 cams
locked timing
forged rods
New bearings, rings, head gasket, and seals (upgrading to cut ring gasket over the winter)
maxpeedingrods gt35r (will be upgrading to a either a borgwarner or precision turbo of similar or slightly larger specs in the next couple years)
bottom mount turbo manifold
m50 intake manifold
porsche 60lb injectors (will be upgrading pump to radium dual setup over winter)
Running 12psi (will be going to 18-20psi once I have a cut ring gasket)
VAC oil pan baffle
oil pump nut with locking wire upgrade
all lines for oil and coolant are an fitted with nylon braided line
standard coolant thermostat (upgrading to lower temp this winter)
Just looking for a base map so that I can start dialing everything in so I can drive the car at least a little this summer and fall.
Current Cars: 1995 325i Sedan (Super Clean Turbo Build Project), 2020 Mitsubishi Mirage (Because everyone needs something reliable)
RIP 1999 328i (Cremated); You were a lot of fun, and many of your parts will live on in my new project. You'll never be forgotten.
Project Bike: 1982 Suzuki GS 1100g Super Cafe Racer Build
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Very easy safe starting point.
-10psi to -5psi range (low load vacuum)
0-1000rpm 15*
1500-2000rpm 20*
2500-3000rpm 28*
3500Rpm+ 35*
0psi load (just as turbo starts making positive pressure)
0-1000rpm 10*
1500-2000rpm 15*
2500-3000rpm 21*
3500Rpm+ 24*
Be sure to vertically interpolate from 0psi load down to -5psi load across the entire rpm range.
Everything above 0psi you can subtract 1* of timing for every pound of boost.
This will get you a safe/conservative timing map (assuming decent fuel is used) and a great place to start tuning from. (Youll be within 3-5*).
Did you get her running yet?
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