[DannoXYZ]

Uh no. Look at every single chip on the DME board and you'll see that there is no re-writeable storage of any kind. This has been verified ad-naseaum with datalogging which shows no changes to injector or ignition timing between different runs. The only thing that changes the pre-programmed stored base-map values is engine/air-temp sensor and O2-sensor feedback in real-time. Those changes are not cummulative and is not stored anywhere. There is an error in that book in that the authors got earlier Motronic ML3.1 mixed up with the later Motronic M3.1 which does have storage.

Here's what I've done on head-work, if you're gonna do it, don't do halfway-solutions:

1. 2-4mm bigger valves with narrower stems (new guides & seals), lighter than stock by 15-20%

2. back-cut heads

3. fully-contoured variable-radius valve-seats. Think 7-angle is better than 3-angle or 5-angle? How about 50-angles, 100-angles? Curved seat gives much, much better flow at any given valve-lift. And the different curvatures match the different flow-patterns around the valve. The side that's closest to the cylinder-wall needs a different curve for best-flow. The side that's next to the other valve needs a different radius than the area's that 90-degrees away.

4. beryllium valve-seats has much, much faster heat-transfer than any other material.

5. full D-porting of intake-tract from valve-seat all the way to plenum. Be very, very careful to match the port cross-section at the manifold-to-head intersection. Use the gasket as a template to match both sides.

6. tear-drop the valve-guide where it protrudges into the intake

7. cam-profile to match all the above. Needs longer duration on both intake & exhaust, more overlap and later intake-closing. This flattens out the torque-curve so it's flatter and doesn't drop 20-30% of your max-torque by redline.

8. long-tube headers, 4-1. Flattens torque-curve and holds max-torque to redline. Broadfoot-racing has one.


It all really comes down to what performance-specs you want and budget.