In previous post, ignition cut anti lag (includes: launch control, rolling anti lag, flat shift) was used, which in my opinion, should not be used in long term - daily driving.
The main reason are hydraulic valve lifters, as well very high peaks of exhaust gas pressure and heat. Obviously, most people love really hard bangs with flames, but is it worth damaging the engine, eventually?
- Hydraulic valve lifters:
- Ignition cut to stop engine revving up at certain point, can lead to erratic valve movement, which can push out the oil from valve lifters. This significaly increases it's wear and can lead to the engine or valvetrain damage, eventually.
- Running on three or less cylinders after using the igntion anti lag, can be caused by @up point, if any other damage didn't occur already and we assume the ECU doesn't see ignition cut as misfires.
→ This problem didn't occur with fuel cut anti lag!
- Exhaust gas pressure peaks:
- Hard bangs, often with flames causes a very high peaks of exhaust gas pressure, which can lead to exhaust damage, turbine wheel or turbine bearings damage. If You are very unlucky, it can even lead to piston crack, that's why forging engine is suggested for such anti lag.
- If You have high modded car, with twinscroll turbo specially, which are very sensitive for exhaust pressure peaks, it can also cause overspeed of the turbo and then it's fatal damage.
- Exhaust gas temperature:
- Related to 2, can lead to exhaust system damage, pretty common are burned off gaskets, which honestly are the smallest problem.
- Related to 2, can lead to exhaust system damage, pretty common are burned off gaskets, which honestly are the smallest problem.
So, using fuel cut with specific ignition retard, makes the anti lag (in general meaning), predictable and a lot more safe option. I know most of the daily users, who doesn't really look for reducing the boost lag, but main reason of using anti lag are hard explosions with flames, will be dissapointed.
In summary, fuel cut anti lag has the same possibilites as ignition cut (flat shift, launch control etc), but makes it for engine, turbo and exhaust a lot safer. Obviously, if You abuse it, it can still damage some part of your car.
Simple video of fuel cut boosted launch control: