What is the Spark Cut Patch
The Spark Cut patch is a community patch by
franzcars. It adds a stationary spark-cut rev limiter (a 2-step), so the turbo is already spooling when you launch instead of waiting to spool after you go. It also gives 5MT cars the option of a spark-cut rev limiter in place of the factory fuel cut. Full credit to franzcars — the original thread is
here.
How it works
The patch uses the current fuel-cut RPM to enact an additional spark-cut rev limiter, as either a primary or secondary limiter. The stationary limiter is like the GSR's, but it doesn't look for the clutch switch — once RPM hits the threshold the coils stop charging (no spark) until RPM drops back below it, then it repeats, building boost very quickly. On Tephramod V2/V3 the main spark-cut limiter is variable, using the current rev limiter for the active map slot as its basis. In testing, a stock 2.0 with a 5858 built 3–5 psi off the line (depending on ambient temperature) with no additional tuning.
Recommended settings
With the fuel-cut limiter at the default 7599 and the Divider at 1.11, the spark-cut limiter lands just above 7500. On a 5MT the stationary can stay at the default 5500, but you'll need to raise the stationary rev-limiter under-limits. On an SST it must be set below the throttle-closure RPM for launch control — 4500–4600 was the most effective in testing. To raise your launch control rpm - XSpec offers custom SST Firmware
here
⚠ Warnings
Repeated launches in quick succession will harm your clutches and/or transmission, and sitting on the rev limiter for an extended period causes component fatigue and failure. Off-road / motorsport use only.