SR 5k Rev Limit Woes

[DLo Eric]

While at a local event recently, I've been having somewhat of a dangerous problem (while drifting at least). Basically it seems like I'm hitting a rev limiter at 5k at about half throttle and around it. However full throttle is fine, it just flies to redline. It's boosting fine, no leaks and has plenty of power. It just started happening at the event. While a month ago when I drove it at wsir, it was running great.

My best description is a "stock" fuel cut at 5k and only at 5k.

- No boost leak. (removed all piping and inspected couplers)
- Wideband read 10-11 AFR when experiencing "rev limit"
- Can get passed "rev limit" at WOT
- Boosts Fine / Has Power


Any ideas?

Here's my setup.

S13 Blacktop w/ GT28R at 15 lbs
Splitfire Ignition Coils
NGK Iridium IX's
Walbro 255
GReddy FMIC
Megan Manifold
Stock Injectors
Stock FPR
z32 Maf
CS Downpipe
5Zigen pro racer 3''
SAFC2 (pretty maxed out but runs around 12 afr)
NGK Wideband

[fliprayzin240sx]

Tried swapping out o2 sensor? Check your timing and spark plugs too.