To fix your issue
A. need a good maf sensor
B. Boost pressure test all the plumbing to ensure no boost leaks
C. position maf in optimal location (around no turbulent bends, and far from turbo inlet, and use an air filter)
D. Recirculate the bypass or use an HKS SSQV style bypass ONLY
E. Use the rom tune + wideband + Safc to get fueling correct
Using this method should be able to command any 450hp sr/ka
only need a wideband when passing 500rwhp with that maf.
maf is very reliable and ideal, just needs proper tuning.
Last week I tuned a 450rwhp with that maf running out of pump/injectors on an sr20det 28psi of boost
pic for fun
