I have looked at Buschur's packages and saw that up to stage 3 the boost is still 19psi. Is there a reason for that? I am going to 23psi with just catback, intake, bov, mbc, and flash. Is that safe? Thanks!

 

I wouldn't go that high on pump gas personally, I think and accepted safe margin is 22psi on 93 octane. Your tuner will know what sort of boost they can run based on the timing they subject your car to. Get some kind of logging equipment instead of a BOV. Its useful to your tuner and will potentially prevent you from having a blown engine.

A couple considerations:
- A BOV doesn't help you until you reach the can't hold boost portion around 30psi
- Intakes cause odd instability's in the airflow to a maf, certain ones are built to avoid this but you didn't specify the make of the intake.

 

Are you seeing 23# in the lower gears, or is that floored in 4th and 5th? A lot depends on how agressive the timing is in your particular flash and how much they leaned ou your fuel tables.

As, suggested above, log a few runs and see if the ECU is pulling any timing. Also, you may wanna contact the tuner who did your particular flash and ask how much boost you can safely run on 93 octane.

Just as a rule of thumb, and since you have no way to monitor knock sensor activity or log degrees of timing retard, or exhaust gas temps and AFR's...... to play it safe I wouldn't go over 21# on 93 in a IX w/o being able to monitor knock either directly or at least indirectly.

 

Although I agree that one should be monitoring knock, AFRs, etc when tuning, I believe his question was why BR stage 3 shows 19psi. I cannot comment on the BR stages, but David knows his stuff -- so just call him (my guess is that it is either a typo or used for comparison.)

For what it is worth different tuners run different boost for base and custom tunes. I am running currently ~23 psi (peak) in my IX with 93 octane and think I can bump it up to 24/25 safely. That said, I am monitoring closely.

 

u havent upgraded ur fuel pump either?

 

The car goes in next week for the mods and tune at TT, but I have been learning alot on the boards and questioned why they were going to tune me at 23#. I was ensured 23lbs was safe, but I can always tell them to tune at 22, but then again once the car is hooked up I guess they can tell where is the right pressure.

 

go at least 23 and if custom you can get away with 25 psi peak with 93....Some have 26 peak....I am right now 25 and make take it down to 24 but keep the taper minimal....