: easiest way to tune down boost?


pitstops
11-28-2009, 03:31 PM
i am hitting 27 psi in all gears, i want to tune it down to about 23psi, what would be the most simple way to do this using ecuflash?

joey
11-28-2009, 03:32 PM
Nevermind. PM HollywoodX or Gunzo, they should be able to help.

pitstops
11-28-2009, 03:40 PM
iam actually using gunzo's generic boost maps

verkion
11-29-2009, 06:37 AM
What mods you got? Need a little more info.

The general basic principle is this, want less boost, divert LESS air from hitting the WG by lowering the duty cycles on the solenoid. Less duty cycles on solenoid = less air being bypassed from hitting WG = WG open wider/bit more = less air hitting turbo = less turbo Pressure. Want more boost? Do the exact opposite.

Next question, got an AFR? And are what parameters are you logging...check if you have any knock!

verkion

BigT
11-29-2009, 07:48 AM
If it isn't knocking, keep on chugging. I'm running 27psi daily. Granted, it still falls on its nose to 20.5psi by redline.

pitstops
11-29-2009, 03:19 PM
10psi, 2500rpm, 14.4afr
25psi, 3000rpm, 13.8afr
28psi, 3300rpm, 13.4afr
26psi, 3500rpm, 11.6afr
23psi, 4000rpm, 12.1afr
19psi, 6000rpm, 11.2afr

no knock to 2 counts.

upgraded intercooler, intake, tbe, intercooler pipes.

overboosting started when i switch to a single exhaust from a dual.

i lowered my active duty cycles to 70% in the 3-4k rpm range, lets see if that fixes it.

xPRimNT
11-29-2009, 04:28 PM
Just reduce the peak boost RPM duty cycles (passive) to hit the desired peak. You may need to observe how much boost error correction your car is using too!

It's not a bad idea to fully tune your boost from square one. Gunzo's maps are good, but they're really only a starting point.

pitstops
11-29-2009, 05:58 PM
Even with the stock tune I would overboost. Iam still overboosting with 70, I'll drop it down some more along with the passive.
I'll probably start from scratch, iam hitting 290 load cells.

pitstops
11-29-2009, 06:00 PM
Or just put my stock cat back on and limit some flow