So I've got a progressive meth kit and I'm running the portfueler with the 16g (Hahn kit). I was going to shoot for a solid 11.5:1 afr with the water/meth, does this sound good? Any additional advice? Also, I wasn't expecting to be pulling any timing with the water/meth up to 20psi with the 16g, at what point, if any, do you think timing need to be removed? My last question is, does anyone know of a speed based boost controller or a boost per gear controller that will work with our cars?

The avc-r does those things. (exspensive though)

I shoot for 11.5 with meth. I have tuned as lean as 12.0 with no issues. Timing may have to be adjusted accordingly. You should be fine running stock timing maps around 20psi. I dont believe anyone has built a boost by gear system yet, but MS does offer boost control based on rpm and TPS so you can regulate the boost in certain gears but not going WOT

Originally posted by SilvrEclips
I dont believe anyone has built a boost by gear system yet, but MS does offer boost control based on rpm and TPS so you can regulate the boost in certain gears but not going WOT

The AVC-R does a boost by gear.

Here is the text from the APEXI website.


The AVCR is a digital boost controller that allows the user to modify the boost pressure level on turbocharged vehicles. While there are many boost controllers on the market, none of the other includes as many features as the AVCR, period. Despite all of the complex features included the unit, the AVCR is flexible enough to be used by beginners. Entry level users need only to input a desired boost level and the AVCR’s trademark self learning CPU processor does the rest.


The AVCR also uses a highly durable, fast action solenoid valve to physically control the boost . The valve movement (Boost Duty Cycle) can also be modified. Raising the duty cycle increases boost response, while loweriung the duty cycle will slow boost response. This feature allows boost response adjustment for varying turbo sizes. Since larger turbos take longer to spool up ( bad low end response) the duty cycle should be raised under lower RPM’s for better response. The opposite should be done for smaller trubo’s ( excellent low – mid range response, but limited top end power.) Apex engineers address this issue by including extra menus for RPM based boost control. Drag racers may want to utilize the Gear based boost control function.

Aside from the basic functions above, the AVCR has a Start Duty Setting ( allows the boost to momentarily overshoot according to gear). The AVCR also includes a Scramble Boost function which allows the user to momentarily raise or lower the boost level at the push of a button. Raising the boost level is commonly used when an extra burst of power is needed (ex. entering a freeway). This feature can also be used in drag racing.


The driver can set the main boost level to a low setting for maximum traction then, once full traction is achieved, the scramble boost can allow the vehicle to boost full power. The AVC-R displays data in three different modes: Numerical, Analog, and Graph. Numerical Mode allows the user to monitor up to four different parameters in numbers and also shows peak hold values on demand. The Analog Mode displays up to two values in an easy to read meter style display. Peak Hold is also included in this function. The Graph mode offers real time graph plotting with a Ghost map trace feature built in. The graph can replay movement up to 60 seconds.