The ISAC is not progressive. It is a non linear system. Like an engine management system (Tho not as elaborate by any means), the user has full control over alcohol delivery. You can add or take away alcohol at any point through the curve.
The unit does configure as a progressive system in that it allows you to set your activation RPM, TPS and boost levels and your per PSI duty cycle rise. After that, you have a series or sliders that allow you to adjust the curve +/- 25%.
As far as other things:
- The ISAC supports dual pumps out of the box. You can run the two pumps staged or in parallel.
- The ISAC has a built in data logger. It will log the entire operation of whatever system you hook it up to allow for easier tuning.
- In the same vein, the ISAC has a customizable dashboard for real time monitoring of engine operation.
- The ISAC has closed loop alcohol delivery when paired with a compatible wideband.
- The ISAC has a built in closed loop boost controller. Single or dual solenoid operation with various ways of controlling the boost. The boost controller also includes launch boost and provisions for gear based boost control.
- When using the boost controller, the ISAC has several engine failsafes in case the system malfunctions. If your A/F ratio goes over a set number, the ISAC drops the boost. It can also be used with a simple pressure switch on the pump head or it can be used in what I think is the best method, utilizing the
IFS-20 Flow Monitor that Labonte Motorsports sells. This measure the flow of the system and if the flow drops, the ISAC will dump all the boost down to your wastegate spring pressure. I personally think measuring flow is a better method of failsafe detection but thats just my opinion. It also works with a low level sensor in the same way. Drops the boost.
- The ISAC is compatible with a large number of pressure sensors which allow the unit to deliver methanol up to 150 PSI. This addition doesnt mean much to the Buick guys but the diesel guys love it.
- The ISAC has two built in window switches that can be utilized for a variety of things such as activating a shift light, nitrous solenoids, etc. They do share a channel with the boost controller tho so if you use both channels for the boost controller, the window switch option is not available. MOST people have used the single solenoid control method, tho.
- The ISAC has a user configurable knob on the front of the unit that can be configured for real time alcohol delivery adjustments, boost adjustments, etc.
- The ISAC can be updated in the field via firmware updates you download from the website. Bug fixes, feature additions, etc.
We never offered a custom kit but instead used the Labonte Motorsports basic kit and added the ISAC to the package. Using the Metco fuel cell that goes in the trunk, you could fab up a pretty impressive system for the Buicks.
We have begun talking to a company about having a custom pump manufactured for us, however. Clean sheet of paper, 100% methanol compatible pump designed for what we're doing with it. Very preliminary at this point but Ill update when I have more information to share.