ISAC 2.0

SGRIM

Owner/Admin TB.com
Staff member
Mar 1, 2005
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www.t6p.com
Okay alcoholics, we are kicking around the idea of doing another run of the "ISAC."

Who would be interested?

What changes or improvements would you like to see?

For those that do not know, the ISAC was ahead of its time as a stand alone Alky controller with a boost controller. After all these years I found some are still being used and are considered one of the best units out there still...

Post up, let me know your thoughts.....
 

Nigel

Active Member
Jun 16, 2001
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Nassau, NY
Some ideas.

Boost Control:
Waste gate duty cycle selectable based on RPM, interpolates between selected points with closed loop trim.
Turn on and off based on RPM and MPH for dialing launches.
Selectable launch duty cycle.

Alky Control:
Adjustable map for RPM and Manifold pressure.
Pump pressure compensation.

Could it use the serial data from the Powerlogger for a single wire input as an option, then out put to scanmaster?
Plug and play harness option, no splicing if user wants to buy the upgrade.
Data logging capability.
 

The Granny

Active Member
Sep 30, 2015
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Houston, Texas
I've been thinking about if this is possible with XFI or not, I haven't done any research on it but a nice feature would be if alky psi falls below a certain amount at a certain amount of boost (could be configured in a table?) then the car would shut off. kind of like how the xfi has fuel/oil cutoff capabilities


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marleyskater420

still needs to learn
Aug 14, 2004
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Where mind expansion abounds
A built in screen, kinda like a Boost Leash, would be amazing.

I have to think with all the phones and small tablets running around, small screens can't be too incredibly expensive. To somehow give the controller a screen and be able to make adjustments on the controller itself (with provided push buttons) would really tap into not only the alky controller market, but a lot of the boost control market as well.
 

TurboBob

Resident mad scientist
Staff member
May 24, 2001
6,095
433
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Commerce Township, Michigan
It would be nice to variable alky output based on MAT.

Also be nice if it could lower boost if alky pressure drops.

Rick
not sure on the MAT parameter, you talking about MAT downstream of the nozzle? Thats gonna get drowned. If you're talking about MAT upstream of the nozzle, since we won't know the MAT downstream how will you know if its tuned right..... :)

The ISAC has built in window switch functions, and safety thresholds. So thats already covered.

isac-config.png
 

The Granny

Active Member
Sep 30, 2015
418
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Houston, Texas
not sure on the MAT parameter, you talking about MAT downstream of the nozzle? Thats gonna get drowned. If you're talking about MAT upstream of the nozzle, since we won't know the MAT downstream how will you know if its tuned right..... :)

The ISAC has built in window switch functions, and safety thresholds. So thats already covered.

View attachment 303549
how do the safety features work? sorry, I haven't used this system before. would something like this be possible with xfi?


Sent from my iPhone using Tapatalk
 

TurboBob

Resident mad scientist
Staff member
May 24, 2001
6,095
433
83
Commerce Township, Michigan
Some ideas.

Boost Control:
Waste gate duty cycle selectable based on RPM, interpolates between selected points with closed loop trim.
Turn on and off based on RPM and MPH for dialing launches.
Selectable launch duty cycle.

Alky Control:
Adjustable map for RPM and Manifold pressure.
Pump pressure compensation.

Could it use the serial data from the Powerlogger for a single wire input as an option, then out put to scanmaster?
Plug and play harness option, no splicing if user wants to buy the upgrade.
Data logging capability.
for boost control its closed loop, although with the gain set to 0, it becomes dutycycle control. There is RPM, Gear, and Time, so you can really contour the boost curve.

The alky is trimmable the same way, and can be closed loop based on the wideband. There is no pump pressure compensation at the moment.

serial data is an interesting idea. The ISAC does datalogging, but not internally (there's another idea)

isac-boost.png
isac-alky.png
 

TurboBob

Resident mad scientist
Staff member
May 24, 2001
6,095
433
83
Commerce Township, Michigan
how do the safety features work? sorry, I haven't used this system before. would something like this be possible with xfi?


Sent from my iPhone using Tapatalk
there are window switch functions that can be set to any of the inputs. I have also added a fuel pressure correlation function (was part of the development of the EPiC unit) that watches the fuel pressure vs the MAP pressure to make sure the pump(s) are keeping up.

as far as how to configure an XFI, thats a whole different thread.

B
 

TurboBuRick

Moderator
Staff member
Feb 18, 2006
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South subs. of Chicago
not sure on the MAT parameter, you talking about MAT downstream of the nozzle? Thats gonna get drowned. If you're talking about MAT upstream of the nozzle, since we won't know the MAT downstream how will you know if its tuned right..... :)

The ISAC has built in window switch functions, and safety thresholds. So thats already covered.

View attachment 303549
I guess its 6 of 1 or half a dozen of another. MAT rise and pressure drop would both happen if there was a problem. No?
 

TurboBob

Resident mad scientist
Staff member
May 24, 2001
6,095
433
83
Commerce Township, Michigan
since the MAT sensor would be pretty drowned, I'm not sure how fast it will react. AFR would definitely be an indicator, as well as pressure (if you are talking engine protection limits)
 

juan89

Member
Oct 22, 2008
176
18
18
Bridgeport,CT
I have the ISAC, but the instructions manual says that I have to toggle the gears up each time. How about just a single input that represents 3rd and fourth gear. Just like the MAFT Pro.
 

juan89

Member
Oct 22, 2008
176
18
18
Bridgeport,CT
Yellow/Green – Mode/Gear/Arm. This wire serves 5 purposes.
- Gear sensor. This is a linear based input for what gear you are in (Not currently implemented) - Gear shift. Ground this wire to upshift one gear on the boost controller. - Gear switch. Open circuit or voltage puts the boost controller in first gear. Grounding the wire puts the boost controller in second gear. - Stage mode. Grounding this wire puts the controller in stage mode, which resets the timer on the boost controller and activates the stage boost level. - Alcohol flow. For use with an alcohol flow monitor. This allows another method of protection when utilized.
 

TurboBob

Resident mad scientist
Staff member
May 24, 2001
6,095
433
83
Commerce Township, Michigan
Gear switch. Open circuit or voltage puts the boost controller in first gear. Grounding the wire puts the boost controller in second gear.

connect it to the 3rd gear switch circuit, then set the mode to "gear switch"

Bob
 
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