as usual, Digital Technology changes everything. compare swapping Weber carb jets to the X Y grid that currently controls your fuel to the millisecond. the Power FC/Datalogit provides 400 discrete cells in which to tune. stipulate timing to the tenth of a degree, anywhere. measure knock. measure EGTs. measure ANYTHING.

and so it is w AI. AI, as many of us know was used on the B-17, B-29, P-51 Mustang, the ME- 109 long before computers. and it worked well for it's application.

that'd have been a pump. some nozzles and a few switches. bingo. more boost, less knock.

this technology carried over into the racing/performance area and was the standard until solid state electronics impacted.

AI DELIVERY CURVES could now be set. pick your ramp at the twist of a dial or a few keystrokes. delivery was stipulated by changing the current to the pump. the term "Progressive" became common, referring to a "progressive" delivery ramp.

i call this the second stage in AI evolution.

how does it work? excellently. it allows you to run maximum boost anytime w pumpgas. it allows you to tune for knock and whatever AFRs you wish. i have found it to be accurate and repeatable. always. my AI comes on to the tenth of a PSI boost. thank you Digital.

welcome to 2008 and the THIRD STAGE of AI.

call it HIGH DEFINITION-AI



if the above X Y grid looks alot like your fuel map that's because it is. note RPM and BOOST (load). 16 X 16 generates 256 discrete cells. you just enter the % of maximum.

the reason the HD-AI can deliver (pun) in such an accurate manner is that the system is fundamentally different than earlier systems.

Low Definition AI delivers varying amounts of injectant by varying the pumpspeed. i am sure you are with me in understanding that an electrical pump can not be precisely controlled.

imagine if your gas map was controlled in such a manner. consider how precise the tuning of your base fuel is to arrive at a proper AFR. you are messing with milliseconds on injector ontime.... 'think a pump can do it?

HD-AI changes all this.

for the first time, ever, your AI is metered just like your base fuel. the HD-AI uses a digital module to run fuel injectors. pump speed is not used to control delivery. the pump, just like your OEM system merely provides adequate pressure and the AI fuel injectors "on-time" governs delivery.

not only can you now stipulate EXACTLY how much injectant you want but you can also do something really important....

note on the above table (which is the initial setup table for my system) that i reach max delivery (100%) around my peak torque. note that even though the RPMs continue to build after that my injectant delivery declines. this is because your engine loses Volumetric Efficiency after Peak Torque and uses less fuel.

you can't do this w the Low Def 2nd Stage AI system. generally the system reads boost and provide injectant volume off the boost reading. Progressive systems are incapable of lowering delivery after peak boost. generally most people trim base fuel to end up at a proper AFR but that is not optimum.

further, if you are road racing you are on and off the gas in a corner and boost will vary wildly. a LD-AI system can not keep up w the gyrations. the HD system will.

while there have been a few HD systems running in 07 the big transition will happen in 08.

there are, AFAIK, 3 companies offering HD-AI.

Aquamist
Coolingmist
FJO Racing.

i completed installation of my FJO system Nov 30 last year but winter arrived w a vengence so i wasn't able to get on the dyno. i expect winter to end soon, though no guarantees, and be on Beyond Redline's (Green Bay) new DynoJet Eddy Current dyno ASAP. the FJO HD AI system includes a 4 bar MAP sensor with it's own boost controller and it also interfaces w FJO's AFR module. various "safeguards" can be set relating to AFR or boost etc. general availability of the new units will be in late March.

Aquamist (UK) has an additional feature in that the unit can be keyed off of total (primary and secondary) injector duty cycle. we have a board member doing initial testing (Cosmo Kraemer). see the Auxiliary Injection Section for details.

Coolingmist also offers and has been in the forefront on the HD setup. CM has been an active member on our board and speaks rotary fluently.

here's how my HD AI is fixtured...

the injectors (2, each delivers up to 700 CC per minute. i run 100% methanol)




the business end

the modules (HD-AI w boost control and AFR) need to be near manifold as you will note a boost pressure hose...


FJO AFR gauge w low alcohol LED and J&S timing retard

AI relay near battery

perfect pump location



howard coleman

 

My AI runs of a 32X32 map..Does that make it ultra high definition?

Anyone ever notice how much the FJO solenoids look like nitrous solenoids?

Howard, ever consider putting the solenoids further downstream. I think that you would be getting significant amounts of still liquid (vice vapor) methanol hitting the TB.

 

SLo what AI system you running with a 32x32 map?

howard...March is now over..what is FJO saying about the system? ready for public?

 

as of last week FJO had received all components other than some fittings and expects to be able to ship in a matter of a few days. i expect to talk w them today and will update.

hc

 

I'm running a cooling mist HSV off the generic aux map on a haltech

 

I've got a 32x32 map as well, though half of the RPM 32 is useable.

 

Can you change the rpm points with the wolf?

 

woah, well look at that, is that the v500 hardware only? i have a v4 wolf

 

slo, unfortunately you can't change the RPM points nor the load points. They are preset. Given that fueling is primarily based on load (MAP) as opposed to RPM, this is not an issue.

Saying that, the resolution on the RPM is only like this for the auxiliary channels. For my primary fueling and ignition, the RPM range is scaleable from 125 RPM increments on.

Yes, it is the V500. From everything I have seen and read about V4, it is a huge step up. It has it's little quirks, but I really like the system.

 

yeah just went though v4.72 and didnt see anything like that, damn that must be nice having AI and fuel/ign all tired together, wish i could afford a v500

 

Any updates?

 

fired motor yesterday. working out a couple of setup issues and i should be literally out of the barn.

FJO now has, and is assembling into kits, all the components for it's new AI system.

the thread will warm up v soon.

hc