I am having a discussion with a rally racer over seas about anti lag systems. he is talking about actually going in and tuning, how the two step performs. I dont know what EFI system he is running or how he tunes it or what he tunes it to.

I was just wondering if this is something that can be done on an electromotive unit? I was under the impression that all you could do was ground out the AIT and that throws it into two step mode and 0 advance (on tec2's anyways). I am not aware of anything else that you can do to tune it, besides do coil cut off. I am new to tuning the TEC's so... please forgive my ignorance.

I use as anti lag off the line.Ground IAT add 10% fuel and have -10 timing
gives me about 15lbs of boost

What gives you the extra 10% of fuel?

Go to the default for your IAT set it where you want it. When you ground thats the amount of fuel that will be sent

Ah... didn't think of that... makes perfect sense.

Have you tested grounding the MAT with extra fuel and without? Does it make much difference by adding fuel?

Yes I have tested both ways less boost build with less fuel.

Why does the IAT have to be used? I need the IAT for tuning and compensation purposes, is there another way of setting up Anti Lag -- GPO / GPI??

I ground on a momentary switch while grounded it uses the -30 block when released it works as normal

-30 block??? In the MAT fuel enrihments table? Where to sep the ignition to retard?

The iginition set is on the main ign table mat desity advance/retard button then set the -30 cell

For the default for the IAT (Intake air temp?) do you go to Fuel Enrichments then to MAT/Voltage compensation? I have a TEC 2 and I don't see the "IAT" only the "MAT"

Then is says MAT density fuel enrichment (0-50% FPW) = 5%. So should I change that to 10%? Or am I completely in the wrong spot?

SATAN -
It would seem that the TEC2 you have has a PROM that used the single MAT adjustment rather than a table. In your case this track wouldn't work.

As for the original question, many other system like to refer to building boost on the line as anti-lag. This is a tunable option but is, in a way, indistinguishable from the 2-step. All grounding the MAT does is activate the 2-step byt telling the ECU to use the secondary rev-limit. There are many options to adjust how that revlimit works in the Revlimit setup on the revlimit page. At least, there are now. The TECII's don't have as many options as are now available on the TEC3's and TECgt's. But it is still quite possible to dial in a lot of boost on the line with a TECII.

TurboDirect -
There is an MAT table for adjusting fuel with MAT and another table for adjusting timing with the MAT sensor. The fuel adjustment is under fuel enrichments, the timing adjustment is in the Igntion Timing section (from the Ignition table in WinTEC3 and under the Ignition timing listing in WinTEC4).

Right, right... That is actually how I have mine set up now. I ground the AIT and I can build like 20lbs on the line if I need. I have heard that the 0 advance if extremely hard on the turbo though. Is that true? I mean, yeah there is a lot of unburned fuel and fire and crap going through the turbo due to 0 advance, but it doesn't seem like it would be any hotter than any other situation that a turbo would see.

Hi John

In this thread you have stated that the ignition timing during rev limiter is -12degrees (for the 3step) and that the rev limiter overrides all variables.
So according to your post, there is no way to take out ignition timing when rev limiter is engaged. Does this also apply to fuel enrichment?

Thanks
Asim

There is actually a lot more heat going into the exhaust with the timing turned back. Driving a car with too little timing will burn exahust values. The idea is the same, but exaggerated because you're running NO timing. I'm not sure exactly how the turbo will fail, but I think it's from coking up the bearing. The only thing that keeps this from being a problem is the relatively short time that you're actually using the revlimiter. So as long as you use the revlimiter as little as possible, you'll have no problems with turbo failure for a relatively long period of time.



That's right, adjusting the timing is not possible while actually on the revlimiter. But, don't forget that you're only actually on the revlimiter when the RPM's go too high. So for the short period of time when the engine is on a down-swing and below the actual limit, you have some control over the timing. Be sure to set the revlimit hysteresis to 0 and then use the MAT failure temp trick to ge the timing you need.

As for fuel, as long as you're not cutting it off, you can do whatever you want with it.