Anti-Lag Experiment using Microtech

[kicker22705]

Table of Contents:
1. The Plan/Setup (Post 1)
2. The Parts (Post 2)
3. Initial Results/Experience (Post 6)
4. Video of the 2 Step Flatshifting in action on my car (Post 14)

I'm planning on setting up anti-lag system using the microtech on my mazdaspeed protege. I don't know anyone who has tried it on the msp so i thought i'd give it a shot and keep a journal of it. i'll be adding pictures/videos along the way.

I've used the 2 step feature on the microtech with some success but since i don't drag i thought i'd get more use out of an antilag system for highway runs.

I've never set up or used anti-lag before so this will be a learning experience for me. i spent some of time researching how to set it up and thought i'd finally give a go on my car. if it works, that'll be great and hopefully people will get good use out of this thread, if not, hopefully someone can learn from it and make it work. I'm open to comments/suggestions/idea so don't be shy.

1. The Plan
what i plan on doing is using one of the auxilary inputs (blue w/ red wire) on the microtech to switch on an alternate map with adjusted fuel, timing, and rev limit values for the antilag system.

The alternate map, aka my anti-lag map, will be triggered on by a 12v current. However, I don't want the 12v current to be constantly on, since i only want the anti-lag map between shifts.

So in order to have the anti-lag map on only between shifts, i will run the 12v current to a momentary switch (brakelight switch) mounted on a bracket near the clutch pedal. this will do one of two things.

a. when the clutch pedal is not pressed down, the brakelight switch will be pressed in (no current) to aux input.
b. when the clutch pedal is pressed down, the brakelight switch will be realeased (12 volt current) activating aux input map aka antilag map.

I will add one more switch, a toggle switch, to turn on/off the antilag feature since i will not want it activating everytime i pressed the clutch pedal. this will close/open the 12v current from reaching the aux input wire.

The antilag map can then be tuned on screen 29 using the InpEnrich (fuel), InpTiming (timing), and InpRPMlim (rev limit).

Once i have the tune dialed in correctly, with the antilag feature activated, i should able to build boost by pulling alot of timing, and adding a bunch of fuel to create a misfire to spool the turbo b/t shifts.

Another thing i can do is set the InpRPMlin to 5000rpm, so i can powershift w/o over-reving.

 

[kicker22705]

2. Parts List:
Microtech LT10s
18-22 guage wiring
18-22 gauge female connectors
Mazda Brake Switch - Part# UH71-66-490
Rocker Switch

edit: during the install i noticed we have 2 clutch switches, a cluch switch and a clutch cut switch. the clutch switch cannot be tapped for this, b/c the 12 volt current is off when the clutch is pressed. however, i have not checked the clutch cut switch which is the one mounted on the firewall. if the switch gives a 12v current when the clutch is pressed in, this can be tapped rather than buying a brake light switch.

 

[kicker22705]

reserved again.

 

[kicker22705]

and... one more.

 

[03.5MSP]

Mmmmmm, sounds good. Keep us posted with what you come up with, good luck Mike.

 

[kicker22705]

okay so i set up the antilag system over the weekend and got some positive results.

first the install/wiring was relatively simple and went just as planned. Only issue i ran into was i couldn't mount the new brake switch where i had originally planned, so i had to sacrafice my clutch switch to mount it in its place.

everything works just as expected. the anti-lag system arms by a switch, then actives whenever i press the clutch.

like i said earlier, i planned on trying two methods to build boost between shifts. One was by tune where i can pull enough timing and add enough fuel to create a misfire to spool the turbo.

the 2nd method was to build boost by keeping a load on the engine between shift (powershifting) without over-reving and bouncing off the factory rev limiter of 6,850 rpm.

i was not able to try the first b/c i have yet to tune it, however i did try the 2nd method. I set the InpRPMlim to 5,000rpm and didn't alter the fuel/timing. i took it down a straight road... and raced it down 2nd gear, i held down the gas, pressed the in clutch, shifted to 3rd, and the rpms dropped from 6800pm to 5,000rpm, and during the shift my boost fell from 11psi to 8-9psi between the shifts. never got close to hitting vac. The difference was noticable, you can feel a nice extra umph similar to brake boosting.

 

[gimpo2]

Let us know how the turbo takes it after a long period of time.

 

[lowandslow]

the turbo would probably like it more than not wouldn't it?

It doesn't have the dramatic changes in speed due to lack of air volume moving through the system. I would assume that means less stress on the vanes, and bearings???

Matt

 

[gimpo2]

Anti lag shoots gas into the exhaust manifold making it explode in there from the heat. Thats seems pretty stressful

 

[kicker22705]

i'm actually not using misfiring to maintain boost. i'm keeping the engine loaded between shifts to do that. its not your typical anti-lag system, jus rigged in a way to have similar effect. i'm bascially using the 2 step launch feature on the microtech as anti-lag. no additional stress on the turbo, my clutch seems to be taking the most abuse. i've noticed after a few runs it begins to slip.

 

[CrazyCaker]

subbing.

 

[Sleepy]

Isn't that called "flatshift", where an ignition cut is used to limit rpm during a WOT gear change? Antilag, I thought, was retarded igniton timing during gear change to ignite the mixture on the way out the exhaust?

 

[kicker22705]

Isn't that called "flatshift", where an ignition cut is used to limit rpm during a WOT gear change? Antilag, I thought, was retarded igniton timing during gear change to ignite the mixture on the way out the exhaust?

i didn't know there was a term for what i was doing, but that sounds pretty much the same as what i'm doing. only diff is microtech cuts the injectors instead, but both the result are the same.

i called it antilag, b/c well... its prevents lag and didn't know what else to call it. thanks for pointing that out. i'm happy you did b/c i've been able to find a lot more info on this very same setup people been using on their drag cars.

seems to be a fairly common practice amongst all kinds of turbo cars like the rx7 and wrx. people with AEM, UTEC, Cobb, and megasquirt all having been using their 2 step feature this way to build boost between shifts.

 

[kicker22705]

got a video up of 2 step flatshifting. you can see the boost holds 7-8 psi between shifts instead of dropping into 15-20vac like it normally would.

Mazdaspeed Protege 2 Step Flatshifting

 

[noclue119]

got a video up of 2 step flatshifting. you can see the boost holds 7-8 psi between shifts instead of dropping into 15-20vac like it normally would.

Mazdaspeed Protege 2 Step Flatshifting

hehe nice job mike

 

[GhostMercury]

OOO man that is totally a sweet concept. So subing for this

 

[khaosman]

Cool man

 

[nazgul350r]

Good work! Are you going to share the maps after you are done with them? this gives me yet another reason to go with this system over others.

 

[kicker22705]

thanks. i'm pretty glad its working out well. hopefull everything stays well.

as of right now, i haven't really made any changes to the map for this. about the only thing i did was retard timing 15 degrees in the InpTiming and added some fuel. since i'm not creating a misfire to spool the turbo, i don't think a whole lot of tuning is required. this is a learning experience for me too, so i'll find out along the way.

 

[Maxx Mazda]

THe Haltech actually has a flat shift switch that basically puts it into anti-lag mode for you between shifts. pretty cool. Anti lag is VERY hard on the turbo, and should only be used momentarily. What are your EGT"s hitting? Mine were up to 1400* and 12psi by 3000RPM. My whole setup is ceramic coated and it glows red hot!