matyb

iTrader: (1)

no, no, no, i understand how an als works, i worked for two different rally teams, i know of using DV air as your means of o2 for the mixture. i was asking how an actual air pump is used. i am picturing something like a secondary air pump but i dont see how that could be fast enough??? unless the "secondary air" is cvonstant.

that was more so a question emphasizing on the PUMP

but thanks for the tutorial well explained :thumbup

Ralph

iTrader: (19)

Nice dude

iTune

iTrader: (3)

is there a way we can use the JDM and UK anti-lag areas of the ROM and maybe migrate those into other ROMs? If so, and we could figure out how to use them.....we could alter ignition timing and fuel completly seperate from the main fuel and ignition tables....this would enable control over injector over-run, and ignition retard...along with on-off settings. That would be a really cool feature to work on if it were possible.

I will pitch the idea if you guys think you would use it. ( i know i would).

CJ

Vigman

How it works, danger and goodies...
Take a look here:
http://en.wikipedia.org/wiki/Anti-Lag_System
http://www.rallycars.com/Cars/bangbang.html
http://www.halfbakery.com/idea/Steam...o-Lag_20System
http://www.autronic.com/technical_da...es/antilag.pdf
Cheers.

iTune

iTrader: (3)

i'm fully aware of what a ALS system is, and it's advantages, and disadvantages..... but this would be a good read for anybody wanting to learn more.

What i am attempting to do is actually very mild. It has the ability to spool the turbo, but is using as little ignition retard as possible. Currently, it's not very effective at all unless we can adapt the factory antilag parameters to a ECU that is running a USDM engine with no ALS hardware.

Thanks for posting that up for them!

CJ

Vigman

Sounds great but I think it might need a low level reprograming of the ECU. May be trying to combine TPS, Accel desenrichment with ignition map to induce retard when throttle is quickly dropped off. I do not think you will be able to do a lot more with stock ECU but it's a very interresting subject. Anyone with stock ECU internal diagram, addresses, specs and algoritms will be very appreciated :-)

iTune

iTrader: (3)

The UK and JDM ROMs already have all we need to implement a anti-lag set-up already. The USDM ROMs might have these features already, we might not have found it yet. The only difference is, we would need to alter these parameters to have a software ALS, with no hardware. It's done all the time with standalones and is effective if you can over-run the injectors and retard ignition timing negative 10-15*. Using the JDM and UK roms would allow us to do this, we will just have to be creative on how we can set it up.

CJ

iTune

iTrader: (3)

Some help from Bez and the guys would be needed though. I'm sure if there was enough interest, they would be willing to help.

CJ

C6C6CH3vo

iTrader: (9)

Closed loop indeed, while in 3rd between 2200rpm to 3000 rpm with foot on brake to apply slight load for about 50% I noticed my AFR would climb to 16:1. It wasn't until yesterday that I bothered adding the addresses to those enlean/enrich and timing maps to see what they are. And now I know.

I just rescaled the map to the load/rpm scale I changed for the main fuel/timing maps.

I have a strange suspision that these antilag maps are the cause of my low load knock.

iTune

iTrader: (3)

did you happen to datalog this anamoly? Do you often log AFRs in the 16's at these same conditions(normal street part throttle drving)? What load column were you hitting when this happend?

Thanks.

CJ

C6C6CH3vo

iTrader: (9)

I will edit this post with a shot of the log

jcsbanks

From emails from "gunzo" it seems that these maps lean out closed loop but the fuel trim eventually reverses the effect. I could understand if it left closed loop and went leaner on prolonged throttle, but why go leaner just for the closed loop control to correct it again. Makes no sense to me yet.

C6C6CH3vo

iTrader: (9)

When it makes no sense to us then it probably makes sense to EPA - my guess it's for emissions

C6C6CH3vo

iTrader: (9)

It went into the lean mode, jumped out back into stoich and I added a little throttle and it went back into lean mode again

C6C6CH3vo

iTrader: (9)

One more thing - why doesn't JDM VIII have an address for adv/ret:

- <table name="Boost Enhancement Adv/Ret Map 1 (Anti-lag)" category="Timing" (no address)type="3D" level="1" swapxy="true" scaling="Timing">
<table name="Load" address="57d6" type="X Axis" elements="19" scaling="Load" />
<table name="RPM" address="57a6" type="Y Axis" elements="20" scaling="RPM" />
</table>
- <table name="Boost Enhancement Adv/Ret Map 2 (Anti-lag)" category="Timing" (no address)type="3D" level="1" swapxy="true" scaling="Timing">
<table name="Load" address="57d6" type="X Axis" elements="19" scaling="Load" />
<table name="RPM" address="57a6" type="Y Axis" elements="20" scaling="RPM" />


Also, BE table is 4000 - 7000 RPM (RPMStatLimit) for the JDM but mine is set to like 500 - 800 RPM (RPMStatLimit)

I'm sure the JDM has antilag plumbing but does it have a different turbo, even head?