RomRaider

I'd definitely be interested. If you have time to throw something together let me know. I'm on the SD map right now, so the switch should be fairly effortless.

-Mark

Im going to focus on getting some of the other features finished first. But this does interest me as I run e85 in my subie. Really you wouldn't need the zeitronix gauge. You would just need to go to your local junkyard, grab a flex-fuel sensor, and then wire it up to the TGV sensor wires(3 wires I believe). Logging of the ethanol content would be possible as well.

I think I would set it up like this. The ethanol sensor output would act as an automatic map switch and also a fuel modifier. There would be an upper and lower boundary, if less than the lower the ecu would default to 100% pump gas map and disregard ethanol content. If more than the upper the ecu would default to 100% e85 map and disregard ethanol content. If between the lower and upper the ecu would run the pump gas map but apply a multiplier to the "fuel injector scaler" as well as the cranking/warm-up/tip-in enrichments. The multiplier would be looked up from a table based on the ethanol sensor's output. The table could have ~8 points of adjustment to tune various percentages of ethanol content. So basically when properly tuned, fuel would always be correct no matter what percent of ethanol. But timing would come from the pump gas map until the ethanol content exceeds the upper boundary and then it would use timing from the e85 map.


Do you have an ethanol sensor installed in your car?

The map switching would basically be duplicate tables of all the required tables for tuning. Then a switch would determine which tables the ecu pulls its values from, it would literally be instant and could be done with the car running.

I do not have a sensor currently, but I have been looking at getting one for some time.
I understand that the other modifications are more important, so if you need a beta tester for those let me know too. I've got a daily driver if something goes wrong!

Is there an idle air control valve that the ECU can hold open to get more air through the motor during rotational idle?

On my JDM, solely using the Idle air control valve at 95% or thereabouts with the throttle position volts at the stock 0.58Volts. Note the idle sensing in the ecu needs to be activated before the antilag comes on, usually at or below 0.7volts.

Unfortunately the stock IACV will not give enough air to give any meaningful anti-lag

True, but having used this map both in rally and on the street, it gives me all the antilag I need

http://www.youtube.com/watch?v=yR9BOddkDII

hehe,cant believe i will have something like this on stock ECU

Yeah, amazing work people have put in this rom, my thanks to you all. Experimented with the same car, but a bit more fuel on throttle lift off and it was mayhem to say the least

Any chance one of those tgv inputs could be used with the analog(0-5v) output of a wideband? Im thinking a voltage could be set in the ecu to cut wastegate duty to zero if it goes lean over a certain load. Evo ecu is defined as drop boost on afr out of range.

The possibilities are endless for what the inputs could be used to do, its just a matter of writing the code. Unfortunately I do not have the skills to do that, or have the time to learn at this point.

The rom actually does this already when anti-lag is active but its not quite enough airflow to make a big difference. I even tried disconnecting the brake booster line to create a large vacuum leak and it still couldn't flow enough air. This is where DBW would be nice.

I need to figure out a better logic scheme for rotational idle, ive done some testing with various setups and im not 100% happy with the effect. I think I need to make it more of a "random miss" as I currently have it set up to "cut x injections from y events" and no matter what configuration I use it doesn't really emulate what ive observed in rally cars.

What is rotational idle exactly?

Cars with antilag have large throttle openings. The ignition is cut in a rotational pattern between the cylinders in order for the car to idle at a reasonable rpm.