BronYrAur

iTrader: (1)

Hey, those of you tuners using highway mode. You think you could give me a breakdown of what you're using for it. I'm not sure where I should put my AFR's at or around and if I should put some spark advance in. Also, there's a "Highway mode speed threshold" and a "Highway mode min mph threshold" Would the latter be the speed it turns on and the first the speed it turns off again, or what? Thanks for any help, I'm sure jon prevost knows the last question for sure, considering he wrote the ecu. Thanks guys.

dimented24x7

iTrader: (2)

Never used highway mode as I didnt have a WB O2 to get the AFRs right. I never really trusted using the tuning done with the narrowband O2 alone.

As far as teh thresholds.

For both HW fuel and spark there is a manifold vacuum and temperature threshold for both to be active

HW mode fuel and spark both have seperate thresholds:

HW mode fuel has a min mph threshold and a threshold for the CCP.

HW mode spark has its own mph threshold as well.

Check and make sure which is which if you decide to change anything.

As for teh AFRs, id say probably somewhere around 15-16:1. Youll want to experiment a bit to see what works best for you. I was thinking maybe one could use the injector pulsewidth plotted against speed each time ones trying out different values to get some idea of how much fuel is going out the door. Lower pulsewidth at a given speed should equate to less fuel usage. Youd have to be cruising along in OD with the torque converter locked with similar conditions outside each time you test/tune. If not your results wont have much meaning.

BronYrAur

iTrader: (1)

Interesting stuff. Thanks for the insight Dimented, I figure my AFR's are probably fairly accurate since my motor is still fairly stock and I'm running 128 BLM's. I haven't been able to tune it much down here at school though, I'm still getting some knock on tip in so I need to mess with pump shot. But, when I'm doing a lot of highway driving and getting about 15mpg on the highway, I figure this is a big concern. I used to get around 28 on the highway then after the intake, headers, and gears it went down the toilet.

Well, I guess I'll just kinda mess around with it a bit for a while and see where it takes me.

Dewey316

I'll have to check all the values on mine, but off hte top of my head... I have the MPH threshold set to about 52mph (I either drive like a grandpa, or I drive it like I stole it. so 52 means in grandpa mode, it gets activated on the freeway.) My AFRs are about 16.2 with a descent amount of spark, be carefull, and make sure you watch it, going that lean, with lots of spark, you can get into knock pretty easy. Each car will be diffrent, so make sure to datalog in highway mode, and make sure you aren't knocking.

BronYrAur

iTrader: (1)

Thanks Dewey. I'm using the AXKW .bin modified. Do you know if highway mode is disabled from the factory in this cal? What makes me think this is that the 2 thresholds listed "Highway mode speed threshold" and "Highway min mph threshold" are both constants and are both set at 52mph in the bin. My thinking is either it comes on at 52mph or that the min mph threshold would kick it on at 52mph and the other threshold would turn it off at 52 mph so it is essentially never coming on. But, it seems like if they were to turn it off they'd pick a different speed than 52. That's what's bringing some confusion into this.

Also, the HW spark advance stock is 0* from 10kpa to 40kpa and then 2.11* at 50kpa and that's the end of the table. I'm sure it can take quite a bit more than that to be effective. I'll datalog on the highway and see how it runs, finally this Prominator may be useful.

BronYrAur

iTrader: (1)

Just noticed that there's a "highway mode load threshold" and it's set at 98.91 Kpa. What would be a good cruising load to set this at?

dimented24x7

iTrader: (2)

That threshold is actually in terms of vacuum. IIRC, the conversion to kPa of vacuum is .313 x (256 - raw value). Id set it to like 30 kPa of vacuum so it doesnt stay in HW mode when you go to accelerate. I never really liked the thought of running lean at moderate loads and I dont know why they have it set so high.

BronYrAur

iTrader: (1)

Cool, thanks dimented. Man I have to get back into this stuff, I haven't looked through a bin in a while, there's some cool stuff to mess with.