how to set decel fuel cut?

Bindegal · Post by **Bindegal** » Sun Mar 15, 2009 6:31 pm

CanÂ´t say IÂ´m having any problems with it at all. I just set fuel cut below X mbar a little higher until popping stops. (IÂ´m assuming we all mean \"popping\" and not \"pooping\" here, that second word has an entirely different meaning

) Even with popping though, I donÂ´t see how the engine should take any damage? /Allan

Post by **Bugermass** » Mon Mar 16, 2009 12:17 am

I've never had any issues with fuelcut.. You guys must be doing somthing wrong.. I never have to adjust the columbs 1 & 2 either, Or the tipout. All you need to do is set TPS threashold to 0% then drive up to like 5K and let off the gas and see what your max decel mbar is... Then set your decel fuelcut a little above that value so if your decel mbar is 198, set fuel cut to like 210-220 or untill you get a solid decel. I always do it like this and never have any issues.

Post by **Bugermass** » Mon Mar 16, 2009 12:20 am

Make sure your TPS threashold is at 0% and your TPS is calibrated properly.

Adam Hopkins · Post by **Adam Hopkins** » Mon Mar 16, 2009 1:20 am

You may be forgetting about the land in which we tune on. In Texas it is a little flatter than it is here in Tennessee. Different grades make the mbar necessary for fuel cut change. JD and I personally played with this in the hills of NC and could not get it exactly where we wanted it. We finally got it to act correctly about 90% of the time and left it at that. Do you think that is what is giving us inconsistent results. Im just thinking out loud.

Post by **Bugermass** » Mon Mar 16, 2009 1:28 am

I can see where that may be an issue.. Do you have a baro sensor?? This may be a good reason for calvin to write some code for baro compensations.. That would probably solve your issue. Mabey a multiplier that globally offsets all values based on mbar depending on the baro readings .. The WRXs have tons of baro based comp tables for stuff.. Just an idea.. Actually the tables should already be there from honda. Mabey its just matter of finding them and making sure they apply correctly with all the none honda code that calvin has written.

Adam Hopkins · Post by **Adam Hopkins** » Mon Mar 16, 2009 1:54 am

My idea is fuel cut at 0% throttle and above \"X\" RPM. Maybe leave the tps and rpm adjustable. Thoughts, Suggestions?

Post by **Bugermass** » Mon Mar 16, 2009 1:56 am

yeah, that may be the simplest way to do it.. Then you don't have to mess with baro stuff.

racepak · Post by **racepak** » Mon Mar 16, 2009 4:26 am

Adam Hopkins wrote:My idea is fuel cut at 0% throttle and above "X" RPM. Maybe leave the tps and rpm adjustable. Thoughts, Suggestions?

yeah. thats exactly how real ems systems like haltech work. it may also be a good feature for the ITB guys.

greasemonkee · Post by **greasemonkee** » Mon Mar 16, 2009 10:27 am

This is what I asked for 5 months ago. Why only now are people disgruntled over the current config?

Adam Hopkins · Post by **Adam Hopkins** » Mon Mar 16, 2009 10:38 am

Other things take priority, Calvin is only one man and he only has 24 hours in a day like the rest of us.

Post by **Bugermass** » Mon Mar 16, 2009 11:32 am

I have actually talked with calvin about fuel cut a few times before because the mbar value was not affecting anything, he already fixed that several rom versions ago, but I guess theres more to it than what we talked about..

racepak · Post by **racepak** » Mon Mar 16, 2009 5:01 pm

Adam Hopkins wrote:Other things take priority, Calvin is only one man and he only has 24 hours in a day like the rest of us.

whats more importent then normal driving?

Adam Hopkins · Post by **Adam Hopkins** » Mon Mar 16, 2009 5:11 pm

You mean whats more important than a little extra fuel during deceleration? I don't know, A stable code base, correct tip in, steady injector latency tables, gpos functioning correctly when BIG shots of nitrous are being used, ITB tools, Accurate dataloggs, Correct injector multipliers, Final timing actually being what the timing values shoud be....... just to name a few.

elevation · Post by **elevation** » Tue Mar 17, 2009 1:24 pm

I always add a column between the first and second (Just the way I do it) Also the if the A/F is 14 to 16 in the place your jumping in and out of fuel cut the feeling is less dramatic than say if it were 12 or 11.

racepak · Post by **racepak** » Tue Mar 17, 2009 2:51 pm

Adam Hopkins wrote:You mean whats more important than a little extra fuel during deceleration? I don't know, A stable code base, correct tip in, steady injector latency tables, gpos functioning correctly when BIG shots of nitrous are being used, ITB tools, Accurate dataloggs, Correct injector multipliers, Final timing actually being what the timing values shoud be....... just to name a few.

most of the stuff you mentiond suppouse to be there, i.e stable code inj tables and correct ignition ect.(not saying that it isnt,) but this option is importent as others, i can post a video showing you guys how crappy it is to drive like this,