tip-in and fuel problems

xenocron · Post by **xenocron** » Fri Apr 04, 2008 9:29 am

calvin wrote: Try this... Adjust the whole fuel map with a percentage until you have a proper idle. Tune from there see if you still have a lean condition on tipin or how the tipin is without adjusting.

Elaborate on this please...I don't thoroughly understand what you asking us to do from your explanation. I have a retune and a new tune today and will try it...

Post by **calvin** » Fri Apr 04, 2008 2:24 pm

Instead of using an offset just use overall fuel trim to get afr right on startup. Or select the whole map and increase with % to get afr right

spdweb.net · Post by **spdweb.net** » Fri Apr 04, 2008 10:42 pm

I did some runs today and am happy to report that I have the problem almost entirely under control. First I set the fuel cut delay to 800ms. I also set the tip-in to 5%. In order to get no stumble from part throttle to 100% during low rpm the tip-in seems to work best around 20 - 40% but this causes breakup during shifting.. I lowered the tip-in down to 5% which works great during high rpm shifting but I get breakup punching it from part throttle to 100% WOT.. This is no big deal to me though as there really is no reason to be doing this. If anyone is interested in picking through my logs here they are. The jpg is a snapshot of the LM-1 o2 log. It shows the lean spike during part throttle to full throttle which only lasts about 200ms at its peak. enough to make the car misfire once or twice. For some reason the ectune logs do not pick this up. I think this is due to my out put refresh rate on the lm-1 unit. If I would have thought about it I would have it set higher before I logged. I am happy with the way things are now. Thanks for everyones input. Unfortunately I broke a ball joint on my last run so thats it for a few days.

xenocron · Post by **xenocron** » Sun Apr 06, 2008 11:54 am

calvin wrote:Instead of using an offset just use overall fuel trim to get afr right on startup. Or select the whole map and increase with % to get afr right

Had a car with stock map, rc 440 boosted with no multiplier and no offset used (battery tables were altered) and the lean spot wasnt noticable that I could see. it was raining though so we couldnt take the car out on the street for a road test.

Post by **calvin** » Sun Apr 06, 2008 1:09 pm

no multiplier no offset? You need multiplier for bigger injector how did you compensate? Only in the battery offset table?

xenocron · Post by **xenocron** » Sun Apr 06, 2008 9:42 pm

I'm sorry...no overall FUEL TRIM change

Post by **calvin** » Mon Apr 07, 2008 7:24 am

so correct me. Multiplier for bigger injector. You didn't add a % to the maps You didn't use overall trim You didn't use offset You increase battery table What is the result

xenocron · Post by **xenocron** » Tue Apr 08, 2008 8:36 am

Original Map was a boosted car with RC 550 injectors I tuned ages ago. Multiplier for bigger injectors No overall trim, no Offset added or removed Battery tables were modified, increased Car was tuned. Similar car came in last week, but had RC 440 injectors. So I rescaled and retuned...

Post by **calvin** » Tue Apr 08, 2008 1:19 pm

what was the result regarding TPS TIPIN that is what we are testing right?

xenocron · Post by **xenocron** » Tue Apr 08, 2008 1:35 pm

I didnt notice the issue on the dyno...but we couldnt drive on the street and do some hard pulls because it was raining that day, so unfortunately an incomplete test. I would love to try to do this on my own car, but that would nearly require a complete retune...and I dont have that kind of time right now...my trans sucks balls so I can barely shift anyways and I'm getting 25mpg - 35mpg which is why I am driving my turbo car rather than the Pilot lately

Post by **calvin** » Tue Apr 08, 2008 1:38 pm

can u try next time to work with a overall trim only?

Post by **calvin** » Tue Apr 08, 2008 1:42 pm

as soon as i have to tune a next car i'll try. I think a solution to this all is close by what do u think?

Post by **calvin** » Wed Apr 09, 2008 3:09 pm

i'm open i would like to know tis asap. Xenocron what about if i make u a bin where i move the offset after battery lookup. Same as what you did by adding to the bat table

Post by **Gaskleppie** » Sat Apr 12, 2008 1:31 am

Instead of using an offset just use overall fuel trim to get afr right on startup. Or select the whole map and increase with % to get afr right

considering this, maybe it is better to change the Injector tool. The big plus and minus is now changing the offset and not the overall fuel trim. Maybe do both in this tool screen? So 2 sets of buttons 1 for the offset, and 1 for the overall%?

Post by **calvin** » Sat Apr 12, 2008 8:53 am

I moved the offset to somewhere else. Care to test?