toyotanick

trying to do the supra maf swap on my 97 3.4 motor and am finding the my truck stays in open loop ALOT! it was idling for quite a while and never came out of open loop which makes it extremely difficult to tune this thing. any tips tricks or advise?!

waskillywabbit

iTrader: (-1)

Call URD.

:wabbit2:

MudHippy

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toyotanick

the problem is building a base map. you have to tune it in closed loop to get the truck to run properly and work your way up to open loop. my issue is that at the very beggening of my tuning session the truck was running in closed loop and was correcting its self at idle to keep its self around 14.7 where it should have been. now all of a sudden, the truck stays in open loop and my afrs at idle are rediculous and i cannot adjust my short term and long term trims in open.

MudHippy

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toyotanick

im sorry but no. there is a 30 page write up on tuning. you cannot start at open loop. trim levels on closed loop must be set. then you slowly adjust depending on manifold pressure to keep your trim levels as close to zero as possible throughout the entire pressure range. if done any other was you can quickly lean out and really screw something up. i am not trying to adjust afr's at closed loop, i am adjusting trim levels at open loop and trying to get to the point of open loop.

MudHippy

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toyotanick

That's exactly how it works. Spoke with gadget. My problem was that my base map was to low. Bumped it up a few and bam back to closed loop. I still need to move some fuel trim numbers around so that at normal driving the ecu isn't maxed out which is what I am seeing right now. Once the truck keeps that 14.7 afr and fuel trim is close to zero across the board the its time to start boosting for performance and to really see what this supra mass air flow sensor is going to do for me!

toyotanick

Wondering what you guys have seen at WOT as far as ignition advance. My trucks advance its staying mid twenties just cruising and 30 deg at WOT. Wondering what you guys have seen runs best?

cpizzle42

When you get it all figured it out, you should send me your map for me to play around with. I am having the same problem, truck stays in open loop at idle, maxing out the fuel trim, and throwing a p0172 rich code every now and then.

toyotanick

i can definatelly do that. your open loop because your cell values at idle are too low. bump them up ad tad a tad and the truck should go into closed loop again. im guessing you didnt take much time to tune it?

toyotanick

seem to have this figured out for the most part. as far as negative manifold pressures in relation to fuel trim, there seems to be only so much i can do. my biggest problem in gear selection. i am using 3rd and fourth and i am still seeing some random reslts in short term trim. for the most part it seems to be 6% either way but i randomly see 14's and cant really pin point where they are... also, since i am running methanol to cure my richness, i dont really have to do much tuning in the boost categories.

one problem that i have seen the entire time i have been using methanol. in low boost situations i am seeing low to mid 9's in afr's. high boost i seem to be lean. so later today i will be throwing my bigger nozzle in and turning my max setting up in hopes to subdue that low far richness and high afr lean. other than this truck seems to be running great. i am saying this because my clutch is slipping horribly!

cpizzle42

Yeah the tune from URD did not work very well at all. So I got a tune from a TTORA member. And it works pretty good. When I get on it, making full boost, i am in the low 11's on the AFR, but the think its retarding the timing too much(I can watch it on my scan gauge). I have tried the gay honda civic ricer fast and furious way of tuning with a laptop on the seat, watching gauges, and doing 3rd gear pulls. I really just need help from someone who has done it before.

toyotanick

haha im in the same boat man. learning as i go. luckily i have a friend that rides with me to be a second set of eyes for information. the problem is that i am running methanol so my in boost values are going to be different that what you need. my values are going to probably be much lower that you would need because methanol is picking up that portion of the spectrum.