EFIDynoTuning Forum

what is the purpose of this function? I have never made any changes to it because reading the description it says its only used if the MAF has failed and its not mentioned in any of the write-ups so i've always thought it has little importance. I've saw it mentioned on the forums for other strats so its got me wondering lately.

I would just dial it in without the above question using the histogram but its seems like its giving me unrealistic correction multipliers? if the corrections are indeed incorrect any idea why?

Is there anything wrong with leaving this way? I thought you said earlier it should be in OL for dfso?

I thought it was literally perfect yesterday. I could downshift and decel all I wanted and when I got back on the pedal or clutched in to a stop it was immediately back to stoich and when clutched in the rpm’s dropped perfectly to idle and didn’t overshoot.

When in CL on decel it yanks the fuel so the WB reads lean which then makes the computer ramp rich. Changing the airmass correction table previously trying to help this did nothing?

*edited original first post as wording may have been misleading*

well I was able to log some miles and fn338 has done the trick! found my sweet spot to be .17 load

as always thanks for the help!!

Ok thanks for that info. I’ll lower it to that and give it a shot

got tunerpro setup, hows this one?

edited last post and added to it

decipha wrote: ↑2022 Jun 14, 11:45 in dfso it will be in open loop so it wont ramp at all

for now your best bet is to set fn338 to force open loop on decel at those rpms and then you can very easily dial in the decel correction table

make sure the decel table is set to be used at closed throttle at wot only.

I'm not 100% sure how to setup fn338, does this look ok?
Looking into this more did I go the wrong way with load? Found where this is touched on in the write-ups and it reads that the load should be higher so OL is for below that load. I am also not sure if there is a reason to have different loads at different rpms? I think I want it to go into OL all the time on decel which is why I put the same load in all columns.

I am not sure on how to verify if the decel table is set for CT and WOT only. I am using the latest files so is it setup that way to start or is there something that needs to be changed to make this happen?

I was able to drive it a bit yesterday and unfortunately it doesnt seem anything I have tried has helped.

The thing I am confused on is if its going into DFSO should the lambses continue to ramp rich? It seems like this is counterintuitive of the point of DFSO which is fuel savings. I decel'd and downshifted from 4th to 2nd coming to a light yesterday and the lambses ramped all the way to .75 and when I clutched in it started to surge pretty bad, and I am pretty sure the lambses were stuck there while the surging continued.

Ok thanks for checking back in on this. The description on this one is very thorough and reads like it’s exactly what I need but I really don’t think it’s doing anything to help. I’ll keep at it and see if I can figure something out

thanks for the suggestions. theres manifold slow fill and fast fill but no volume or VE correction. ive messed with the manifold fills in the past and dont think they did much. the MAF backflow correction description sounds like it should take care of this but I went as far as cutting the numbers in half and it didnt help.

I just found DNPPM(declutch dashpot) that sounds like it could help so I'll give that a shot next.