Another_User

If anybody wants to take a look at my tune and give me any feedback, Horist approved it on his site. I regret that some of the weak-@ss "pro" tuners will also have access to it (one in particular has been trying to weasel it out of me for a long time), but it is better that everyone can access it.

HumpinSS

iTrader: (1)

Nice smooth ve table...

How come you added so much timing to the base spark in park and drive tables????


Did that help that much with the surging and the bucking

What was th logic behind making these your R/L switch points

Another_User

I smoothed a lot of the VE table after my last STFT run using the built in smoothing tool, and making sure it didn't change the values much. The base timing helped smooth out my idle a lot, so I increased the entire rows to keep everything uniform. The switch points are stock...but I have been wondering why they are like that. I have compared those switch points with quite a few years, and they are the only year that does that. But there are quite a few differences in the other stock tables, so I felt that they should be left alone for now.

As for the surging, I was trying to tune it out with spark, airflow, etc. No help, but disabling proportional idle fixed the surging and bucking (so far). It definitely added more fuel add idle, and the PCM considered anything below 5% TPS idle territory. It was affecting my trims badly. The bucking and surging is definitely being caused by a lean condition. I noticed with LTFTs disabled I would occasionally get a surge until the STFTs stabilized in that cell, so low-rpm/high vacuum is definitely very sensitive to fueling problems. I have been trying to convince somebody else to verify my results, but nobody has posted any results.

HumpinSS

iTrader: (1)

I turned off the idle porportional thing and it didnt seem to make a difference, but i also think its because i am not waiting long enough before flashes (letting the car learn the new idle settings/changes)

GrannySShifting

iTrader: (10)

Dirk when are you going to drag that car up here so I cna try getting it back running with the MAF

2000Firehawk

iTrader: (248)

ANOTHER_USER

What AFR did you setup your VE table for ?

Dave

Another_User

What do you mean? It was tuned using narrowband O2s and STFTs. It's actually kind of a work in progress. As I watch how the trims work I update it a little at a time. I tuned my PE at WOT to put the O2 readings as lean as I felt comfortable with.

2000Firehawk

iTrader: (248)

Hello,

I've only had my HPTuner a week, so I have
a lot to learn...

Heard of 2 ways to set up VE -

Narrowband/STFT = like you are doing.
Wideband = setting up VE table for 13.0 AFR.

Maybe I'll try both...

Dave

Pavetim

iTrader: (15)

I have a wideband and am getting pretty close to 13.0 but damn just seen i did not set my PE values to 1.0 so guess I have to start over now LOL.

TAQuickness

iTrader: (28)

You should tune the car for the desired AFR under non-tuning conditions... In otherwords, if when you are done tuning you want to have a 14.6:1 AFR, you should do all your tuning for the 14.6:1 AFR not 13.0:1....

ringram

Yep agreed, otherwise your closed loop ltft are going to be way -ve taking the fuel out to get to stoich at all points except PE. No need to fight closed loop, work with it unless you have reason to turn it off.

Pavetim

iTrader: (15)

I"m not understanding you. Why would you tune the car for stoich when about 12.8-13 makes the best power. And what do you mean tune the car under non-tuning conditions. Maybe i'm dumb but that just threw me way off.

MrDude_1

iTrader: (4)

you tune the car to be at stoich when driving around... you know 99% of driving.

the power enrichment table then adds the fuel to make it 13.0 at WOT...

you dont want to be that rich all the time...

Bombguy99z28

Yes, you need to understand the difference between part throttle driving and full throttle tuning.

I'm not sure why people are talking about tuning part throttle to 13.0 AFR, that isn't a very good idea or even very attainable. I have heard of people tuning part throttle to like 15.4:1, but the only way you can really change your part throttle AFR is to adjust your switch points on your o2s so they don't oscillate so much in a certain direction.

Now, if you disable your o2s and run open-loop all the time, yes, you could command any AFR you want to at any time.

Blown Interceptor

iTrader: (5)

I know its not a good idea to copy files, but I copied your timing tables in drive and park to try to take care of my bucking problem...it worked.