Manual Trans. Changes

[GhrarhG]

I noticed that compared to my stock code, the 8F code sucks with Stall Saver. I have seen that on  Third gen F-body Stall saver has an rpm which it cuts in and increases the IAC by a set amount. I cannot find this in the 8F code. Anyone know where that shows up in the XDF? I ffeel like it should show up under the Keep Alive header, but I cannot decipher some of the stuff listed under like:   

ISMNMPKA-ISMMPKAC DELTA THRESH TO ADJ ISMNMPKA.

WTF is that??

Also, it seems that the IAC motor decay at above 59 mph is very slow. I was reading on Thirdgen.org there are different filter coefficients based on speed. There is a definite break point at 59 mph for me. Above 59, the IAC will increase with TPS but decrease much more slowly, as in 1 step every 3 seconds which is wayyyyy to slow. I cannot find where this is in the XDF, anyone have any idea?

Thanks,

Jon

[flybynite]

Not sure what symptom you are trying to resolve but the THROTTLE FOLLOWER VS MPH is what I use to dial in the IAC.

[GhrarhG]

I am trying to resolve two seperate issues.

The first being that when if I let the clutch out and the car begins to struggle, i push the clutch in, and it just dies. The stall saver doesn't seem to kick in quickly enough. Basically with the original (88 non-turbo) code the IAC would open up quickly enough to save it. I was under the impression that with the f-body ecm, there was code called stall saver and you could adjust the amount of IAC steps and the rpm at which it kicked in. Is there a similar code in the 8F?

Second issue is that over 59 mph the IAC decay is very slow. This sounds very much like the code you describe. I just checked and saw that at 60 mph the decay rate is 0 msec. I will change this soon and compare.

Thanks,

Jon

[GhrarhG]

That throttle follower was exactly what I was looking at for the highway problem. Thank you very much Adam. It was so annoying to let off the throttle and have the IAC open so far that the car just kept going. Now the IAC returns as it should.

I found Stall Saver under DFCO, is there any potential to this? I just F-ed up my wideband so it may be a day or two before I can experiment.

[flybynite]

That throttle follower was exactly what I was looking at for the highway problem. Thank you very much Adam.

I found Stall Saver under DFCO, is there any potential to this? I just F-ed up my wideband so it may be a day or two before I can experiment.

Anytime Jon   :icon_mrgreen:
The delco fuel cut off can be tweaked but with little result, You mainly play with that stuff when you use larger injectors(36lbs or more) to keep from flooding the engine upon decel..  Good luck finishing up the tune.. Is that car boosted yet, Or is it still n/a?  later

[GhrarhG]

Oh, it's been boosted since late May. Overall it runs pretty well. The VE tables still need some work, just been so damn busy lately. I spent tonight fixing my WBO2 problem. This stall saver issue is bothering me though. after that drivability would be just about perfect.

In this car you can't let the clutch out at all without being on the gas, as soon as the rpm's dip it just dies and there's no saving it without stabbing the gas. The old code used to be able to recover. That's my last personal drivability issue.

[flybynite]

Have you tried adding steps in the 0-10mph area of throttle follower vs mph table yet???

[GhrarhG]

No I haven't. Do you mean the MAXIMUM THROTTLE FOLLOWER STEPS MULTIPLIER VS MPH table? If so, how do the Maximum steps tie in because it seems that I am exceeding those maximums.

[flybynite]

No I haven't. Do you mean the MAXIMUM THROTTLE FOLLOWER STEPS MULTIPLIER VS MPH table? If so, how do the Maximum steps tie in because it seems that I am exceeding those maximums.

Try adding some steps in the 0-10mph rang of the THROTTLE FOLLOWER VS MPH table. The address is DB1 and use can down load a hack from moates.net  What xdf/ecu file are you using, the one from 60degreev6 is pretty good and has worked well for others...

[GhrarhG]

I am using the 8F_v2 from Moates. 8F_v2 has that 0DB1 location listed as MAXIMUM THROTTLE FOLLOWER STEPS MULTIPLIER VS MPH and not just throttle follower. I did add some steps in the 0-10 range, but it didn't seem to have much effect. I'll make sure the changes took and try again.

[flybynite]

I am using the 8F_v2 from Moates.

I have found many flaws with that xdf. I'm sure that some have been fixed but I don't trust it... Get the one from 60 and never look back...   ;)   

[cobracmdr]

yeah version 1.2 on 60degreev6 is what we are using these days.  the v2 has the rev limiter all ass backwards and it will screw up your tune.

[GhrarhG]

I increased the steps from 0-10 but it seems there are other things to figure out. If i start the car when it's hot, the increase in steps are noticable, but if i start when the car is cold and let it warm up, the addition of steps does nothing or close to it.

[flybynite]

I increased the steps from 0-10 but it seems there are other things to figure out. If i start the car when it's hot, the increase in steps are noticable, but if i start when the car is cold and let it warm up, the addition of steps does nothing or close to it.

What is the symptom you are trying to resolve?  There is a constant IAC STEPS AT START UP adding to that will help with stalling upon start up...

[cobracmdr]

There is also a table for "IAC STEPS OFFSET AT STARTUP VS. COOLANT TEMP" which helped me tune my 3400 on cold startups I had a lot of idle surging when coming up to a stop but only when cold, when it was hot everything was fine.  Sounds like you might have the opposite problem?  Try scaling the table by a fixed percent at the hot temperatures.  Might help?

Ken