Yet another Accel question

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devastator
Experienced Squirter
Posts: 333
Joined: Mon Feb 11, 2008 10:19 am
Location: Kinda near Tucson Arizona

Yet another Accel question

Post by devastator »

After almost 2 years I am still having Accel issues so I have a new question. Can someone with a well functioning Accel table, look at their datalog and tell me some reasonable PW value increases for successful Accel? I think I am not adding enough fuel during Accel, but have been told that I am adding too much. I know how to change the table values for different pedal depression speeds etc, but do not know how much fuel, roughly, to add. Even a % value would be fine, I can calculate it from there. Currently, my PW almost doubles during Accel, but the WB02 reads lean thereafter, maybe due to a backfire which happens every time I Accel. I've tried so many Accel configurations and values that I have lost any resemblance to the original values.
Thanks ahead of time.
Dev
Sandrail-ACVW 2276 cc, Turbo
MS-II W/spark burning E85
The sand must be punished. :twisted:
sawnuoff
MegaSquirt Newbie
Posts: 5
Joined: Mon Oct 20, 2008 8:24 am

Re: Yet another Accel question

Post by sawnuoff »

After looking at my latest datalog at cruising at 2500-3000 my pulse width are around 3.4, but then as I give it a little more gas the pw rises at a steady increase up to 11.4 , then when i pressed the pedal all the way down it peaked and flatlined for only a split second then steadily rose to 19.8. I am running off 100% map not tps for accel wizard. I was thinking that the pw values kinda went by your ve table.
Her are what my map based setting are
8.0---400
2.0---175
1.0---100
.8-----50
mapthreshold is 50
accel time .2
accel taper .3
end pulsewidth 1.0
I have a turbo car now so those maybe a little rich for you unless your turbo. Hope these can help you a little,
devastator
Experienced Squirter
Posts: 333
Joined: Mon Feb 11, 2008 10:19 am
Location: Kinda near Tucson Arizona

Re: Yet another Accel question

Post by devastator »

Thanks sawnuoff,
I am running a turbo in fact. Were the posted values from the turbo car? My VE table is tuned in very well so I should just be able to add/subtract PW, (with the Accel values), to get a normal acceleration when I press the pedal.
sawnuoff wrote:but then as I give it a little more gas the pw rises at a steady increase up to 11.4
Can you tell me the PW during the Accel event? I've been trying to tune this like a carb, (using the Accel in order to overcome the loss of vacuum when you open the throttle plates), and I think I might be a little off base there as my injectors are only 2" from the valves not and spraying fuel inside instead of pulling it in. How does MAP based accel work for you with a turbo?
Sandrail-ACVW 2276 cc, Turbo
MS-II W/spark burning E85
The sand must be punished. :twisted:
sawnuoff
MegaSquirt Newbie
Posts: 5
Joined: Mon Oct 20, 2008 8:24 am

Re: Yet another Accel question

Post by sawnuoff »

Looking at some other logs it looks like the PW will go from 1.-5-1.8 at 0 TPS and then when I stab the throttle it will jump up to 8.8 flatline for a split second and then jump up to 16. This all happened in the amount of time it took to hit full boost. I was looking at the log between shifts.
I have really been able to find any from a take off, they were all kinda rolling starts. Another thing also full boost for me is around 18 psi peak but I have been troubled with a boost controller problems so it will drop and hold at 15-16.
Yes those are from my car which is boosted.
And I am also running N2O now using MS and it is freaking great :D. Doing a dry shot in my intercooler pipe and using MS to know when its activated and shooting extra fuel threw my injectors so it seems like a wet kit. It works perfect the stock MS setting are very conservative but was a safe starting piont.
In the previous post my numbers are from the map side of the acel wizard so the lower numbers are the PW value added at that vacum or boost. I will get you a datalog of what going on now because the only thing I have is pre map base I believe. I Have it on my friends laptop, give me a day or so I will get him to email to me so I can post it for you.

My injectores are basically in the same place they might be 2 inches from the valves. I like the map base just fine may have seem to be a little easier to drive in town as far as shifting smoother but mine seems to respond a little better to the map for my tuning needs.
devastator
Experienced Squirter
Posts: 333
Joined: Mon Feb 11, 2008 10:19 am
Location: Kinda near Tucson Arizona

Re: Yet another Accel question

Post by devastator »

Thanks again sawnuoff,
This is the info I was looking for. 2 days ago I added an accumulator to my MAP line, (between the intake manifold and the MS controller). This has smoothed my MAP signal out so that I can now use MAP based Accel, which I'll be testing soon. I still have not figured out what is wrong with my TPS signal, but I'm working on it.
Sandrail-ACVW 2276 cc, Turbo
MS-II W/spark burning E85
The sand must be punished. :twisted:
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