surge problem please give advice......
surge problem please give advice...... hello...my mods are in sig. my car has been surging at a slow rolling idle...but when i get stopped it settles down. from 15mph down to stopped it surges. i am tuning with hp tuners. i just need to be pointed in the right direction. curious what the first thing you guys are adjusting for this...the second and so on.... please help as there are car shows and races coming up and i hate this surge when im cruising....its kinda dangerous in parking lots...car wants to jump forward....i know some of you have had this problem...pretty much anyone with a cam.......thanks again...
sure how should i send it...e-mail? or can i do it on here? never sent a file before on ls1 tech....if it is possible...?
Last edited by SlipMag; Nov 18, 2005 at 02:31 PM.
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TECH Apprentice
Joined: Oct 2004
Posts: 360
Likes: 0
From: Katy, TX
I replied via e-mail, but I'll post here as well just in case. Can you pull the tune from your car using an older version of HPTuners? They implemented a proprietary format in version 2. I am unable to view it from EFILive.
The throttle cracker is trying to jack up the engine
speed floor by an airflow offset. But you have a
throttle body on there which may not match the
IAC effective area curve built into the tune (table
for that). If your porting of the BBK included filling
IAC port (never seen one, don't know if it's like the
OE or not) you may need/want to enlarge the air
feed hole, too small a hole limits the IAC ability to
hit the goal and makes it swing wide, this can make
for yo-yo action.
Depending on what you know about the IAC passage
(and whether it's responsible) you might want to try
shifting the effective area table contents to the right
(need more IAC counts for airflow) or left (bigger than
stock passage) or clip it (very small passage, more IAC
does nothing).
On my tune I observe the throttle cracker is really
messy looking. Weird spikes in the table. I've never
messed with it myself but don't like the looks of it
much; lumpy table can make for notchy action as
you traverse it.
To share tables, probably best to just copy and
paste them right into your message text. Unfortunately
there is no "exchange format" other than plain text or
pasting into Excel (which I did once for the entire trans
side of things, but haven't been so motivated lately).
speed floor by an airflow offset. But you have a
throttle body on there which may not match the
IAC effective area curve built into the tune (table
for that). If your porting of the BBK included filling
IAC port (never seen one, don't know if it's like the
OE or not) you may need/want to enlarge the air
feed hole, too small a hole limits the IAC ability to
hit the goal and makes it swing wide, this can make
for yo-yo action.
Depending on what you know about the IAC passage
(and whether it's responsible) you might want to try
shifting the effective area table contents to the right
(need more IAC counts for airflow) or left (bigger than
stock passage) or clip it (very small passage, more IAC
does nothing).
On my tune I observe the throttle cracker is really
messy looking. Weird spikes in the table. I've never
messed with it myself but don't like the looks of it
much; lumpy table can make for notchy action as
you traverse it.
To share tables, probably best to just copy and
paste them right into your message text. Unfortunately
there is no "exchange format" other than plain text or
pasting into Excel (which I did once for the entire trans
side of things, but haven't been so motivated lately).
well would you like to take a look at it? please help.... i am about to swap out the tranny and would prefer for this to be fixed first. my tb is a stock ported so the iac passage is fine....havent drilled the blade...i was hoping not to....
my throttle cracker....
0.00000 0.00000 0.23730 0.70898 0.94629 0.94629 0.94629 0.94629 0.94629 0.94629 0.94629 0.94629
0.35449 0.47363 0.70898 0.94629 1.18359 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.47363 0.76953 1.06543 1.18359 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.59180 0.82813 1.06543 1.18359 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.59180 0.82813 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.59180 0.94629 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.59180 0.65039 0.94629 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.59180 0.70898 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.70898 0.76953 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.76953 0.76953 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 0.94629 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
1.06543 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
1.06543 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
1.06543 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.00000 0.00000 0.23730 0.70898 0.94629 0.94629 0.94629 0.94629 0.94629 0.94629 0.94629 0.94629
0.35449 0.47363 0.70898 0.94629 1.18359 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.47363 0.76953 1.06543 1.18359 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.59180 0.82813 1.06543 1.18359 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.59180 0.82813 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.47363 0.59180 0.94629 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.59180 0.65039 0.94629 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.59180 0.70898 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.70898 0.76953 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.76953 0.76953 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 0.94629 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
0.88770 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
1.06543 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
1.06543 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
1.06543 1.06543 1.06543 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961 1.59961
TECH Apprentice
Joined: Oct 2004
Posts: 360
Likes: 0
From: Katy, TX
I've zeroed out my throttle cracker (I don't need my IAC whatsoever) and use the spark tables to smooth everything out. Do you have any type of live control? I would see see where it idles at spark wise then tweak your tables for over and under speed error. Tighter values will keep it from swinging and hunting so much. There is more than one way to skin a cat. 