Anyone with HP tuners...need your help
Thread Starter
12 Second Club
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Joined: Jul 2005
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From: central coast, cali
Anyone with HP tuners...need your help I just had a cam installed along with long tube headers and a off road y pipe. My car is a 98 ls1 camaro A4. The cam i had installed was a 224/224 561 lift with a 112 lsa. Me and my buddies are having trouble tunning the car. The idle seems to be to high. Its idle is around 1100 rpms and when im cruising it doesnt go any lower than 1400 rpms until i come to a complete stop, then it goes back down to 1100 rpms. Also, when im cruising, it sputters. It seems like it wants to go and then die, and then go and die. If anybody has hp tuners for a 98 ls1 camaro and knows how to tune a car with my setup, or has already done a setup like mine, can you please send me the .bin file to my email address which is mrbustamove2003@yahoo.com. I really would appreciate it, thanks.
Sounds like you have an air leak on the intake side,
that is offsetting the idle and the throttle-cracker
airflows to the high side. Look at the IAC position
at idle, if it's 0 and you're still above the set idle RPM
target then go find the vac leak.
With a significant air leak you may see the proportional
fuel swing (that forces the O2s to switch) take you
too far into the lean and make you stumble. Check if
this is the deal, by raising the closed loop enable
temperature (and get the fueling so it's roughly right
at the cruise areas where you see the sputter) and
see if the "bouncing" goes away. The yo-yo action
could also be the O2s just being sleepy from the
headers and confused from the shoot-through air
that the low-LSA cam lets into the exhaust, maybe
destabilizing that loop even more than before). If
you can see a somewhat consistent "beat time" in
this sputter deal, then look at your log files for any
of the key params (esp the O2 waveforms, the
STFT and LTFT values, injector PW - things to do
with fuel - and look for the ones that bounce at the
same rate (times 10 frames / sec on the chart). To
dope out which are cause and which, effect will be
the next layer of the puzzle but at least it'll be a
clue or three.
But the air leak deal seems pretty plain and might
just clear up the rest.
that is offsetting the idle and the throttle-cracker
airflows to the high side. Look at the IAC position
at idle, if it's 0 and you're still above the set idle RPM
target then go find the vac leak.
With a significant air leak you may see the proportional
fuel swing (that forces the O2s to switch) take you
too far into the lean and make you stumble. Check if
this is the deal, by raising the closed loop enable
temperature (and get the fueling so it's roughly right
at the cruise areas where you see the sputter) and
see if the "bouncing" goes away. The yo-yo action
could also be the O2s just being sleepy from the
headers and confused from the shoot-through air
that the low-LSA cam lets into the exhaust, maybe
destabilizing that loop even more than before). If
you can see a somewhat consistent "beat time" in
this sputter deal, then look at your log files for any
of the key params (esp the O2 waveforms, the
STFT and LTFT values, injector PW - things to do
with fuel - and look for the ones that bounce at the
same rate (times 10 frames / sec on the chart). To
dope out which are cause and which, effect will be
the next layer of the puzzle but at least it'll be a
clue or three.
But the air leak deal seems pretty plain and might
just clear up the rest.
Thread Starter
12 Second Club
iTrader: (16)
Joined: Jul 2005
Posts: 783
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From: central coast, cali
it would idle at 850 before the tune but when i would put it in gear, it would drop in rpm and in oil pressure and then die out. we tuned it and now it idles at 1100rpm and when i cruise it doesnt go any lower than 1500-1600 rpms (until i come to a complete stop) then it wil go back down to 1100. Sometimes its around 1000rpms, but its rare. Im just wondering if anybody has a custom tune with similar mods as mine with the tr 224 on a 112LSA and if they could do me the favor and send me the bin. file
