HPTuner_surging idle
11-14-2004, 07:18 PM
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HPTuner_surging idle Holden Statesman LS1 motor, 4L60E Transmission, MAF less (MAF removed).
1) Installed CompCam XR265HR (265/271), 1.8 Roller Rockers....no problems.
2) Reflashed with LS1Edit, tuned and Dyno the vehicle.
3) Installed 2800rpm Stall Speed converter, had inital cold idle problems, NO engine surging.
Downloaded and reflashed a couple of times with HPTuner while adjusting transmittion shift pattern, had one bad flash, changed O2 censors and since then I have had a never ending problem with engine surging off the idle when the engine is hot, does not seem to be a problem when cold.
Can anybody help ?
1) Installed CompCam XR265HR (265/271), 1.8 Roller Rockers....no problems.
2) Reflashed with LS1Edit, tuned and Dyno the vehicle.
3) Installed 2800rpm Stall Speed converter, had inital cold idle problems, NO engine surging.
Downloaded and reflashed a couple of times with HPTuner while adjusting transmittion shift pattern, had one bad flash, changed O2 censors and since then I have had a never ending problem with engine surging off the idle when the engine is hot, does not seem to be a problem when cold.
Can anybody help ?
11-14-2004, 08:42 PM
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Have you tried going back a few tune revisions just to see
if this is a tune artifact vs (say) new hardware?
Super-slow sensors are one good way to get idle surge.
That is a pretty big cam and I would expect it to want
a lot of help with low end mixture (VE).
You could try raising the closed loop enable temp way
up, to distinguish a loop problem from a mixture-at-
temp problem; if it surges in closed loop but not in
open loop, all other things being the same, that says
it's about the O2s, mixture loop time constant, etc.
With the loop opened you will be well able to see your
true mixture and tweak that up proper. Then reclose
the loop and see if it's happier having less work to do?
if this is a tune artifact vs (say) new hardware?
Super-slow sensors are one good way to get idle surge.
That is a pretty big cam and I would expect it to want
a lot of help with low end mixture (VE).
You could try raising the closed loop enable temp way
up, to distinguish a loop problem from a mixture-at-
temp problem; if it surges in closed loop but not in
open loop, all other things being the same, that says
it's about the O2s, mixture loop time constant, etc.
With the loop opened you will be well able to see your
true mixture and tweak that up proper. Then reclose
the loop and see if it's happier having less work to do?
11-15-2004, 02:12 AM
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Jimmyblue....thank you for your quick response, your advise is correct and your suggestions is what my workshop will be doing ASAP.
fast98...you are correct, duration is advertised, at 0.050 lift it is 212/218, it is a street cam.
Another_User...MAF has been removed and throttle body butterfly has been drilled, I will suggest review of the air flow table to my workshop.
fast98...you are correct, duration is advertised, at 0.050 lift it is 212/218, it is a street cam.
Another_User...MAF has been removed and throttle body butterfly has been drilled, I will suggest review of the air flow table to my workshop.