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LQ9 - setup parameters - Bog/lull off idle

 
Old 07-20-2016, 05:00 PM
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Default LQ9 - setup parameters - Bog/lull off idle

I have setup my (2004) LQ9 using the FAST EZ-LS, originally using most of the default settings in the setup wizard, but started to play a bit with the numbers to get it running better/stronger... Seems to pull hard through all the shifts and RPM range after I have a bit of movement and rpm built up. If I "punch" it from a stand still from idle, I seem to get a "bog" or lull until it climbs in rpm..... Its transplanted in a rock crawler/rock bouncer so that initial launch is key, and Im missing out...
Motor internals are stock, with headers/exhaust and a aftermarket cold air intake.... Th400

Some of the current values I have entered in are:

Fuel pressure : 58 psi
Injectors : 25lb
Timing idle : 22
All in timing : 32
All in timing rpm: 3000

AFR:
Idle - 13.1
Cruise- 14
WOT - 13

Just looking some some input on the numbers I have entered in??? Things to change or look for ???

Thanks!
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Old 07-23-2016, 03:57 PM
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Do that thing have any way to data log? Have you checked your TPS to make sure it is good, and does not have a bad spot? Do you have a wideband? If so, what does it do on the punch?
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Old 07-23-2016, 09:06 PM
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None of the parameters you listed suggest any way to control tip-in fueling. I'm going to go out on a limb and guess that such a simplistic tuning solution is probably geared toward stock 5.7l motors, and one of those "default settings" you mentioned may need more scrutiny.
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Old 07-24-2016, 09:43 PM
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Originally Posted by rpturbo View Post
Do that thing have any way to data log? Have you checked your TPS to make sure it is good, and does not have a bad spot? Do you have a wideband? If so, what does it do on the punch?
No data log no, but it does show a live feed. I thought there seemed to be a bit of a "blip" in the TPS, so I installed a new on.... It made no difference.
There is a wideband 02 - but have not looked at the values. Will check it out!
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Old 07-24-2016, 09:49 PM
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Originally Posted by gametech View Post
None of the parameters you listed suggest any way to control tip-in fueling. I'm going to go out on a limb and guess that such a simplistic tuning solution is probably geared toward stock 5.7l motors, and one of those "default settings" you mentioned may need more scrutiny.
Correct. I have started tweaking some values but in all honesty im playing a complete guessing game. Was hoping to have someone chime in on what to be looking for or even try.
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Old 07-25-2016, 01:24 AM
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Watch what the afr does when it bogs. Correct the rich or lean condition and it will probably go away.
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Old 07-25-2016, 08:14 AM
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Originally Posted by Brando5641 View Post
Watch what the afr does when it bogs. Correct the rich or lean condition and it will probably go away.
A bar type graph is given for AFR. A "targeted AFR" and "Actual AFR". When I punch the throttle the actual AFR climbs past the actual AFR and tops out, then settles once the engine catches up. I have played within the full parameter range given on the "Accel Fuel" setting... doesnt seem to make a difference...

I run extremely shallow gearing and not much of an exhaust, so its confusing at times because I get lots of popping out the exhaust during de-acceleration... Leading me to believe its running too rich... but i dont think its the case.....
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Old 07-25-2016, 08:16 AM
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Old 07-25-2016, 01:53 PM
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Check also the burst knock stuff since this is a truck
motor/PCM donor. Raise the delta g/cyl numbers at
least 2X from factory truck values, to keep from the
burst knock triggering on just about any throttle (or
even RPM run-up in 1st) transition.
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Old 07-25-2016, 02:06 PM
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Originally Posted by jimmyblue View Post
Check also the burst knock stuff since this is a truck
motor/PCM donor. Raise the delta g/cyl numbers at
least 2X from factory truck values, to keep from the
burst knock triggering on just about any throttle (or
even RPM run-up in 1st) transition.

I dont think I have seen that as a option to change within the FAST EZ LS module?
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Old 08-03-2016, 11:19 AM
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Did you try calling Fast? I wonder if your exhaust being to short is causing your wideband to read weird when you first put throttle into it.
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