I agree with that, most of the time when you get a tune, especially on a dyno, they just tune WOT pulls. All the rest of the stuff is what matters for driveability, and the Holley can tune WOT pulls itself pretty easy if you have the right targets.
CK5
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LSX454 swapped 95 BASS burb.
- Thread starter shady
- Start date
Little lower, little cooler, bigger sounds.
...
I have no idea what you're talking about lol.
I'm a fuggin tuning idiot..and this is all my first go round.
Uh.... None, lol.
I have no idea what you're talking about lol.
I'm a fuggin tuning idiot..and this is all my first go round.
There is default tables for all of that stuff, and some of it is tweaked, it's there, you just haven't opened it. In the fuel panel look at the lower tabs for enrichment...
It has to be doing something along those lines or it would run like crap. The simplest parallel has to be a carb accelerator pump. When the throttle is blipped, a little extra gas is shot in (in addition to what the jets/venturis are pulling) to avoid a lean dip. The EFI equivalent is looking at the derivative (slope) of the TPS sensor or a MAP sensor and adding fuel on top of what the fuel map suggests. Sometimes you add fuel because the model says your intake pools a little, then you pull fuel later in zones where the manifold dries back out. In a modern controller, the equation for length of the next injector pulse width has at least a dozen things in it, one of which is that number in your fuel map. It's adjusting for engine temp, air temp, altitude, fuel composition, "detected" octane, torque management, and so on. I suspect the Holley is a little simpler, and they probably have some default stuff in there, but there must be some adjustments for transient fueling.
Ok... Google says 99 is high vacuum.
I was thinking right.
Catch it at the right moment you can see what each one is.
But, second down, left column is AFR
Second down center is MAP.
Bottom left is TPS.
This is rolling up a normal street and coming to a stop.
View attachment VID_20260714_112920510.mp4
I was thinking right.
Catch it at the right moment you can see what each one is.
But, second down, left column is AFR
Second down center is MAP.
Bottom left is TPS.
This is rolling up a normal street and coming to a stop.
View attachment VID_20260714_112920510.mp4
Your map sensor reading looks jacked.
When you let off the gas to decelerate, it should drop low to around 20-30’s. And when you gas it, towards wot, it should go higher towards 95 kpa. When you turn the key on but don’t start it it should read atmospheric pressure which is around 94-95KPA.
There is a lot, the accelerator pump shot would be equivalent to the acceleration enrichment. Within that one tab there are 6 charts to change. The main one being this one, you can see the other 5 as well. If you click on the "help?" when in any menu it will take you to the explanation of what it does. I have tweaked most of those my my personal stuff as there are different curve shapes that work for different throttle bodies, etc. This one is a default 58x LS one from Terminator X, the Dominator software is a very similar interface.
We have discussed in this thread other tuning issues that could cause the stalling, such as the IAC positions when running, etc. As if the IAC is too far closed or ramps down too fast it can cause it to stall when you let off the throttle.
I can't see the above video.
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Rick check this...click on the idle (the tach icon), then IAC settings. The "IAC Hold Position" in the middle below, is how far open the IAC is when the engine is being driven above an idle, and the "Ramp decay time" is how long it takes to come back down to idle. Increasing either of them, especially the IAC Hold, can keep the engine running easier when you let off the throttle.
If you get it too high the opposite will happen, it will seem like it comes back to idle way too slow and it may want to push the vehicle when you let off.
A 454 is a pretty big LS so it may need a significantly higher IAC Hold.
If you get it too high the opposite will happen, it will seem like it comes back to idle way too slow and it may want to push the vehicle when you let off.
A 454 is a pretty big LS so it may need a significantly higher IAC Hold.
