Does resetting the ECU really make a difference?
10-21-2006, 06:34 PM
#1
Does resetting the ECU really make a difference?
I have read countless threads about how resetting the ECU will unlock the hidden potential of bolt-ons. Some say it's necessary, some say the ECU will eventually learn anyway (my own opinion), and still others that say the ECU will negate the effects of bolt-ons eventually. Sometimes I 'think' I can feel a difference after resetting the ECU, whether I've made a change or not, but I wouldn't bet anything valuable that it actually did make any difference at all.
I've been to several forums for various manufacturers, and there are as many opinions as there are armpits, and everyone thinks they're right. Has anyone found a definitive reference or source that explains how an ECU, and the 350Z in particular, reacts to modifications?
I've been to several forums for various manufacturers, and there are as many opinions as there are armpits, and everyone thinks they're right. Has anyone found a definitive reference or source that explains how an ECU, and the 350Z in particular, reacts to modifications?
10-21-2006, 08:31 PM
#2
I've reset the ECU several times using cipher, and done before and after comparisons.
It doesn't really do much.
The ECU pretty much does what it wants to air fuel ratios and timing.
Some mods cause a significant difference in AFR. Some mods don't.
For example, the mrev2 changed my AFR, but my kinetix cats didn't.
You have a MT 35th AE, so your results may vary due to the revup motor...
The stock ECU never learns your mods. My car had the same air/fuel ratio immediately after installing the MREV2, compared to thousands of miles later.
You need tuning to optimize fuel maps and tweak timing.
It doesn't really do much.
The ECU pretty much does what it wants to air fuel ratios and timing.
Some mods cause a significant difference in AFR. Some mods don't.
For example, the mrev2 changed my AFR, but my kinetix cats didn't.
You have a MT 35th AE, so your results may vary due to the revup motor...
The stock ECU never learns your mods. My car had the same air/fuel ratio immediately after installing the MREV2, compared to thousands of miles later.
You need tuning to optimize fuel maps and tweak timing.
10-21-2006, 08:51 PM
#3
Yea, I didn't see enough difference with a reset to try it again. Now I only disconnect the battery if necessary for the work I'm doing on the car.
I'm confused, the MREV did or didn't change your AFR? These two statements seam contradictory. I actually felt a difference with the MREV2/plenum/HFC mods, but I had no way to tell if it was the AFR changing or what.
Originally Posted by Wired 24/7
...... For example, the mrev2 changed my AFR, but my kinetix cats didn't.
...... My car had the same air/fuel ratio immediately after installing the MREV2, compared to thousands of miles later.
...... My car had the same air/fuel ratio immediately after installing the MREV2, compared to thousands of miles later.
10-22-2006, 03:01 PM
#4
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undrgnd, speaking of English, I know that my English suck ...
Originally Posted by undrgnd
Quote: Originally Posted by Wired 24/7
...... For example, the mrev2 changed my AFR, but my kinetix cats didn't.
...... My car had the same air/fuel ratio immediately after installing the MREV2, compared to thousands of miles later.
I'm confused, the MREV did or didn't change your AFR? These two statements seam contradictory. I actually felt a difference with the MREV2/plenum/HFC mods, but I had no way to tell if it was the AFR changing or what.
...... For example, the mrev2 changed my AFR, but my kinetix cats didn't.
...... My car had the same air/fuel ratio immediately after installing the MREV2, compared to thousands of miles later.
I'm confused, the MREV did or didn't change your AFR? These two statements seam contradictory. I actually felt a difference with the MREV2/plenum/HFC mods, but I had no way to tell if it was the AFR changing or what.
10-22-2006, 05:27 PM
#5
I think dovla understands.
What I'm saying is:
In order of when they were put on my car:
MREV2 -> changed AFR, leaned it out a bit up to 4000rpm
5/16" spacer on top of MREV2 -> no noticeable change in AFR
Thousands of miles later -> no change
and after that,
popcharger -> no change
kinetix cats -> no change
But depending on different ECU versions I can envision different things happening.
What I'm saying is:
In order of when they were put on my car:
MREV2 -> changed AFR, leaned it out a bit up to 4000rpm
5/16" spacer on top of MREV2 -> no noticeable change in AFR
Thousands of miles later -> no change
and after that,
popcharger -> no change
kinetix cats -> no change
But depending on different ECU versions I can envision different things happening.
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10-23-2006, 02:25 PM
#10
the ECU is very sensitive to what octane you run. If you're stuck with 91 octane, the Z in stock form was designed for 93 octane and will automatically pull timing if it detects the slightest ping
so if you add some bolt on parts, which in reality require more fuel or higher octane gas to prevent ping, the ECU again will pull even more timing until the knock is gone
if you reset the ECU and have mods and are using crappy 91 octane gas, you probably won't feel a difference since the ECU will pull timing fairly fast. You might get away with 1 WOT run with slightly more power (and knock) before the car goes back to accellerating similar to stock
so if you add some bolt on parts, which in reality require more fuel or higher octane gas to prevent ping, the ECU again will pull even more timing until the knock is gone
if you reset the ECU and have mods and are using crappy 91 octane gas, you probably won't feel a difference since the ECU will pull timing fairly fast. You might get away with 1 WOT run with slightly more power (and knock) before the car goes back to accellerating similar to stock
10-23-2006, 06:47 PM
#11
Originally Posted by sentry65
the ECU is very sensitive to what octane you run. If you're stuck with 91 octane, the Z in stock form was designed for 93 octane and will automatically pull timing if it detects the slightest ping
so if you add some bolt on parts, which in reality require more fuel or higher octane gas to prevent ping, the ECU again will pull even more timing until the knock is gone
if you reset the ECU and have mods and are using crappy 91 octane gas, you probably won't feel a difference since the ECU will pull timing fairly fast. You might get away with 1 WOT run with slightly more power (and knock) before the car goes back to accellerating similar to stock
so if you add some bolt on parts, which in reality require more fuel or higher octane gas to prevent ping, the ECU again will pull even more timing until the knock is gone
if you reset the ECU and have mods and are using crappy 91 octane gas, you probably won't feel a difference since the ECU will pull timing fairly fast. You might get away with 1 WOT run with slightly more power (and knock) before the car goes back to accellerating similar to stock
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