EBL buck surge on part throttle
#1
EBL buck surge on part throttle
Having this rhythm surge while part throttle under 5% tps it feels like someone is pulling the e brake on and off managed to capture it on the DL I also noticed that when in park and holding the rpm steady at any rpm below 2000 it would surge about 100 rpm reducing the PRP - Gain vs O2 Error helped the surge almost eliminated it while in P/N. Talked to RBob about it he suggested its not enough proportional gains and to adjust the four PRP tables I've been tinkering with all four tables for a few hours now but haven't really made any progress
here is a DL that best shows the problem tps is steady while rpm dips 100rpm everytime the o2 mV value drops
currently running these PRP settings and also re ran a ve learn holding in the 1000-1500 rpm but the learn didnt change much of anything i also recall that the problem was not present while in VE learn
will throw in the stock ecu and aujp in the mean time to see if my problem is mechanical b/c i just changed the o2 to a NOS AC delco three wire but i have noticed this ever since switching to the ebl
here is a DL that best shows the problem tps is steady while rpm dips 100rpm everytime the o2 mV value drops
currently running these PRP settings and also re ran a ve learn holding in the 1000-1500 rpm but the learn didnt change much of anything i also recall that the problem was not present while in VE learn
will throw in the stock ecu and aujp in the mean time to see if my problem is mechanical b/c i just changed the o2 to a NOS AC delco three wire but i have noticed this ever since switching to the ebl
#2
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,432
Likes: 0
Received 225 Likes
on
211 Posts
Car: check
Engine: check
Transmission: check
Re: EBL buck surge on part throttle
Is the heated O2 due to it being further down stream of the exhaust ports? To help with this also work with the INT update delays. Since the issue is only a low throttle use the gms/sec airflow value from the data log to know which areas of the tables to change.
Slow down the INT update rate via:
INT - Delay vs Airflow
Then adjust the proportional gain and duration via the airflow tables of each:
PRP - Gain Multiplier vs Airflow
PRP - Duration Offset vs Airflow
RBob.
Slow down the INT update rate via:
INT - Delay vs Airflow
Then adjust the proportional gain and duration via the airflow tables of each:
PRP - Gain Multiplier vs Airflow
PRP - Duration Offset vs Airflow
RBob.
#3
Re: EBL buck surge on part throttle
heated o2 is installed on the shorty header collector it is a nos acdelco AFS-74 ran two different settings today seen in pics below PRP - Duration vs O2 Error was return to original 3005 value one was with low airflow values and the other high both had the same lowered value int delay vs airflow both settings didnt not improve or worsen condition still has a noticeable buck while under 5 tps in any gear coasting still feels like e brake is being pulled surge can be seen while in P/N also
threw the AUJP in there same day drove around for quite some time and there was no surge in P/N holding a 1k-1.5k or any noticeable buck e brake being pulled feeling while under the same conditions with a low throttle input
with aujp in P/N need to get cable to DL the stock ecm
threw the AUJP in there same day drove around for quite some time and there was no surge in P/N holding a 1k-1.5k or any noticeable buck e brake being pulled feeling while under the same conditions with a low throttle input
with aujp in P/N need to get cable to DL the stock ecm
#4
Re: EBL buck surge on part throttle
Originally Posted by RBob
Slow down the INT update rate via:
INT - Delay vs Airflow
INT - Delay vs Airflow
- Rob
#6
Re: EBL buck surge on part throttle
Originally Posted by BHR
slow it down to what?
- Rob
#7
Re: EBL buck surge on part throttle
I didn't say to slow it down, I said that that was my immediate thought when I seen the INT moving as fast as it is moving. I cannot see the changes that were made in the bin that may be effecting the INT because you only uploaded datalogs, but the BLM is very stagnant in the datalogs meanwhile the INT is all over the place, Understand that the BLM is initially set to move with the INT whenever the INT is 4 counts away from 128, yet during the datalog your INT (during surge) can be seen up to 145 at times while the BLM does not move, or simply does not move fast enough, nor even have a chance to catch up to it. Once the INT exceeds 132 the BLM should move in conjunction with it, yet the BLM stays rich at 110-112. You might want to increase the BLM's update rate just to see if this at least eliminates the surging so it at least has a chance to work in tandem with it...
- Rob
- Rob
Trending Topics
#8
Re: EBL buck surge on part throttle
Originally Posted by BHR
Here is bin im working with...
Originally Posted by BHR
tps is steady while rpm dips 100rpm everytime the o2 mV value drops
Try restoring the first five values using the original 3005 values in the area below;
INT - Delay Mult vs 02 Error
The first four rows were reduced by almost 50% in your bin...
- Rob
#9
Supreme Member
Re: EBL buck surge on part throttle
If the INT is all over the place, I believe RBob would say that is the INT chasing O2 cross counts.That would suggest need for more prop gain relieving the INT of doing that job.
#10
Re: EBL buck surge on part throttle
increasing the values PRP - Gain vs O2 Error made the issue worse particularly in P/N couldnt not get any noticeable difference tinkering with all four PRP settings will try streetleathals suggestions along with more tinkering the PRP settings when i get a chance
Thread
Thread Starter
Forum
Replies
Last Post