When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I know this should be in the tuning section, but most of you tuner guys hang in this section more.
Wondering if when I get into PE, there is a delay before the fuel reacts. Just wondering if this is too long. If so, how to fix. This is a quick blast from rolling into boost in 3rd then into 4th. lean tip in is on both gears.
HPT is just in the process of adding a parameter that has proven to correct that for some people. It depends on the ECU version number.
There is an ongoing thread on HPT forum about it.
Definitely wouldn't be happy with that spike. Probably have to see the tune to try and be of any help. Would also log and check fuel pressure to rule out any drop.
In that thread you guys are talking about, they were having issues with a lean spike exactly 2 seconds after PE.
My question with my log is... the lean spike immediately after PE is commanded, if mine is too long before the fuel system reacts. The log is literally zoomed in and the delay is 2/100 sec.
Just don't know if that is normal amount of time or not and if the delay could be how long it is taking for the wide band is taking to see the change and report it.
Not sure on EFI Live, HPTuners just recently added it. It's in the transient fueling section for their software, not sure where it'd be on EFI Live though
Last edited by schpenxel; May 1, 2017 at 10:43 AM.
It seems to be kind of a "global" transient value that is really easy to change. Much easier than going through say the evap impact tables and trying to play with those and some of the other transient stuff. Transient fueling is such a PITA to mess with IMO.
Increasing it generally helps with lean tip in
It's only available on E38's unfortunately, they told me they couldn't add it on E40's
It seems to be kind of a "global" transient value that is really easy to change. Much easier than going through say the evap impact tables and trying to play with those and some of the other transient stuff. Transient fueling is such a PITA to mess with IMO.
Increasing it generally helps with lean tip in
Thanks for that.
Now, it would be really nice to get a quarterly (or even twice per year) update of new features and relevant links with HP Tuners forum BY email AND with a specific discussion tread(s).
Like "Q2 2017 update of E38/E67 with desoot" and so on.
With not very active tuners and a new information, those tuning tricks will not be used just because they are unknown.
So talk with your superior, or give me a link. :-)
Originally Posted by schpenxel
It's only available on E38's unfortunately, they told me they couldn't add it on E40's
Silly question, but was this car calibrated in both MAF and "Virtual VE" using good steady state dyno data before chasing transient fuel control? The factory blended aircharge model is surprisingly good *IF* you populate both airflow models correctly. This alone goes a LONG way toward correcting most transient fueling issues on these cars.
Silly question, but was this car calibrated in both MAF and "Virtual VE" using good steady state dyno data before chasing transient fuel control? The factory blended aircharge model is surprisingly good *IF* you populate both airflow models correctly. This alone goes a LONG way toward correcting most transient fueling issues on these cars.
it has an SD tune. It had a "tooner" mess with it on the dyno about a year and a half ago. Comparing the before and after tune, looked like he only adjusted PE and heavily desensitized my knock sensors.
Many changes have been done to the car since and I have done all adjustments on the street with help from time to time by other guys here on the board.
lean tip in
