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vacuum tuning

Old 04-30-2004, 01:37 AM
  #1  
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Default vacuum tuning

Now I know for sure I had my facts messed up. I thought we only need to creat a table for boost since that is when the ecu is looking at the tables, but while we run vacuum, the ecu would be doing its own thing accordind to it various sensor.

...........so i thought.
Vacuum tuning seem much complicated than wot..just my wanna share my thoughts.

On another note, does anyboyd have a boosted pr4 bin for TE? I can only find NA bin.
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Old 04-30-2004, 02:38 AM
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Default Re:vacuum tuning

You are also adjusting the entire vacuum map to 450cc injectors (if thats what your running). Although its mostly a straight forward, a little bit of tweaking is needed.
I retuned a friends car on NG5 today, and of the 2.5hrs spent on it, only about 30mins was on WOT. Doing part throttle is the most time consuming. Having little stumbles and hiccups is annoying, to me atleast. For the most part, closed loop takes care of this and allows for some pretty big margins of error.
Do you have any friends w/ a WB that you can use? If not, PM me your entire set-up and expected max boost level, and I can get you up and running.

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Old 04-30-2004, 09:16 AM
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Default Re:vacuum tuning

Originally Posted by Anti-NA
On another note, does anyboyd have a boosted pr4 bin for TE? I can only find NA bin.
I will soon...just need to get my new clutch installed and I will be tuning the NG5_PM7 in my external PA PR4 ECU
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Old 04-30-2004, 09:35 AM
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Default Re:vacuum tuning

Originally Posted by leed
You are also adjusting the entire vacuum map to 450cc injectors (if thats what your running). Although its mostly a straight forward, a little bit of tweaking is needed.
I retuned a friends car on NG5 today, and of the 2.5hrs spent on it, only about 30mins was on WOT. Doing part throttle is the most time consuming. Having little stumbles and hiccups is annoying, to me atleast. For the most part, closed loop takes care of this and allows for some pretty big margins of error.
Do you have any friends w/ a WB that you can use? If not, PM me your entire set-up and expected max boost level, and I can get you up and running.

ohhhh i got you, i completely forgot about that who 450cc deal, but yeh, i'm running 450cc with a walboro.
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Old 04-30-2004, 09:48 AM
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Default Re:vacuum tuning

the set of maps for NG5 I spent a *long* time tuning are posted on PGMFI. db09.exp was good enough for me to pass a 4-gas sniffer emissions test on, and it also is tuned decently in boost. I use a PM6 not a PR4, however. Chris (xenocron) pretty convincingly demonstrated that the same ROM will produce different AFRs on PM6 vs PR4, even though both will run the code. In other words, be careful.
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Old 04-30-2004, 10:47 AM
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Default Re:vacuum tuning

Originally Posted by xenocron
Originally Posted by Anti-NA
On another note, does anyboyd have a boosted pr4 bin for TE? I can only find NA bin.
I will soon...just need to get my new clutch installed and I will be tuning the NG5_PM7 in my external PA PR4 ECU
xenocron / others-
would NG5_PM7 work in a internal PA PR4?

--Jim
UPDATE:
From: PGMFI.org
Re: NG5: boost/NA transition fixed
Author: blundar
Date: 04-19-04 139

Edit: oh yeah, the PM7 source is pretty-damn-similar main difference being that it doesn't check for a PA sensor so it is a lot friendlier to OBD0 PR4s and UK PP5s and whatnot.



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Old 04-30-2004, 12:39 PM
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Default Re:vacuum tuning

Originally Posted by blundar
the set of maps for NG5 I spent a *long* time tuning are posted on PGMFI. db09.exp was good enough for me to pass a 4-gas sniffer emissions test on, and it also is tuned decently in boost. I use a PM6 not a PR4, however. Chris (xenocron) pretty convincingly demonstrated that the same ROM will produce different AFRs on PM6 vs PR4, even though both will run the code. In other words, be careful.
every one of my computers will produce different AF's im pretty sure.... PS9/PM6/PR4....
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Old 04-30-2004, 12:58 PM
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Default Re:vacuum tuning

Originally Posted by blundar
the set of maps for NG5 I spent a *long* time tuning are posted on PGMFI. db09.exp was good enough for me to pass a 4-gas sniffer emissions test on, and it also is tuned decently in boost. I use a PM6 not a PR4, however. Chris (xenocron) pretty convincingly demonstrated that the same ROM will produce different AFRs on PM6 vs PR4, even though both will run the code. In other words, be careful.
I was all excited to try your map out, being already WB tuned and all. Damn these PR4's, it was deff. different.
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Old 04-30-2004, 04:29 PM
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Default Re:vacuum tuning

Chris said PM6 ran his car richer than PR4 I believe.

The PM7 should run fine in PR4 w/ internal PA.
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Old 04-30-2004, 04:30 PM
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Default Re:vacuum tuning

also, remember the walbro pump with stock FPR will be running higher fuel pressure than stock pump. Still running stock return system.
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