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.

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.

Re:vacuum tuning
 

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

Re:vacuum tuning
 

ohhhh i got you, i completely forgot about that who 450cc deal, but yeh, i'm running 450cc with a walboro.

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.

Re:vacuum tuning
 

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 13:39

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.

Re:vacuum tuning
 

every one of my computers will produce different AF's im pretty sure.... PS9/PM6/PR4....

Re:vacuum tuning
 

I was all excited to try your map out, being already WB tuned and all. Damn these PR4's, it was deff. different.

Re:vacuum tuning
 

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

The PM7 should run fine in PR4 w/ internal PA.

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.

Re:vacuum tuning
 

PR4 def ran leaner than the PM6...but that was on Blundar's funky ass NG1/NG2 code.

Full boost tuned to 12.0 on a PR4 ran 11.3 on a PM6...

BIG DIFFERENCE...timing also acts differently, but that's not easily provable without a dyno.

Re:vacuum tuning
 

Then I would have to use that NG5 map with my PR4, but then richen it up a little bit or to the desired AFR which is 12:1. When I get that desired afr, I would watch my ETG, at whichever points it start to raise, i would have to start to pull my timing.

correct?

The only major concern I have right now is how much to richen up and where to to richen up.

Re:vacuum tuning
 

db09.exp should run overly rich in your PR4...make sure you are using the PM7 version of NG5 tho...and make sure your fuel pressure is close to Dave's (55psi). If you are at stock fuel pressure, I'm guessing you will run a touch lean if not very close to Dave.

Re:vacuum tuning
 

I don't think I'm understanding what you mean by the pm7 version?
I also downloaded your exp for a boosted b18a from turboedit.org, is that a suitable map? I exported it into the NG5 bin and it exported smoothly, is this map reliable?

Re:vacuum tuning
 

No...the export on TurboEdit.org is from an NG1/NG2 version.

Re-read the thread once more...I thought I was pretty clear on the differences between the two ECUs.

PM7 'version' is the code version that doesnt look for ELD sensor (throws a solid CEL in a 90 PR4 ECU...)

Re:vacuum tuning
 

*slap myself* yeah, i totally missed that. Here are my last two question, I'm odering my stuffs from moate, but I dont know which chip is the correct chip.
As for tuning, so everytime I want to adjust my table I have to discard the previous chip and put in a new chip? I think i'm ready for tuboedit, i love it already.

Re:vacuum tuning
 

Buy 29c256 chips with a 120ms or better speed. These can be reused over and over...wont have to discard them for a while.

What I did when I started was burn 4 versions of a chip. One i thought would work, two that ran richer and one that ran leaner. But only selectively changing a few spots in the maps with every change.