SD Tuning - Please Confirm My Process
Thread Starter
Instructor
Joined: Feb 2009
Posts: 145
Likes: 0
From: Colgate WI
SD Tuning - Please Confirm My Process
I am about to start tuning my 91 speed density system on my car after I have installed exhaust and intake. After reading a bunch of info over at thirdgen.org, this is what I understand the process to be:
Datalog the car without getting into PE
Analyze the data and get all the non PE data points to 128 BLM by changing the VE tables only.
After that, I'm not sure of the part to tune PE. Any help here would be helpful.
Also, is the prefered method still changing VE tables only (for non PE data points)? Lots of the info at thirdgen is from several years ago and I want to make sure there isn't a new prefered way to tune.
Thanks!
Datalog the car without getting into PE
Analyze the data and get all the non PE data points to 128 BLM by changing the VE tables only.
After that, I'm not sure of the part to tune PE. Any help here would be helpful.
Also, is the prefered method still changing VE tables only (for non PE data points)? Lots of the info at thirdgen is from several years ago and I want to make sure there isn't a new prefered way to tune.
Thanks!
Safety Car
Joined: Sep 2001
Posts: 4,154
Likes: 553
From: Glenbeulah Wi
You are correct, try and get all the non PE BLM's to 128. The PE enrichment will be handles by the commanded AFR when in PE. It should be correct as long as your VE table is correct. The commanded PE table will add whatever percentage of fuel to the base VE table that is entered like 1.14 is 14% more fuel in PE.
Pro
Joined: Jul 2002
Posts: 703
Likes: 0
From: Milwaukee Wi
When in PE it will look at the BLM last seen in that cell. If BLM<128(removing fuel-rich) it uses 128. If BLM >128 (adding fuel-lean) it uses actual #. Using 128 in that case would be too lean. On dyno commanded to 12.3 for PE I ran 12.0/1.
