Autotap / MAFT Questions...
Thread Starter
Instructor
Joined: Jun 2002
Posts: 139
Likes: 0
From: Magnolia Tx
Autotap / MAFT Questions...
Hey guys, could use a few tips here.
I put a VaraRam,and new Bridge/coupler on my 2000 C5.
I purchased an AutoTap(enhanced) and a MAFT from a forum member.
My questions are, what kind of run do I make when hooked up to the AutoTap, do I hook up, start the record, drive normally, then run a 1/4 mile full out,
Then come back export the data to a spreadsheet, try my best to figure out how much to adjust the MAFT, possibly upload the results to a forum member :) and make the adjustments? Just looking for tips/procedures here, I know dozens of you guys have done this already...Thanks in advance.
Kyle
I put a VaraRam,and new Bridge/coupler on my 2000 C5.
I purchased an AutoTap(enhanced) and a MAFT from a forum member.
My questions are, what kind of run do I make when hooked up to the AutoTap, do I hook up, start the record, drive normally, then run a 1/4 mile full out,
Then come back export the data to a spreadsheet, try my best to figure out how much to adjust the MAFT, possibly upload the results to a forum member :) and make the adjustments? Just looking for tips/procedures here, I know dozens of you guys have done this already...Thanks in advance.
Kyle
Le Mans Master
Joined: Jul 2000
Posts: 7,758
Likes: 0
From: Fort Worth Texas
Cruise-In II Veteran
Cruise-In III Veteran
Re: Autotap / MAFT Questions... (KylePatrick)
Kyle, before you put the MAFT on, you want to hook up autotap, and drive around normally.
The parameters you want to look at in autotap are:
Long Term Fuel Trim Bank1
Long Term Fuel Trim Bank2
Current Fuel Cell
Engine Speed
Vehicle Speed
Timing Advance
Knock Retard
O2 Sensor Bank 1 Sensor 1
O2 Sensor Bank 2 Sensor 1
While driving around normally and varying your speed, you want to look closely at your Long Term Fuel trims. And what thier values are, most specifically between 0 - 19 fuel cells.
Your goal is to adjust the BASE on the MAF Translator if necessary to dial in Zero, or less than 0 Long Term Fuel trim valves. Once you have acomplished this. Then, and only then, do you move on to WOT tuning.
Remember that you must drive quite some time. Possibly 200 miles between making changes to the BASE setting on the MAFT.
Once you go to WOT tuning, you dont need to wait to make such changes.
WOT tuning will focus in on what the factory O2 sensor values are. They are innacurate at WOT, but will get you close. The best method is using a wide band 02 sensor, such as on a dyno.
The parameters you want to look at in autotap are:
Long Term Fuel Trim Bank1
Long Term Fuel Trim Bank2
Current Fuel Cell
Engine Speed
Vehicle Speed
Timing Advance
Knock Retard
O2 Sensor Bank 1 Sensor 1
O2 Sensor Bank 2 Sensor 1
While driving around normally and varying your speed, you want to look closely at your Long Term Fuel trims. And what thier values are, most specifically between 0 - 19 fuel cells.
Your goal is to adjust the BASE on the MAF Translator if necessary to dial in Zero, or less than 0 Long Term Fuel trim valves. Once you have acomplished this. Then, and only then, do you move on to WOT tuning.
Remember that you must drive quite some time. Possibly 200 miles between making changes to the BASE setting on the MAFT.
Once you go to WOT tuning, you dont need to wait to make such changes.
WOT tuning will focus in on what the factory O2 sensor values are. They are innacurate at WOT, but will get you close. The best method is using a wide band 02 sensor, such as on a dyno.
Drifting
Joined: Jul 2000
Posts: 1,517
Likes: 1
From: Stockholm
Re: Autotap / MAFT Questions... (KylePatrick)
Check out http://www.c5forum.com/diy/ltft.php It's a quite good guide, download the AutoTap config file and the Excel spreadsheet. You might want to change the fuelcells used in the spreadsheet to use only cell 1-15.
:cheers:
:cheers:
Thread Starter
Instructor
Joined: Jun 2002
Posts: 139
Likes: 0
From: Magnolia Tx
Re: Autotap / MAFT Questions... (seanr)
Wow, thats exactly what I was looking for. :yesnod:
Did I mention you guys ROCK? :flag
I'm sure I will have more questions after I do the initial run.
Thanks for the jumpstart!,
Kyle
Did I mention you guys ROCK? :flag
I'm sure I will have more questions after I do the initial run.
Thanks for the jumpstart!,
Kyle
