MAF loction and tube shape? Driveability Issues....
MAF loction and tube shape? Driveability Issues.... Curious how important it is, and if it could relate to my problem.
I have an LS2/T56 in an RX7 with a GM Performance Parts LS2 harness. It uses the blade style LS7 MAF.
At full throttle the car runs beautiful, but at low rpms while at a steady speed with almost no throttle imput I get alot of bucking to the point that driving the car isn't exactly enjoyable. I also get pretty damn poor gas mileage. I'm not expecting anything great, but 10-12mpg im getting isn't what I should be seeing. The only mods are LT headers, and a custom intake setup. I get maybe 17mpg on the highway, and that is with nice driving.
I think the shape and length of the intake tube is the source of my problem, but would like some advice. These images should give you an idea of what I am working with.
Uploaded with ImageShack.us
Uploaded with ImageShack.us
I have an LS2/T56 in an RX7 with a GM Performance Parts LS2 harness. It uses the blade style LS7 MAF.
At full throttle the car runs beautiful, but at low rpms while at a steady speed with almost no throttle imput I get alot of bucking to the point that driving the car isn't exactly enjoyable. I also get pretty damn poor gas mileage. I'm not expecting anything great, but 10-12mpg im getting isn't what I should be seeing. The only mods are LT headers, and a custom intake setup. I get maybe 17mpg on the highway, and that is with nice driving.
I think the shape and length of the intake tube is the source of my problem, but would like some advice. These images should give you an idea of what I am working with.
Uploaded with ImageShack.us
Uploaded with ImageShack.us
If the MAF is screened (don't know the LS2 hardware)
then tract geometry influence is minimized.
I have seen people with other opinions but my experience
says the MAF is only a minor component of the dynamic
airflow calculation at low RPMs. You have the speed
density accuracy as a bigger piece, and any meddling
from the closed loop trimming (accurate or not, LTs and
thermal effects?).
You could see whether it runs better in open loop with
trims zeroed, and you could see whether it runs better
with the MAF faulted out. These would point you at the
likely culprit.
then tract geometry influence is minimized.
I have seen people with other opinions but my experience
says the MAF is only a minor component of the dynamic
airflow calculation at low RPMs. You have the speed
density accuracy as a bigger piece, and any meddling
from the closed loop trimming (accurate or not, LTs and
thermal effects?).
You could see whether it runs better in open loop with
trims zeroed, and you could see whether it runs better
with the MAF faulted out. These would point you at the
likely culprit.
Yes the blade style maf's are real sensitive to bends, and any type of disturbance. They don't like being right behind the filter either.
They need to have a straight section in front and behind for them to read correctly.
They need to have a straight section in front and behind for them to read correctly.
Trending Topics
I use this one and my LS3 MAF logs are very smooth. The hz log used to be like a saw blade that got he crap beat out of it.
The bottom is the hz log.
I do have a nice straight tube in front and behind the MAF.
100 mm Air Straightener
The bottom is the hz log.
I do have a nice straight tube in front and behind the MAF.
100 mm Air Straightener
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thanks for the replies!
I think I am going to try a new intake with the MAF repositioned, and then tuning.
I may try disconnecting the MAF to see if it makes a difference. I'm not sure of what kind of limp mode the car goes into though. First I have to get the trans back into the car...thats a whole nother' story.
I may try disconnecting the MAF to see if it makes a difference. I'm not sure of what kind of limp mode the car goes into though. First I have to get the trans back into the car...thats a whole nother' story.
