|
Registered
Join Date: Jan 2009
Location: Marietta, Ga (Atlanta)
Posts: 2,970
|
Quote:
Originally Posted by scarceller
I'll add this: trying to make a MAF pretend to be a AFM is not a good idea, it can be done but yields less than optimal results. Few pointers:
1 - A MAF can sense a change in airflow in under 10milliseconds while the AFM takes a bit longer at around 100ms
2 - MAF already compensates for air density, no need for IAT or Altitude comps. So this means you will have to back out those comps if you want the MAF to act like a AFM. Ask any vendor who's selling a MAF to replace a AFM about how they handle this issue? I re-wrote the entire air model to properly support the MAF.
Then you have the fuel model, to build a proper EFI system you MUST get both the fuel and air model correct. I spent considerable amount of effort on the fuel model also. That's why my MAF system comes with brand new modern day injectors. It's not magic, first you meter the air correctly then you match the fuel to the air. If the components for metering the air and fuel are accurate and top notch then it's just MATH to get the desired AFR. This is why I use nothing but the best MAF device and fully speced injectors.
|
Sal,
That's great info, but when are you going to help out us 3.6 guys with a MAF/injector system. I know your test bed has been your own car for the 3.2 system, you just need to pick up a 3.6 car and get busy. (folks always give THEIR suggestions
on how to spend YOUR money, don't they) LOL
Regards,
Grant
__________________
'80SC Widebody 3.6 transplant Anthracite "The Rocket"
Long gone but still miss them all:
'77 911 Targa, '72 BMW 3.0CS Coupe(finest car I ever had!)
'71 911T Coupe White, '70 911T Coupe Blue
'68 911 Coupe Orange, '68 911L Soft Window Targa
|