[Gmecm] Tuning a larger MAF on L98

[Rick McLeod]

IMHO, you would be better to modify the fuel parms
than the output of the sensor, as when you reach the
top of the output, you may not be at the top of the
full flow of air, hence a flat line from near WOT to
WOT. Have you graphed the flow of the new MAF sensor,
to make sure the output is relative to flow? Before
modifying anything, I'd make sure the sesor is
performing the way you expect it to.

BTW, what ECM and code are you using, I would assume
some variant of '165 code?

Also, have you increased the size of injectors to
match the air flow, etc? What about fuel pressure
increase. It all works as a system. 

--- Mike Poore <mp at FlowersByValerie.com> wrote:

> I have a heavily modified 85 L98 engine. I
> fabricated a new MAF housing 
> and ducting from the throttle body to the air
> cleaner. I removed the oem 
> sensor from its housing and installed it in my
> fabricated one. I don't 
> have the exact measurements handy, but the new MAF
> will flow about 
> double the stick unit. The engine idles well, but
> has a severe 
> hesitation when opening the throttle. The faster you
> open the throttle 
> the worse the hesitation. Obviously, it needs more
> fuel, but what is the 
> best way to compensate?
> 
> 1. Increase fuel enrichment, or
> 2. Modify the MAF to better reflect actual flow.
> 
> I have Mastertune and GME for editing. I am trying
> to figure out what 
> exactly I need to change to get more fuel when the
> throttle opens. Any 
> advice?
> 
> I looked at modifying the output of the MAF. My
> understanding is that as 
> airflow increases, so does voltage. If the new MAF
> housing has fifty 
> percent more area than old, how much do I raise the
> voltage? Any 
> suggestions on how to send a voltage to the ecm that
> more accurately 
> reflects air flow. Ideally, something adjustable
> would be great. I wish 
> I knew more about electronic circuits because this
> is probably very 
> easy. I also think that this would the better
> approach because it should 
> not require so many other prom agjustments.
> 
> Thanks for any input,
> 
> Mike
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