[Gmecm] Tuning a larger MAF on L98

[Programmer]

How far is the sensor from your throttle plates ?

Lyndon.

----- Original Message ----- 
From: "Mike Poore" <mp at FlowersByValerie.com>
To: <gmecm at diy-efi.org>
Sent: Monday, September 26, 2005 11:50 PM
Subject: [Gmecm] Tuning a larger MAF on L98


> 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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