[Gmecm] Off idle stumble

[Mike Poore]

I removed the electronics from a stock MAF sensor, fabricated a base 
plate out of aluminum and TIG welded it to a larger pipe. I can't tell 
you the diameter of the pipe without taking it apart, but it is around 
3.75 in. To mount it I bought two of the smooth walled rubber ducts 
designed to replace the stock accordian ducts. Mid America and Ecklers 
sell them. They are tapered, so I could get them to fit by removing a 
couple of inches from the narrow end. The new MAF is now located halfway 
between the cold air box, that I made, and the throttle body, which 
allows for about 8 in. of straight unobstructed ducting on each side of 
the MAF. After the air clears the air filter, it goes around a 45 deg. 
turn, which is 50% bigger than the MAF and flows in almost a straight 
line right into the plenum.

Mike

Mark Romans wrote:

> How did you build your 1100 cfm maf?  Is it based on a stock one?
> Thanks!
> Mark
>
> ----- Original Message ----- From: "Mike Poore" <mp at FlowersByValerie.com>
> To: <Gmecm at diy-efi.org>
> Sent: Friday, March 10, 2006 7:03 PM
> Subject: Re: [Gmecm] Off idle stumble
>
>
>> No, it is an '85 L98 MAF system. Someone else wanted to know about my 
>> setup, so I'll go into some detail.
>>
>> It is an '85 vette. Right now the block is a 355, but will be 
>> replaced with a 420 cid. I have the TPIS Mini Ram, a 58mm throttle 
>> body, handmade MAF capable of 1100 cfm, handmade fresh air system, 
>> long tube headers, air system removed, cats removed, no egr,  hand 
>> ported heads, Ford Racing 40# injectors, 10:1 compression, Richmond 
>> ROD 6 speed transmission,  cap  dis ignition with remote coil,  and 
>> numerous handmade bit and pieces to get everything to fit. Everything 
>> is oversized for the 355, which is a bit of a challenge, but I can't 
>> afford to get the 420 cid block right now. I don't want to know what 
>> I have already spent not to mention the hours invested.
>>
>> Mike
>>
>> Darryl M Gilbert wrote:
>>
>>> Are you using a MAP??
>>> Darryl..
>>> On Fri, 10 Mar 2006 20:21:09 -0500 Mike Poore <mp at FlowersByValerie.com>
>>> writes:
>>>  
>>>
>>>> I now have the BLM at idle between 126 and 128. My newest issue is 
>>>> that since reducing the injector pulse width vs. LV8 by 20%  to get 
>>>> the BLM to 128 the engine has a hesitation off idle. I have a 58mm 
>>>> throttle
>>>> body, which is a little big for the current configuration, but will 
>>>> be perfect when I get the 420 cid built. For now, I need to make 
>>>> due with what I have. I tried adjusting the following:
>>>>
>>>> Delta TPS Accel. Enrichment Pulses from 4 to 5
>>>> Accel. Enrich. Delta TPS Scale Factor from 0 to 30%
>>>> Accel. Enrich. Delta vs. Delta LV8 scaled up 20%
>>>>
>>>> Even with all three adjustments, the hesitation still exists. Any 
>>>> suggestions?
>>>>
>>>> Mike
>>>> _______________________________________________
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>>>>
>>>>
>>>>   
>>>
>>>
>>>  
>>>
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>