[urq] EFI + MAC-14 maxing ataround 5k RPM

[Ado Sigal]

Oscilloscope could certainly give you this info.

Ado


Ben Swann wrote:

>>>>>
>
> How can we see what is happening to the coil primary?  How can you see if spark is dying
>at high RPMs?  Anything else to look at?
>  
>
 >>>

>Ben
>
> 
>
>  _____  
>
>From: QSHIPQ at aol.com [mailto:QSHIPQ at aol.com] 
>Sent: Wednesday, October 24, 2007 10:18 PM
>To: cody at 5000tq.com; quattro at audifans.com
>Cc: benswann at verizon.net
>Subject: Re: [urq] EFI + MAC-14 maxing ataround 5k RPM
>
> 
>
>In a message dated 10/24/2007 7:19:55 P.M. Central Daylight Time, cody at 5000tq.com
>writes:
>
>  
>
>>What you refer to is known usually as 'Hybrid Alpha-N' which was pioneered on the F40
>>    
>>
>IIRC. MS >can be run in speed desnity mode, MAF mode, alpha-n mode and hybrid alpha-n
>mode, but most >run speed density with only a very small handfull on either form of
>alpha-n. Anyways, yeah Bens >setup is on MAP vs RPM with modifiers like air temp,
>coolant temp, TPS accel enrichment (like >a carburettor accel pump).
>
> 
>
>It appears from below, that this setting is working, but I bet one has to become
>familiar with it using a 272 cam on a turbo audi....  
>
> 
>
> 
>
>  
>
>>I just looked at a log file where Ben started the engine and slowly let it run up to
>>    
>>
>5k. Duty cycle >is perfectly fine, never higher then 50%. From what I'm seeing it looks
>like an ignition missfire. >TPS stays perfectly still, but for one split second the
>vacuum goes away and simultaneosly the >O2 reads lean, while the MS tried to compensate
>for it and bounced the fuel up a bit. Everything >in the settings looks good too, BTW. I
>call ignition problem, but I have no suggestions for why :-(.
>
> 
>
>That makes more sense to me, it sure appears fuel is there.  Ignition:  RPM signal
>falling out - weak signal, worn teeth, bad sensor, wiring issue...   Arc: in the wires,
>distr, and/or rotor.  Bad plug/s.  Incorrect IAT sender.  
>
>
> 
>
> 
>
>  
>
>>MAP reprogramming is not something most can do, this is assembler language stuff burned
>>    
>>
>on >the CPU and frankly should never need to be edited.
>
> 
>
>Isn't there a software adjustment for load value, or is that adjusted for in the VE
>tabling?  There has to be a way to trim the load values without a reburn, since that
>will vary as MS is installed on various motors.  Curiousity more than something that
>needs to be done, it certainly appears fuel isn't the focus anyhow.  
>
> 
>
>Scott J
>
> 
>
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>
>
>  _____  
>
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