[urq] EFI + MAC-14 maxing ataround 5k RPM
benswann at verizon.net
Wed Oct 24 13:43:40 PDT 2007
Cody, all, I have taken it to the next level and have put the problem out on MSExtra
forum - I'm sure someone has seen this before:
If anyone has any idea if some ignition fubar with MAC-14 - like an automatic
transmission overrev softcut that I may not have wired properly, or something else like
that, please let me know.
I'll be putting more info. out on my website soon - wiring, etc. and of course PICTURES.
From: Cody Forbes [mailto:cody at 5000tq.com]
Sent: Wednesday, October 24, 2007 4:23 PM
To: Ben Swann
Subject: Re: [urq] EFI + MAC-14 maxing ataround 5k RPM
There is no percentage for pulse width, thats measured in time only. Duty
cycle is the percentage of time the injector is open vs. closed, 100% means
it's solid open, 50% meaning it's closed for an equal ammount of time that
I'll take a look at the files and get back to you this evening.
Ben Swann wrote:
> Here are files from today. Config - as it is/has been, brief log,
> and VETable.
> I did not not that pulsewidth or duty cycle peaking on the guage. I
> don't see the guage that shows percentage for pulsewidth as that
> shows millisec - did not see over 10ms even with problem this time -
> maybe log catches it. Duty cycle % did not go much over 50%.
> -----Original Message-----
> From: Cody Forbes [mailto:cody at 5000tq.com]
> Sent: Tuesday, October 23, 2007 10:55 PM
> To: Ben Swann; quattro at audifans.com
> Subject: Re: [urq] EFI + MAC-14 maxing ataround 5k RPM
> Which driver are you running your injectors off of? If you are using
> bank 2 driver then we are 75% closer. Bank 2 is being driven at
> double the
> duty cycle of bank 1, which indicates a setting off in the
> 'constants' menu.
> Also you are mega rich any time over atmostpheric pressure. From what
> I see
> you need to lean it out in the over 100kpa section, aim for between
> 0.65 and
> 0.7v on the O2 as long as it's under 200kpa.
> Ben Swann wrote:
>> OK check out the logs I sent you. If I recall, I was seeing some
>> high percentages on pulse width. I just don't understand why with
>> these injectors, unless I'm overfueling and perhaps with injectors at
>> around 100% any semblance of measured fuel output goea out the
>> -----Original Message-----
>> From: Cody Forbes [mailto:cody at 5000tq.com]
>> Sent: Tuesday, October 23, 2007 10:14 PM
>> To: Ben Swann; quattro at audifans.com
>> Subject: Re: [urq] EFI + MAC-14 maxing ataround 5k RPM
>> Ben Swann wrote:
>>> So if my max pw is 11.9 but if a rev. happens in only 11 ms then the
>>> injector pw > rev,
>>> so injector is open 100%.
>> On the main screen there is a PW gauge and duty cycle gauge. You can
>> the duty cycle gauge to see if it hits 100%, and you can watch the PW
>> to see if it bounces wildly when the engine starts cutting out.
>> Unless you changed something you are still using my setup with a
>> map. I rev my car to 8,000rpm no problem both when I had 42lb
>> injectors and
>> now on the 75's, so it's unlikely that your issue is there. Verify
>> you are
>> on 1 injection per revolution on the 'constants' screen.
>> How about taking a quick log and sending it to me? All you'd need to
>> do is
>> fire it up, let it warm up, and slowly increase revs until the
>> cut-out -
>> that should be enough for me to find any evidence if there is any to
>> Send your settings file too. We'll get this licked if I have to drive
>> my ass
>> back out there! I want to visit the Udvar Hazy Air&Space Museum annex
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