No way would I go there again!
I had a 1985 BMW with a 3.5L that I turbocharged. I removed the stock EFI
system and installed a Eletromitive Tec3 system that was completely tunable
via a laptop. It had data logging that I used extensively. The problem
with this type of system is that you can always make changes to "improve"
things....you NEVER have it good enough and are constantly tuning it. Being
able to tune the spark advance, fuel delivery, boost, water injection and
many other parameters each with a 16 X 16 datapoint map is not always a good
thing.
I am very happy with my dizzy and 4100 thank you.
Duke
B382002037
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Theo Smit
Sent: Monday, February 15, 2010 11:17 AM
To: rfraser@bluefrog.com
Cc: 'Cullen McCann'; 'Tiger's List'
Subject: Re: [Tigers] Fuel Injection
Ron, and Cullen,
The Powerjection, like my BossEFI, has a learning mode. It uses a heated
oxygen sensor and PLX O2 sensor module and feeds its output back to the
controller.
A downside of the BossEFI system is that while the fuel map is finely
quantized over RPM and manifold pressure (it has bins for every 300 RPM
and every 2 inches of vacuum), the feedback mapping is coarsely
quantized (there is one bin for idle, RPM ranges are
0-1900,1900-3000,3000-4500 and 4500-redline, and there are only 5
manifold pressure bins). The problem with that is, if you have a couple
of points in the base map that are wrong, the feedback compensation will
fix it but then it changes the compensation factor for a broad range of
engine operation, and it causes a big shift in the mixture when you
enter an adjacent bin. The system also appears to not do much
interpolation between adjacent points (other than for RPM) so with a
mixture gauge connected to the PLX you can clearly see it change from
one bin to the next if you have a big step in the base map.
So you need to start with a fuel map that at least generally reflects
the overall demand curve from your engine, and THEN the self-learning
will allow it to tune itself as you drive.
The BossEFI does come with a datalogging feature that I haven't yet
fully explored, but I think that it will be a fairly important tool. It
shows the input parameters (RPM, temp, throttle, vacuum) and the output
pulse width as well as the O2 sensor reading. The plan would be to turn
off the feedback, do some RPM sweeps at various intake manifold pressure
levels, and see where the holes are.
Cheers,
Theo
Ron Fraser wrote:
> You need to look for the learn as you go systems. The earlier
> systems needed a PC to tune the system.
> The newer EFI is using the learn as you go system. There should be a
user
> interface with the unit that lets you scroll through initial parameters
and
> then the system tunes itself as you drive.
>
> I'm simply relaying information I have seen in Hot Rod Magazine. I have
no
> experience with any of these systems.
>
> Clearance to the firewall seems to be the only real issue.
>
> Ron Fraser
>
> -----Original Message-----
> From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
> On Behalf Of Cullen McCann
> Sent: Monday, February 15, 2010 10:16 AM
> To: Wally Menke; Tiger's List
> Subject: Re: [Tigers] Fuel Injection
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