Noah Burns

iTrader: (5)

Since I've gotten into building road racing bikes over the last year or two I've wondered more and more why there is noone making an auto tune for us. there are several options for the bikes that provide an auto tune or tune on the fly, why can't we have that, or is there something like that and I just don't know about it?

mrvedit

Products like the Holley HP/Dominator have auto-tune.
This forum mostly covers GM PCM/ECM which do not have auto-tune.

soundengineer

iTrader: (16)

Define...your idea of... "Auto tune"

because ALL ECU's auto tune... its called Fuel trims...
GM chooses to use a narrowband o2 sensor, and only use them at part throttle and carry over positive trims to WOT...
Ford chooses to use a wideband o2 sensor, and fuel trims are used all the time

mrvedit

The GM's auto-tune is pretty much limited to compensating for manufacturing tolerances, normal wear and typical fuel quality. Since the OP mentions "racing" he is probably referring to aftermarket cams, heads, intake, etc. If any motorcycle factory ECMs can auto-tune for such aftermarket parts, that would be very impressive. Of course motorcycles are not subject to the same stringent CAFE and EPA requirements.

JakeFusion

iTrader: (7)

VE and MAF tuning are essentially "auto tuned" in EFI Live and HPTuners. You hook up your wideband and use the data logging capability of the software to see how far off you are from commanded A/F. They provide the correction, you apply to the table, and presto, tuned.

Is the bike software doing this automatically?

joecar

As soundengineer hinted at, those bikes come with wideband sensor that the ECM reads.

subeone

iTrader: (5)

megasquirt also comes with auto tuning capabilities

Noah Burns

iTrader: (5)

I forgot I'd posted this... yes the bazzaz autotune as well as the dynojet will basically tune for whatever we do to the bikes. We change parts, change fuel, whatever, go out, run a few laps, come in, apply changes and BAM tune is typically spot on, if not, a few more laps and apply again and it's dead on. The bazzaz even has a switch we can switch between race gas and pump gas tunes.

gpr

iTrader: (6)

There are huge differences in the two different systems. I use power commanders all day long, and the bike systems are essentially a piggie back system that modifies stock ecu outputs. Thus it intercepts the signals before the injector and changes it. While this does work, it isn't that great. Reason being is that you can not change very many parameters on a piggy back system.

Where efilive or hp tuners is actually modifying the tables inside the ecu itself. ON the bike tuners you are not changing anything from the factory, simply advancing the spark timing and increasing injector duty cycle for more fuel. The bike tuners are a very simple way to accommodate for aftermarket parts, once you drastically change a bikes engine though the limitations of these piggie back boxes are quickly found, as you have no adjust-ability on many tables you need.

btw, both hp tuners and efilive have a way to install a wide band and change your VE table, just like the auto tune does for the bike. Once setup you can take a car for a drive and it will recommend changes to your VE table.

Noah Burns

iTrader: (5)

I don't have the HPT pro cable so I can't hook a wideband up to it, unless there's another way of doing it that I don't know of with the standard cable.

mrvedit

Yes, you can run the Wideband through the A/C pressure signal. I cannot find the thread on HPTuners.com, but found a good article on a Corvette site.

http://www.corvetteforum.com/forums/...hp-tuners.html

Perhaps better, here is a link to a .doc file detailing the procedure on an Gen4 FBody:

https://ls1tech.com/forums/attachmen...and_wo_eio.doc

Noah Burns

iTrader: (5)

that's pretty slick!

will HPT still recommend the changes needed even though the input is coming through a different channel?

mrvedit

Yes, it makes no difference how the wideband signal comes in.