I know most of you folks already know about a couple of guys who have been
running without a
maf but using a GM ECM on their "race cars". I just wanted to pass along
that it is not just for "race cars" anymore.
I have been running Steve Yaklin's Maxeffort R mafless chip for a few days
doing some testing on driveability issues. With a few tweaks, and
a couple of changes here and there, my car is now running just as
well on the street with NO Maf, as it ever has before with a maf.
This chip design is currently in a couple of low ten sec cars and has
already proven itself at the track. I believe he has now expanded it's
ability to be fairly well mannered in street driving situations as well.
(Naturally, as with all aftermarket devices, this is for "off road use only"
;^) wink wink.
I have confirmed 20+ mpg at mostly highway driving on 100 mile loop. This
loop did have a 20 minute backup of traffic due to a Cardinal ball game
scheduled at the same time. (How dare they interfere with my testing ;^)
Looking at the scan tool files, I believe that there is even more highway
mileage to be had yet by utilizing his "lean cruise" tuning feature.
Considering I am running 55# injs I am impressed. I just haven't had
enough time yet to "play with all the gizmo's" but at this point I gotta
say this thing sure looks promising. I wish I could stick the car in a
cooler somewhere, to test the "COLD start", but will just have to wait till
October or November to do that. With the weather in my area this week,
midwest June-- it has cranked up and idled great, both warm, and after
sitting overnight, and with a couple of tweaks he did to the program it will
now drop right into gear without any warmup and drive away.
I am currently running 16# boost and some extra fuel while I tune for pump
gas, and expect to be able to turn it up and lean it out with no probs.
Naturally during beta testing, I like to stay on the conservative side and
slowly ease into things. As mentioned above, it's already been tested and
works good on the race applications, so I am concentrating primarily with
any driveability concerns.
Even though I am running a fat conservative tune on the car, the throttle
response is much better than ever before. With a conventional chip, tuned
this way it would be a pig out of the hole, but I crack into it off of idle
and it will roast the 295s like never before.
I have no idea when he will be ready to turn this thing loose to the general
public, but just thought I would let ya know that it sure looks promising to
me so far.,
due to text limitations on the bulletin board software I will cont this in part 2
part 2
For anyone who hasn't heard of this before, it does require that you have a
3 bar MAP and a standalone 3 wire harness going from the MAP to the ECM. A
modification is also required internally to the ECM. This mod does not
alter the normal maf use of an ECM. If for any reason you wish to put a maf
back in, (say for some sort of testing ;^) you just unplug the 3 bar
harness from the 3 bar MAP and all is back to normal, and you can run your
stock maf and whatever chip you had before. (Although I can't think of a
reason to :^)
Thanks go to Steve Yaklin for the help he's given me, and for developing
such a unit.
and another thanks to Bob Bailey for the ECM modification.
Dwight Hayden
PS (disclaimer) This setup is for the experienced tuner, just as a DFI or FAST/Speedpro would be. I would not recommend it to a beginner because it allows you to do so much, that if you don't know what you are doing, you will get into deep dewdo :^o But for a faster car and an exp tuner, it can be very advantageous.
Keep me posted. This sounds very intriguing. Thanks, Jeff