I put a bavauto chip in mine -- It does feel different driving it. Not faster,
really; but like the car is "lighter" (735i) definately peppy-er now...
According to them it remaps the entire throttle -- as I understand it; dinan
maps WOT (80% - 100%) but don't quote me on that at all!
For kicks I bought a $25 chip off ebay -- put it on. put the original chip in -
put the 25 back on -- but my bavauto on.
the 25 chip did feel different that stock, but not as much as the bav auto.
I'd guess the 25 chip guys bought (or borrowed) a real chip, used an eprom
burner they had work and burned a bunch of copies; stuck their own label on it &
figured they'd make a few bucks. (don't quote me)
The one I bought had outragous claims that just couldn't be true "40 hp gain"
and also claimed they developed the fuel mapping themselves. but it did do
I gave the chip to a friend, who put it in; took it out & tossed it. he wasn't
willing to risk damage to his baby with a no-name chip -- I would stick with
brand / respected names.
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You may get a slight horsepower increase in the newer cars or a significant
increase on the earlier cars. Rev limiter is usually bumped a couple 100
RPM. The top speed limiter is disabled. With the electronic throttle cars,
the throttle response is quickened. I don't think you'll see a fuel economy
R / John
I recently red that over time, the OBD2 system eventually overrides the
custom programming to get the car back to the design parameters. I
believe this happened with my wife's VW turbo. After about a year we
could hardly tell the difference between chip mode and stock.
Anyone else heard of this?
As a programmer, that's bullshit. The chip has the fuel/ignition map
that is used to run the engine, which can't be changed by OBD2, nor
would OBD2 know what the "design params" are in the first place.
That could well be. I attributed it to degradation of performance due
to the accumulating miles.
But some of those chip upgrades are piggy-backed onto the stock chip, or
attached via the diag connector, so it's conceivable that could be
happening with some designs. On the VW the CPU chip was unsoldered and
replaced, so that should kill any chance of it there.
I think the fuel map is used under normal operating conditions, but it
could be overridden by emissions code based on what the O2 sensor, for
example, is saying. That map is ignored, for example, in WOT
conditions. In any case, it's not an unreasonable theory to think that
something in the engine management code could override the fuel map.
On Mon, 05 Jun 2006 14:55:15 -0400, Nobody Important
Indeed, the rom-based maps are never ignored, as invoking such behavior would
overly complicate the entire engine management system. The values that the
maps cough up at any given moment are based on primary inputs such as throttle
position sensor, MAF, etc. Those values are then further adjusted based on
other real-time inputs such as you mentioned (o2 sensors, knock sensors,
torque sensors, etc).
"Performance chips" modify the base maps and rely on the ECU operating code to
account for the real-time environment...
You might want to tell us what model/year car you have. The EATS chip is
best for E34 models. The Conforti is equal to the EATS in the rest. The
Dinan has mixed reports from users.
I have the Conforti in my car, and I
have gained 2 mpg and it changes the whole ride. I don't have to "push"
the pedal to make it go. I have an 1994 530i in mint condition and the
chip removes the speed limiter, lets you rev to 7000 RPM, and gives better
gas mileage. Of course you have to use 91 or above octane forever, but I
do that anyway.
Here are the links for the chips:
Oh, and by the way, I have a V8 and the thing came with a rough idle. Now
I don't hear sqwat. It's tuned properly now. Doesn't vibrate or make
noise and for that alone I'd get this chip. People report slightly better
performance and acceleration with the EATS chip even though it's $50.00
less. But that may not be an option, if you have a brand new car.
The turner shark injector software(conforti) or the chip are what I would
consider installing. It's very easy and will change the entire ride of
the vehicle. Best of luck.
It's a low mileage 1998 Z3 2.8 I'm not familiar with the EATS, but I will
check it out. I've been hearing a few things lately that the Conforti tops
the Dinan in the HP category, but of course Dinan is recognized by BMW (if
that worth anything)
Be careful about the HP "spec" wars. In just about every case, the only
gain in horsepower is in an area of operation that you will use the
least: maximum rpm. Unless you are racing the car on the track and
wind it up to redline on a regular basis, the benefit you will get from
chips, intake, exhaust, etc. will be minimal.
What you really want is an increase in torque and power at lower/mid
rpms where you can actually use it. There are 3 general solutions to
1) larger displacement engine. Drop in an M3 engine?
2) forced induction. Turbo/super-chargers increase the effective
displacement by cramming more fuel/air into the limited space of the
combustion chamber and increase the available energy.
3) The cheapest of all... lower gearing. You will accelerate faster
but have a lower top-end. Do you want to go fast (high top speed) or quick?
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