Since search function on this forum isnt' the best outthere and a lot of people don't tend to do some search
, we've decided to make a thread of FAQ on our 3.8 Genesis Coupe ECU reflash.
If you've been directed to this link means we are helping your lazy a$$
This is what I can think of right now but as we get more questions, I shall update on this.
3.8 V6 SFR ECU Reflash F.A.Q
- What does it exactly do?
Since Genesis Coupe has E-throttle body that is controlled by sending signals
with ECU, there are some delay/hesitations with throttle body. It also has to
do with notorious rev hang issues we've seen and experienced especially with
automatic tranny. With SFR reflash, we can control the timing and
responsiveness of throttle body remapping the logic of the throttle body.
Reaction time will be a lot quicker and all the lag that used to be with stock
tune will be gone. We don't want it to be too touchy especially for the
customers located in East coast where they get snow in winter, so we've put
it in the safe range. Going into full throttle (80% opening) is going to be
much faster resulting to reach desired RPM faster than stock tune. It also
saves gas mileage since car will be more responsive with throttle (with less
amount of gas on the foot moves the car... Injection = amount of foot to the
Unleashing torque management system
There is a torque management system built into Delphi 3.8 V6 ECU that is
limiting the power to the ground (Even with traction control off). It also has
to do with traction control/tire pressure sensor that ECU will automatically
limit off the power if it detects any loose tractions. We program the torque
management system to turn off the traction controll fuly when it's OFF.
Traction control will work just like stock when it's ON.
We give out timings depends on what octane rate you are running the car.
The higher octane you are running with the car, the more aggressive timing
we will be given to each flash.
MAF based 3.8 sensors/o2 sensors/ECU are very sensitive that slight change
in Octane/MAF flow rate will affect very easily. We recommend to stay with
flashed octane as always (You can go up but you can't go down on the
octane rate) in order to avoid on the misfiring issues.
Also note to use legit brand named Gas stations to get octane rate as
Giving more timing will make more power throught the RPM, and the customer
definately feel the aggressiveness of power and torque.
We recommend one step colder spark plugs for 93+ (octane) tunes (especially the custom tunes)
Trimming A/F ratio
3.8 ECU is targetted A/F ratio map that ECU try to adjust to the A/F ratio we
set at. It's little harder to adjust with some aftermarket intakes that
bypasses MAF sesnor some air (ex. INJEN) since ECU is not monitoring the
right amount of air coming in. However, after all these years of experience
we know exact what to give for such modifications/combinations with
exhausts and other aftermarket bolt-ons.
Giving out more aggressive A/F ratio will generate more power in desired RPM
range (or all range) but there is a risk of misfiring or shorten the life of motor.
Our canned tune is set at more than safe range.
Rev limiter/Top Speed governor
We can only change the rev limiter on Manual tranny cars though auto
tranny can go up to desired rpm in 5th and 6th gear.
The usual and proven RPM bump is @ 7200rpm. Neutral RPM rev limiter is still
@5000rpm like stock. We can always change this but in case of dealers
checking things out with possible alternations, we didn't want to put
anything too obvious. Top speed governor will be taken out and there will be
no limit to the top speed.
- Dyno vs Performance/Drivability gains?
Dyno gain on canned tune on 3.8 V6 is about 5-20 rhwp (dyno peak powers)
If you break it down some areas (RPM), it would be around 10-40rhwp gains
and 20-60lbs of torque.
A lot of people are so crazy about making some useless peak powers on the
dyno but as we stated above it's all about the drivability gains for 3.8 V6
Our canned tune for each octane rate is set at more than safe range of A/F
ratio/advanced timing that can be performed right without getting into
problems. Giving more aggressive timing or leaning out A/F ratio might yield
few more hp but it will not make a big difference and have more chance of
getting into problems (ex. Limp mode/misfiring/etc)
This is also one of the reasons why we've been suggesting our canned tunes
that will increase in overall performance and drivability while it's problem-free.
With canned tune, it's already proven by bunch of members to shave at
least .5- a second on the quater mile which is hard to believe while gaining
only such numbers on the dyno. This proves enough evidence that it's not all
about making useless numbers on dyno but tune must be targetted more
towards to drivability on 3.8 V6 ECU.
- Automatic vs Manual?
Performance gains on both tranny would be about the same. Due to increase
in response of throttle, people with manual tranny will have to relearn where
to engauge the clutch( it should not take long). Once you get the feel of it,
throttle is right there. Especially people doing some high skilled
drifiting/Touge/time attack should have advantages doing heel n toe/power
shifting/etc. Automatics have less chance to mess up on the shifting so
advantages on the flash is more towards to the transition on the shifting.
Due to throttle response changing gear would be faster/smoother. Going
on/off on the throttle will be much faster and responsive. (ex. You had to
downshift in order to pass somebody on the highway,
now it's just instant foot the pedal and power is right there)
We've seen avg of .7 seconds with manual tranny and .5 seconds with auto
tranny on quater mile times.
- What parts to buy/what mods to do?
We have brands and parts to recommend in order to maximize the outcome of
the reflash. We've done quite many custom tunes for certain brands and
combination. Some wrong modifications such as taking out all catalytic
converters will loose power (Your car isn't 80's Honda civic). o2 sensors not
only monitors the amount of o2 but the temperature of the cat and etc that
if it is not reading right bascially A/F ratio map on ECU that is connected to o2
sensor would also get messed up resulting high risk of running extremely lean
or rich. If it runs lean, ECU will pull timings resulting loss of power as well as
running rich. So please contact us for any modifications prior or after the ECU
flash. We'd be more than welcome to help out selecting parts as well as
locating and giving the best pricings as possible. We'd refuse to tune certain
cars that have the parts already on the car we aren't really sure about. I
If you are only putting in some bolt on parts such as intake/exhaust/etc, you
don't need the retune. Flahsed ECU will act just like stock ECU that will
relearn itself overtime. It only takes few seconds to reset the ECU by pulling
the ECU fuse in the fuse box located near the battery. No you will not loose
the flash by disconnecting the battery or pulling the fuse out. ECU flash is
permanenant. ECU will go back to when we first flashed the ECU after the
If you are coming with other tuner's tune, we will have to charge extra to
returning ECU back to stock first to get the basedata made. So far we are
the only vendor that reuses the ORIGINAL stock data converted to tuned
We don't guarantee anything about Hyundai's warranty with ECU flash. Get
this at your own risk just like any other aftermarket parts you put on.
However, it's not obivously seen or detected compared to any visible mods
such as intake/exhaust/etc.
We always use original stock data pulled then modified to tuned data, so all
the calibration data and other ECU functions remains exactly the same as
We also have just started offering the ECU core for those of people who are
really worried about their warranty, and you can keep you stock ECU and
Then, basically switch them out when you go to the dealer for any services.
As of today 09/26/2011, we've done little over 350 Genesis coupes ECU flash
(both 2.0T and 3.8 combined) since July 2010.
We've been getting bunch of positive and "WOW" responses, but feedbacks
are all over the places that can't get all of them at one place.
We've been collecting some of feedbacks that we can find and it's here:
(Please read through the initial thoughts and impression that fellow Genesis
owners have experienced)
<SFR> SFR 3.8 V6 Reflash Review & Feedback Thread