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 2.0T Genesis Coupe ECU reflash.
I will be truly honest that we've been a bit afraid to put up a thread like this and stating all the facts.
This probably has been one of the most sensitive topic that we didn't want to cause any kind of frame or fanboy war like usual since we have many vendors offering their own ECU flash as well as piggyback and stand alone.
This is what I can think of right now but as we get more questions, I shall update on this.
Please keep it in mind that we've been offering this ECU reflash service since July,2010 yet we have at least 400+ customers out there running our ECU reflash as of today (Feb,2012)
Basic feel of reflash
2.0T SFR ECU Reflash F.A.Q
*Video of dyno results from SFR canned tuned on 2.0T with AEM intercoler kit+piping+downpipe+axleback exhaust.
~35rhwp ~70lbs/ft gains on Mustang MD Dyno with load!
* 4th gear results that should be easy 45rhwp 100lb tq on 5th gear
- 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
As you can see in the video, even with bumped RPM (7200rpm) whole transition to next gear comes way faster than
using stock throttle response and RPM reaction causing smoother transition between the shifting yet faster WOT times.
Upping the boost level
Stock boost level is usually 12-13psi peak and 10-11 psi hold being internally
waste gated type.
We usually offer about 4-5psi bump on the boost if the car is bone stock.
We give next next upgraded tune when the customer comes with
intake/exhaust/ most importantly FMIC which should bump at least 10-15rhwp
and another 10-20lb tq.
A lot of people never understood this but one of the most important
components for turbocharged car is FMIC where it really cools down the
HOT compressed air in the piping. Without having legit brand of core and
quality FMIC, heat soaking stock or low quality core will definitely cause
damage to the motor.
We will require to come with a legit brands (nothing that looks big but it's made
of cheap core)with good efficiency.
(We will recommend the brands by PM or email.. we don't want to name any brands online)
* A lot of people also make mistakes playing with stock actuator thinking adjusting it will add power.
It may add a bit more power that's when you are running with stock boost level
or little more with adjustment.
As soon as you add boost with ECU reflash, ECU will automatically think
actuator is over boosting and will put your car into notorious "Limp Mode".
We highly recommend not to play with actuator if you are thinking of getting
the tune in the future.
We find a lot of people try to adjust back to stock and it's very hard to go back
once it's been touched.
Same deal with the aftermarket boost controller, ECU will be limiting powers of
upping the boost without properly flashed ECU.
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.
We usually do not add much timing on stock turbocharged car for safety and
longer life for the motor especially the ones that do hardcore driving (Drifiting,
etc) on 2.0T motor.
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 or two step colder spark plugs for 93+ (octane) tunes (especially the custom tunes)
As most of you know, there are many different versions vary by the
SFR is very proud to say that we are the only company who can reuse your
factory equipped ECU version to flash your ECUs.
It is very important that though with same engine and other components, Hyundai has put in more safety features in newer year of ECUs.
Sure it could be Hyundai's protection not allowing the owners to play with their cars but we really think it's there for multiple reasons.
You can sure flash older year versions over newer years but it might cause constant limp mode problems, loosing power, Check engine light, immobilizer problems, knocking, etc.
It's already been discussed that it is not possible to flash back to exact stock tune while SFR is the only company that collects and saves all versions of data allowing us to go back to exact stock version.
Our each ECU flash is using all based versions after receiving,seeing,pulling the ECU version labelled on the ECU that all calibration data of each ECU will remain the same under same version.
It will allow customers to run their cars safely with less troubleshoot.
What we started offering is cloning or offering pretuned ECU for owners while
stock ECU is pretty much untouched.
We've sure already covered all versions of 2009-2012 stock ECUs that we can
offer pretuned ECUs flashed in the same versions of stock ECU.
The owners can visit the dealership for major services with their stock ECU
while they can switch back and forth with our pre-tuned or Core ECU.
We only offer canned tunes for stock turbocharger/injectors/etc.
Aftermarket intake/exhaust/o2housing/downpipe/mid pipe/FMIC are only
considered as "basic bolt ons".
We sure will be offering canned tunes for Staged packages in the future, and
we are still in process of collecting data for brands of
We highly recommend going for custom tunes if vehicle is equipped with bigger
injectors/turbos/etc since every car is different and it could be very dangerous
running canned tune for such equipped vehicles.
Rev limiter/Top Speed governor
We can only change the rev limiter on Manual tranny cars.
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.
- 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 can sure offer custom tunes for bigger turbo/injectors/etc that we've been doing.
You can either pay the visit to SFR USA or grab us while we are doing the tour in your area.
We refuse to tune the vehicles that are equipped with anything that we think it's dangerous or will give problems on the dyno.
Please contact and provide us pictures of the set up and list of parts on the car prior to the tune session so we can give some suggestions.
We've already done Evo X/Evo 8/9 kit/19T turbo/GT35R/Precision 6262 turbo, 550cc/750cc/1000cc injectors, etc.
450rhwp Precision 6262 Turbo custom tune
19T turbo upgrade tune (303rhwp 333tq/lbs)
Stock turbo Stage 2 ( 270rhwp 331tq/lbs)
Optional Launch control
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 02/25/2011, we've done little over 400+ 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)