SFR ECU Reflash for 3.8 V6

3.8 V6 SFR ECU Reflash F.A.Q




- What does it exactly do?

1. Throttle response

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 

gas)

2. 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.


3. Advanced timing

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 

advertised. 

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)


4. 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. 


5. 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)

range ONLY. 

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 

ECUs.

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. 

Upgrades on Stage 1.5 

- More aggressive/responsive throttle response
- More horsepower/torque output
- upping more limit of torque management system 

Requirements for the Stage 1.5
- Intake
- Cat back exhaust (True dual type of exhaust or single outlet exhaust are recommended)
- 91+ octane fuel