Burger Tuning JB4 for Kia Stinger!

[StungBlueGT2]

This is exactly what I was talking about. I can't make it happen it just happens sometimes and I wish it was like that all the time. If I go to 100% throttle while it's happening it seems to go away.

Lol same damn thing for me! Seems like 50 percent throttle sometimes pulls real hard and 100percent is that great

Yeah I keep hearing this from more and more people and wish there was a way to keep it in “super spool” mode all the time. So far we found that giving very little throttle initially(~10%) and then partially punching it to (40-60%) to get target boost to 1.0-2.0psi will usually replicate the effect. If you keep the throttle the same Target boost will stay around 1.5psi but will pull harder than 5-6psi.
PS-This only seems to work in Sport mode and haven’t been able to replicate it in comfort or Eco.

Hope this helps and let me know if those tips enable you to experience the super spool effect more often.

 

[Regs120]

I get the weird throttle response too. I imagine some crazy algorithm is at play in the ECU to stabilize the car or just plane bad throttle programming just to try to squeeze out another 1/10 gallon of gas. My car lags below 2K RPM with partial throttle giving little response as if it didn't want to climb. Then like what you guys experience when you try to wake her up with just 40-50 percent throttle the RPM's going through the roof as if you were flooring it.

 

[StungBlueGT2]

I get the weird throttle response too. I imagine some crazy algorithm is at play in the ECU to stabilize the car or just plane bad throttle programming just to try to squeeze out another 1/10 gallon of gas. My car lags below 2K RPM with partial throttle giving little response as if it didn't want to climb. Then like what you guys experience when you try to wake her up with just 40-50 percent throttle the RPM's going through the roof as if you were flooring it.

Unfortunately in boosted cars many different factors play a roll in how much boost, ignition timing & AFR is provided at any time. For example, IAT makes a huge difference in all those variables which makes the power from the same throttle input vary significantly. This makes it difficult to compare performance on different days, after multiple runs, etc.

Also, are you explaining these experiences based on Sport mode only, or Comfort/Eco? If the latter, yes you are correct the TCU is very relaxed with throttle response, and tends to shift too early even while rolling onto the throttle. Many have found that the JB4 works much better in Sport mode vs Comfort/Eco. The ECU & TCU tend to be on the same page in Sport, but in Comfort/Eco the TCU lags behind and doesnt calculate shift points correctly. That may be part of the problem.

However, in reference to the "super spool" effect I've read and believe its caused by a few variables working together creating a "perfect storm" of boost, timing & AFR for max acceleration. One explanation was that at partial throttle the BOVs stay slightly open allowing for dumped boost to be forced back into the intakes. This causes an exponential loop of intake air which causes our tiny turbos to spool & build boost significantly quicker than at full throttle.

That effect combined with minimal Target boost(1-2psi) from partial throttle may allow Ignition timing to be extra advanced which will maximize Torque/power.

I do know the ECU "learns" and advances timing based on octane, knock, boost, etc. so I believe this "super spool" effect is a factor of all those variables working perfectly together.

Hopefully more people keep having the same experiences so we can find a way to replicate it as needed. Hope this helps and keep the feedback coming.

 

[Maddog2873]

I'm curious, I don't have a JB4 yet, but I have noticed when I launch from a stop I will floor it and then let off after I hit the speed I am aiming at. Multiple times now I have noticed that as I go to let off the car seems to pull really hard. The butt dyno tells me harder than how it launched from stop. Am I feeling the same thing or no? Completely stock at the moment.

 

[Sabz]

I'm curious, I don't have a JB4 yet, but I have noticed when I launch from a stop I will floor it and then let off after I hit the speed I am aiming at. Multiple times now I have noticed that as I go to let off the car seems to pull really hard. The butt dyno tells me harder than how it launched from stop. Am I feeling the same thing or no? Completely stock at the moment.

I’m guessing your talking about letting off and the revs are hanging high so when you punch it your in the sweet spot and it does seem to pull harder ... I get the same feeling .. the car is now moving much faster so the engine doesn’t have to try as hard from when your at a stop.. car is damn heavy

 

[Angel]

@Terry@BMS how accurate is the E85 gauge in the Jb4? What number should it be to run map 3 or 5?

 

[Terry@BMS]

@Terry@BMS how accurate is the E85 gauge in the Jb4? What number should it be to run map 3 or 5?

It's a work in progress, not accurate enough for general use, yet. But we're working on it.

We suggest around a 30% E85 mix which is 5-6 gallons E85 and rest pump gas.

 

[Bigjohnb20]

Not Terry but my suggestion to you and anyone really who is pushing the car especially above stock power levels. Take the small amount of time to learn how to read logs. Then run the car log it , analyze and adjust, rinse and repeat.

Terry will be the first one to tout the great logging abilities of the jb4. It actually amazes me how many people here either dont know how or dont care about logging and monitoring their cars.

As to the question of how much e85 is needed Terry can give you a recommendation but I'm sure he will follow with the caveat that every car is different, people running a t different temps elevations levels of modification etc will all play a part in how the car responds to the different maps and fuels. I would imagine that in most cases there is a broad range or ethanol blends that should work with the higher maps. Ethanol in a gdi engine is extremely power at preventing knock.

My suggestion would be fill up to target e25-30. Dont worry if it's perfect just get close. The virtual gauge on the jb4 is a really cool tool to help. I imagine in Chicago much like here "e85" blends change pretty significantly with the seasons. Lower ethanol content in the winter. Anyway fill it up let er rip log it and see where you are at

 

[Adamdan]

Not Terry but my suggestion to you and anyone really who is pushing the car especially above stock power levels. Take the small amount of time to learn how to read logs. Then run the car log it , analyze and adjust, rinse and repeat.

Terry will be the first one to tout the great logging abilities of the jb4. It actually amazes me how many people here either dont know how or dont care about logging and monitoring their cars.

As to the question of how much e85 is needed Terry can give you a recommendation but I'm sure he will follow with the caveat that every car is different, people running a t different temps elevations levels of modification etc will all play a part in how the car responds to the different maps and fuels. I would imagine that in most cases there is a broad range or ethanol blends that should work with the higher maps. Ethanol in a gdi engine is extremely power at preventing knock.

My suggestion would be fill up to target e25-30. Dont worry if it's perfect just get close. The virtual gauge on the jb4 is a really cool tool to help. I imagine in Chicago much like here "e85" blends change pretty significantly with the seasons. Lower ethanol content in the winter. Anyway fill it up let er rip log it and see where you are at

Yup learning to read logs it’s awesome. I look at logs every time I fill up or change a map just incase. It only takes 15-30 seconds.

 

[Angel]

It's a work in progress, not accurate enough for general use, yet. But we're working on it.

We suggest around a 30% E85 mix which is 5-6 gallons E85 and rest pump gas.

Thanks

What about if I don’t want a full tank for the track. I want like a 1/4 tank? Would that be 3 gallons of 93 and 1 gallon of E85.

 

[Adamdan]

Thanks

What about if I don’t want a full tank for the track. I want like a 1/4 tank? Would that be 3 gallons of 93 and 1 gallon of E85.

There’s lots of E85 calculators online. There’s also apps you can download.

 

[Sabz]

Lol is there some place we can learn to read logs? I don’t need have jb4 but maybe someday and would love to learn before hand

 

[d34d1]

Is it possible to do continuous logs on the jb4, say for an hour? Or is there not enough storage space?

 

[Terry@BMS]

Is it possible to do continuous logs on the jb4, say for an hour? Or is there not enough storage space?

There is some internal cap set in there. But if you select the JB4 to autolog under heavy throttle, and set it to combine data in to one log, you can capture a days of racing in one file.

 

[GreySpector]

Finally narrowing down my limp mode issue.

E30 Mix + Map 2 or greater + Cold temperatures (<30f~) = Boost limp mode (P0100 ODB2 code).

Anyone else experiencing anything similar? It's easy enough to clear, but you have to turn off the car so it's a pain in the ass.

 

[Terry@BMS]

Read it with an OBDII scan tool that shows freeze frame data so we can see what the specifics are when you trigger it.

 

[Whiteybird]

Terry,

I read in another post you had your settings at 4psi for 1st and 0 for second so you can launch in your rwd car. I tried imputing the factors in my JB4 but it was still reading over those boost adjustment factors. Could you walk through how I can pull back my boost on 1st and second so I don’t blow the tires off under launch control?

Dyno’d 500tq to the wheels while having malfunctions on the dyno (not powertrain related), putting the BMS meth kit on and will have ET streets on this weekend to make some passes. I want to make the most out of the power I’m making.

Could you steer me in the right direction?

 

[Terry@BMS]

Set 1st gear to 5psi, save settings, post a log of a launch here so we can further evaluate for you!

 

[Whiteybird]

Set 1st gear to 5psi, save settings, post a log of a launch here so we can further evaluate for you!

Do I need to be in the manual mode or can I leave it in D? Or does it matter.

I’ll do a test and log later tonight.

 

[Terry@BMS]

Do I need to be in the manual mode or can I leave it in D? Or does it matter.

I’ll do a test and log later tonight.

Doesn't matter. I'd stay in D found it works just as well or better for doing runs.