Drag/Acceleration Weight of the worlds fastest Stinger....

[Not Here Anymore]

12 to 14 psi stock. When intake temps are below about 60 F you would see 12 and starting at about 90 you see 14.
The piggy backs are in the 18 to 22 range. Race chip race mode 19.5, jb4 map2 is plus 4 so 18 psi and can go plus 8 so 22 psi and not positive on lap3 but i think thier mode 2, 93 octane is 20.7 and wmi mode 3 is 21.5 psi.
Tork stage 1 is 18 psi, 92 octane and target for stage 2 is 21 - 22 psi.

Edit: i do see 3 psi drop at cold temps 19 vs 22 so i could see stock going down as low as 10 or 11 when cold, but 14 is stock max.

Thanks Tonkabob and Terry for the great information, this is what truly makes this Stinger Site so dam awesome just my personal opinion

 

[xot1]

12 to 14 psi stock. When intake temps are below about 60 F you would see 12 and starting at about 90 you see 14.
The piggy backs are in the 18 to 22 range. Race chip race mode 19.5, jb4 map2 is plus 4 so 18 psi and can go plus 8 so 22 psi and not positive on lap3 but i think thier mode 2, 93 octane is 20.7 and wmi mode 3 is 21.5 psi.
Tork stage 1 is 18 psi, 92 octane and target for stage 2 is 21 - 22 psi.

Edit: i do see 3 psi drop at cold temps 19 vs 22 so i could see stock going down as low as 10 or 11 when cold, but 14 is stock max.

Sorry for the stupid question but what is the logic behind cold air => use less boost?

 

[brancky3]

Sorry for the stupid question but what is the logic behind cold air => use less boost?

The air is more dense which means you need less boost pressure to obtain the same air mass compared to warmer weather

 

[xot1]

The air is more dense which means you need less boost pressure to obtain the same air mass compared to warmer weather

Thank you!!

 

[Tonkabob]

The air is more dense which means you need less boost pressure to obtain the same air mass compared to warmer weather

Thats one theory but dont think it's accurate nor is the load based boost entirely accurate.

"The ECU is load based, but boost targeted.

So, if the load is not set high enough, it will not hit target boost. If the target boost is to low, it will over boost based on load. " (per Tork)
Kia lowers the boost in cold weather to avoid overboost (per Lap3).

 

[Angel]

I literally lost everyone on this thread!

WTF people let’s start speaking English here.

LOL JK

 

[Tonkabob]

I don't know why you keep insisting that 14psi stock is normal when literally every map 0 JB4 log proves this wrong

Terry just agreed the max stock boost is 14 but here is my stock dyno showing 13.87 psi. Wasn't able to find Locke's boost gauge pic showing 14 psi.
I guess the jb4 log is wrong.

 

[Angel]

Does it really matter what the stock psi is ? Is it that big of a deal? I mean it can be anywhere from 10-14 psi depending on conditions. What is the point of the argument to be made? Everyone is going back and forward on stock psi.

Most I seen a JB4 is like 18 psi. Ecu psi the most I seen is 12 I believe. Again seems like a redundant argument.

If the point is that the JB4 is wrong then state that with with evidence or whatever the point that is trying to be made.

I have a physical boost gauge. I can test this When I have time since I have a JB4 and AWD stinger. But it seems like I would be wasting my time to be honest, hence the reason I have not done it yet.

A physical boost gauge and a electronic sensor might not be exact. Not just in Stinger but any car.

 

[Terry@BMS]

Thats one theory but dont think it's accurate nor is the load based boost entirely accurate.

"The ECU is load based, but boost targeted.

So, if the load is not set high enough, it will not hit target boost. If the target boost is to low, it will over boost based on load. " (per Tork)
Kia lowers the boost in cold weather to avoid overboost (per Lap3).

lol what? Neither of those statements even make sense?

To simplify things a bit for you "load based" means the vehicle is targeting a specific torque output regardless of operating conditions. Load target is dynamic based on operating conditions to keep torque consistently on target. During warmer and higher elevation conditions load is mapped higher to overcome the extra pumping losses in an attempt to keep torque similar to colder and lower elevation conditions, for example. There is an upper and lower limit on the load range and conversion tables to convert that load request to a specific boost target which the WG PID system then attempts to target.

So when you're talking about peak boost stock it's going to vary a lot. I've seen it as low as 10psi and as high as 14psi. It might even have a slightly wider range and I just haven't encountered it yet. Start out in a 30F day at sea level and you should hit around 10psi peak. Race up a 6000' mountain where it's 90F at the top and you'll probably see well over 14psi peak stock.

 

[Tonkabob]

I literally lost everyone on this thread!

WTF people let’s start speaking English here.

LOL JK

Not really that important but Stungbluegt2 is trying to claim tune superiority since JB4 runs lower boost which isn't the case. That's all.

 

[Tonkabob]

lol what? Neither of those statements even make sense?

To simplify things a bit for you "load based" means the vehicle is targeting a specific torque output regardless of operating conditions. Load target is dynamic based on operating conditions to keep torque consistently on target. During warmer and higher elevation conditions load is mapped higher to overcome the extra pumping losses in an attempt to keep torque similar to colder and lower elevation conditions, for example. There is an upper and lower limit on the load range and conversion tables to convert that load request to a specific boost target which the WG PID system then attempts to target.

So when you're talking about peak boost stock it's going to vary a lot. I've seen it as low as 10psi and as high as 14psi. It might even have a slightly wider range and I just haven't encountered it yet. Start out in a 30F day at sea level and you should hit around 10psi peak. Race up a 6000' mountain where it's 90F at the top and you'll probably see well over 14psi peak stock.

My 13.87 PSI was at 50 foot elevation in a 70 degree room so not extreme conditions.
I think your load based explanation is also over simplified as there are many ECU tables for air charge that play a major factor. The max air charge converted to PSI from hectopascal is 16.6 PSI but don't think anyone has seen that stock since this table nor a torque target ist the only factor. But I think you and John have had these pissing matches before.
Bottom line 14 PSI is commonly seen in normal conditions on multiple cars with multiple different gauges but rarely seen in a jb4 log file. If map 2 runs 18 PSI rather than 16 PSI and WMI is running 22 PSI rather than 20 PSI people should know that.

 

[Terry@BMS]

Your "13.87 psi" presumes a precision in your boost monitoring that I doubt exists. Gauge readings are always +-1psi at a minimum. The X drive cars being heavier with more drivetrain loses also target a little more load than RWD cars, all else being equal.

By popular demand we did rescale the JB4 boost reading slightly in v10 firmware. I just don't want to hear any crying now if customers are actually making less boost than the log shows since the v9 firmware and previous readings were based on the boost sensor specification sheet from Bosch.

Regarding the rest of your post John is probably looking at the upper boost cap not the upper load cap. They may or may not be the same. It's certainly plausible factory boost could float up to 16psi under extreme conditions.

 

[Tonkabob]

Your "13.87 psi" presumes a precision in your boost monitoring that I doubt exists. Gauge readings are always +-1psi at a minimum. The X drive cars being heavier with more drivetrain loses also target a little more load than RWD cars, all else being equal.

By popular demand we did rescale the JB4 boost reading slightly in v10 firmware. I just don't want to hear any crying now if customers are actually making less boost than the log shows since the v9 firmware and previous readings were based on the boost sensor specification sheet from Bosch.

Regarding the rest of your post John is probably looking at the upper boost cap not the upper load cap. They may or may not be the same. It's certainly plausible factory boost could float up to 16psi under extreme conditions.

Good to see you updated the firmware.
I was in RWD mode on the dyno. But Locke has an AWD and hit his 14 PSI on the road with his gauge. He does drive it in RWD mode so I guess we may be able to get him to test that theory for science. @Michael Locke ? I haven't seen him on the forums much lately....
That was just one table I was referencing so not implying stock would/ could hit 16 PSI. I just don't know.

 

[Angel]

Your "13.87 psi" presumes a precision in your boost monitoring that I doubt exists. Gauge readings are always +-1psi at a minimum. The X drive cars being heavier with more drivetrain loses also target a little more load than RWD cars, all else being equal.

By popular demand we did rescale the JB4 boost reading slightly in v10 firmware. I just don't want to hear any crying now if customers are actually making less boost than the log shows since the v9 firmware and previous readings were based on the boost sensor specification sheet from Bosch.

Regarding the rest of your post John is probably looking at the upper boost cap not the upper load cap. They may or may not be the same. It's certainly plausible factory boost could float up to 16psi under extreme conditions.

The only I care about the V10 firmware.

Your "13.87 psi" presumes a precision in your boost monitoring that I doubt exists. Gauge readings are always +-1psi at a minimum. The X drive cars being heavier with more drivetrain loses also target a little more load than RWD cars, all else being equal.

By popular demand we did rescale the JB4 boost reading slightly in v10 firmware. I just don't want to hear any crying now if customers are actually making less boost than the log shows since the v9 firmware and previous readings were based on the boost sensor specification sheet from Bosch.

Regarding the rest of your post John is probably looking at the upper boost cap not the upper load cap. They may or may not be the same. It's certainly plausible factory boost could float up to 16psi under extreme conditions.

so for the new v10 firmware update we will be getting less boost? Or just reading less boost?

Not sure if I want to update now lol.

 

[Terry@BMS]

The only I care about the V10 firmware.


so for the new v10 firmware update we will be getting less boost? Or just reading less boost?

Not sure if I want to update now lol.

Just the reading, no actual change to boost pressure.

 

[Terry@BMS]

Good to see you updated the firmware.
I was in RWD mode on the dyno. But Locke has an AWD and hit his 14 PSI on the road with his gauge. He does drive it in RWD mode so I guess we may be able to get him to test that theory for science. @Michael Locke ? I haven't seen him on the forums much lately....
That was just one table I was referencing so not implying stock would/ could hit 16 PSI. I just don't know.

I've checked ours with a precision mechanical gauge plenty of times. I'll make a video later showing you both side by side.

 

[Tonkabob]

And if I read your comment correctly the V10 will show slightly higher boost as you didn't want customers saying they were getting lower boost than the log showed.

 

[Terry@BMS]

Checkout the v10 firmware notes for details.

 

[TorkMe]

I have Terry on ignore, but have been asked to come in here and explain this.

1. The ECU is not load based, the load is not even in the top 3 for priority.
2. The ECU does in fact have target boost maps.

I shouldn't have to do this, I shouldn't have to stop a vendor from lying to the masses in this community. Why is it always me, coming in here and giving the information, taking screen shots and proving this nail bitter wrong, again?

Guys, this should not be my job. I should be able to sell you parts and you should be able to ask questions freely of any member and get accurate answers, not BMW regurgitated bullshit.

Here are the screen shots showing actual maps from the ECU identifying boost limits and target boost points. These are just a few of the maps that are actual boost "targets". The ECU uses several limits and control parameters to achieve its target boost and torque, but... it is not and I repeat not a load based ECU only.

 

[xot1]

I have Terry on ignore, but have been asked to come in here and explain this.

Lol is this kintergarden?