MHD Updates - Shift Bog (Tq Lim 2048) Delete & PI Safety

glachhman

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Dec 16, 2016
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damnnnn this thing makes the car pull like a nonstop freight train paired with wotbox, I'm getting half engine overboost codes while brake boosting, anyone know how to prevent this?
 

DCook

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May 25, 2018
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damnnnn this thing makes the car pull like a nonstop freight train paired with wotbox, I'm getting half engine overboost codes while brake boosting, anyone know how to prevent this?
Tuner needs to code out brake plausibility code.

Ive tried racing brake boosting and i get the code and it goes into limp mode and i loose lol.
 
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fmorelli

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1.72b out this AM.

Filippo

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langsbr

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@jyamona, I was curious about the shift bog fix. MHD says (soft limiter) is now suppressed. Does that mean in all scenarios, or just when that particular condition is met for the shift bog? I saw someone said it was a logic rewrite, so does that mean the rev limiter has been changed from a fuel cut to an ignition cut fully? Also, does this have any impact good or bad when DSC/DTC is enabled?
 

Jake@MHD

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@jyamona, I was curious about the shift bog fix. MHD says (soft limiter) is now suppressed. Does that mean in all scenarios, or just when that particular condition is met for the shift bog? I saw someone said it was a logic rewrite, so does that mean the rev limiter has been changed from a fuel cut to an ignition cut fully? Also, does this have any impact good or bad when DSC/DTC is enabled?

There was always a fuel-cut limiter hiding behind the 2048 bog and soft limiter (closing throttle). It would kick in when throttle closure was not enough or not fast enough, etc. I removed all that, and just the fuel-cut limiter remains (like any normal sports car should have). No impact on DSC/DTC.
 

SlowE93

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There was always a fuel-cut limiter hiding behind the 2048 bog and soft limiter (closing throttle). It would kick in when throttle closure was not enough or not fast enough, etc. I removed all that, and just the fuel-cut limiter remains (like any normal sports car should have). No impact on DSC/DTC.
So would this be beneficial for me which is AT given the explanation given ? Or does that just work different from AT and MT ?
 

Jake@MHD

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So would this be beneficial for me which is AT given the explanation given ? Or does that just work different from AT and MT ?

Not really, unless your XHP shift points are higher than what is in your DME flash (this shouldn't be the case). In AT cars, the TCU determines when you shift so you should never hit the DME limiter.
 

SlowE93

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Not really, unless your XHP shift points are higher than what is in your DME flash (this shouldn't be the case). In AT cars, the TCU determines when you shift so you should never hit the DME limiter.
ok , cool. I am xHp and run stage 3. I run it paddle shift mostly and the tcu will NOT shift for me even if I hit the rev limiter as its basically full manual at that flash / stage. So would it benefit then ? Say doing a burnout at the track in 1st gear and hit the limiter ? Or hit a puddle in 2nd on the street and rpms jump to rev limit type scenarios.
 

Jake@MHD

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ok , cool. I am xHp and run stage 3. I run it paddle shift mostly and the tcu will NOT shift for me even if I hit the rev limiter as its basically full manual at that flash / stage. So would it benefit then ? Say doing a burnout at the track in 1st gear and hit the limiter ? Or hit a puddle in 2nd on the street and rpms jump to rev limit type scenarios.

I am not sure if the TCU is still keeping the RPM limited even if it is not shifting. Easy to tell, take a log of one of those situations hitting the rev limiter, and log Tq Lim Active. If it logs as 2048, you will benefit. If not, no benefit.
 

SlowE93

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Damn it. Well let me ask you this, any harm in running it ? I know another member said he is AT and flashed it. Dont know if it helped him or not or had adverse effect.
 

Jake@MHD

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Damn it. Well let me ask you this, any harm in running it ? I know another member said he is AT and flashed it. Dont know if it helped him or not or had adverse effect.

There should not be any harm or negative effects.
 

Terry@BMS

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I never added the torque limiter parameter to our general logs. But can if we need it for something in particular!
 

suspenceful

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I never added the torque limiter parameter to our general logs. But can if we need it for something in particular!

What is calc_torque in JB4 logs then? And since you're here... any idea why my MPH is way off?

Capture.JPG
 

Terry@BMS

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Calc_torque is calculated torque. It's useful when doing BEF tuning on automatics to ensure it's maxing out and you didn't screw something up in the torque tables. Not really useful for manual transmissions.

On MPH might be an app issue, I know Donnie has some updates pending for MPH. Have the CSV?