[Tuned335i]

Originally Posted by Orb

To take that one step further. A differential pressure of 4.3 PSI is allowable between the manifold (ahead of the throttle plate) and the intercooler outlet. If we are running 14 PSI boost then we should expect to see spike in 18.3 PSI range at least when you shut the throttle.

Orb

All the pieces of the puzzle are coming together...nice work Orb

[OpenFlash]

Update: Meet up with a v2 customer who noted 18-20psi boost spikes on Saturday morning. Turned out he still had one of the boost solenoid bypassed. Put the hoses back to stock and boost spikes were gone.

Another cause of boost spiking would be not installing the new green loom included with the v2 upgrade kit (it has a red strip on it). Using the original green loom will cause sustained 18-20psi boost pressures.

Just an FYI...

-shiv

[e.n335]

^

Hi Shiv,

Thank you for the email I got yesterday. I will keep you informed about testing results.

- Eugen

[DrewKo]

Originally Posted by Orb

To take that one step further. A differential pressure of 4.3 PSI is allowable between the manifold (ahead of the throttle plate) and the intercooler outlet. If we are running 14 PSI boost then we should expect to see spike in 18.3 PSI range at least when you shut the throttle.

Orb

How does the spike when you shut the throttle resolve? In other words, where does the pressure go and does it make it to the manifold? Tx.

[OpenFlash]

Originally Posted by DrewKo

How does the spike when you shut the throttle resolve? In other words, where does the pressure go and does it make it to the manifold? Tx.

The excess pressure is relieved by the bypass valves.

-shiv

[Moggie]

Originally Posted by Orb

To take that one step further. A differential pressure of 4.3 PSI is allowable between the manifold (ahead of the throttle plate) and the intercooler outlet. If we are running 14 PSI boost then we should expect to see spike in 18.3 PSI range at least when you shut the throttle.

Orb

... but I'm seeing 18.1 spike when I open the throttle...

[OpenFlash]

Originally Posted by Moggie

... but I'm seeing 18.1 spike when I open the throttle...

Do you have a datalog of this?

shiv

[Moggie]

Originally Posted by shiv@vishnu

Do you have a datalog of this?

shiv

Earlier in this thread I posted a very short data log where I experienced a 1-2 second boost of 17.4 (but the log reads as expected at 14-15 range). I also posted examples of the expected spikes on sudden deceleration. BTW, by bypass is back to stock and I definitively have the correct green loom. In fact I've never had any procede install/running problems with v1.47 or v2.0.1. I'm only a little concerned because my newly fitted boost gauge is reading higher than I expect or would like.

Also, I posted a suggestion to you earlier about making the "autoboost" a user switchable function. It would make it easier to spot inconsistencies.

[OpenFlash]

Originally Posted by Moggie

Earlier in this thread I posted a very short data log where I experienced a 1-2 second boost of 17.4 (but the log reads as expected at 14-15 range). I also posted examples of the expected spikes on sudden deceleration. BTW, by bypass is back to stock and I definitively have the correct green loom. In fact I've never had any procede install/running problems with v1.47 or v2.0.1. I'm only a little concerned because my newly fitted boost gauge is reading higher than I expect or would like.

Also, I posted a suggestion to you earlier about making the "autoboost" a user switchable function. It would make it easier to spot inconsistencies.

No problem. I sent a map to scalbert and eugen last night that recalibrates the MAP sensor response curve (to read like a mechanical gauge), disables the overboost and does a few other things. I'm waiting to hear from them before releasing the map. For now, just drop the user TQ values 2-3% to drop peak boost.

Also, do you have any other mods or is your car 100% stock other than the PROcede?

Shiv

[Moggie]

Originally Posted by shiv@vishnu

No problem. I sent a map to scalbert and eugen last night that recalibrates the MAP sensor response curve (to read like a mechanical gauge), disables the overboost and does a few other things. I'm waiting to hear from them before releasing the map. For now, just drop the user TQ values 2-3% to drop peak boost.

Also, do you have any other mods or is your car 100% stock other than the PROcede?

Shiv

Thanks. Yes, Scalbert indicated he was testing a new map variation. From my conversations with him it appears we are seeing *exactly* the same thing. (The only subtle difference is that his MAP sensor reports -0.5 psi at idle, mine +0.3 But that's probably within tolerances..)

I am 100% stock other than procede.

[OpenFlash]

Originally Posted by Moggie

Thanks. Yes, Scalbert indicated he was testing a new map variation. From my conversations with him it appears we are seeing *exactly* the same thing. (The only subtle difference is that his MAP sensor reports -0.5 psi at idle, mine +0.3 But that's probably within tolerances..)

I am 100% stock other than procede.

Scalbert reads lower min pressure because of his altitude (1000-1200' above sea level). At 5000', it will read as low as -2 to -3psi.

Shiv

[satinghostrider]

Originally Posted by shiv@vishnu

Scalbert reads lower min pressure because of his altitude (1000-1200' above sea level). At 5000', it will read as low as -2 to -3psi.

Shiv

Shiv,

does a full exhaust system like Miltek and say a K&N drop contribute to overboost? Just curious..

Thanks in Advance.

[OpenFlash]

Originally Posted by elmariachi

Shiv,

does a full exhaust system like Miltek and say a K&N drop contribute to overboost? Just curious..

Thanks in Advance.

By "full exhaust" do you mean catless downpipes? If so, absolutely

shiv

[satinghostrider]

Originally Posted by shiv@vishnu

By "full exhaust" do you mean catless downpipes? If so, absolutely

shiv

nope, meaning stock downpipes. But pipes extending from downpipes all the way to the mufflers. Say how would high flow catted pipes be any diff in contributing to overboost?

Cheers!

[e.n335]

Originally Posted by shiv@vishnu

No problem. I sent a map to scalbert and eugen last night that recalibrates the MAP sensor response curve (to read like a mechanical gauge), disables the overboost and does a few other things. I'm waiting to hear from them before releasing the map. For now, just drop the user TQ values 2-3% to drop peak boost.

Also, do you have any other mods or is your car 100% stock other than the PROcede?

Shiv

Hi Shiv,

Yesterday ( before I got your new map ) I drove on the highway and got a limp mode while upshifting from 4th to 5th ( ~ 6.500 rpm, WOT, steptronic ). As ever in such a case I visited my dealership today to look what happened and to let the error clear. Code was "boost pressure too high".

This happened with my very conservative settings posted in this thread.

FYI.

- Eugen

[OpenFlash]

Originally Posted by elmariachi

nope, meaning stock downpipes. But pipes extending from downpipes all the way to the mufflers. Say how would high flow catted pipes be any diff in contributing to overboost?

Cheers!

I don't see high flowing cats really doing much over the stock cats. So I'm guessing they wont be a significant contributor to overboost. But I could be wrong.

Shiv

[OpenFlash]

Originally Posted by e.n335

Hi Shiv,

Yesterday ( before I got your new map ) I drove on the highway and got a limp mode while upshifting from 4th to 5th ( ~ 6.500 rpm, WOT, steptronic ). As ever in such a case I visited my dealership today to look what happened and to let the error clear. Code was "boost pressure too high".

This happened with my very conservative settings posted in this thread.

FYI.

- Eugen

There were two maps in that email. One was for 6AT and the other for 6MT. Did you use the right one? The 6AT version rolls off boost just before the automatic upshift. Thus reducing the intercooler tube pressure spike when that occurs when the throttle closes.

shiv

[satinghostrider]

Originally Posted by shiv@vishnu

I don't see high flowing cats really doing much over the stock cats. So I'm guessing they wont be a significant contributor to overboost. But I could be wrong.

Shiv

Cool. Everything i needed to know for my setup. Man your posts are faster than even the best technical support wait times.

[e.n335]

Originally Posted by shiv@vishnu

There were two maps. One was for 6AT and the other for 6MT. Did you use the right one? The 6AT version rolls off boost just before the automatic upshift. Thus reducing the intercooler tube pressure spike when that occurs when the throttle closes.
shiv

Yes, I used the AT map, I have the new green loom in place and the solenoid hoses as well ( stock ). Again, this has been with v2.0.2beta, not with the map you sent to me yesterday. I have loaded this map now, also the AT version.

[OpenFlash]

Originally Posted by e.n335

Yes, I used the AT map, I have the new green loom in place and the solenoid hoses as well ( stock ). Again, this has been with v2.0.2beta, not with the map you sent to me yesterday. I have loaded this map now, also the AT version.

oh i see. You have an email. Also, if you can, use the default user tq settings that are in the map I just sent you. They are conservative.

shiv

[LambOfGod]

I see that many of you are using a Vacuum / Pressure gauge to monitor your boost pressure. Typically, these types of gauges are somewhat unreliable for monitoring pressure spikes because the bourdon tube / mechanical type gauge cannot react fast enough to display the actual pressure spike. The only reliable way to measure pressure spikes is to utilize a strain type electronic pressure sensor hooked up to a computer or data logging system. Even with electrical devices there are plenty of issues that limit accuracy like heat and electrical noise. I'm no expert but I'd rely on the feedback from the engine devices before I'd rely on what a pressure gauge told me especially if the gauge is a standard run of the mill bourdon tube type gauge. Gauges are mass produced and usually are not well calibrated. For industrial usages the gauge must be tested by a 3rd party and come with a certificate of accuracy. These gauges are usually 4-6" in diameter and come with some type of adjustments for span and zero adjustment. Even with that the gauge is typically all over the map on hysteresis and repeatability. Gauges can be off by as much as 10% new out of the box. I suspect that if you see a spike of 18 psig the real spike is much higher than that. Compressed air is pretty tricky to control and spikes are inevitable especially in high volume applications. Every time you put your foot on and off the throttle there are huge swings in pressure that requires fast acting pressure management systems. A mechanical pressure gauge cannot keep up. Has anyone tried to monitor the pressure spike is a more sophisticated manner?

[LambOfGod]

BTW...you can tell when Eugen is pissed. His engilish goes to hell.