[Prince ///M]

From one of my BT scans.



The peak values are related to III and IV gear pulls near to redline.

The only mod is Procede V3 Rev I (stage 0 nonDD 85% ut).

In my opinion 750 Celsius (1380F) are way too much condidering that they are read after the turbos...

Are we sure that such insane values are "safe"?

[Jeller]

Seems fine to me. Usually over 1600 is something to get concerned about.

[Nikolas]

Your fine.

[Ilma]

Originally Posted by Prince ///M

From one of my BT scans.



The peak values are related to III and IV gear pulls near to redline.

The only mod is Procede V3 Rev I (stage 0 nonDD 85% ut).

In my opinion 750 Celsius (1380F) are way too much condidering that they are read after the turbos...

Are we sure that such insane values are "safe"?

That's an interesting post and question.

I would imagine that since there is a sensor there, the ECU would invoke a limp or safe mode if the exhaust temps hit a critical point.

But I don't really know....just speculating.

IMHO getting above 1000 F is not good.

[scottp999]

Interesting. Someone with Downpipes with magnaflow race cats (no manipulation of the O2 sensor) should do the same readings and see if the extra cfm flow keeps temps lower?

[scalbert]

There is no TC in the DP, that is calculated. And 1300 F is not a big deal either.

[OpenFlash]

Originally Posted by Ilma

That's an interesting post and question.

I would imagine that since there is a sensor there, the ECU would invoke a limp or safe mode if the exhaust temps hit a critical point.

But I don't really know....just speculating.

IMHO getting above 1000 F is not good.

I think you mean Celcius

[Prince ///M]

Originally Posted by scalbert

There is no TC in the DP, that is calculated. And 1300 F is not a big deal either.

If it is calculated I think that the value is derived from MAP,A/F, IAT and timing.

So it is MISCALCULATD because of Procede manipulations...

I'm more worried than before.

[OpenFlash]

Originally Posted by Prince ///M

If it is calculated I think that the value is derived from MAP,A/F, IAT and timing.

So it is MISCALCULATD because of Procede manipulations...

I'm more worried than before.

Then go back to stock.

Shiv

[Prince ///M]

Originally Posted by shiv@vishnu

Then go back to stock.

Shiv

Very informative as usual.

[scalbert]

Originally Posted by Prince ///M

If it is calculated I think that the value is derived from MAP,A/F, IAT and timing.

So it is MISCALCULATD because of Procede manipulations...

I'm more worried than before.

Why? I am serious. What is there to be worried about?

[Ilma]

Originally Posted by shiv@vishnu

I think you mean Celcius

Sigh! Some days I just don't know what I mean...

[Prince ///M]

Originally Posted by scalbert

Why? I am serious. What is there to be worried about?

I think that the calculation is there for a resason... maybe because turbos have temperature limits (1050 celsius if I remember correctly).

Because of values modification from piggybacks (also JB3... par condicio ) this kind of calculation is useless and we can't have an estimate of real exhaust temperature.

So my concern can translate in the following question: "what kind of EGT are we running at 13-14 psi to redline?".

No one seems to know the answer... or want to share information (sustained by logs).

[WhiteSled]

You can always run a simple test to confirm the accuracy of these readings. As stated above, the rear o2 sensors do not have temperature probe inside them so it is all based/guessed of the ecu calc. Run the car to whatever 600 degrees, turn it off with the test still runing, wait 5 seconds, turnt he car back on. I'm willing to bet those 600 degree readings will drop into the 200 degree range, dropping 400 degrees C in 5 seconds is impossible

[Prince ///M]

Originally Posted by WhiteSled

You can always run a simple test to confirm the accuracy of these readings. As stated above, the rear o2 sensors do not have temperature probe inside them so it is all based/guessed of the ecu calc. Run the car to whatever 600 degrees, turn it off with the test still runing, wait 5 seconds, turnt he car back on. I'm willing to bet those 600 degree readings will drop into the 200 degree range, dropping 400 degrees C in 5 seconds is impossible

Of course... the matematical model needs a starting point (192 Celsius from my logs); but I think that it will recover the gap very soon (1-2 seconds) depending on engine operational conditions.

BTW, my intention is not to validate BMW heat transfer model, but to understand if our engines are running fine... quite different objective.

[Nikolas]

Those are perfectly normal readings for a turbo car - in fact a little lower than my STI ran.

[WhiteSled]

Originally Posted by Prince ///M

Of course... the matematical model needs a starting point (192 Celsius from my logs); but I think that it will recover the gap very soon (1-2 seconds) depending on engine operational conditions.

BTW, my intention is not to validate BMW heat transfer model, but to understand if our engines are running fine... quite different objective.

Like i stated before, I never did this test on my 1, but did it on a previous car and once shut off/restarted, the temps went from 700c to 200c and then slowly crept up to idle temps which were around 1100F not C. So basically, 1450ish F, trun the car off turn it back on, 600F, let it idle/drive around without hitting boost for 20 min and i would never see anything above 1050F

[scalbert]

Originally Posted by Prince ///M

I think that the calculation is there for a resason... maybe because turbos have temperature limits (1050 celsius if I remember correctly).

Because of values modification from piggybacks (also JB3... par condicio ) this kind of calculation is useless and we can't have an estimate of real exhaust temperature.

So my concern can translate in the following question: "what kind of EGT are we running at 13-14 psi to redline?".

No one seems to know the answer... or want to share information (sustained by logs).

Most likely high temperatiure limits are used. They are not relevant for operation and probably just used as a guide but not operation.

If you want to kinow for sure, pull a rear O2 sensor and drop an EGT gage in there. But regardless, we know the A/F and the iginition timing, so we can assume they are safe. But if one really needs to know, a type K TC has your name on it.

[Prince ///M]

Originally Posted by scalbert

Most likely high temperatiure limits are used. They are not relevant for operation and probably just used as a guide but not operation.

If you want to kinow for sure, pull a rear O2 sensor and drop an EGT gage in there. But regardless, we know the A/F and the iginition timing, so we can assume they are safe. But if one really needs to know, a type K TC has your name on it.

You are perfectly right... but sound a little bit strange to me that after 3 years of N54 tuning no one already have this kind of data.

[scalbert]

Originally Posted by Prince ///M

You are perfectly right... but sound a little bit strange to me that after 3 years of N54 tuning no one already have this kind of data.

I know Shiv did install EGT sensor during early testing but did not hand out data for competitive reasons.

[Prince ///M]

Originally Posted by scalbert

I know Shiv did install EGT sensor during early testing but did not hand out data for competitive reasons.

Wow... N54 community is very, very strange.

In Scooby forums you can find tons of data and suggestions on how to self tune your cars (not to talk about DME logic and maps fully encripted).

Maybe something will change soon...

[scalbert]

Originally Posted by Prince ///M

Maybe something will change soon...

I have been planning on dropping an EGT gage in sometime but haven't had the chance. I have an LM-1 to get the accurate A/F ratios. Maybe a weekend can open up to get the desired data.