Max safe EGT?

[CeglA]

Hello,

Whats maximum safe EGT with stage2 tune?
I logged my car and EGT reached 1800F during WOT. Looks quite high for me.

Regards,
Chris

[Suds]

So 1800F, that is past cherry red and more orange.
Are you catless?

I have a furnace at work that I heat treat metals in and will pull metals out in that 1200F-1900F range to air cool. It is amazing the colors that metals are at high temperatures.

Originally Posted by CeglA

Hello,

Whats maximum safe EGT with stage2 tune?
I logged my car and EGT reached 1800F during WOT. Looks quite high for me.

Regards,
Chris

[andrei.m4]

I think is normal, same to me by cary jordan stage2 map. I just installed 40%meth-60% water , meth injection kit aem v3 and seems now during WOT EGT go down instead go up, I start from 40mph with 1700 egt then during pull and meth injection even if I keep wot 3-4-5-6 at around 160mph egt is around 1600F so meth is a huge gain to lower temps. Also iat is lower with 5F than without meth.

[CeglA]

Originally Posted by Suds

So 1800F, that is past cherry red and more orange.
Are you catless?

I have a furnace at work that I heat treat metals in and will pull metals out in that 1200F-1900F range to air cool. It is amazing the colors that metals are at high temperatures.

I have downpipes installed. I left secondary cats untouched.

[andrei.m4]

Originally Posted by CeglA

I have downpipes installed. I left secondary cats untouched.

I am straight pipe and is same egt without meth injection.

[Bettertomorrow]

I have MHD stage 2, runs 91oct tune, use 93 oct, stock DP, AA Single Mid. My EGT hasn't seen above 1600 in 1st, 2nd, 3rd in 70s ambient temp. Perhaps would go higher in 90s.

[tomlong]

1,800F seems significantly above normal. What temperature readings are you getting for your O2 sensors?

Exhaust Gas Temperatures on regular pump gas I've seen for my car when I was on Stage 2 reach 1200-1300F on the higher side at most.

[RodF82]

How do you read EGTs?

[Wanted_M]

Originally Posted by RodF82

How do you read EGTs?

Thru BM3 or MHD logs if tuned, these are not individual cylinder read outs, what you get is cyl 1-3 (bank 1) & cyl 4-6 (bank 2).
Hope that helps.

[CeglA]

But there is no EGT sensor. EGT is calculated by ECU.

Here is my datalog with quite high EGT:
https://www.bootmod3.net/log?id=62ae...90c632883b2f7a

[Wanted_M]

I didn't see 1800 as you original post states, yes its theoretical calc. Logs looks ok to me but I noticed that your having some timing corrections on top with cyl 4/5. Check plugs and either re-gap them or tighten gap until correction cleans up. Boost looks ok, AIT @ 38c, STFT minor correction +1, WGDC 85%, but not seeing anything else jumping at me. What fuel 95 or 98 RON?

Do a full pull not starting at 5k rpm to get a full view or 4th gear pull (3k-7k).
Hopefully the gurus can jump in..

[Bettertomorrow]

OP, you asked about safe EGT for stage 2 but the datalog says stage 1? Assuming the log is for stage 2 and the label is incorrect.

Some interesting findings between your BM3 Stage 2 compared to my MHD Stage 2 (Multimap, Stage 2, 91 Oct tune, running on 93 Oct) in 3rd gear.

AFR
Your BM3 AFR did not go below 12.5 all the through the rev
My MHD AFR goes down to 12 flat at high RPM.

EGT
Your BM3 EGT went to 1650 in 3rd gear
My MHD EGT goes to 1600 in 3rd gear

Torque at clutch
Your BM3 max torque at clutch went to 503
My MHD max torque at clutch goes to 528

Timing
Your BM3 and my MHD go to 10 degrees at high RPM. (I am running 91 Oct tune with 93 Oct, are you running 91 Oct tune?)

Boost
Your BM3 max boost target was 22.5 and tapered off at high RPM.
My MHD max boost target is 22.4 and stays at 22.4 until 7300 rpm when I back out (Interesting, I have been under the impression that boost should go down at high RPM for safety reasons...)

WGDC
Your BM3 stayed at 86% approx, 84% at 6800 rpm.
My MHD stayed at 86% approx until 6000 rpm then started to go up, stayed near 90% up until 7300 rpm (could be why MHD boost held 22.4 until 7300 rpm).

If your log was indeed for Stage 1, now that is more interesting, especially the boost difference between BM3 Stage 1 Vs MHD Stage 2.

[CeglA]

Originally Posted by Wanted_M

I didn't see 1800 as you original post states, yes its theoretical calc.

I see 1806F when passing 6500rpm on 4th gear.
How reliable is calculated vs true egt?

Its Stage 1 BM3 multimap but due to higher afr and other changes its significantly stronger than regular Stage 2 ots map that I used before.

Fuel is shell ron100.

[Wanted_M]

Originally Posted by CeglA

I see 1806F when passing 6500rpm on 4th gear.
How reliable is calculated vs true egt?

Its Stage 1 BM3 multimap but due to higher afr and other changes its significantly stronger than regular Stage 2 ots map that I used before.
Fuel is shell ron100.

I would suggest to contact your tuner, send him a log for a revision and a tad more fuel to lower EGT's.

[CeglA]

Originally Posted by Wanted_M

I would suggest to contact your tuner, send him a log for a revision and a tad more fuel to lower EGT's.

Unfortunately BM3 does not customize ots maps. If I understand correctly in your opinion egt calculated little bit over 1800F is quite safe?

[Wanted_M]

No, too high

[Bettertomorrow]

Originally Posted by CeglA

I see 1806F when passing 6500rpm on 4th gear.
How reliable is calculated vs true egt?

Its Stage 1 BM3 multimap but due to higher afr and other changes its significantly stronger than regular Stage 2 ots map that I used before.

Fuel is shell ron100.

So it is BM3 Multimap Stage 1 with target boost of 22.5, higher than MHD Multimap Stage 2 with target boost of 22.4.

Very interesting…

[Dasky_spas]

Originally Posted by Bettertomorrow

So it is BM3 Multimap Stage 1 with target boost of 22.5, higher than MHD Multimap Stage 2 with target boost of 22.4.

Very interesting…

It's not so easy to find threads on egt. I've been hitting near 800c inmy tuned m850 but the temps spike more on part throttle. 550C cruising around town then around 600c on highway, and when throttle a bit more, temps jump above 700c. Seems excessively high. I did ceratoke my 200 cell hfdp so maybe that wasn't a good idea..

What's oem egt for the f80?

[Commanderwiggin]

You need an EGT sensor to read the EGT; the modelled values are going to be useless on a system that has different hardware and software changes. The BMW engineers have the modelling sorted for a factory car; no tuner is going to have that level of engineering equipment to edit the entire model for the car to be accurate with XYZ modifications.

[FaRKle!]

If you do find out your actual EGTs, you really don't want your EGTs getting to 1000C. On models where BMW does have EGT sensors the DME starts to pull power when EGTs get to 800C, and you get a CEL at 1000C. 1000C is close to the regime where the turbo metal fatigues.