Good evening,

I own a S4 B5 2.7 Biturbo.
After rebuilding it I have Problems with high EGT and after endless discussions I will try to ask in that forum because I think there are some experts around.

Long Story short: The Engine got rebuilt with new Pistons, rods and N/A Heads. New Valves etc.
Setup:
- complete RS4 Intake
- Hybrid Turbos (750) with K06 Exhaust Housing and 55mm inlet
- 3 inch DP
- Bosch 980 Injectors
- E3L Fuel Pump
- Big Exhaust Manifolds


Car runs great!
But if I go WOT the EGT rises extremly fast. At the end of 4th gear I hit easily 1000°C (1800°F) And thats not what i wanted

1. Its not Software related. I got my file checked 3 times and all of them said its fine.
2. There is enough Fuel. I checked with wideband O2 Sensor and everything operates as it should (afr 11,5 - 12,0)
3. I almost hit the MAF limit. So its somewhere around 600hp. Boost is 29 PSI tapering to 21PSI. Should be easy for the turbos.
4. I cant get "good" timing. Even on almost stock Ignition Map it pulls timing. (with 102 Octane Fuel!)

I think that 4) is my problem. On my other Setup before i could easily go with 20 degree BTDC under load. Now I can hardly get 15.

I also noticed, that my boot got sprinkled with black soot (little points all over the Trunklid).

I will pull the engine again to reduce the Compression Ratio. (at the moment 8.5)

Maybe someone has another Idea to look for.

Thanks in advance!

timing belt?

me7logger logs?

EGT and actual lambda missing from log, so nothing to see here.
Connect external WBO2 to rear o2 input(s) and log the signal alongside.

another log.

Its not way too rich if EGT is high.
Nye's question was on point. Do you out know what causes high EGT?
So far there has been no valid answer nor any proper logs with the relevant values.

Thus this thread is a waste of time. Enjoy continuing guessing

Thanks for your answers. Interesting article! I will read the FR pages too thanks for the hint.

But I think I went through most of the troubleshooting already.
I replaced plugs and coils. I switched complete fuel rail incl. Injectors from a working car and I lowered the compression. Nothing helps.

Hardwarewise everything should be fine. Im running TTH 750 turbos. They are quite big in Germany. A Lot of people are using their stuff. I have also no cats in place. Exhaust is free flowing 3.5 inch. Egt Sensors are working. Before the rebuilt everything Was fine. And its not that common that both Sensors give up at once.

The only thing that does not Work like i want it to is the ignition advancement. The ecu registers knock even on low loads on cyl. 5+6.

Maybe I will collect data with my innovate Tool. But as I said. It Shows exactly the value that is desired. So fuel should Not be the Problem. In a friends S4 with similar setup we can easily reach 25° BTDC ignition advance with no Timing pull. But my engine does not like it.

Its because of 5120 Hack. Multiply the Values by two and you have the right numbers =)