Originally Posted by
logger
Anyhow now my car is updated with the new sc24S4. It is stone cold, parked outside overnight with coolant at 12 degrees. The start showed the EGR process occuring. 1080rpm as expected, slight but lesser rough running from EGR and climbing EGT. Much less IGN advance than normal. Instead of the EGT and CAT temps rocketing to 665C as per normal though, they peaked at a far more conservative 435 degrees. Then dropped back to 250 degrees and 680rpm.
At this point I thought – Yes they have changed the way it does the EGR to keep the temps down when the engine is cold. I know it can handle over 1000 degrees in the exhaust, when warmed up and at higher RPMs. but 665 degrees in a stone cold engine strikes me as one hell of a temp rise. Especially seeing the revs are only at 1080 and not 4 times that at 4-5000revs when you see higher temps around 800+ when flogging the engine.
I thought I had found something sc24S4 is doing differently, I had better double check.
So I waited about 5 hours until my car was cold again. (never got above idle the first time). Ran the same test again and bugger me, it was back to its old ways of EGR and 665 degrees in 20 seconds. I have NFI why on one COLD start behaved differently to the other.
So this disproves my very speculative theory.
Back to the drawing boards.
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