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Old 15th July 2019, 11:18 AM   #1 (permalink)
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Hot EGTs, well maybe......?

Hi everyone, for those of you running north of 500hp do any of you know what sort of EGT's you're running on normal motorway / highway speeds 70-80mph (120kph)?
I was over at Oulton Park at the weekend watching Time Attack and on the way there I managed to hit 900'C, this was in 5th, steady cruising speed with moderate throttle going uphill (for a very short period). On normal flat surfaces I'm sitting anywhere between 650 & 750'C all the time. My EGT probe is right before the turbo entry and my AFR is next to the gearbox.
My AFR's are normal throughout (14.3 – 15.2 avg.) so it's not like I'm lean, but as I've nothing to compare 'highly strung normal' to, it'd be good to hear the thoughts of those who are pumping copious of V-power through their high HP motors.
I'm not having any issues at all, and she goes like a stabbed rat with rich AF AFR's on heavy / WOT, so I'm not seeing any signs of lean mixes, I'm just more concerned about running too hot and bursting into flames!!
As mentioned above, please, only those with first-hand experience of highly modded RB's, 'in car' at those speeds or with data logging. With the best will in the world, no armchair theorist please, I deal with those on a day to day basis at work and don't need any in my personal life!!
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Old 15th July 2019, 03:11 PM   #2 (permalink)
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900 deg is fine but you don't really want to be going much higher.

I know that one RB26 specialist (VERY well known and VERY well respected) used to map cars running on Power FC to EGT and not AFR at high rpm under load as this was safest for the engine.

At 900 deg I would expect you to be running around 11:1 AFR to keep the combustion chambers from running any hotter.
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Old 17th July 2019, 12:27 PM   #3 (permalink)
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Originally Posted by NICKH View Post
900 deg is fine but you don't really want to be going much higher.

I know that one RB26 specialist (VERY well known and VERY well respected) used to map cars running on Power FC to EGT and not AFR at high rpm under load as this was safest for the engine.

At 900 deg I would expect you to be running around 11:1 AFR to keep the combustion chambers from running any hotter.
Thanks Nick, appreciate the feedback
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