[s-cars] EM type, chip upgrades EGTs

[Mihnea Cotet]

Mike, as far as I'm aware, the KKK turbines tolerate a maximum of 950
degree C gasses entering them, meaning about 850 getting out. I always tune
for 830 degree C peak temperatures during sustained WOT or 3/4 throttle
(just because sometimes there's a lot of boost at 3/4 throttle and the ECU
won't necessarily use the WOT cells in the fuel map).

BTW, for Trevor, you don't want to run 5 WB O2 sensors after each cylinder,
just because they are only rated to a maximum of 840 degree C, and if
you're running 840 degree C before the turbine, you'll be losing HP by
running slightly too rich... but that's just my 0.02 worth of WBO2 sensors
knowledge.

Mihnea


At 07:50 15/07/2003 -0600, mlp qwest wrote:
>While looking for some better info on EGT ranges & limits I came across the
>following two sites / comments that you might (or might not) find of further
>interest:
>
>1st ~ somewhat on topic, but less than inconclusive comments / opinions of
>http://www.sdsefi.com/techegt.htm
>
>2nd ~ off topic, but interesting,
>http://www.geocities.com/rad87gn/tech/alcohol.html
>
>~-----Original Message-----
>~From: Trevor Frank
>~
>~Hmm, I was told 1k deg C before the turbo max, and somewhere under 800
>~deg C after.  I have both a WB o2 and an egt after the hot side, soon to
>~have one after each cylinder.
>
>And in the FWIW, 1,000? C ~> @ 1,832? F
>                      800? C ~>   1,472? F
>                  ---------    ---------
>                  @ 200?      @   360? F
>
>No idea how applicable in the gasoline (vs. diesel) world of applications
>and material limitations, but for the moment, a cursory perusal of the
>diesel crowd comments would lead one to think they advocate a much lower
>tolerable manifold EGT figure, ".... at 1270 F (688 C), the tips of the
>turbine blades begin to blow. .... The factory Garrett turbocharger will
>pull all day long at 1250, but in our opinion, 1270 degrees is the DO NOT
>EXCEED temp for sustained use."  from
>(http://www.fastdiesel.com/docs/egt.html )
>
>Likewise Banks suggests a range of 1350? F to 1400? F as "safe" for
>sustained diesel operation http://www.bankspower.com/Tech_whyegt.cfm
>
>
>Anyone got any better info on heat ranges &/or tolerances for (a) pistons,
>(b) valves & (c) turbocharger components?
>
>mlp