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lower temps are better, from a performance view as well
Quote:
Originally Posted by aureliusmax
should be at 190 degree F. Throw in a low temp thermostat in there. The higher temps are only for a marginal fuel economy and emissions crunch that Euro-Union regulated since the late 1990's which causes rapid acceleration and wear of all gaskets and seals and reduces peak power output and increases chances of misfiring.
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I've not changed my X5's T-stat, yet, since the electric fan is keeping my M54 cool enough, but I've always changed my T-stats to lower opening temperatures, for added performance or trying to avoid head gasket problems (particularly on iron block/aluminum head combinations).
My '04 Silverado 2500HD has a 6.0L iron block/aluminum head combo, but the viscous fan, large radiator and oil cooler have kept running temps below 210F, so I've not put in a low-temp T-stat yet, while my '98 GMC 5.7L iron/iron engine runs cool, using a 160F T-stat. All my previous trucks got the same T-stat as well, with E-fans and oil coolers too, while the '66 Chevelle got the full-race treatment, with multiple fans, coolers, electric high-volume water pump, and tuned (for best flow) water restrictor instead of a T-stat. Conversely, I kept stock temperature T-stats on all my last fuel-injected engines, since they were all 4-cylinders, and economy vs performance won out.
I've not driven the X5 enough to see if it even needs a different T-stat or any performance boost as yet; with 10+ compression and 4:10 rear gear, it seems spry enough for a 4600-lb truck to be. I just don't need any overheating problems, and will address them if they crop up (Stewart pump, and perhaps modifying the T-stat with drilled holes would be my first set of solutions). A Zionsville "BMW M54 Competition Thermostat Plate Kit", or a " Competition Thermostat Kit, AAF 80C" might be good to add, but not if the M54 might have emissions problems afterwards. My first instinct (as a former hot-rodder-racer) is towards the performance side, but my septuageneric-retiree side is leaning towards reliability, at a reduced cost.
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"
Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E
Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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