by Richie O » Mon Apr 05, 2010 4:05 pm
BC847 wrote:Y'all are forgetting about the heat in the bearing cartridge "Coking" the oil.
Shutting the engine down without allowing sufficient time for the turbo (entering EGTs) to cool invites issues with the oil cooking (coking) thus leaving heavy deposits
Thats why I only cool the turbo when I am messing around or towing. The rest of the time its not hot enough to bother. The other day I towed a tractor with my dads 09 dmax. I pulled in the drive and got out without shutting off the truck. He said " You left the truck running ".

I unstrapped the tractor and took it off the trailer before I shut the truck off. I feel it has more to do with the temp of the turbo bearing ( center section ) then egt's. If I run 1200 degrees for 10 minutes then the turbo itself will be much hotter then a quick 1500 degree blast. I know if I did a long hard pull that within 30 or so seconds the egt will be back to normal and I'm sure the turbo is still hot as hell. I see lots of off road equipment go from full throttle to shut off many times a day. Most pit equipment operators will shut the engine off every load to do paperwork with the drivers. It goes from 100 % throttle digging to shut off.

1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k