From what I have seen OAT don't effect oil temps as much as coolant temps. Once the difference in temperatures between coolant and oil are higher than ~20* is when the oil temp climbs and brings the coolant up as well.
Your thoughts
- Thread starter Chevy1925
- Start date
Hey James. So this is coming from me, and we all know I don't know shit:rofl:
I have a few things to ask and add.
1) are you running an upgraded trans cooler? I ask cuz it is tied into the coolant system, and I'm pretty sure you have a built trans, so the added line pressure almost necessitates an upgraded trans cooler to maintain temps . With that in mind when your towing the amount of trans heat grows exponentially couple that with extreme ambient air temps and this only gets worse, even the slightest added heat load running through the coolant stack will drastically affect ALL the fluid temps as they are all tied together, the coolant is burdened with cooling the oil, engine, and trans fluid. I can't help but believe an upgraded trans cooler would help even If just a little.
2) with twins your cooling 2 turbos with the oil, and I'm not sure if the atmospheric turbo is cooled by coolant as well, but you can see how it would affect over all fluid temps, so it seems reasonable to me that on extended grades you would experience heat soak both in the fluid and in the engine bay from the extra turbo, with that being said, have you thought about adding hood vents? Also, having the twins I really think an upgraded intercooler is totally necessary! Especially since yours is leaking...
3) I think you are taxing everything running the 3.73 gears on those badd ass 37's
I really think you need to bite the bullet on those gears buddy:hug: that should help you tons
Also, I'm pretty sure the killer bee set up, and any aftermarket oil cooler set up wont drastically affect oil temps and that is not the design or reason of them as much as they are supposed to help reduce runaway temps and temp spikes, keeping sustainable oil temps under extreme duty and helping to ward off heat soaking, idkfs...
So recap, if I were you this is what I would do... Trans cooler, intercooler and gears, possibly hood bents, then re-evaluate
Anyways, there's my input, for what it's worth. Good luck man
I have a few things to ask and add.
1) are you running an upgraded trans cooler? I ask cuz it is tied into the coolant system, and I'm pretty sure you have a built trans, so the added line pressure almost necessitates an upgraded trans cooler to maintain temps . With that in mind when your towing the amount of trans heat grows exponentially couple that with extreme ambient air temps and this only gets worse, even the slightest added heat load running through the coolant stack will drastically affect ALL the fluid temps as they are all tied together, the coolant is burdened with cooling the oil, engine, and trans fluid. I can't help but believe an upgraded trans cooler would help even If just a little.
2) with twins your cooling 2 turbos with the oil, and I'm not sure if the atmospheric turbo is cooled by coolant as well, but you can see how it would affect over all fluid temps, so it seems reasonable to me that on extended grades you would experience heat soak both in the fluid and in the engine bay from the extra turbo, with that being said, have you thought about adding hood vents? Also, having the twins I really think an upgraded intercooler is totally necessary! Especially since yours is leaking...
3) I think you are taxing everything running the 3.73 gears on those badd ass 37's
I really think you need to bite the bullet on those gears buddy:hug: that should help you tonsAlso, I'm pretty sure the killer bee set up, and any aftermarket oil cooler set up wont drastically affect oil temps and that is not the design or reason of them as much as they are supposed to help reduce runaway temps and temp spikes, keeping sustainable oil temps under extreme duty and helping to ward off heat soaking, idkfs...
So recap, if I were you this is what I would do... Trans cooler, intercooler and gears, possibly hood bents, then re-evaluate
Anyways, there's my input, for what it's worth. Good luck man
Well the one thing with adding a better trans cooler is the fact it will dispurse heat more, meaning that removal of additional heat would then enter the rest of the cooling stack, but i can see that a cooler temp from the cooler due to the better dispursion of the heat could help as well. So in theory, they both cancel each other out. Im still running the stock trans cooler as it is cause i dont see high temps like others say. highest the trans get pulling is 200-210*. even sitting in traffic in the 115* heat we had a few weeks ago i never crested 210*. my trans has always ran cooler than other guys. This was even watching the temp on EFI Live so i could make sure the gauge wasnt off.
totally agree the second turbo is not helping my oil issue but that is why i have the huge ass oil cooler on the front. the idea was based on other peoples findings would be that oil temps could stay around 230-240* while towing up big hills in the heat, granted no one had done it in the heat we have here. after the shrouding and that on the cooler, im actually happy with how its doing. why its getting hotter than it should i believe is another issue like the leaky intercooler.
gears will come one day soon. not somehting i really wanna do in the summer here lol
totally agree the second turbo is not helping my oil issue but that is why i have the huge ass oil cooler on the front. the idea was based on other peoples findings would be that oil temps could stay around 230-240* while towing up big hills in the heat, granted no one had done it in the heat we have here. after the shrouding and that on the cooler, im actually happy with how its doing. why its getting hotter than it should i believe is another issue like the leaky intercooler.
gears will come one day soon. not somehting i really wanna do in the summer here lol
Gotcha...also my bad as I just noticed you have a LB7...thought you had an LLY so I went into my standard OH speal. I've heard the LB7 does not have the OH issue like the LLY so you're probably right it is something else completely. I don't have a true tow tune but i've heard that with one you can get significant pulling power increase with much lower egts over performance tunes. I'm stuck with the Banks until I blew a turbo or tranny then I'm going EFI and will look for a solid tow tune. I have the Banks intercooler and with my LLY, while it did help across the board, it didn't really have any significant impact on hot ECT and EOTs...but mine is an LLY.
Lol all good man. yes a true tow tune would probably help me as now that i think about it, those upper rpm's are not optimized in timing. gunna have to play with that as im sure it would help some. just never noticed it to be an issue till this heat came on. For the intercooler not helping, ive heard mixed reveiws about a leaky one causing higher oil temps due to the intercooler making the turbos work much more than they should, this then adds up on top of everything else for heat. While your an LLY, never hurts to throw out ideas. yours can benifit a little more as well in the turbo area cause you can adjust veins and what not to help with EGTs as well. i cant, hence the big brother the stock turbo got
I experienced a noticeable difference with my ECTs when I installed the Mike L tranny cooler...it still got too hot for my liking and I had to do more but I could tell the two have serious causal relationship...they really help heat each other exponentially when they get hot. I recently added the BD extruded tranny cooler with fan and I am amazed at how well it keeps the tranny cool...in the most extreme conditions I never go over 191 whereas I used to hit 230+ in the same conditions. But the new BD cooler did not have the same impact on ECTs as the addition of the Mike L. So I'm guessing the Mike L cooler hits the sweet spot of the cooling curve.
hence the big brother the stock turbo got
sure...rub it in! i want duals!!! guess i need to grow a pair. (pun intended) i live in ca, freakin nanny state, but my truck maybe relocating to a smog exempt county so duals may be in my future!!!!!
James, what are you using to monitor coolant temps? If you are using the factory gauge, I would suggest using your V2 or something else that monitors actual temp. The gauge has a bit of a dead band so there isn't a lot of movement in the gauge. I don't think your EGTs are causing your high oil temps. I'm sure they aren't helping, but I think it's just hot outside. When you work the truck hard when it is hot, everything will get hot. I would have thought the oil cooler would have kept it more reasonable, but you aren't helping anything with the big tires and the lift. From what I've seen, the oil temps are directly tied to the coolant temp. If my oil temp goes up, so does my coolant temp. I'm not sure if coolant temps are increasing the oil temp or vice versa, but I think if you can keep your coolant temps in check, your oil temp will probably drop some too.
if you happen to get out to hell paso there are 2 junk yards that have about 20 4:10 models between them. let me know If I can help you with that.
so here is a suggestion that I have not seen offered, are you sure that you have not spun the impeller off the shaft in/on the water pump?
i have monitored it before and yes, the gauge is definitly less than quick to react to the actual coolant temp. i have to say though, i could only give numbers based on the temp on the dash. i need to set my v2 up for black box logging and ill have it log on my next trip. using a laptop is a biotch. I had brian watch my coolant temps when were cruising back from ABQ on my laptop and at 195 on the gauge, EFI live read 196-197. never got it hooked back up in time for the big hills though.
i agree the oil temp and coolant temp are directly tied. IMHO, oil temps are driving the coolant temp up more so than the otherway around cause my oil temp is always higher than the coolant temp when towing.
i expected more from the cooler too BUT i think there is something else hindering me thats causing this issue cause prior to the cooler in cooler outside air temps, it didnt take much power at all to get oil temps to climb to 255 in a hurry.
oh no kiddin! if i dont find somethign up here for a decent price, i may jsut have to head down there!
well id think id be seeing some extremely high coolant temps around town if that were so. if im cruising on the freeway unloaded, truck will never get over 190. plus my shifts are at 3200 rpm and i have a welded impeller on the water pump
I have a front and rear set of 4:10's with just only 9k on them. wrecked pickup. I would have to have a set of running gear in return though as I would like to use this frame and running gear for my project this winter. locking diff too. 2500HD 6.0.
If its a 6.0, the rear end is the 10.5 ring gear and not the 11.5 that only comes in the big block/dmax trucks. thats for 01-07 though, i dont know if they put the 11.5s under the new body style trucks with the 6.0. farely certain they didnt though
As far as I know all SRW 3500 trucks had the 11.5. Irregardless of motor. Might broaden your search for 4:10's a little.
This won't help your temp issue but I would change my oil sooner if I were you. I change mine more often when I pull. I have also noticed since I have the twins my egt's are better but I run a tad warmer on the coolant under a load, not much but im assuming thats because of the oil feeding two turbos and just more heat from the big turbo.
