oh i got ya. yeah i just cant see it helping my EGT issue though
lol im willing to try it!
Your thoughts
- Thread starter Chevy1925
- Start date
oh i got ya. yeah i just cant see it helping my EGT issue though
lol im willing to try it!
I don't have an oil temp gauge but last weekend towing 10-11klb camper at anywhere from 75 in 5th to 85 in 6th (stock gears on 305/50r20) up grades the water temps would run up to 210-220, the fan would kick in and drop right back to around 200-205 going up hills. Don't know what the grades are, nothing too steep but some are long and steady. Outside temps were around 100degF
I am running the thermostats from Pat/Kat which keep temps around 170deg for normal daily driving, works perfect for me in that application. Obviously the system cooling capacity is being taxed heavily with the increase in oil temps from the twins.
One thing about the twins is 6th gear at 85 and you can just roll into the throttle and accelerate up the grades with ease! Very impressive towing when you keep the rpm's at that 2000rpm+ point. They light good around 1800rpm.
EGT's up a good grade and maintaining speed are 1150-1200 in 5th around 70-75mph and 1300 in 6th around 85mph.
This was all on tune 2, i'm guessing around 480-500hp but Josh would know better than I would on that. I just drive it!
I'll be heading to Colorado Saturday with a little 16' and the RZR to go ride in the mountains. Really curious to see how the twins do with the altitude change.
I am running the thermostats from Pat/Kat which keep temps around 170deg for normal daily driving, works perfect for me in that application. Obviously the system cooling capacity is being taxed heavily with the increase in oil temps from the twins.
One thing about the twins is 6th gear at 85 and you can just roll into the throttle and accelerate up the grades with ease! Very impressive towing when you keep the rpm's at that 2000rpm+ point. They light good around 1800rpm.
EGT's up a good grade and maintaining speed are 1150-1200 in 5th around 70-75mph and 1300 in 6th around 85mph.
This was all on tune 2, i'm guessing around 480-500hp but Josh would know better than I would on that. I just drive it!
I'll be heading to Colorado Saturday with a little 16' and the RZR to go ride in the mountains. Really curious to see how the twins do with the altitude change.
one thing about oil temp ive found a trend in is oil temp vs water temp. oil temp will climb to 255* with coolant temp holding steady at 195. as soon as oil temp climbs above 255, water temp will then start to climb as well. in my truck, you can see it happen every time. also, as soon as oil temp hits 210 or less, water temp will quickly fall to 170-180 and hold. i also noticed every time my oil temp hit 225*, my fan would come on like clock work and stay on till oil temp dropped to 220*.
i was watching the shit out of my gauges lol
i was watching the shit out of my gauges lol
I need to install a oil temp gauge, ive towed 15k on the flats and water got to 225 so im sure the oil temps were up there. 100 degrees outside and egts were 900-1300 depending on small inclines at 65mph on 285s.
Dang!! 255+ oil temps just makes me cringe thinking about it!! Maybe I should back off the throttle a little, starting to make me feel guilty because I had to be up there.
lol yeah, without that oil temp gauge, its funny how high it gets before coolant temp is affect. if your running full synthetic, you will be fine but im running reg oil to finish getting these rings to seat. next oil change im switching back to full syn to keep it safe when towing in the heat.
What kind of oil are you using and how long since it has been changed? Is your stack good and clean?
The only thing performance wise I focus on with my truck is towing big so while I'm not an expert mechanic by any means, I've spent ungodly amounts of time reading, adding, testing, tweaking, testing, stand on the side of the road to let the truck cool, throw tantrum, adding/tweaking, testing, reading, rinse and repeat. Towing big =
- more than 10k trailer
- above 4k elevation
- 5+% grades
- lots of wind drag
- outside ambient temps above 90
What I've found is that the OAT has the most significant impact on the ECT and EOT. And I can say with no doubt/hesitation that the only fix is an auxiliary radiator...and the only proven solution still in existance is the Engineer837 DIY aux cooler. DP has ungodly amounts of data on the OH topic.
My most recent climbs pulling 16k were in OAT 108-114, in 4k+ elevation, up 6%+ grades and with all my cooling mods I hit 240 coolant temps, 285 oil temps, and 191 tranny (I have the Mike L cooler and the BD remote cooler with fan). Same run in 85 OAT, coolant maxes at 215, oil at 255 and tranny 191. When pulling over 90 degrees, the whole world changes and it takes a lot to keep the LLY dmax cool when towing big.
Also to my knowledge the DMAX is rated for 1350 EGTs constant duty. I spend a lot of time in the 1300s and have even run it for spells in the 1400+ range (had a boost leak).
- more than 10k trailer
- above 4k elevation
- 5+% grades
- lots of wind drag
- outside ambient temps above 90
What I've found is that the OAT has the most significant impact on the ECT and EOT. And I can say with no doubt/hesitation that the only fix is an auxiliary radiator...and the only proven solution still in existance is the Engineer837 DIY aux cooler. DP has ungodly amounts of data on the OH topic.
My most recent climbs pulling 16k were in OAT 108-114, in 4k+ elevation, up 6%+ grades and with all my cooling mods I hit 240 coolant temps, 285 oil temps, and 191 tranny (I have the Mike L cooler and the BD remote cooler with fan). Same run in 85 OAT, coolant maxes at 215, oil at 255 and tranny 191. When pulling over 90 degrees, the whole world changes and it takes a lot to keep the LLY dmax cool when towing big.
Also to my knowledge the DMAX is rated for 1350 EGTs constant duty. I spend a lot of time in the 1300s and have even run it for spells in the 1400+ range (had a boost leak).
I run whatever is on sale... Rotella, Delvac, or Delo and change it every 3-5K miles with Wix filters.
Maybe i'm still in the break in period?? lol
Maybe i'm still in the break in period?? lol
Funny you say that im not to far right now on vacation, Im at Lake City .:thumb:
Spray methanol into your oil to help cool it down
lol i was talkin with andrew, steve, and brian about that last night. im against things you have to "refill", mainly cause im lazy and i dont feel the need to have to spend money on that stuff if i dont have to to band aid an issue
had 100 miles on this oil change running delo 400 reg 15w40. when i towed brians truck, i was on an oil change with 3500 miles on it already. Cooling stack was not 100% spick and span when i pulled the intercooler to have it welded but there was nothing in there i would deem to be an issue. i did a quick pressure wish prior to putting the intercooler back in so it shouldnt be an issue.
my issue is, this is the first ive had the truck do this. my dad used this truck for pulling our 40 ft weekend worrier fiberglass siding for years prior to me owning it. never once did he have overheating issues when we would tow up to flagstaff but again, that was with an edge tuner on lvl 2 only with nothing else done.
IMHO, there is something else going on im missing and it may be a combo of things, not just one.
the plan so far is to pick up a new intercooler, thoroughly clean the cooling stack when its apart, change thermostats back to GM ones (i bought napa ones and i jsut dont trust them), try a tuning change, check the living hell out of the truck for boost leaks or exhaust leaks, and play with my stock turbo gate some to see if bringing the big turbo on sooner or later has any affect.
i really think the intercooler is the big one.
i agree. i can watch it happen. upping the engine rpm makes the engine oil jump in heat much quicker too (obviously)
I don't think your 37's are causing as much problems as some say cause you can just downshift and be fine.
The LMM used to be able to tow 10,000 lbs up the grapevine at 75mph in 6th gear 1750 rpm with 1200* EGT's. It's got to be that damn batmowheel because I have to do it in 4th at 2000 Rpms to hold 1200 EGT's