Towing with a OBS
Posting Guru
Joined: Jun 2011
Posts: 1,083
Likes: 0
From: Walla Walla, WA
my 60 tow tune seems almost like the stock tune. i ran the 80 the whole time, because it was running good. its hard to tell with the 1.0 housing, because when i changed it i did my IC and t500 at the same time and i didnt tow anything really heavy before then. it spools up faster than the stock i know that. sorry i couldnt be more help on the 1.0 housing ? i picked mine up for about $100 bucks. it might be something worth trying.
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Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
Well this AM, I pressure tested my I/C and tubes as a unit. Found a small leak where the Driver tube met the I/C. I repositioned the clamp and retightened. Also found a pin hole in one of the welds. For a temporary fix I just slip an old boot over the pin hole and clamped it. but like I said, I saw No difference in boost pressures with out without the I/C so both leaks must have been minute.
I also bypassed the boost cooler. Going to go for a quick ride once the truck warms up and see what it does
I also bypassed the boost cooler. Going to go for a quick ride once the truck warms up and see what it does
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Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
Unless I am mistaken, OBS have a 1.15 housing
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
Correct.
So your having trouble holding to the speed limit in the 60T tune with stock ABs. Is power in that tune the problem or are EGTs holding you back?
If you need more power, but EGTs get wild when you run a little bit more powerful tune... I would suggest a better turbo setup and run a hotter tune. I'd keep an eye on ICP running the hotter tune since split shots love oil so much, but you're probably fine on that. I run 160/100s with an S465 and tow 12000lbs in OD at 1900 RPMs through hills without any EGT issues in my street race tune. Not heavy by any means, but I'm running a pretty powerful tune. I can run flat out in my tow tunes and usually max out at 1200-1250* EGTs.
So your having trouble holding to the speed limit in the 60T tune with stock ABs. Is power in that tune the problem or are EGTs holding you back?
If you need more power, but EGTs get wild when you run a little bit more powerful tune... I would suggest a better turbo setup and run a hotter tune. I'd keep an eye on ICP running the hotter tune since split shots love oil so much, but you're probably fine on that. I run 160/100s with an S465 and tow 12000lbs in OD at 1900 RPMs through hills without any EGT issues in my street race tune. Not heavy by any means, but I'm running a pretty powerful tune. I can run flat out in my tow tunes and usually max out at 1200-1250* EGTs.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
He sees more than double that in his higher tunes.
It is possible that the plenums could be leaking boost too, but if it's building 35psi in the hot tune, I doubt it's leaking much..
It is possible that the plenums could be leaking boost too, but if it's building 35psi in the hot tune, I doubt it's leaking much..
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Posting Guru
Joined: Aug 2004
Posts: 2,417
Likes: 4
From: Braham MN
Sounds to me like a bad tune....I would try a different chip if possible. you know the truck is capable of making 35 PSI but 15 in a tow setting IMMEDIATLY says to me bad tuning. Split shots should blow right past 15 PSI pulling 20K.
FWIW I have pulled 15K with my crew cab and 3:55's and 70 MPH was no problem in the central MN hills.
Diesel Rod
FWIW I have pulled 15K with my crew cab and 3:55's and 70 MPH was no problem in the central MN hills.
Diesel Rod
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
I'm starting to think its his tunes. He should make around 20psi with out his chip. So to me that says his tuner has him tuned way back.
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Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
I can hit 22-23psi in the stock tune and 60hp tow tune but that is running it right up to 3,300rpm in 3rd . Thata is the ONLY gear and RPM I can see anything over 15psi.
I was thinking the chip was at fault too
The EGTs are in check in the stock or 60hp tow tune(1,200*). I almost feel no difference between the 2 tunes. I can hear the timing change when I switch, but no real power increase
I was thinking the chip was at fault too
The EGTs are in check in the stock or 60hp tow tune(1,200*). I almost feel no difference between the 2 tunes. I can hear the timing change when I switch, but no real power increase
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
It would be interesting to run a full tank on each tune. If the power is about the same, but the timing is different, you gotta wonder if the fuel economy would be different between the two.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
I can hit 22-23psi in the stock tune and 60hp tow tune but that is running it right up to 3,300rpm in 3rd . Thata is the ONLY gear and RPM I can see anything over 15psi.
I was thinking the chip was at fault too
The EGTs are in check in the stock or 60hp tow tune(1,200*). I almost feel no difference between the 2 tunes. I can hear the timing change when I switch, but no real power increase
I was thinking the chip was at fault too
The EGTs are in check in the stock or 60hp tow tune(1,200*). I almost feel no difference between the 2 tunes. I can hear the timing change when I switch, but no real power increase
Being able to pull 20k+ up decent grades takes some pretty good power and trying to run those power levels makes it tough to keep EGTs down.. Especially since the stock turbo will be making so much hot air at those power levels.
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Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
Tried that. Not real difference in Fuel economy 7 - 7.2.
It seems like the power is down ever since I tore the truck down last summer to redo it
You could definitely try some different tunes if you're not feeling any difference in those tunes.. Personally, I'd try a better, little more powerful tune. If EGTs get too hot, look for leaks, check ICP, etc, etc. to make sure there are no issues with the truck. If the truck checks out, look into a better charger to keep EGTs down so you can run more power to pull those loads... Or even water injection..
Being able to pull 20k+ up decent grades takes some pretty good power and trying to run those power levels makes it tough to keep EGTs down.. Especially since the stock turbo will be making so much hot air at those power levels.
Being able to pull 20k+ up decent grades takes some pretty good power and trying to run those power levels makes it tough to keep EGTs down.. Especially since the stock turbo will be making so much hot air at those power levels.
I was thinking different tunes as well, only because I think something happended to the chip
More Turbo
Joined: Sep 2002
Posts: 515
Likes: 1
From: Windsor, CO
Just got back from a 2300mi trip on Monday night. Towing this:
Trailer alone is around 5K. Rigs weigh in at 4500lbs and 5000lbs(with gear). Then add in my 100 gallon transfer tank, 4 kids and two 240lb adults. We were roughly around 24,000lbs.
Truck is a 94.5 PSD with a 5spd and stage 1 mods. Never dropped under 4th gear where I needed to pulling from Fort Collins, CO to Truckee, CA and back.
I run a PHP Hydra chip in the 65hp heavy tow tune. EGTs are in check with a e99 spyder, 7.3L intercooler, self built pipes, etc. T-500 HPOP. I can hit 20psi pretty easily on pulls, but EGTs will start to get up there.
FWIW, everything I have read say 1300* is what you need to keep it under.
On a side note, this is my current "camping package". Its also around 24K.
Trailer alone is around 5K. Rigs weigh in at 4500lbs and 5000lbs(with gear). Then add in my 100 gallon transfer tank, 4 kids and two 240lb adults. We were roughly around 24,000lbs.
Truck is a 94.5 PSD with a 5spd and stage 1 mods. Never dropped under 4th gear where I needed to pulling from Fort Collins, CO to Truckee, CA and back.
I run a PHP Hydra chip in the 65hp heavy tow tune. EGTs are in check with a e99 spyder, 7.3L intercooler, self built pipes, etc. T-500 HPOP. I can hit 20psi pretty easily on pulls, but EGTs will start to get up there.
FWIW, everything I have read say 1300* is what you need to keep it under.
On a side note, this is my current "camping package". Its also around 24K.