What turbo for a LQ4 Tow Rig??
10-03-2013, 08:09 AM
#23
with a tow rig I'd want it to be making a couple pounds of boost at 2500rpm at part throttle. I would want it to peak early in the rpm range, this way you don't need the engine rpm's high to make any decent power.
Diesels tow so well because they make power early and then carry it through their rpm range. Everyone on the internet throws on huge turbo's and they make great peak numbers, which is great for drag racing, but really isn't good on the street. A smaller turbo will peak early and that is what you want in my opinion.
10-03-2013, 08:25 AM
#24
Actually no,about 50-60% throttle. Amazing what the right cam and turbo set up can do huh? This is also with 2.5" tubes leading into the turbo. I imagine with 2" schedule 10 pipes it might pick up a couple rpms. On a 6.0 I would expect positive pressure even lower. A s475 with the 96mm turbine would be my choice. Ialso have a deisel tow rig too. It is all stock though.
10-03-2013, 08:39 AM
#25
Problem is building boost at a low enough rpm with that turbine. I've used just about every box stock BW there is, and that turbine has never really had much to offer down low under 2000rpm. What that t70 can do in OD, the s475 will need to be in 3rd.
10-03-2013, 09:24 AM
#27
6BT diesel Cummins swap and never look back. You can get 20-22mpg highway empty and 13-4mpg towing 10,000lbs close flat front trailer.... and 16-17mpg towing an open trailer. Drag and speed/RPMs is more relevant to weight with diesel fuel economy. 600ft/lbs essentially stock.
You may as well just buy the entire Dodge truck running. I have had a few of them and best tow rig ever. They just don't ride as nice as Duramax trucks.
You may as well just buy the entire Dodge truck running. I have had a few of them and best tow rig ever. They just don't ride as nice as Duramax trucks.
10-03-2013, 09:44 AM
#30
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6BT diesel Cummins swap and never look back. You can get 20-22mpg highway empty and 13-4mpg towing 10,000lbs close flat front trailer.... and 16-17mpg towing an open trailer. Drag and speed/RPMs is more relevant to weight with diesel fuel economy. 600ft/lbs essentially stock.
You may as well just buy the entire Dodge truck running. I have had a few of them and best tow rig ever. They just don't ride as nice as Duramax trucks.
You may as well just buy the entire Dodge truck running. I have had a few of them and best tow rig ever. They just don't ride as nice as Duramax trucks.
10-03-2013, 10:37 AM
#32
'93-02 Ram 2500 or 3500 are the best bang for the buck.
There are tons of them for sale.
2WD trucks do horribly off road as most of them have open rear ends
they have ok turning radius
4WD trucks need the front ends rebuilt due to the 1000lbs weight of the 6BT
these trucks have a worse turning radius and weigh probably 1,000lb more with the huge Dana60 up front.
That being said I have a 2WD 2001 Dodge Ram 2500 extra cab long bed and love it.
13mpg towing a 10,000lb enclosed flat front trailer at 65mph
10mpg going 75mph with same trailer
17-18mpg towing an open loaded car trailer (5-6K pounds) at 65mph
18-19mpg towing empty open car trailer at (2K pound) at 65mph
20-22mpg all highway empty and no trailer at 65-70mph
stock turbo/intercooler/Edge Juice tuner (on lowest setting to save trans)
Trans is stock with 130K miles with upgraded line pressure solenoid kit.
Stock tq convertor is the weak link and can only handle so much tq or I would have turned up the Edge Juice tuner higher.
Tire width affects mpg. Stick with stock size unless you gotta look cool
I bought mine off the original owner with heated leather seats, perfect silver paint, 92K miles for $10K. I'm going to sell it 3 years later with 40K miles more for $11K easily. I have only replaced the injector pump and new tires in that time. Take your time to find a good one. They are out there.
There are tons of them for sale.
2WD trucks do horribly off road as most of them have open rear ends
they have ok turning radius
4WD trucks need the front ends rebuilt due to the 1000lbs weight of the 6BT
these trucks have a worse turning radius and weigh probably 1,000lb more with the huge Dana60 up front.
That being said I have a 2WD 2001 Dodge Ram 2500 extra cab long bed and love it.
13mpg towing a 10,000lb enclosed flat front trailer at 65mph
10mpg going 75mph with same trailer
17-18mpg towing an open loaded car trailer (5-6K pounds) at 65mph
18-19mpg towing empty open car trailer at (2K pound) at 65mph
20-22mpg all highway empty and no trailer at 65-70mph
stock turbo/intercooler/Edge Juice tuner (on lowest setting to save trans)
Trans is stock with 130K miles with upgraded line pressure solenoid kit.
Stock tq convertor is the weak link and can only handle so much tq or I would have turned up the Edge Juice tuner higher.
Tire width affects mpg. Stick with stock size unless you gotta look cool
I bought mine off the original owner with heated leather seats, perfect silver paint, 92K miles for $10K. I'm going to sell it 3 years later with 40K miles more for $11K easily. I have only replaced the injector pump and new tires in that time. Take your time to find a good one. They are out there.
10-03-2013, 11:15 AM
#34
If you want to take hills in 2nd gear lol. But whats the point of a turbo then? If you actually want to build a turbo setup for towing, it should be the turbo making the torque. Not gearing. There's a reason diesels have tiny exhaust wheels/housings...
10-03-2013, 02:23 PM
#36
There seems to be some ambiguity as to what 'load' means when applied to a turbocharger. Turbo load is a function of cylinder air mass and RPM, neglecting the smaller contributions. Load by definition is a demand for something (electric current, water volume, heat transfer, etc) due to a difference in energy potential (voltage, pressure, heat difference, etc). The demand of the turbo is to increase shaft speed and the potential is pressure delta on the turbine. As soon as you mash the throttle and start dumping fuel in, the coefficient for the air mass part of the turbo's load is maxed. The reason the turbo continues to increase shaft speed is due to engine RPM driving the exhaust flow at an increasing rate.
Not to be an ******* or anything, but saying that one gear loads a turbocharger better than another is incorrect. There is a difference in turbo airflow capability between gears, but it is not load; it is called entropic heating, which is determined by the compressor wheel and airflow transient response. But that is another topic entirely.
With that said, load on the turbo will be smaller at a lower engine RPM. For a turbine/housing that is large, the same amount of load will drive the shaft at a lower RPM than with a smaller turbine/housing. This results in lower boost at lower engine RPM. If someone honestly wants to use the turbo to aid with towing, it is best having the boost come in as soon as possible. I probably can't speak for everyone, but I prefer not to rev to 4k or higher just to make enough torque to accelerate with a trailer. For that to be possible, a smaller turbo is in order.
For reference, the box stock s475 with the 1.32AR turbine housing has turbine dimensions of 96mm inducer, 88mm exducer. The HX35 turbo that comes stock on countless 5.9L cummins trucks has a turbine with a 69.5mm inducer, 60mm exducer. It is smaller in every dimension.
Not to be an ******* or anything, but saying that one gear loads a turbocharger better than another is incorrect. There is a difference in turbo airflow capability between gears, but it is not load; it is called entropic heating, which is determined by the compressor wheel and airflow transient response. But that is another topic entirely.
With that said, load on the turbo will be smaller at a lower engine RPM. For a turbine/housing that is large, the same amount of load will drive the shaft at a lower RPM than with a smaller turbine/housing. This results in lower boost at lower engine RPM. If someone honestly wants to use the turbo to aid with towing, it is best having the boost come in as soon as possible. I probably can't speak for everyone, but I prefer not to rev to 4k or higher just to make enough torque to accelerate with a trailer. For that to be possible, a smaller turbo is in order.
For reference, the box stock s475 with the 1.32AR turbine housing has turbine dimensions of 96mm inducer, 88mm exducer. The HX35 turbo that comes stock on countless 5.9L cummins trucks has a turbine with a 69.5mm inducer, 60mm exducer. It is smaller in every dimension.
10-03-2013, 02:43 PM
#37
I had a turbo on my Avalanche which I used to pull my race car,5-6k lbs. Heat was an issue and KR would build if boosted too long. Always watching the coolant temp and vacuum gauge making sure I wasn't boosting too long. I wouldn't recommend turboing your setup to pull a 5th wheel.
10-03-2013, 02:52 PM
#38
https://ls1tech.com/forums/generatio...-too-cool.html
Anyway, I'm sure there are other ebay rads out there that would do the jog. All aluminum and significantly thicker, minor trimming on the shroud.
Last edited by AnotherWs6; 10-03-2013 at 03:50 PM.
10-03-2013, 03:06 PM
#39
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