04.5 turbo for towing

[Sixpac2]

We are full time rv'ers towing a large fifth wheel. Truck has 106,000 miles now.

The last haul from Vegas to Death Valley to Yosemite was the steepest and longest hills I have ever drove.

That said. Been rereading TDR magazines and am looking at a turbo update for a stock truck except smarty. With smarty on sw1 egts never are a problem.



I can not seem to find the specs on the 351 holset other than 9cm outlet. From tdr magazines it seems that this is to small and larger would help on mileage as well.

When you look at BD, ATS, Chettah, and others they do not have much specs listed either.



So what is the specs on our stock turbo. Turbine, compresser.



What would be the top 2 turbos for TOWING.

 

[Newt]

The top 2 turbo's for towing is 2 turbo's.

Newt

 

[Hawk]

Industrial Injection Silver series 62/80 or the Garrett GT3782R. I personally pick the Garrett but the rebuild will be more expensive. You can rebuild the II for like 120 bucks at the house and the Garrett will need to be sent in.

 

[cerberusiam]

Truthfully, if you are running nothing more than Smarty on SW1 and your EGT's ar ein check, you have the best all around turbo. Put a boost fooler on it for some better top end air and drive it. Until you are consistently pushing over 35 psi there is really no compelling reason to spend the $$ unless you really want to.



The Garret BB that AH64D installed would be my choice for a towing turbo if so inclined. An SPS 62\12 for more performance and still tow.



The HE351 specs are not that bad a slong as they are used in their range. DP is the biggets problem at higher rpms but thats relatively easy to drive around.





HE351:



4" compressor inlet 2. 75" outlet.



Standard T3 turbine inlet flange



4" Vband Exhaust outlet



Compressor Wheel:

Inducer: 60mm/2. 36"

Exducer: 84. 5mm/3. 33"



Turbine Wheel:

Inducer: 65mm/2. 56"

Exducer: 58mm/2. 28"



Turbine Housing:

Single Scroll 9cm (~. 65A/R)



(Note: all the info indicates the smaller housing will flow comparable with an HX 12cm housing to a point)

 

[AH64ID]

EDIT: Looks like I am a little slower this morning, time for some more coffee... .


I love my Garrett GT3782R. It works very well with the Smarty for towing at the 350-400 rwhp range.

The stock turbo is a 60/60/9.

Comp wheel is a 60x85mm wheel, turbine is a 68x60mm wheel, and the turbine is a 9cm equivalent, with an undivided housing. It's supposed to flow like the divided HX 12cm turbine, but looking at DP I am not convinced.

The comp wheel on the OEM turbo is a good unit and can supply the air that you would need, but the turbine cannot move it out fast enough and runs a lot of back pressure (intentional for emissions). Empty cruise was a 1. 3-1. 5:1 on my HE351, and pulling grades at a 25-30 psi was 1. 5-2. 0:1 range.

The GT3782R move only a little more compressor air, but does it more efficiently (read cooler intake temps). The turbine unit is great. It's a . 89 AR exhaust housing (similar to a 16-18 cm housing), so it's very free flowing but spool isn't effected due to the BB center and properly matched turbine/compressor.

My cruise boost is down, mileage is up, and drive pressure only goes above boost on empty WOT run above 2500 rpms. On a WOT towing run in 5th up a grade it stays at 1:1.

Here is a link to my install and write-up, which I need to update since I am running Smarty UDC now. But the short story is ~400-415 rwhp, WOT up a 6% grade in 5th I haven't broken 1250° yet from 2200 to 2700 rpms. In 6th at 1700-1800 rpms I have pulled short (not long ones, as I drop to 5th for those. Just curious at temps/etc at lower rpms) 6-7% grades at 96-98% throttle and not break 1250°, even at 18,600 lbs.

https://www.turbodieselregister.com...age-2-gt3782r-install-review.html#post2216032

 

[Joseph Donnelly]

The wheel sizes are only one indicator of air flow capabilities. I like the BD Super B and the Killer B, the latter if more fueling modifications are done. both flow a lot more air than the stock turbo. The Super B spools fast, similar to stock. Be sure to order a turbo that will directly bolt in so you don't lose your exhaust brake. The Smarty has a built-in boost fooler, which you will need, and BD can supply a connector to cap off the wiring harness for the wastegate controller.

 

[Sixpac2]

What does inducer and exducer mean in the previous post.
There is a number for both wheels?

 

[AH64ID]

The inducer is the diameter of where the air enters the wheel, the exducer is the diameter of the where the air exits the wheel.

The BD super B is very simliar in flow to the HE351, 806 CFM vs 850. Its a good turbo, but all you are really upgrading is the turbine. The turbine is the choke point, but when I was turbo shopping I didn't consider the super B a cost effective upgrade for the 04. 5-07.

 

[rscurtis]

It was a great upgrade for my signature truck, which uses stock fueling (no "Magic Black Boxes"). Use their manifold, too.

 

[AH64ID]

It was a great upgrade for my signature truck, which uses stock fueling (no "Magic Black Boxes"). Use their manifold, too.

That makes sense, the HE341 flows a couple hundred CFM less than the HE351.



I did some browsing on BDs site today and see they have the single at 870 CFM. I will have to check my notes at work, but IIRC they only reported lb/min last time I looked.