Garrett Powermax Stage 2 GT3782R Install/Review

[AH64ID]

Good to know! 950° post is just about too hot for my liking when towing! Really hard to know if its a 300° or 400° drop across the turbo.

 

[AH64ID]

I did a 670 mile trip this weekend where 640 miles were towing my TT. I am guessing about 16. 5K on the trip down and 16K on the trip back. With my extended shank my TT is not windage friendly, and on the flats takes as much power to maintain 60 as the 15K lb dump trailers I have towed. For the most part cruise was set at 70-71. Elevation ranged from 2800 to 7000. There were a couple of short 9% grades, but mainly in the 5-6% range when pulling hills. Temps were 70-97°.

Boost ran from 5 psi on the flats to 30 psi on some of the long grades (drive never went over 25 that I saw). EGT's were from 800-1100° except on the longer grades. EGT's didn't break 1200° except the one grade that went to 7000 feet. They peaked about 1300° at 71 mph which was 2100ish rpms. I am not sure I can complain about that, 7000 feet at 70-75° ambient is not EGT friendly when pulling 5-6% grades in 6th, which took up to 92% load on a 400 rwhp tune.

I was harder on the truck that I have been on that trip in past years (weight and speed) and got better mileage on the trip down than I have ever gotten and roughly the same on the way home, but drove a good 5-10 mph faster on average.

 

[ENafziger]

and got better mileage on the trip down than I have ever gotten

What was your mileage?

 

[AH64ID]

I averaged 11. 45 for the trip, with a high of 12. 49 and a low of 10. 73. The 10. 73 was the out and back from Wells, NV with 3 passes each way in a 161 miles.

 

[ENafziger]

I averaged 11. 45 for the trip, with a high of 12. 49 and a low of 10. 73. The 10. 73 was the out and back from Wells, NV with 3 passes each way in a 161 miles. <!-- google_ad_section_end -->

I'd say that's pretty good. I averaged 9. 5 mpg on our trip to Alaska grossing ~ 20,500 lbs give or take, pulling a 34' TT, loaded down etc. Of course, this included 500 miles of 4x4, elevation beyond 10,000 ft, temps between 38 and 103.

--Eric

 

[AH64ID]

Yeah I can't complain, I wasn't being as nice to it as I normally am and the mileage wasn't all the much worse than normal.

 

[NIsaacs]

Sounds like a good trip, with the truck performing very good, good milage too for a wind resistant load. What "Jake" do you have? I never figured elevation made much difference in boost or egt's until you were in the 10,000 ft. range but I don't get "exact" numbers so I might be wrong.



I hauled a load of scrap to Phoenix from Showlow, via Saltriver Canyon Saturday 20,100 lbs gcw. I hauled at night so I drove slow (lotsa Elk) so I stayed in 5th almost to Globe before I went the speed limit (65) and 6th.



With about 40 miles on the tank of fuel empty pickup, 180 miles loaded and 30 miles empty trailer I averaged 14. 45 mpg. Down Salt river it took 10 minutes in 4th with exhaust brake on all the way, no brakes and 10 minutes up the other side, also in 4th.



Nick

 

[AH64ID]

I rarely get below 2700 feet with my truck, but towed from Montana to Seattle a few months ago, as the passes go lower so did the EGT's, and my EGT's were crazy low at sea level. I didn't realize how much of a difference it made. But its just like a turbine enigne, altitude makes a huge difference in EGT's, but full power isn't effected until you get quite high.

I am running the elbow mounted OEM Jake.

 

[DRyder]

AH64ID, thanks for the write up! Will I need a cam upgrade like in your signature or will a smarty handle the turbo's needs?

Dave

 

[AH64ID]

The Smarty should do it. A cam doesn't hurt, but on the 03-04's with the better pistons it shouldn't be an issue.

 

[Tinman]

Doesn't the 03-04s have the best stock cam grind? With the good pistons and no 3rd injection event, a good turbo and a smarty and your ready to rock.

 

[Gonzo 1066]

I rarely get below 2700 feet with my truck, but towed from Montana to Seattle a few months ago, as the passes go lower so did the EGT's, and my EGT's were crazy low at sea level. I didn't realize how much of a difference it made. But its just like a turbine engine, altitude makes a huge difference in EGT's, but full power isn't effected until you get quite high.



I am running the elbow mounted OEM Jake.

The extra humidity actually makes MUCH more difference in EGT's than the elevation does. I find this every time I come home from the southwest. The extra water in the air makes the air easier for the charger to bite and this also results in a few pounds more manifold pressure.

I see the same thing in my diesel pulling tractors, the more water-alky I spray into the intake the more manifold pressure-the more power=less EGTs

 

[AH64ID]

Doesn't the 03-04s have the best stock cam grind? With the good pistons and no 3rd injection event, a good turbo and a smarty and your ready to rock.

From all the research I have done all HPCR 5. 9's use the same cam grind, but the 03-04's do have a much better piston design.

The extra humidity actually makes MUCH more difference in EGT's than the elevation does. I find this every time I come home from the southwest. The extra water in the air makes the air easier for the charger to bite and this also results in a few pounds more manifold pressure.

I see the same thing in my diesel pulling tractors, the more water-alky I spray into the intake the more manifold pressure-the more power=less EGTs

I have always thought that humidity would make a big difference but have never noticed it. Pulling the same load on the same hill on a high humidity day vs a low one the EGT's are very close given the same OAT... thou I don't get many high humidity days around here.

 

[TCDiesel]

All 03s and Early 04s have same cam. Late 04 have the same cam as 04. 5. They No longer make the early grind. . ug

 

[AH64ID]

All 03s and Early 04s have same cam. Late 04 have the same cam as 04. 5. They No longer make the early grind. . ug

Have you visually verified and measured a difference?



I have talked to a couple of the bigger cam builders for our engines, and several engine builders, and every one of them said the 03-07 all use the same cam, contrary to popular belief. The cam profile wasn't as hard on performance with the 03-04 piston style, but with the 04. 5-07 piston design it made a huge difference.

 

[TCDiesel]

Have you visually verified and measured a difference?



I have talked to a couple of the bigger cam builders for our engines, and several engine builders, and every one of them said the 03-07 all use the same cam, contrary to popular belief. The cam profile wasn't as hard on performance with the 03-04 piston style, but with the 04. 5-07 piston design it made a huge difference.

Yes... ... ..... Even the Part # were different into 05. . I don't rely on whats popular or typed. . (Although MY Bank Account has seen huge increase form the net and the worlds wisdom)

 

[AH64ID]

Yes... ... ..... Even the Part # were different into 05. . I don't rely on whats popular or typed. . (Although MY Bank Account has seen huge increase form the net and the worlds wisdom)

Interesting, your the first one I have talked to that has had hands on them and says they are different. Any spec's on them, or other proof... I have no reason to not trust you, or the other people for that matter.

 

[TCDiesel]

Yep... Most will take the wide road BC its the flow to popular believe... Go check on Comp. . Back a couple of years ago 1 member posted pictures form his 03 and late 04 2 different cams. . both motors were 305... Wow its hard to believe its been 8 years for CR . . it seems like yesterday. You can't even find 03/04 in the dismantling yards anymore.

 

[AH64ID]

Yep... Most will take the wide road BC its the flow to popular believe... Go check on Comp. . Back a couple of years ago 1 member posted pictures form his 03 and late 04 2 different cams. . both motors were 305... Wow its hard to believe its been 8 years for CR . . it seems like yesterday. You can't even find 03/04 in the dismantling yards anymore.

If they were both 305 motors then they "should" have been the same, and points to all the HPCR's having the ability to run the same cam.



I have been told that there was actually quite a bit of variance on grinds from one enigne to the next (same MY), not the best quality control per-say.

 

[Tinman]

There has to be something different in the 03-04 cam and the 4. 5 and up. Jan. 1 of 04 is when the then latest emissions standards when into effect requiring cats (and subsequent 3rd injection event) and egr on everything but the Cummins. Cummins met the standard by "internal" egr caused my significantly retarded exhaust valve timing. Part numbers don't mean a thing. My PDR cam has a stock part #. Apparently, the blank cams have part # before they are ground.