Since this turbo is water cooled are you using any type of coolant bypass setup?

 

Excellent writeup! I can't remember for the life of me the name of the business that Tom works for. Can you post contact info or web link?

I need to see if he has 2nd-gen friendly setups.

JH

 

^^^ Tom is at Turbo Resource in Lake Havasu AZ....

one sec while I pull up his number;

928-505-4610

Tell him I sent ya...

 

I was playing with the truck empty and it appears that my WG is opening at 27 psi, I climb super fast to 27 and it stops in 4th and will slowly climb to 29ish in 5th... So 2.5 more turns on the WG rod will happen this week.

No coolant bypass, but I do have a coolant filter..

Tom is a great guy!!

 

Not sure if you are asking if he is using something like an opies bypass or something else... however:

There is a metal tube for coolant that comes up the block near the oil filter housing, runs along the top of the exhaust manifold and plugs into the back near the firewall. All that is needed is to eliminate that tube, run a coolant line straight to one side of the turbo and from the back side run it to where the tube plugged in. An adapter on one end and union on the other are all that is needed. It really is that easy.

An Opies bypass or similar is not needed with respect to the turbo itself.

 

Yep very easy, everything was included in the kit.

 

Thanks, fellas. I just couldn't remember the name of Turbo Resource since I was first getting hip to the Garretts back in '08 or so when Hammer (andy) was giving his all the love.

JH

 

I meant filter, sorry, I'd like to throw a filter on mine I have been looking for mounting solutions since I am probably ditching my bumper for a Prerunner style and all the mounting solutions I've seen are behind the stock bunper.

 

Behind the bumper works on most bumpers, but the prerunner style...

 

so I take it thats where yours is?

 

Yes it is.

 

AH64ID one more question, since you had a drop in DP, did you notice any change in the MPG that you are getting?

Joe

 

It appears mileage is slightly up, but I also noticed my overheard error is up about 5% more.

Empty cruising is probably where the biggest gain will occur, but I haven't done enough yet to know.

 

I have had the turbo on the truck for about 3500 miles now, with about 1525 of those miles towing, some hwy, fwy, and FS roads. About 1100 miles of empty fwy/hwy cruising and the rest is around town and FS roads. Here is my updated overall impression.

I still feel the turbo is superior to stock in every form. The hottest I have seen is still the ~1225° WOT in 6th at 1600 rpms with a trailer on a hill, and that was on SW1 on the SJR, SW3 peaks about 1190° as there is more boost from the increased exhaust flow.

DP is nearly always 1:1 or better. Empty cruise with EGT’s below 900° its about 1-1.5 psi higher than boost , and WOT acceleration above 2500 rpms will give about a 1.2:1. Towing at constant rpms its right at 1:1 95% of the time. If the EGT’s are at 1100° or above the drive pressure can get as low as .8:1 on a grade (I have noted more than once 24-25 psi of boost with 20-22 psi of drive on a grade). This is one efficient turbo!

I have been running SW3 on the SJR and the EGT’s reported here on on that setting (SW3 TM2 TQ2 PoD99.. uncorr 386/712 without any of the bolt on mods). EGT’s are generally 600-800° in 1-4th gears, but can hit 1000° with a big hill and load. 5th and 6th gears run 700-900°cruiseing around here with the elevation changes, and big mountain passes will see approx 1050°max when empty and 8-12 psi of boost. If I had to pick the turbo’s favorite EGT is would be 1000°, towing or empty that seems to be where the turbine starts to gets it’s peak efficiency at, the EGT’s will climb quick to near 1000° and then only slowly go up from there. When towing in 6th gear it runs between 900-1100° except on the biggest of hills where is will slowly climb to a peak of 1190°, I have yet to break 1200° except where noted earlier. If I drop to 60 in 5th it generally runs at about 800-1100° depending on the grade, but it takes over 70% load to get the EGT’s above 1050°. I recently pulled rye-grass hill (I-90) at 50 in 5th at 7spi and 800° (was slowing for the u-haul following me) at about 15K GCW.

I think with my current power setting the turbo is well matched for the fuel, I am not sure I would get above my personal limits of 1250° continuous/1300° momentary above 2000 rpms in any gear, but especially 6th. Based on what I have seen I can probably pull just about any mountain pass (curves aside) in 6th up to 18-19K GCW and have the power/EGT’s to do so.
Fuel Efficiency is really much harder to quantify an increase/decrease than most want to think, but I would say that I have seen about a 10% increase in cruise economy, and probably 5% in slow speed towing. I recently got an average of just above 14 towing a 7x16’ enclose trailer at an estimated 15K GCW from Bozeman to Seattle, normal flats speeds were 65 and hills were 45-60 depending on curves. Then returning from Seattle to Boise I got right around 19 (had some mixed towing but the math points to 19 flat on the last 500 miles), with a bed full of furniture and appliances at an average speed of 66, my previous best on that trip with an empty bed was 17.25 with more timing.

Towing or empty the IAT’s seem to hold 6-10° (a/c off) and 9-12° (a/c on) above ambient unless pulling grades, then +30° is still the hottest I recall seeing at 25psi of boost. The compressor is very efficient.

Oil pressure is still holding a few psi higher than it ever was with the stock turbo and doesn’t drop as much pulling grades, the higher oil flow thru the stock turbo must have heated the oil more than I thought.

Coolant temps seem to run a little cooler as well. I am not sure what is causing the lower coolant temps, if it’s the lower drive pressure and thus better flow thru the cylinders so lower cylinder temps, or if it’s from lower heat soak from the wrapped manifold/turbo, or what.. but I have yet to break 198° this year in the last 1525 miles of towing, and the thermostat isn’t even fully open until 207°.

 

Nice detailed review!

I like how you have all the data for a scientific report instead of the typical seat of the pants reviews I have seen in the past.

Maybe you should send this in to Garrett. I'm sure they would love to publish the condensed version on the site.