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If I recall correctly the stock down pipe is 3.5 inch and so is the the exhaust side of the GTP38R, then you attach the aftermarket 4 inch exhaust to the down pipe or they come with an adapter that goes from stock to 4 inch depending on what manufacturer you are using.
Missed all the answers this morning, had my browser open and didn't reload the page. Sorry.
Did I understand correctly that it won't mate up with 4" turbo-back systems many of us have?
I have 4" MBRP turbo-back system installed and not really interested in hacking it up. The downpipe is installed and fits quite snug.
Is it a limitation of the output of the turbo, or maybe they haven't gotten to "that part of drop in work" yet?
The DP ends just in front of the trans cross member and carson includes the 3.5-4” coupler. With my Banks 4” exhaust, it mated right up with no mods, no cutting and no welding.
Originally Posted by brandon_oma#692
Also I am afraid I am expecting too much. I know you all say how great it is and would love to run a "more powerful" tune rolling along at 24k-30k with egt's like I have an air conditioner blowing in my intake just don't want to end up disappointed because my goal was unrealistic. Time to do some little things I have been meaning to do and save the big stuff for spring. No towing planned till then anyways.
A series of disappointments are the reason why I went with the SXE. When I posted about high EGTs while towing, the responses were “stop trying to tow in OD” or “you need to regear for your 35 inch tires” and “it’s your tuning”.
Even after hearing all of the cheerleading about the SXE, I was still surprised at the results. I am not exaggerating when I say you can literally throw your pyrometer in the trash. I can maintain 38psi, towing my toyhauler (12k) up a grade and not hit 1200 degrees.
I’m pretty sure I’ve posted this already, but here it is again. This is towing a friends toy hauler (8k) into a headwind (about 20, gusting to 30) on a 3-4% grade, in overdrive with 3.73s and 35s. The quality isn’t great, but I started at 62mph/1700rpm and slowly rolled into it to keep it from downshifting and brought the boost up to 34psi and EGTs climbed to 1190, then cooled down as boost came up.
If I recall correctly the stock down pipe is 3.5 inch and so is the the exhaust side of the GTP38R, then you attach the aftermarket 4 inch exhaust to the down pipe or they come with an adapter that goes from stock to 4 inch depending on what manufacturer you are using.
Missed all the answers this morning, had my browser open and didn't reload the page. Sorry.
The flange that mates with the turbo is 3.5 and the 4" pipe is welded directly to that flange.
Did you mean to say that you "can" instead of can't?
Oops! I fixed it, thanks!
Here’s another comparison. Loaded the same, same hill, same speed, nothing changed other than the turbo. Note the difference in intake vs. manifold air temp deltas.
Here’s another comparison. Loaded the same, same hill, same speed, nothing changed other than the turbo. Note the difference in intake vs. manifold air temp deltas.
38r WW2 1200* egt
364.5/74.91 900* egt
Looks to be a cooler day also. Trans temp and oil temp are down quite a bit. Interesting that the FIPK is also down.
The 38R you ran I'm guessing was the older version? It's difficult to find anyone with any KC38R 366 info.
Looks to be a cooler day also. Trans temp and oil temp are down quite a bit. Interesting that the FIPK is also down.
The 38R you ran I'm guessing was the older version? It's difficult to find anyone with any KC38R 366 info.
A 9 degree drop in ambient will not cause a 300 degree drop in EGTs, but a 300 degree drop in EGTs will definitely result in cooler engine and trans oil since both are cooled by the coolant going through the radiator, which is behind the intercooler.
FIPW is a pretty dynamic number for a screenshot, but now that I’m burning what used to be smoke out the tailpipe, I need less throttle to maintain speed.
38r was bought new in 2013 from Riffraff.
I’d also like to see some KC videos, other than a quick WOT run.
I understand that the 364.5SXE is very efficient and runs cool. Although, I have no problems with EGT's now towing heavy up steep grades, so is a 100* cooler EGT reading really worth $1000, not sure.
On your next camping trip, load up a 40-65HP tow tune not a heavy tow tune and report back on the EGTs. I would be curious to see the difference if any
Originally Posted by The Brad
FIPW is a pretty dynamic number for a screenshot, but now that I’m burning what used to be smoke out the tailpipe, I need less throttle to maintain speed.
Better fuel economy too
Originally Posted by The Brad
I am not exaggerating when I say you can literally throw your pyrometer in the trash.
It has been stated a couple times but to clarify, the Down Pipe for the 364.5 is 3.5". You have the option of a 3.5" to 4" or 5" adapter depending on the size exhaust you have. It's a simple and inexpensive connection. A change in tunes is not required. The CSD kit is a very solid kit and installing the T4 isn't more difficult than the pedestal, just different. The mandrel bent 4" pipe that is cut to fit on the intake of your choice is well designed also. I was careful with this and it fits my S&B much better than the arrangement the 38R had. Overall, it is a significant improvement over the 38r in terms of performance and robustness of all the components. Again, the Up pipes are terrific!
I've been driving the truck more the last couple weeks and between all the supporting mods, the PIS 175/80 injectors, 364.5SXE Turbo and 1023 Tunes, the truck drives fantastic-never better.
The injectors provided a massive increase in power but the 364.5 and 1023 tunes refined it and now it feels extremely well balanced. Towing is a piece of cake and it has a lot of power. Completely worthwhile IMO.
