TurnedUp

[TrailTamer]

2100 rpm at 70 sounds around right for towing and would've loved that when I was towing through the mountains.

with my 295/70R17 (~33" tall) and 3.55, I turn IIRC just under 1750 rpm at 70 mph, basically lugging a bit when towing heavy or in any high load situation Its a no go when in the mountain, but when I drop it down to 3rd (direct), like your's in 4th, I pretty much can haul ass over the mountain but at a lower speed, ranging 50-60 mph (I don't like to really rev the engine).

What's your boost at higher rpm when towing? I was experiencing the egt than's my liking and it was solved by cranked the starwheel tighter to stop it from running a tad rich. the starwheel control the fueling from ~10psi to max boost, so if you was towing and in that range, the starwheel is important and will affect the engine's performance.

Although, smaller tires will help nonetheless. I'd image myself running the 37's for DD/local use but swap on the small, gay tires for the long haul if i have 4.10.

[Harrison]

Boost was 30-33psi usually. Harder to get over 30 in 4th at highway speeds, but still definitely can. I am suspecting a boost leak and/or wastegate seepage... I have the wastegate signal blocked but may need to use some other mechanical means to keep it from being able to move at all. I have been gradually dialing back the star wheel a little at a time since I got the AFC hooked back up, maybe I do need dial it back a bit more.

2100 at 70 really is ideal, though RPMs much lower than that on hills make me cringe a little knowing that 5th won't take much abuse. 1700 is the absolute lowest mine will do anything with a decent grade.

I have no interest in switching tires for different trips, just going to let it wind out at 65-70 and deal with it.

[TrailTamer]

30-33 psi? thats more than I did had. I was always below 30 psi, but if anything more, my egt go into the red zone.

Matter of fact, I just discovered my boost leak today! I have BAD leak at the elbow where it mates to the turbo's outlet. I even RTV it with no improvement, and will give it another look tomorrow. I'll be pissed if it runs awesome after the boost leaks fixed after my trip, but at the same page, I'll be glad that my truck will have more to offer when it's fixed. The reason I finally take my time to check for any boost leak as no matter what, I had shitty preboost spooling, no smoke or smoky, it prespools poorly, but once it spools, it fine.

[TrailTamer]

what you did to fix the 5th gear nut, if any?

[Harrison]

Do you have an HX35? Maybe 30psi+ is too much and just heating intake and driving up EGTs. I need at least 30 to do a lot of even medium hills. Still seems strange to me that I can be at 1300* at 2500rpm, then shift and drop to 1800ish and EGT goes down to 1200 while maintaining speed.

5th gear nut has a 2nd nut jammed to it and the two nuts are welded together. Nick and Mike have both sheared teeth off of 5th after fixing the nut, though they both regularly gross much more weight than I do 1-2 times a month. Still always in the back of my mind.

[TrailTamer]

yes hx35 however once I hit 30+, egt goes up rather quick so I kinda doubt it but it's a possible.

when my truck goes into overdrive, it does the opposite, my egt usually go up. if i downshift (with no throttle input change) the egt drops. although, i think my boost leak may contribute to this more than anything as when it runs at more rpm, the turbo can more easily keep up with the leak rather than at lower rpm.



swap in an auto and tow worry-free in any gears!

[Nick]

My truck on really long pulls like heading north up to Turkey ranch I have to keep the boost at 30 or less to keep below 1000 degrees post turbo which is the max I ever go.  I really think the tires are killing you. 245 19.5 is the way to go 2250 rpm for like 68 or so mph.

[mr.mindless]

37s are big. No two ways about it. You'd be better off in the stopping dept with smaller tires, no doubt.   that's an easy diagnosis and fix.

Over 32-33, the hx35 will build heat fast. It's too small. That may be why you see what you do Irish boost...

[M4wdFab]

18psi boost and my 24valve would pull pretty good at 20-24K.  still miss that truck every hill   

[Harrison]

Looks like Nick's 245s run about 33" tall, about the same as the 285/75R16s I'd look for.

One text to a friend and the 37s are sold for the $500 I bought them for... deciding whether I should look for quality used or throw a couple extra hundred on there and get something from Treadwright.

[Wingman]

I'm leery of Treadwright these days.  It seems that their new process is troublesome.  Was looking to put new sneakers on the Suburban and my research turned up some recent scary stories.  Bought a new set from Jared.  About $50 more total when figuring shipping, mounting, and balancing.  (that was for a street tread)

[jacel86]

One of these days I need to look up my gearing for my truck. It seems quite happy with an auto and 34.5" tires. But as mentioned before- I'm not exactly maxing out on weight most of the time.

[Harrison]

These get good reviews. Sweet price.



Jared... My guess would be 3.73 or 4.10 but I will also admit you l have a lot more power.

[etk300ex]

Thats what I'm running, I like them.  Treadwrights were like $100 cheaper then these from Jarod. 

[Harrison]

Treadwrights BFG AT knockoff is $50 more for a set and 1/2" taller.

Mark, you read some stuff on a reputable site that scared you off enough to not buy them again??