Looking to build a 600HP when Towing LB7

[Ofroadunleashed]

I am looking to build up my current setup to be able to tow with it turned up. This is the current setup;

LMM/LBZ rods
LB7 Crank (keyed)
Delipped Mahle Pistons
O-Ringed Head
Injector Cup Hold downs
EMC Head studs
Stock CP3 (100,000km old)
Ryans Diesel Supercore 64mm
3.5" Intake Horn
3" Downpipe
PPE Race Fuel Valve
Stock Injectors
FASS 95 Lift Pump
Duramaxtuner tune w/ DSP5
ZF6 6 Speed w/ Southbend Dual disc


Made 512.4HP & 822.7FT-LB when I first put this together a few years back.

It seems currently I'm running into some higher EGTs when towing and I need to redo my intercooler piping and replace injectors anyways so I'm open to options.

 

[Chevy1925]

You need compounds to get egt’s down enough. 45% over injectors or larger, 100% overs work well. More cp3 as that pump will be maxed out. I’d suggest better rods as you will be after more torque for towing.

Next big issue is keeping it cool. Since you say the pump mileage in kilometers, im assuming youre in canada. It will be an easier time to stay cooler there but you will want a 2020+ oil cooler, fuel cooler is a good idea, probably going to meed to add a scavenging pump to the trans and cool that oil through a cooler, better intercooler and possibly need a aux radiator. Billet fan hub isnt a bad idea but a kennedy clutch would be one i start with

Ive been down this road in my 02 making 600rwhp tow 26k gross in the middle of az summer heat. Ive done a shitload of testing and experimentation. At the end of the day, engine cooling was always the issue

 

[Ofroadunleashed]

You need compounds to get egt’s down enough. 45% over injectors or larger, 100% overs work well. More cp3 as that pump will be maxed out. I’d suggest better rods as you will be after more torque for towing.

Next big issue is keeping it cool. Since you say the pump mileage in kilometers, im assuming youre in canada. It will be an easier time to stay cooler there but you will want a 2020+ oil cooler, fuel cooler is a good idea, probably going to meed to add a scavenging pump to the trans and cool that oil through a cooler, better intercooler and possibly need a aux radiator. Billet fan hub isnt a bad idea but a kennedy clutch would be one i start with

Ive been down this road in my 02 making 600rwhp tow 26k gross in the middle of az summer heat. Ive done a shitload of testing and experimentation. At the end of the day, engine cooling was always the issue

Thanks for the info. I'm open to whichever size injectors would work best. I was leaning more towards S&S 100% SAC's based on some recent digging. If it needs more pump then I will go that way for sure. I would like to not tear into the internals anymore. It has been a bit of a sore subject so if I need to limit the hp a bit I will do that. I will look into the oil cooler. The fuel cooler, are you recommending a larger fuel cooler than the stock one near the tank? Trans heat management is definitely worth getting sorted. I am in Canada and have not yet ran into heat issues but coolers have never hurt.

What would you recommend for a compound setup?

 

[N2BRK]

I know you don't want to tear into her again, but I don't see keyed cam on your list.

 

[Ofroadunleashed]

I know you don't want to tear into her again, but I don't see keyed cam on your list.

Yeah, I don't know for certain. It could be done. I had a lot of communication issues with the engine builder. Best to consider it not done I suppose.

 

[gmduramax]

What’s your intake setup like? Also I didn’t see intercooler on your list

 

[Bdsankey]

Personally I would compounds, more injector and pump than you have, and as stated quite a bit of cooling modifications.

If you're after dropping EGTs a 480/96/1.32 over stock will work great, especially after you port/polish your turbine housing.

Injectors I would go 100% myself. Dynomite is my personal go to injector company and they're having a 15% off sale for Black Friday that's live until 12/2.

2020+ oil cooler is a great start as well.

Fuel cooling you can replace the OEM unit if your fuel temps are getting high. Derale and Setrab both have coolers that fit pretty well where the OEM unit is that cool very well.

Trans cooling you may need to upgrade but time will tell. Mishimoto is the best cooling unit I have personally used.

I would suggest looking at a more efficient intercooler as well. I personally recommend Northern Radiator/BD or Banks as they are an extruded microfin core that is insanely efficient and strong.

 

[Chevy1925]

Personally I would compounds, more injector and pump than you have, and as stated quite a bit of cooling modifications.

If you're after dropping EGTs a 480/96/1.32 over stock will work great, especially after you port/polish your turbine housing.

Injectors I would go 100% myself. Dynomite is my personal go to injector company and they're having a 15% off sale for Black Friday that's live until 12/2.

2020+ oil cooler is a great start as well.

Fuel cooling you can replace the OEM unit if your fuel temps are getting high. Derale and Setrab both have coolers that fit pretty well where the OEM unit is that cool very well.

Trans cooling you may need to upgrade but time will tell. Mishimoto is the best cooling unit I have personally used.

I would suggest looking at a more efficient intercooler as well. I personally recommend Northern Radiator/BD or Banks as they are an extruded microfin core that is insanely efficient and strong.

Its a zf-6. Mishimoto does not make anything im aware of for that manual trans

 

[Bdsankey]

Its a zf-6. Mishimoto does not make anything im aware of for that manual trans

That’s me being potato brained. You’re correct I just can’t read


Sent from my iPhone using Tapatalk

 

[clrussell]

What are you planning on towing and how far?

My lb7 I towed my boat on compounds (480 over billet stock turbo with 45%.
I had one tune. Max effort.

It never blinked. I even put head bolts in it for shits and grins.
Blew the tires off at 60 one day trying to pass someone.

Even towed a few cars with it. Boat weighed about 6500.

But James has towing on big power to an art. Hell he doesn’t even cut it a break, just stands in it until the coolant/ oil temps creep to the point you have to let up. ?

 

[malibu795]

Its a zf-6. Mishimoto does not make anything im aware of for that manual trans

IIRC doesn't the ZF-6 have a PTO cover?
I've ran these on NV4500s

Fast Coolers | Manual Transmission Product

FastCoolers is a leading provider of manual transmission cooling solutions. Designed to reduce heat buildup, improve performance and extend the lifespan of your transmission. Our heat dissipating aluminum coolers provide more oil capacity, which means your transmission stays cooler for longer.

www.fastcoolers.com

I've seen guys have stand alone electric pumps to pull fluid out and push it through a cooler then usually back in the trans at the fill spot.

Definitely curious to how much and how often one plans on towing?

I'd add HS/MS as well to that build.
This a max effort ~600 and daily like 450-500
Or planning on daily at ~600?

Cooling while towing is going to the be biggest issues. Mainly ECT/EOT/EGTs

That 64 will get you 600+, down side you're leaning pretty hard on it. Probably not ideal for towing high wind drag/heavy loads for long periods of time.
As others mentioned a S480 equivalent would work nicely.

Definitely need a CP3 upgrade.. sportsman or 10mm pump would be right up there.


How hard would it be to graft a larger LBZ/LMM fan blade into the older trucks?
I know DHD has LBZ/LMM water pump with the LB7/LLY inlets welded on.

 

[Chevy1925]

I’d just put an adapter in the drain and fill. Pull from drain, shoot back in at fill plug

 

[LB7StillAlive]

Injectors and larger intercooler would definitely help as others have said. If you’re not wanting to get into the internals, then perhaps smaller injectors, 45% maybe, a 10mm Stroker CP3 to feed some fuel and a Moshimoto cooler to work on the temps.

My fear is getting into the 600+ is flirting with when not if the internals start to fail.