300 HP 6.9

Laine D

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My own 2c - With a stock pump and turbo kit(any), you are looking around ~200 HP at the wheels max. That's probably 260-270 at the crank, which is about what Banks advertises.

You'll probably need an upgraded IP if you want more than that; plain and simple. RD2-110 will net you 250 RWHP with a kit turbo, and probably around 300 RWHP with a better turbo setup(CDD, R&D etc).


Personally, my DD's just got a worn IDIT motor, WW2, stock pump cranked, 4.10s and a 5-speed with GVOD... she probably makes around 180 RWHP.
It's both plenty and not enough - towing a 3K lb flatbed yesterday at 70MPH, I'd go between double OD(equivalent to 5th with 3.55s) and OD; maintaining 70 wasn't too hard.
Towing a decent load back(I'm thinking about 7K on that trailer, so total of 10K), I was in single OD, and had to downshift to 4th occasionally on hills. Maintaining 60 was easy, 70 was really pushing it(~900-1K EGTs in 5th at like 2500 RPM on flat-ish ground).

I've also towed ~14K behind me; it takes a bit to get to 60, but is very easy in the 0-40 range for back roads.
It's very much one of those things where once you get to speed, it's not hard to maintain, but going from a stop requires winding her out in every gear.
Exactly how mine is. Just gotta use all the rpm’s
 

rhkcommander

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Stock pump running balls to the walls with all them mods you suggested prior?

Either way, nice!
 

Laine D

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Here’s 250hp out of a stock pump and stock engine, shooting for 300 out of the stock engine with a pump swap.
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I am basically following after what you’ve done to that truck as it’s pretty basic stuff that promises a good result.
 

franklin2

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It will for sure. I’m on the opposite end from you. 5 speed with 35’s and 3.55’s. Great for staying at 75-80. Terrible at getting there..

That must be really slow. My truck has a stock 7.3 N/A with a 5 speed 35's and 4.10's. I should say had 35's. I just took the 35's off and installed 265/75/16 tires on it. You think I just installed a turbo on it. It drives and pulls so much better without those big tires on it.
 

Laine D

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That must be really slow. My truck has a stock 7.3 N/A with a 5 speed 35's and 4.10's. I should say had 35's. I just took the 35's off and installed 265/75/16 tires on it. You think I just installed a turbo on it. It drives and pulls so much better without those big tires on it.
I’m sure gearing has a lot to do with it.... but 35’s look sooo good. When I solid axle it it’ll either be 3.73’s or 4.10’s so I’m sure that’ll be a lot better even after engine mods.
 

03wr250f

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a 110 pump will lift heads on a 6.9 with studs. I have seen 3 different setups lift heads with a 110. so I would keep it to stock pump cranked up and leave it at that if it were me.
yours to do with as you wish but I would hate for you to lift heads and then get pissed because you didnt know the consequences.
as previously said 200whp is probably close to 300 crank hp
 

Thewespaul

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a 110 pump will lift heads on a 6.9 with studs. I have seen 3 different setups lift heads with a 110. so I would keep it to stock pump cranked up and leave it at that if it were me.
yours to do with as you wish but I would hate for you to lift heads and then get pissed because you didnt know the consequences.
as previously said 200whp is probably close to 300 crank hp
At what psi were they lifting heads? What turbo setup? Were they studded and what were they torqued to? Too small of a turbine side-like a stock turbo- will bottle neck the exhaust and create more cylinder pressure.

A studded 6.9 torqued to 130 ft lbs or more well exceeds the clamping force of a 7.3 with stock head bolts, which I’m running 22psi in the truck that made 250 on a worn out stock engine, with a fresh engine and studs 300 I’m sure is totally doable in a 6.9, 300 on a stock 7.3 is going to be a tougher stretch but I think that’s achievable as well, we’ll see this summer after i do a pump swap on that truck and get it back on the dyno.
 

CBRF3

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A torque cam makes a world of difference in this aspect.
I have been waiting on you to let me know when you can get some more I have 4 stock cams ready to go I messaged you a month or 2 ago about a cam and you said currently dont have access to them.
 

typ4

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I have been waiting on you to let me know when you can get some more I have 4 stock cams ready to go I messaged you a month or 2 ago about a cam and you said currently dont have access to them.
I have 2 on the shelf and im picking up 5 more this week.


Pretty sure I told you I was out of stock.
I always have access, it just takes some time to get them processed.
 
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03wr250f

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both justin wheeler and justin anderson have had a 6.9 over 300whp with head studs and both lifted heads.
both had very efficient turbo setups. Craig clifton on the facebook page was pushing 22psi on a banks turbo kit on a 6.9 with a 110 pump and lifted heads. There have been 1 or 2 others out there that have lifted heads on a studded 6.9 but i dont remember who. I remember the builds on those 3, and remember them all lifting heads. So unless you are having a 6.9 block drilled and tapped for 9/16 or 14mm head studs the 6.9 imo is not reliable for high horsepower/high fuel/ high boost. Yes lots have gotten away with moderate boost on stock fueling/ great on them. I wont recommend it to someone because the likelihood of having a head lifting is quite high. Also no one has yet done 9/16 head studs, so that is still to be proven. that is the reason everyone goes for a 7.3 is because a set of head studs and you are good to go, no one has yet found their limit.
 

03wr250f

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here is my other problem with ''high powered 6.9s" i have a friend with a rebuilt 6.9, 90 cc r&d pump, t19, intercooled, and custom built t4 kit, and similar to a bw362 turbo on it amazingly efficient turbo kit. running down the road his egts are 400*-450 no joke. lowest egts i have ever seen espeicially since my ats 093 kit with stage 1 drop in is running 550-600* driving the same way down the same road. anyway he overtorqued his headstuds to the point of yeilding for the most clamping force possible. was maxing out at 18 psi. switched air filters and removed the muffler, and started making 21 psi and as soon as that happened he started slipping the brand new 12 luk clutch with a empty trailer on the back in 4th gear. What i find surprising is no one else has yet posted anywhere that i have seen about slipping a t19 clutch in 4th gear. It makes me question the people that post saying their truck makes all this power, but yet arent slipping a clutch?
Granted I know most people go zf5 but how come so few are running big clutches?
 
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