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Old 01-30-2013, 12:16 AM
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NWRQC NWRQC is offline
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Join Date: Dec 2011
Location: WA
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Vehicle: 2007 RAM
Engine: 2007-2011 409ci (6.7L) Cummins Turbo Diesel 350hp 650lb/ft
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Originally Posted by tmccue View Post
i recently installed the H&S mini and a 4" dp striaght back to 6" stacks out the bed. these are all the engine mods i have done so far.

im having a slight issue with the tuner on wild and hot tunes mostly wild. however much i dont run them often but when i do i sometimes seem to get quick cuts in the power. im just wondering if this tunes requir some helper mods to smooth this out or if it just is what it is. fuel pumps injectors ect? just not sure

Im looking to have a triple plate tq converter made by Sun Coast and a valve body modifications done soon in hopes to save my tranny.

would the H&S overdrive tune be worth the money to get until i can get this done? im kind of unclear how it works and dont want to purchase if all it does is change some shift points.

please if anyone can recomend and problems solves to this or can recomend and upgrades to add to what i have and how they like theres please share.

thank you
Before you get too wild romping on the truck while running a hot tune you might want to invest in some head studs, or you risk blowing your head gasket.
The loss in power is probably due to a drop in rail pressure because the lift pump cant supply enough pressure or the pressure relief valve (on the fuel rail) keeps popping. H&S recommends a fuel rail shim kit if you plan to run the wild/hot tune. On your mini maxx set one of the gauges to monitor the rail pressure and ill bet you'll see it spike around 26K then drop off as the power also drops off.

I would install some ARP 450's (2000) a fuel rail shim then try it again. Shim kits are cheap and easy to install.

The overdrive software is nice and it will prolong the life of your trans if you take care of it. It raises the line pressure to 170psi (stock is 160 I think) which is the highest you can run w/a stock trans and pump. Higher than that all you're doing is heating up the fluid, the pump and not creating anymore pressure. I believe there is a releif valve that will bleed off higher pressures.
As far as the trans, you might want to look into a full rebuild kit from Sun coast or a built transmission. The weak point in the 68rfe seems to be the overdrive clutches and you will notice slipping (chatter) on the higher hp tunes mostly in 5th and 6th gear.
If you are not set on Sun Coast I would look into RevMax they are building a strong reputation with a decent price. If you are not looking to go too wild on the power their 550 trans should work good.
2007 6.7 | EFI-Live | Draconian tuned TCM | T4 S366 | ARP | AFE | Fox | Carli
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