SVTWillis
Full Access Member
I have the JDM 700 kit in my 14. It’s night and day from the Roush tune. I have nothing bad to say about it other than your gas mileage will go down because it’s too hard to keep off the throttle lol.
JDM engineering 700 HP kit
- Thread starter Brettsvt33
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I bought and installed it. I’ll add the opinion that you would save $500+ by putting this kit together without the throttle body. The racing TB is very pretty, but I don’t think it improves much vs stock TB for the price ($700~). Something to think about.
vegascarnut
Full Access Member
I agree, based on the fact that big torque early in the RPM range is what moves these heavy trucks. If you look at the throttle body that Indmar Marine uses on their Roush Raptor ski boat engines, it's a big single, not a dual. I think it's actually smaller than the stock twin Ford TB on the trucks, and still makes huge torque and 575 hp. You'd have to look at a CFM chart on the TVS blower to see the point where the RPMs generate enough CFM to warrant that bigger t-body. Most likely it's in the upper RPMs. Or just look at a dyno graph comparing the two, and I bet it shows the same thing—upper RPMs.
Once you pop, you can't stop!
vegascarnut
Full Access Member
Heard this before, and while it’s ok to have an opinion, that’s all it is. The fact is that companies like JDM and VMP have tuned more of these trucks than anyone, and they aren’t guessing. They are working directly from the programming in the Ford ECM, an understanding of your engine, and with data logs from your specific vehicle. It’s actually a very tailored and informed approach to tuning these trucks. Not discounting a dyno tune at all, but to say it’s SO much better is just incorrect. I’ve had both. I’m running a JDM tune that has been tweaked by JDM after some data logging and it’s the best tune I’ve had on this truck, or my Mustangs for that matter.
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BoostedToy
Full Access Member
I have a VMP and echo Vegascarnut.
B E N
FRF Addict
Having dug deeply into the tuning on these: dyno tune isn't anything magical. It would take a lot of dyno time to be able to replicate the tuning knowledge that JDM or VMP have. A single dyno tuning session on a power adder truck is likely to leave you with a truck that makes mediocre peak power and has terrible driveability.
There aren't any unique parameters or specifications that would make one truck different enough from another with the same upgrade package, you are much better off to have a tune written by one of these companies that is truly smart on the truck than the local dyno guy who may have never touched a raptor before.
There are pages and pages of parameters for one of these trucks, thousands of things that could be changed, having someone who knows which ones to change to achieve a specific goal is what gets the job done well. Fortunately the ECM strategy is similar to a coyote so most mustang tuners should be able to get through it.
The rest is just the ECM reacting to sensor inputs, and doing what it is told by the tune and strategy. Download VCM suite and a raptor tune from the hptuners forum, you will quickly see how much stuff there is for a neophyte to work through.
Ford sends every batch of these out with the exact same tune, works fine. Dyno tuning is really only necessary if your doing something where there isn't already a known recipe. There is a lot of freedom in the tuning, its not perfect science that is only obtainable on a dyno.
There aren't any unique parameters or specifications that would make one truck different enough from another with the same upgrade package, you are much better off to have a tune written by one of these companies that is truly smart on the truck than the local dyno guy who may have never touched a raptor before.
There are pages and pages of parameters for one of these trucks, thousands of things that could be changed, having someone who knows which ones to change to achieve a specific goal is what gets the job done well. Fortunately the ECM strategy is similar to a coyote so most mustang tuners should be able to get through it.
The rest is just the ECM reacting to sensor inputs, and doing what it is told by the tune and strategy. Download VCM suite and a raptor tune from the hptuners forum, you will quickly see how much stuff there is for a neophyte to work through.
Ford sends every batch of these out with the exact same tune, works fine. Dyno tuning is really only necessary if your doing something where there isn't already a known recipe. There is a lot of freedom in the tuning, its not perfect science that is only obtainable on a dyno.
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vegascarnut
Full Access Member
Exactly. People worry so much about cookie cutter tunes when they are installing them on cookie cutter trucks.
Square pegs are already sized to fit the square hole—perfectly.
I will add though that our ****** ACN91 Fuel out here resulted in some light pinging which had to be sorted out. Easily done with some data logging and an email or two.
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