JAKE BRAKE ON SCT ??? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 08-07-2011, 07:35 AM Thread Starter
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JAKE BRAKE ON SCT ???

how and what is the jake brake setting on my sct downloader?

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post #2 of 6 (permalink) Old 08-07-2011, 01:57 PM
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It closes the vanes in our VGT to create exhaust back pressure, this allows the turbo to assist in braking my using the motor to slow down the truck. For everyday use it's not that useful, but if you tow it helps slow you down on long down hills to save your brakes from overheating.

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post #3 of 6 (permalink) Old 08-08-2011, 07:17 AM Thread Starter
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Quote:
Originally Posted by lilpooh View Post
It closes the vanes in our VGT to create exhaust back pressure, this allows the turbo to assist in braking my using the motor to slow down the truck. For everyday use it's not that useful, but if you tow it helps slow you down on long down hills to save your brakes from overheating.
will it hurt if i used it daily and doese it engage like a semi jake, when let off the throttle, or after brake is engaged

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post #4 of 6 (permalink) Old 08-08-2011, 10:57 PM
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Quote:
Originally Posted by D.O.C_DIESEL View Post
will it hurt if i used it daily and doese it engage like a semi jake, when let off the throttle, or after brake is engaged
It's designed to work with the tow/haul button when using a tow tune. I've really never heard too much about causing issues with the turbo. I've only used it a couple of times and didn't really see a need for it with the weight I tow (8k).

It works when you let off the go pedal, when ever your in Tow/Haul mode and let off the pedal, the vanes close to cause back pressure. It's really a turbo brake and not a Jake brake.

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post #5 of 6 (permalink) Old 08-11-2011, 09:32 PM
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As stated above, yes, it uses the turbo as an exhaust brake. It's the same thing Ford GM and Dodge offer on the new trucks. The only difference is the newer trucks have additional controls built in to make the feature work more specifically in tow/haul situations.

Basically, it commands the turbo to increase exhaust back pressure above idle and off throttle. It can be changed to be extremely aggressive or progressive. I have worked on these settings in my tuning for some time now, and I have them set up so that I can let off throttle on the flat and coast at 1500-1800rpm in 5th towing, but when I want to decend a grade, drop to 4th or 3rd depending on the grade and hold my speed to 45-55.

I can tell you that if you use an aggressive street, performance or race tune with the exhaust braking enabled, you will get turbo surge as rpm drops. Also, SCT sets the feature a bit too aggressively in their preloaded devices. You will do better with custom tow tunes with it enabled.

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post #6 of 6 (permalink) Old 08-18-2011, 10:56 PM
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Quote:
Originally Posted by D.O.C_DIESEL View Post
how and what is the jake brake setting on my sct downloader?
There is no provision for a "Jake" type brake on any PSD and no tuner, tooner or kit will get it for you regardless of what the marketing department says.

To have a "Jacobs" type brake, you need some way to open the exhaust valves seperately from the exhaust lobes on the cam, no one does this for a PSD, DMax or "B" Cummins.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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