Turbo "Jake" Setting Question
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New User
Joined: Oct 2007
Posts: 23
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From: Boring, Oregon
Turbo "Jake" Setting Question
Hey Everyone,
I have the option with my SCT tuner to use the "jakebrake" option with a tune, which closes the turbo vanes when the accelerator is in the "off" position and it creates back pressure and acts like an exhaust brake... Well my problem is that the tune that has that option also has the "Converter Lockup" option engaged, which doesn't work well if you're using the "Tow/Haul" button for the transmission, the two fight (and if you hit the brake, it unlocks and there goes any braking power you had).... but if it's not on then there is no downshifting when you're slowing down, and there is a big gap between gears 6 & 3, it would be nice to have it downshift automatically like the "tow/haul" button does.
I am wondering if anyone knows how to wire into the VGT so you can turn a switch on that will engage the turbo vanes to full-close when the accelerator is in the off position, therefore giving you back pressure and the exhaust brake effect..... I'm thinking there isn't a way because the <NOBR id=itxt_nobr_2_1 style="FONT-WEIGHT: normal; FONT-SIZE: 100%; COLOR: darkgreen">engine
</NOBR> computer controls the vanes, and that is a coding thing that is changed when the tune is loaded (not just a simple power-on or power-off type of thing). But I'm hoping there's a way, where I can run any tune (or not), and flip that switch and have the turbo vanes close up to give me that back-pressure.
Thanks for your knowledge & input!!
I have the option with my SCT tuner to use the "jakebrake" option with a tune, which closes the turbo vanes when the accelerator is in the "off" position and it creates back pressure and acts like an exhaust brake... Well my problem is that the tune that has that option also has the "Converter Lockup" option engaged, which doesn't work well if you're using the "Tow/Haul" button for the transmission, the two fight (and if you hit the brake, it unlocks and there goes any braking power you had).... but if it's not on then there is no downshifting when you're slowing down, and there is a big gap between gears 6 & 3, it would be nice to have it downshift automatically like the "tow/haul" button does.
I am wondering if anyone knows how to wire into the VGT so you can turn a switch on that will engage the turbo vanes to full-close when the accelerator is in the off position, therefore giving you back pressure and the exhaust brake effect..... I'm thinking there isn't a way because the <NOBR id=itxt_nobr_2_1 style="FONT-WEIGHT: normal; FONT-SIZE: 100%; COLOR: darkgreen">engine
</NOBR> computer controls the vanes, and that is a coding thing that is changed when the tune is loaded (not just a simple power-on or power-off type of thing). But I'm hoping there's a way, where I can run any tune (or not), and flip that switch and have the turbo vanes close up to give me that back-pressure. Thanks for your knowledge & input!!
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
I think you need a custom SCT tune, somehow your jake setting and your tow haul are conflicting. You should be able to run the jake setting with tow haul on and get both working together. In tow haul, tapping the brake should get you a down shift if you have RPM room on a downhill run. It will do this stock, but perhaps, your jake setting the turbo has more hold back and it doesnt need to down shift. You could test with a heavy trailer to see if thats the case, it will push you harder and then when you tap the brake pedal it should down shift more aggressively. I would talk to your tuner. Maybe someone using the SCT with these features can chime in. (I wish I could have one, none in the stocking this Christmas :-()
