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Old 04-28-2008, 06:17 AM   #1
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Default TH400 vacuum modulator????

Something I never put much thought into, but what are you guys using for this on a turbo application? Any schematics or diagrams would be appreciated. What about the electric kickdown, I wonder if I can trigger that through the big stuff 3 via TPS, non trans control version.
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Old 04-28-2008, 09:12 AM   #2
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You could run the downshift off the wire for the second fuel pump, that is adjusted by tps. The vac thing I am not sure what you would need to do, but you can't have pressure on the trans. Probably need a one way check valve in the line with a controlled leak.

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Old 04-28-2008, 09:46 AM   #3
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I'm curious about this as well, because I'll be running a Th350 with a VM too.

I hope someone chimes in. I've never thought of that either.
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Old 04-29-2008, 01:27 PM   #4
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Quote:
Originally Posted by 427 View Post
You could run the downshift off the wire for the second fuel pump, that is adjusted by tps. The vac thing I am not sure what you would need to do, but you can't have pressure on the trans. Probably need a one way check valve in the line with a controlled leak.

Kurt


Transgo makes a kit just for turbo/supercharger vacum to boost, it does have a check ball. However you can set the modulator just right and run it with no vacum it will work great.
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Old 04-29-2008, 01:52 PM   #5
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Just put a T in the vac supply to the modulator and put a checkvalve (like for a/c or cruise) on one port so it closes under vacuumand opens under pressure. Or you could just buy one on ebay Ive seen them on there.
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Old 04-29-2008, 01:58 PM   #6
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Or you could just buy one on ebay Ive seen them on there

Are you talking about the previously mentioned TransGo kit?
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Old 09-20-2008, 07:02 AM   #7
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any part numbers?
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Old 09-20-2008, 10:18 AM   #8
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Quote:
Originally Posted by 427 View Post
You could run the downshift off the wire for the second fuel pump, that is adjusted by tps. The vac thing I am not sure what you would need to do, but you can't have pressure on the trans. Probably need a one way check valve in the line with a controlled leak.

Kurt
could you not run that vacume line to the pre turbo for vacume?
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Old 09-20-2008, 11:13 AM   #9
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Quote:
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could you not run that vacume line to the pre turbo for vacume?
Not enough vac there, is there? I just went with a full manual valve body with a hammer shifter. I think it's great.
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Old 09-20-2008, 12:01 PM   #10
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Quote:
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any part numbers?
VBP-VAC

It's been recommended to me to run two in series at high boost levels to make sure all the boost is being vented.
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Old 12-08-2008, 07:43 AM   #11
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I just picked up the Transgo VBP-VAC, pretty simple check valve, but when it goes under boost, the check valve will close, and it vents the boost out one of the ports on the "t", so it does not go on to the modulator. My question is, does that create a boost leak? It just goes to atmosphere. Anyone using one of these?
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Old 12-08-2008, 11:54 AM   #12
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Here is a diagram.
Click the image to open in full size.
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Old 12-08-2008, 06:18 PM   #13
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I'm using one, I guess it is a boost leak, but it must not be big enough to make a difference b/c my car makes the boost it should.
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Old 12-08-2008, 06:23 PM   #14
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Quote:
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My question is, does that create a boost leak? It just goes to atmosphere. Anyone using one of these?
Technically yes, but as long as you put it at the transmission, it should be fine.
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Old 12-08-2008, 06:23 PM
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4003, affect, boost, charger, diagram, engine, full, manual, modulator, supercharged, supper, th400, trans, transgo, vacuum, vbpvac


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