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Old 06-11-2011, 08:37 PM
jason` jason` is offline
 
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Default Vacuum Brake Conversion

Hello, Long time lurker

my 87 T has been down for almost 2yrs do to powermaster problems

I have had enough and want to go the vac route but have an old ATR 7th injector kit which screws me from using the conversion plate

Need some ideas and a big thanks in advance
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Old 06-11-2011, 09:23 PM
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Question Re: Vacuum Brake Conversion

Well, there are other places to pick up vacuum.

But first, why do you have the 7th? What size are the six in the intake, and what size is the 7th? What is your configuration? Maybe an adjustment to the config would let you do without, and use the vacuum adapter up top.
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Old 06-11-2011, 09:38 PM
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Default Re: Vacuum Brake Conversion

It is how i bought the car 10yrs ago, the other 6 don't look stock to me? i see zip ties on them haha "solid black" #927 0280150218 7th inj # 060 028015021
How do i go about to figure out what size they are?

Thanks for the reply

Last edited by jason`; 06-11-2011 at 10:55 PM.
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Old 06-12-2011, 02:44 AM
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Question Re: Vacuum Brake Conversion

http://www.gnttype.org/techarea/fuelsystem/injflow.html

Think you left a number off of your 7th.

Those are all stock injectors.

What turbo are you running?
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Old 06-12-2011, 10:09 AM
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Default Re: Vacuum Brake Conversion

stock turbo

double checked 7th injector came up with the same numbers
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Old 06-12-2011, 11:59 AM
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Question Re: Vacuum Brake Conversion

Honestly, I don't see a good reason to run the 7th. I was able to get my car down to about 12.10 with the stock injectors, and a lot of boost (~20#) after porting things, adding better exhaust and air intake system, etc. Unless you are already at or beyond that point now, it is strictly like having a bananna in your pants. You can always move to larger injectors if need be, and there is no reason your car should not be fixed because of it.

What chip is being used? Is it set up for the 7th?
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Old 06-12-2011, 12:32 PM
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Default Re: Vacuum Brake Conversion

It's an ATR "PIT BULL" chip hp137 R3
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Old 06-12-2011, 01:42 PM
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Exclamation Re: Vacuum Brake Conversion

Chip technology has progressed a fair bit since the ATR (no longer in business) chips of the 1990s. Many use Red Armstrong or TurboTweak chips. The latter are even adjustable, and allow you to adjust several parameters right from the car.

I think it would be fine to remove the 7th, go to vacuum if you must (there are ways to cure Powermaster ills), consider a more recently developed chip, and enjoy the car again.

Not sure that 7th is really helping you at all.
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Old 06-12-2011, 07:51 PM
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Default Re: Vacuum Brake Conversion

update.. got the booster pump running but my pedal still feels hard then soft/brake light on/off when hit the pedal

did the 10pumps with ign off, turn on pump wont run until i hit the pedal

http://www.gnttype.org/techarea/brakes/brakespage.html read that 100x and still could use some help

Thanks

Last edited by jason`; 06-12-2011 at 08:36 PM.
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Old 06-12-2011, 08:57 PM
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Lightbulb Re: Vacuum Brake Conversion

Do you have the grey or black switch atop the unit?

I would strongly suggest draining all the fluid from the reservoirs (maybe with a tube and bottle or with a syringe), then refilling with clean DOT 3, and then bleeding all four wheels (shortest to longest path) in order to get rid of air (and potentially condensation/water) in the system. That might improve brake feel considerably.

Of course, a lot depends on how worn the pads and discs/drums are. If they are still in good shape, doing this might help a bunch.

Observe that the fluid level has to be checked/filled with the system depressurized, as you have noted.
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