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June 27th, 2008, 12:17 PM
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vacuum brake help
I just change to vacuum brakes and this just will not hold under boost. i have 4 wheel disc brakes too. I have tee in to the pvc valve(is this ok). can not get old 2 to 3 lbs boost before it pushes the car forward. i have read alot of the post on the vacuum change over but mine does not seem to work good. any help on this before i take it back off.
sorry for the double post
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1987 Grand National Precision 68-h turbo, 72#inj, 204-214 cam, Champion iron heads & intake, RJC power plate & boost controller, Precision hat, 70mm t/b, ATR front mount, 200r4 trans, 9-1/2" PTC converter, 3-1/2" THDP, ATR straight shot, Metco upper's & lowers, ATR sway bar, 9" Moser-33 spline, Aluminum center housing, 3.50 gear 60Ft= 1.45 1/8= 6.79 MPH= 101. 1967 SS Chevelle GN poweredwww.cardomain.com/ride/2470743 Last edited by WINDMILL : June 27th, 2008 at 12:19 PM.     
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June 27th, 2008, 12:21 PM
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You should get a better vacuum source and ensure the brakes have been bled correctly including pushing the plunger in on the prop valve on the frame for the duration of the bleed. I noticed I had better holding power when I moved my vac src from the pcv tee to one of the TTA style vacuum blocks.
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Steve '87 GN - Powerlogger/Scanmaster, TT Street Chip, ANS Electronic Boost Controller, PLX M-300 WB, Hot-wired Walbro 340, AlkyControl, Kenne Bell Ram Air, 3" dumped DP, TiAL BOV, TiAL WG and an ESP FMIC...for now...
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June 27th, 2008, 12:23 PM
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change
i wil change the vacuum sorce now and try that. will get back soon on that.
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1987 Grand National Precision 68-h turbo, 72#inj, 204-214 cam, Champion iron heads & intake, RJC power plate & boost controller, Precision hat, 70mm t/b, ATR front mount, 200r4 trans, 9-1/2" PTC converter, 3-1/2" THDP, ATR straight shot, Metco upper's & lowers, ATR sway bar, 9" Moser-33 spline, Aluminum center housing, 3.50 gear 60Ft= 1.45 1/8= 6.79 MPH= 101. 1967 SS Chevelle GN poweredwww.cardomain.com/ride/2470743
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June 27th, 2008, 01:26 PM
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Quote:
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87 Turbo-T, bolt-ons....
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June 27th, 2008, 01:34 PM
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Have you checked the check valve?
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2004 Caddy SRX-Comfortable Cruiser 2002 TDI 5-spd Beetle-49 MPG 2003 3500 Dodge Ram Dually, 6 spd HEAVILY BOMBED Cummins- Camper Puller. 87 T-Top GN Xp Pump, Accufab Reg, Hot-wire, Volt Booster, Dutt Big Mouth IC w/Alum adjustable scoop, KBelle Valve springs, HD rocker shafts, Auto-Meter Carbon-Fiber Gauges, Weld Wheels installed. Chip, braces, New Turbo, headers, crossover, RJC Plate, THDP downpipe and 60# injectors, elec boost control, Direct-Scan, on the bench waiting for time. Now about that Razor Kit!!!
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June 27th, 2008, 01:41 PM
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also dont forget to try the old sy/ty trick.... right before you goto bulid up boost throw the car in "n" and give it a couple rev's while pressing the brake down hard... then just put it back into drive and start buliding boost
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87 we4- under going a major rebulid soon no more playing around.....
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June 27th, 2008, 03:17 PM
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none
i done what jim as done on the neutral thing. also has a new check valve in it too. it wont hardly hold 1 to 2 # of boost. i have some thing wrong. maybe the master cly is bad or something. the pedal is not firm like it sould be.
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1987 Grand National Precision 68-h turbo, 72#inj, 204-214 cam, Champion iron heads & intake, RJC power plate & boost controller, Precision hat, 70mm t/b, ATR front mount, 200r4 trans, 9-1/2" PTC converter, 3-1/2" THDP, ATR straight shot, Metco upper's & lowers, ATR sway bar, 9" Moser-33 spline, Aluminum center housing, 3.50 gear 60Ft= 1.45 1/8= 6.79 MPH= 101. 1967 SS Chevelle GN poweredwww.cardomain.com/ride/2470743
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June 27th, 2008, 03:21 PM
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May need to bench bleed that mstr cyl and then re-bleed the lines after.
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Steve '87 GN - Powerlogger/Scanmaster, TT Street Chip, ANS Electronic Boost Controller, PLX M-300 WB, Hot-wired Walbro 340, AlkyControl, Kenne Bell Ram Air, 3" dumped DP, TiAL BOV, TiAL WG and an ESP FMIC...for now...
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June 27th, 2008, 03:23 PM
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done that
we have done that to, and let the line just run fluild out for a while to blead itself.
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1987 Grand National Precision 68-h turbo, 72#inj, 204-214 cam, Champion iron heads & intake, RJC power plate & boost controller, Precision hat, 70mm t/b, ATR front mount, 200r4 trans, 9-1/2" PTC converter, 3-1/2" THDP, ATR straight shot, Metco upper's & lowers, ATR sway bar, 9" Moser-33 spline, Aluminum center housing, 3.50 gear 60Ft= 1.45 1/8= 6.79 MPH= 101. 1967 SS Chevelle GN poweredwww.cardomain.com/ride/2470743
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June 27th, 2008, 09:19 PM
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Get the TTA vac block and go to the booster from the top of the TB. Whats your vacuum numbers at idle?
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87GN GT6776bb, 206/206 roller, 60# inj, PTE Stock Loc. IC, Tranny built by B. Hofer, PTC 10" 2800 Conv, Turbotweak, 93 octane & Alkycontrol No track times with new converter/engine combo...yet.
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June 28th, 2008, 12:30 PM
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thanks guys
well thanks for all the help on this brake deal. I just sprung for the hydroboost system from bob. i hated to do it, but i think it will be better in the long run for me. If anyone needs a vacuum setup mine is for sale. its works great reg driving tho, but not holding boost at the starting line for me.
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1987 Grand National Precision 68-h turbo, 72#inj, 204-214 cam, Champion iron heads & intake, RJC power plate & boost controller, Precision hat, 70mm t/b, ATR front mount, 200r4 trans, 9-1/2" PTC converter, 3-1/2" THDP, ATR straight shot, Metco upper's & lowers, ATR sway bar, 9" Moser-33 spline, Aluminum center housing, 3.50 gear 60Ft= 1.45 1/8= 6.79 MPH= 101. 1967 SS Chevelle GN poweredwww.cardomain.com/ride/2470743
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