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08-25-2014, 05:31 PM
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#1 |
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Booooosted.
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Cams and brake booster vacuum...
What I want to know in this thread is how many people have had braking problems after swapping cams?
So I did do a search and didn't come up with any specific info. My car is only producing 8 inches of booster vacuum. Our V6 Jeep and Bonnies C6 Vette are producing 13.5 and 16 inches. All was fine before I pulled the engine and rebuilt and reinstalled. Only differences are basically a bigger cam, lower compression ratio (from the original 10.4:1 to 10.1:1, and haven't yet tuned for the new set-up. My cam is as follows........... I get the reading from both the manifold stem in the rear or the blower and at the brake booster ports in front. I have not heard much talk of big cams causing power braking issues and I have eliminated all other possibilities other than the rotors so rusty they can't stop as fast. (which seems unlikely) My particular car is another thread so the question here is How many people have had braking problems after swapping cams?
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08-25-2014, 06:35 PM
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#2 |
    
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I've had 3 different cams in my car already, from 0 overlap to +5* up to +10*. Never a brake issue.
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08-25-2014, 07:47 PM
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#3 |
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Booooosted.
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I suspect I'll find as much.
Did you have a blower on any?
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08-25-2014, 09:06 PM
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#4 |
 
Drives: n/a Join Date: Apr 2014
Location: USA
Posts: 305
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No issues here
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08-25-2014, 09:20 PM
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#5 |
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Booooosted.
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That's pretty much what I've been getting everywhere I've looked.
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08-25-2014, 09:43 PM
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#6 | |
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Quote:
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08-26-2014, 08:34 PM
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#7 | |
 Drives: 2011 2SS/RS IOM/PEARL STRIPES-6M Join Date: Mar 2011
Location: DFW
Posts: 151
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Quote:
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Whipple S/C, 3.750 pulley, JRE rough idle blower cam kit, Trunion upgrade, C5R timing chain, LS2 chain dampner, Melling 10296, Dynatech 1 7/8 LT headers, OR pipes, Dual valve RX catch can, ID 850 Injectors, LPE Dual fuel pump, CAI with Apex scoop, VMax ported T/B, ADM Tune 675 RWHP 560 TQ
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08-28-2014, 12:19 PM
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#8 |
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Fourmz
Drives: 2010 2SS/RS 1968 Firebird 1994 Z28 Join Date: Sep 2009
Location: Soldotna,Alaska
Posts: 382
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Ive had 2 different blower cams and 1 N/A and never had any breaking problems.
JRE smooth idle cam (current setup) JRE rough idle cam JRE 455rwhp rough idle N/A cam (Pulled when I went FI)
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Black-in-Black/Blue out 2010 2SS/RS LS-3 -Magnacharger TVS2300,OD cog belt drive, 3.4" pulley, Janetty smooth idle blower cam,ID-850 injectors,ZL1 fuel pump,MSD boost a pump, ADM FPCM Janetty custom tune,Doug Thorley long tube headers, Corsa catback,C.A.I. Intake, Roto-Fab Big Gulp Scoop, Monster LT1/SC Clutch assembly,Eibach pro kit plus, BMR cradle/diff bushings, Barton Shifter,JRE 3.91 Eaton Tru-Trac rear diff,Barton Short Throw SHifter, Boss 339 20" wheels,Painted heritage grille, Sparks Restoration Inverted blue/black SS emblems, Seibon BB carbon fiber hood, ZL1 front bumper conversion.
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08-28-2014, 12:22 PM
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#9 |
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Booooosted.
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Thanks guys for the input.
I wonder if anyone had a drop in vacuum but unnoticeable.
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08-28-2014, 12:36 PM
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#10 |
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Senior Camaro Fanatic
Drives: 2011 SS/RS manual - White Join Date: Aug 2010
Location: aiken, sc
Posts: 1,980
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I'm with the leak crowd or the bypass not exactly right deal
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Former '68 and '69 Z/28 Owner...........Now sporting around in a 2011 RS/SS with........Kooks LT's and cats, JRE tune, CAI, scoop, ZL1 Bumper conversion, custom ZL-1 grille, halo harness, Painted silver stripes, GM GFX, black painted lower edge of skirts and rear bumper. MGW shifter.....and now a 3.91 1LE diff
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08-28-2014, 09:43 PM
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#11 |
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Eh, that'll happen
Drives: 2010 2SS Join Date: Apr 2012
Location: Mesa, Arizona
Posts: 1,841
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In the last issue of CamaroNow, they had Brian Tooley spec 3 different cams, all more aggressive than the other. They measured engine vacuum with all the 3. The first 2 didnt have much affect on vacuum. The third one did, but that was a donkey dick cam that literally had .004" PTV. He said that cam was not for sale, only for this test. I believe it was 236/24x in that range. You are no where near that. Did you change the intake gaskets on the blower manifold?
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2010 Camaro SS LS3 - No Modz
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08-29-2014, 12:31 AM
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#12 | ||
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Booooosted.
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Quote:
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I'm a little surprised that nobody thinks that the overdrive pulley spinning the blower faster than standard could be the deal.
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08-29-2014, 12:40 AM
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Eh, that'll happen
Drives: 2010 2SS Join Date: Apr 2012
Location: Mesa, Arizona
Posts: 1,841
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Blower speed doesnt matter since the bypass is before the rotors. If your bypass isnt opening, then ya, thats definitely your problem. But if the butterfly is open, you can spin the rotors as fast as you want.
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2010 Camaro SS LS3 - No Modz
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08-29-2014, 01:24 AM
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#14 |
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Booooosted.
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My boost gauge shows 8 inches (mechanical gauge with hose going in rear next to MAP sensor) and the brake booster tube (going in behind the throttle body) shows 8 inches as well.
The blades turn faster and the manifold pressure goes up right? The reason I was thinking this is because the total manifold vac is the same as the brake booster pressure.
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