|
Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
|
Thread Tools | Search this Thread |
05-10-2022, 07:56 PM | #15 | |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,286 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
Quote:
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
|
05-10-2022, 08:37 PM | #16 |
Join Date: Apr 2021
Drives: BRZ
Location: Virginia
Posts: 568
Thanks: 89
Thanked 711 Times in 325 Posts
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
|
Well then, go to the brake booster and follow the vacuum line? Does it go to an external vacuum source like the 2022 models?
|
05-11-2022, 08:12 AM | #17 |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,286 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
The auto goes to a separate pump. The manual does not. That is the whole point of this question.
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
05-11-2022, 11:52 AM | #18 |
Senior Member
Join Date: Jan 2014
Drives: FR-S,GTI
Location: Cocoa, Florida
Posts: 1,156
Thanks: 228
Thanked 824 Times in 419 Posts
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
|
What do the boosted guys do for vacuum?
If you have a positive manifold pressure you won't have any vacuum for the brake booster. I know my GTI has a vacuum generator to boost the brakes to counter act the turbo. What gives? |
05-11-2022, 01:26 PM | #19 | |
I may be an idiot
Join Date: Jun 2014
Drives: Winona - White 2014 Scion FR-S
Location: Omaha, NE
Posts: 159
Thanks: 37
Thanked 56 Times in 28 Posts
Mentioned: 3 Post(s)
Tagged: 2 Thread(s)
|
Quote:
To further the point, and Edelbrock Supercharger on these cars is the same for AT and MT, and it needs vacuum for the bypass valve. If the vacuum was different on MT and AT, then the Bypass vacle should act differently or incorrectly if you have an AT, which it does not.
__________________
Winona, My Wingless Angel Edelbrock SC w/ Flex Fuel - 18x9.5 Titan 7 wheels w/ 265/35x18 Michelin PS4S - Radium Dual Catch Cans - Verus Aero - OEM Brembos - Prototype HVT 6100e Dynamic Dampening Coilovers - JDL 4-2-1 EL / OP / Dual Catted FP w/ Greddy SP Supreme Catback |
|
05-11-2022, 01:28 PM | #20 | |
Senior Member
Join Date: Aug 2015
Drives: None
Location: Arizona
Posts: 922
Thanks: 1,484
Thanked 1,239 Times in 525 Posts
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
|
Quote:
As long as the booster and check valve aren't leaking then you will regenerate booster vac on decel. It is possible to get into a case where you get on and off the brakes without lifting throttle under boost and that ends in a hard pedal, but it is a series of steps that doesn't normally happen, especially in a RWD car. I experienced it in a turbo Miata and it was an interesting discovery.
__________________
|
|
The Following 3 Users Say Thank You to RedReplicant For This Useful Post: |
05-11-2022, 01:33 PM | #21 |
I may be an idiot
Join Date: Jun 2014
Drives: Winona - White 2014 Scion FR-S
Location: Omaha, NE
Posts: 159
Thanks: 37
Thanked 56 Times in 28 Posts
Mentioned: 3 Post(s)
Tagged: 2 Thread(s)
|
Not sure. If the vacuum lines are plumbed after the TB, then even on a boosted application, the manifold sees high vacuum since the TB is closed and the engine is still trying to suck in air. But that's just a guess. Assuming that the setup is standard: turbo -> throttle body -> intake manifold.
__________________
Winona, My Wingless Angel Edelbrock SC w/ Flex Fuel - 18x9.5 Titan 7 wheels w/ 265/35x18 Michelin PS4S - Radium Dual Catch Cans - Verus Aero - OEM Brembos - Prototype HVT 6100e Dynamic Dampening Coilovers - JDL 4-2-1 EL / OP / Dual Catted FP w/ Greddy SP Supreme Catback |
05-11-2022, 02:06 PM | #22 | |
Join Date: Apr 2021
Drives: BRZ
Location: Virginia
Posts: 568
Thanks: 89
Thanked 711 Times in 325 Posts
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
|
Quote:
They do the same thing as before being boosted. None of the older boosted cars have vacuum pumps. No STi does. You have to do some pretty odd things (even beyond 'normal' track use) in order for it to cause an issue. |
|
05-11-2022, 02:08 PM | #23 |
Join Date: Apr 2021
Drives: BRZ
Location: Virginia
Posts: 568
Thanks: 89
Thanked 711 Times in 325 Posts
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
|
If you really want a vacuum source, you might be able to retrofit the vac pump from a 2022. They all have a vacuum pump. Same with the newer FA20/24 WRX.
|
05-11-2022, 02:13 PM | #24 | |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,286 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
Quote:
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
|
05-11-2022, 02:24 PM | #25 |
30 minute maintenance
Join Date: Oct 2020
Drives: My18 wrxsti My19 brzts
Location: Botany Bay
Posts: 1,151
Thanks: 746
Thanked 1,195 Times in 614 Posts
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
|
A M/T sees multiple vacuum spikes on acceleration through the gears, an A/T doesn`t see any.
__________________
Wait until my Flex capacitor hits 88
|
The Following 2 Users Say Thank You to gen3v8 For This Useful Post: | RedReplicant (05-11-2022), Ultramaroon (05-11-2022) |
05-11-2022, 04:05 PM | #26 |
chicken tonight
Join Date: Sep 2014
Drives: a 13 e8h frs
Location: vantucky, wa
Posts: 31,952
Thanks: 52,307
Thanked 36,619 Times in 18,982 Posts
Mentioned: 1109 Post(s)
Tagged: 9 Thread(s)
|
I only flat-foot shift. Besides, brakes are for losers.
__________________
|
The Following User Says Thank You to Ultramaroon For This Useful Post: | gen3v8 (05-11-2022) |
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Plastic Vacuum Tube for Perrin Inlet Tube | sebastiansim | Engine, Exhaust, Transmission | 5 | 05-04-2018 08:29 PM |
2013 intake manifold vs 2017 Aluminium intake manifold | Bobster | Engine, Exhaust, Transmission | 29 | 12-19-2016 10:40 AM |
wtb: sound tube delete inlet tube | Jimmy817 | Engine, Exhaust, Bolt-Ons | 1 | 12-21-2014 09:15 AM |
'Induction Roar Manifold Tube' | White64Goat | BRZ First-Gen (2012+) -- General Topics | 1 | 04-28-2013 06:51 PM |