"boost saver" - silly idea or invention of the century? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-14-2010, 01:50 AM   #21
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Old 06-14-2010, 01:54 AM   #22
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Old 06-14-2010, 08:41 AM   #23
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If you really want to combat the loss of boost and spool time during shifts start looking into a pre-turbo throttle body.
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Old 06-14-2010, 09:09 AM   #24
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the modern 'bypass valve' maintains your air momentum by allowing air to continuously move from the turbocharger to the throttle body under closed throttle.

I don't understand the problem you're trying to solve
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Old 06-14-2010, 09:56 AM   #25
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is OP Hyper?
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Old 06-14-2010, 10:06 AM   #26
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Ouch, that's gonna leave a mark.
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Old 06-14-2010, 04:57 PM   #27
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Quote:
Originally Posted by Sparetire View Post
Kelvin, which is whatever it is in F plus 460.
NO
and NO
cool story bro

Last edited by tasty danish; 06-14-2010 at 05:41 PM.
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Old 06-14-2010, 11:58 PM   #28
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Quote:
Originally Posted by tasty danish View Post
NO
and NO
cool story bro
Yep, I was thinking of 273 and celsius. Its not a linear translation. 70F is roughly 294K when one actually does it right. So the volume just went down a good bit. The idea still wont really work.

For one thing, when you open the valve, like Sav said, your flow rate out of the storage tank will drop really fast. So in the first instant you might get 10psig from it, but that will drop off rapidly. Within a few tenths it will be spent.

The idea must die now.
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Old 06-15-2010, 10:34 AM   #29
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consider it dead and buried
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Old 06-15-2010, 10:50 AM   #30
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Flat-****...or, even cooler: Anti-Lag...problem solved.
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Old 06-17-2010, 05:30 PM   #31
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Solution: Nawz and several v-tacks.
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Old 06-22-2010, 01:02 PM   #32
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**** it, why not put a damn turbine and on your wastegate dump tube and use it to power an air compressor which discharges in the intake tract at WOT for when manifold pressure is below your target boost level? Driveability be damned I think this is more like what you are thinking about right?
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Old 06-22-2010, 01:28 PM   #33
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Old 06-29-2010, 11:54 PM   #34
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Quote:
Originally Posted by ctxspy View Post
electric supercharger

my idea isn't to feed the compressed air back to the turbo, it's to make it available to the engine immediately when you get back on the gas while the turbo spools.

it was just a thought, i'll stfu and gbtw now
There actually was a semi-viable electric supercharger about 10 years ago. It used an Roots type blower and was attached to what looked like a starter motor and used a capacitor to deliver the power iirc. It was only good for 15 or so seconds of boost so it was kind of like a push to pass system. No idea where that crap went.
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Old 06-30-2010, 12:31 AM   #35
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Quote:
Originally Posted by firedog25 View Post
There actually was a semi-viable electric supercharger about 10 years ago. It used an Roots type blower and was attached to what looked like a starter motor and used a capacitor to deliver the power iirc. It was only good for 15 or so seconds of boost so it was kind of like a push to pass system. No idea where that crap went.
Thomas Knight Turbos.
******* garbage, http://www.boosthead.com/product.php
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Old 07-11-2010, 10:59 AM   #36
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You don't need all the gas law stuff to figure this out....

1) Let's say it is a 2 liter engine running 3000 RPM at wide open throttle. That's 50 RPS. Being a 4-stroke, it is only taking air every other revolution. So that's 50/2 cycles/sec * 2 liters/cycle = 50 liters/sec for wide open throttle at 3000 RPM.

2) Let's say you run 10 psi of boost and want your "boost saver" to provide boost starting 10 psi and depleting down to 5 psi over 0.5 seconds. Example: a) Have 10 psi 'on tap', b) start routing from "boost saver" to throttle, c) pressure drops as "boost save" is depleted such that "saved boost" is down to 5 psi after 1/2 second when, presumably, d) turbo has spun up enough to make 5 psi of boost and is building toward 10 psi.

3) That's about 25 psi absolute down to 20 psi absolute pressure, i.e. 1/5th reduction. So now we can calculate the size of "boost saver" we'll need.

4) 5 * 50 liters/sec * .5 sec = 125 liters or approximately 30 gallons.
You can play with RPMs and displacements, but the above tells you what matters.... You'd need to replace the pax seat with a 25 or 30 gallon pressure vessel and associated air plumbing. Not very practical even if it was safe.

M.
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Old 07-11-2010, 11:16 AM   #37
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Ban
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Old 07-11-2010, 02:02 PM   #38
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Haters gonna hate.
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Old 07-11-2010, 02:08 PM   #39
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You're gonna blow the welds on your intake manifold!!
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Old 07-11-2010, 03:02 PM   #40
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Quote:
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You're gonna blow the welds on your intake manifold!!
Only if Flipside Customs built it.
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