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Old 04-05-2012, 09:28 PM   #18
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Last I checked, the 14psi made by one turbo is the same 14psi made by any other turbo. It's 14psi no matter how you spin it. Now what matters is your air to fuel mix and what kinda bottom end you are running. I've seen the mazda 2.3 boosted up pretty high in previous models and they don't really have much trouble with the motor. The trans and cv shafts tend to shatter under excessive wheel hop but not generally the motor.


Volume.
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Old 04-05-2012, 09:35 PM   #19
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Volume.
The turbo can only push as much air as the ducting would allow it to. The tubing in the Mazda is gonna be the determining factor here, not the turbo. And besides the duct work, the motor has a maximum flow that is also gonna limit the amount of volume that the engine can even use. That's where the waste gate comes in. It dumps the excess to the atmosphere. Poorly selected and tuned waste gates can blow engines actually more often than big turbos do. I don't see much issue with the car running on 24 psi of boost. If a non-forged Honda 1.6/1.8 can run over 35psi, I wouldnt worry too much about 24 in a larger, forged motor...
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Old 04-05-2012, 09:45 PM   #20
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they are bad about blocks not holding up, email cobb
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Old 04-05-2012, 09:52 PM   #21
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The OP claims that he runs it daily. The question is how long it will hold at that pressure. I'm sure most motors can hit 50psi but for how many seconds? I highly doubt the OP's friend will have any issues with ducting especially with the way that it sounds it it's modded. The wastegate is moreso to regulate the amount of pressure built by the tubo so that you can prevent overboosting. Technically, the higher the PSI the more air you can cram into the cylinder regardless of how much the engine flows. There will always more air per cubic inch in relation to PSI.
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Old 04-06-2012, 12:40 PM   #22
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The OP claims that he runs it daily. The question is how long it will hold at that pressure. I'm sure most motors can hit 50psi but for how many seconds? I highly doubt the OP's friend will have any issues with ducting especially with the way that it sounds it it's modded. The wastegate is moreso to regulate the amount of pressure built by the tubo so that you can prevent overboosting. Technically, the higher the PSI the more air you can cram into the cylinder regardless of how much the engine flows. There will always more air per cubic inch in relation to PSI.
Yes but there is a point where flow is gonna hinder the amount of air you can cram into the engine. I've been out of the turbo game for awhile but eventually every engine hits the wall.
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Old 04-12-2012, 12:02 PM   #23
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Old 04-12-2012, 12:12 PM   #24
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congrats! I guess? kind of messed up waiting for him to blow up his stuff, even if he drives a mazda.
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Old 04-12-2012, 01:06 PM   #25
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Originally Posted by Coyotekiller View Post
The turbo can only push as much air as the ducting would allow it to. The tubing in the Mazda is gonna be the determining factor here, not the turbo. And besides the duct work, the motor has a maximum flow that is also gonna limit the amount of volume that the engine can even use. That's where the waste gate comes in. It dumps the excess to the atmosphere. Poorly selected and tuned waste gates can blow engines actually more often than big turbos do. I don't see much issue with the car running on 24 psi of boost. If a non-forged Honda 1.6/1.8 can run over 35psi, I wouldnt worry too much about 24 in a larger, forged motor...
This is somewhat accurate, but misleading at the same time. Hot or cold side piping c an be a bottleneck, but a more efficient turbo will always be able to push more volume through the same ducting as a less efficient one. More efficient turbos increase charge air temperatures over ambient far less than smaller, less efficient turbos and thus will flow the same volume at lower boost pressures. With a proper intercooler, the right tune, and a reciprocating assembly that can handle the force, 28-30psi on a 3076r can be fine. As far as reaching "maximum flow" for the engine. . . that's a bit of a stretch for this example, he is most definitely limited by the strength of his motor, not the displacement. I have seen 2.0l I4s making over 600awhp in daily driven street cars and 500+ in 2.5l on multiple occasions. The wastegate bleeds excess exhaust to regulate boost in the turbo, it does not bleed intake air.
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Old 04-12-2012, 01:46 PM   #26
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Lets hope he just turned up the boost for the strip.

no need to be driving around town at 24... 14 is pushing it on cast block, with no forged internals.
A cast block? Do you mean an aluminum block?
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Old 04-12-2012, 01:51 PM   #27
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This is somewhat accurate, but misleading at the same time. Hot or cold side piping c an be a bottleneck, but a more efficient turbo will always be able to push more volume through the same ducting as a less efficient one. More efficient turbos increase charge air temperatures over ambient far less than smaller, less efficient turbos and thus will flow the same volume at lower boost pressures. With a proper intercooler, the right tune, and a reciprocating assembly that can handle the force, 28-30psi on a 3076r can be fine. As far as reaching "maximum flow" for the engine. . . that's a bit of a stretch for this example, he is most definitely limited by the strength of his motor, not the displacement. I have seen 2.0l I4s making over 600awhp in daily driven street cars and 500+ in 2.5l on multiple occasions. The wastegate bleeds excess exhaust to regulate boost in the turbo, it does not bleed intake air.
You need a Mitsubishi to run that kind of power reliably. In England they sell a stock-internal Evo X w/ 400 hp and a warranty. Just some bolt-ons and a tune.
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Old 04-12-2012, 02:05 PM   #28
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You need a Mitsubishi to run that kind of power reliably. In England they sell a stock-internal Evo X w/ 400 hp and a warranty. Just some bolt-ons and a tune.
I hope you are joking... Unless the 4G63 has been drastically change since 5 years ago...
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Old 04-12-2012, 02:16 PM   #29
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You need a Mitsubishi to run that kind of power reliably. In England they sell a stock-internal Evo X w/ 400 hp and a warranty. Just some bolt-ons and a tune.

yeah, but those are imperial horses...
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Old 04-12-2012, 02:27 PM   #30
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I hope you are joking... Unless the 4G63 has been drastically change since 5 years ago...
Evo's haven't run 4g63's since 2007...so yeah they have.

Nobody has heard of the Evo X FQ400? It's a real car that really makes over 400 bhp.
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Old 04-12-2012, 02:29 PM   #31
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guy's trapping a good speed on that car.

For the most part though.. your mods in your sig are bolt on light-duty mods only.. and time wise. you're still beating him on the clock.

You do some internals work you could smoke him and still be n/a. According to TSP some of their VVT series cams can pick up 100whp and thats on an L99.. LS3 can probably do better for you.

The mazdaspeed3 isn't anything to laugh at though, direct injection 2.x liter motor, its only problem is that it's fwd and rides like a 2 horse buggy.
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Old 04-12-2012, 02:38 PM   #32
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well i give it two months before he blows it up lol, he is running 24lbs of boost on the stock block with a monster turbo
There's a guy here in town with a very similar build that is just hounding me to race...

About a month ago we spoke he's been through 3 clutches and one tranny.

I talked to him about a week ago and he had blown the motor....

:(

He did say it was a matter of time... he's rebuilding now and gonna run closer to 15 lbs of boost. he thinks that will be pretty durable.
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