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N/A and boost?

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Old 12-05-06, 08:43 PM
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N/A and boost?

how much boost can a s4 N/A handle?
Old 12-05-06, 09:42 PM
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how good is your tune?


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Old 12-05-06, 10:31 PM
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All N/A's run at 14.7 pounds of "boost"
Old 12-05-06, 10:56 PM
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..... No.


Boost would be pressure over ambient. So at mos tthey see about 1 psi from the VDI...


BC
Old 12-06-06, 12:19 AM
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Depends on tunning and fuel supply.. S4 n/a rotors are pretty low compression.. so you can get away pretty easy at 10psi with enough fuel and decent intercooler... there is no "max boost" the engine can handle.. it depends on tuning, air temps, fuel type.. etc.

Hope that helps.. also you will need to go stand alone as a piggy back won't be able to retard timing under boost.
Old 12-06-06, 12:29 AM
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no **** rxtuner thats atmospheric pressure @ sea level, "boost" is more than 14.7
Old 12-06-06, 12:32 AM
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Originally Posted by jvallo7
no **** rxtuner thats atmospheric pressure @ sea level
Exactly. An NA engine, by definition, runs at 0 psi over ambient.
If you are wanting to know how much you can run on a boosted NA block, then its all dependent on your setup, tune, type of gas, and the size of your cajones. Generally speaking, though, they don't run as much boost as ones built for turbos since they have higher compression.
Old 12-06-06, 01:08 AM
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Originally Posted by Sideways7
Exactly. An NA engine, by definition, runs at 0 psi over ambient.
If you are wanting to know how much you can run on a boosted NA block, then its all dependent on your setup, tune, type of gas, and the size of your cajones. Generally speaking, though, they don't run as much boost as ones built for turbos since they have higher compression.
I'm glad someone understands what an N/A engine is, 14.7 pounds...
Old 12-06-06, 01:32 AM
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I think what rx7tuner said is what most people call a joke.
a.. "joke"

jvallo, do you actually have a turboed NA or are you asking because you might want to make one?
Old 12-06-06, 07:21 PM
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im thinking of boosting my N/A i have all the parts i need to do it except the right ecu and fuel injectors but ther on the way
Old 12-06-06, 07:43 PM
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good luck...i highly doubt you've done enough research, i researched on here for a good two months, started buying stuff, and realized I still DIDNT know enough to do it. dont get into something you'll back out of. buy my supercharger kit and be done with it. but if you know a lot and wanna risk it. go for it, it'll be fun and you'll learn a lot you probably didnt know..just my .02

Aaron
Old 12-06-06, 07:45 PM
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btw do you know who Aaron Cake is?...









if not, i was right
Old 12-06-06, 07:53 PM
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bout 10psi is doable on 91-93 octane, 15-17PSI on meth/eth injection and i would guess at least 20PSI on C16.
Old 12-06-06, 09:14 PM
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Buy ExSr20kidF2's supercharger. It will be cheaper and your car will actually work when you boost it.
Old 12-06-06, 09:55 PM
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My boosted N/A pins me to the seat on pump gas and 10PSI.
I break the tires in 2nd gear from a roll.

How long it will last........hopefully awhile.
Old 12-06-06, 11:34 PM
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I'm building my 13BT w/ s4 n/a rotors and a streetport

Doing a stage 2 BNR turbo and HKS stock mount intercooler.
Maybe some water injection to help the stock mount.

Going to keep boost between 8.5-12psi
Old 12-07-06, 12:19 AM
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Originally Posted by Mankdrake 2661
My boosted N/A pins me to the seat on pump gas and 10PSI.
I break the tires in 2nd gear from a roll.

How long it will last........hopefully awhile.
The engine is either boosted (turbo, supercharger) or normally aspirated. (N/A)
It cant be both.. lol.
Old 12-07-06, 12:27 AM
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^^ that's just a 4 port with 9.4 rotors though, not a 6 port turbo...
Old 12-07-06, 12:42 AM
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I'm gonna sound like a total newbie, but i have to ask this question. I just purchased an '87 RX-7 and i don't know much about RX-7's in general, whereas, i know more about other imports. But I noticed that if i take my car up to redline when i shift i can hear a whistling/hissing sound coming from the front of the car. I can't see a turbo when i look in the engine bay, but there is a lot of crap in the way. Please help me find out if my car is n/a or turbo. Thank you.
Old 12-07-06, 12:43 AM
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and your point is?
Still the same compression.

running a standalone to make it work nicely
stock ecu is poop
Old 12-07-06, 12:47 AM
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my old automatic base made a real noisey air sound, dunno if it was the tranny or what, but ive experienced the same sort of thing in other n/a FC's.
Rotaries w/ lotsa vacuum lines and all the emissions and whatever just sound like that. Whiney.

You would know if its a turbo, intercooler sticks out like a sore thumb, the turbo is slightly hidden w/ all of the stock emissions and airbox and stuff, but the intercooler is super easy to spot. the turbo can be seen even w/ the stock BS all around
Old 12-07-06, 12:53 AM
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i think i see one, but i also think its the tranny cooler...jeez i feel dumb right now...
Old 12-07-06, 12:57 AM
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lol, nope.
Theres a power steering cooler, oil cooler, radiator.
On the autos, I forget where the tranny cooler is. Don';t know if its integrated into the radiator or what.

The intercooler is RIGHT on top of the motor, on top of the intake manifold. Says Turbo II. And has a hood scoop to match.


Just take my word that you don't have a turbo
Old 12-07-06, 01:00 AM
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You are likely hearing the air pump. When I hold my vert in 1st gear and let off the gas quickly its sounds like a weak blow off valve venting. Thats likely what you are hearing.

BC
Old 12-07-06, 01:16 AM
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Hey, thanks guys. I still feel dumb, but at least I know now. But I'm still kinda sad that its not turbo now. Now...if i want to go turbo, can i get one for my 13 b? By the way my car is a manual trans.


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