I read J&H's article about BOV's and how running an aftermarket one strictly for sound makes the car run rich. If that is the case, then why do people still do it? Is there another way for them to get that "cool" sound without having it run rich/lean?
I am only hosting the article on my Site.
I did not write it.
MAF/AFM system measures air as it comes into the system so "venting" any of it messes up the air/fuel ratio as the ECU thinks there is more air in there than there really is.
A MAP (manifold air pressure) system takes into account the pressure in the intake manifold and the temperature of the air to figure out the volumn of air. Since this all happens after the BOV/BPV in the manifold, you can much more safely vent the valves to atmosphere.
2 BAR and 3 BAR just describes the maximum amount of pressure the sensor can read.
2 BAR can read up to 29 psi of boost and a 3 BAR can read up to 43.5 psi of boost.
so let's say i wanted my wastegate to dump into the atmosphere...on a stock 1992 Turbo, what would i need?...i know i'd need a modified downpipe...but in terms of electronics, what else?
Wastegate?! .... we are talking about BOVs/BPVS in here. Wastegates are on the other end of the entire system. At any rate, you will not need any electronics to vent the wastegate to atmosphere.
I do now, but a couple of years ago when i was just learning about turbo's cuz I bought this '91, I was duped by marketing ploys. Little did I know that the OEM bypass valve out performs all these aftermarket BOV's. I didn't know it was gonna make that noise. The first time i drove it, I freaked out and thought i didn't see a diesel truck or something and was gonna get T-boned.live and learn. I wish I was a member of this site before I bought and installed it...oh well, I think mine is starting to show signs of failure, in which case I will remove it and put my OEM one back-for good...
I am only hosting the article on my Site.
I did not write it.
MAF/AFM system measures air as it comes into the system so "venting" any of it messes up the air/fuel ratio as the ECU thinks there is more air in there than there really is.
A MAP (manifold air pressure) system takes into account the pressure in the intake manifold and the temperature of the air to figure out the volumn of air. Since this all happens after the BOV/BPV in the manifold, you can much more safely vent the valves to atmosphere.
2 BAR and 3 BAR just describes the maximum amount of pressure the sensor can read.
2 BAR can read up to 29 psi of boost and a 3 BAR can read up to 43.5 psi of boost.
so how come my car, with the Turbo XS Type H RFL, one of the loudest and highest flowing, runs absolutely perfect, and i still have my afm at this point in time, cause the vpc isn't in my posession yet?
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complete JDM Gen 2 engine, Tubular stainless manifold and 3" downpipe, Turbo XS Type H RFL blow-off-valve, Konig Holes 17" rims, Faze Boost Gauge, soon: HKS Vein Pressure Converter & Fuel Cut Defender, KYB AGX Struts, RS*R RACE Springs
so how come my car, with the Turbo XS Type H RFL, one of the loudest and highest flowing, runs absolutely perfect, and i still have my afm at this point in time, cause the vpc isn't in my posession yet?
I don't think he means it runs rich all the time but when the BOV bypasses the air to atmosphere is when you get the rich mix for a moment. in racing, i would think you would want to avoid that.
I have the same BOV as you. and my car runs fine too. sometimes between gears when I let up on the gas to shift, I get the occassional backfire, indicating a rich mix and unspent fuel .I'm not sure , but I think mine may be starting to fail. I'm keeping an eye on it.
When you let off the gas, and the BOV sounds, is the only time you're running rich.
The rest of the time, you won't notice a difference, except for the fact you've lost the by-pass characteristic of the stock BPV. If you go hard through the gears, you'll notice the difference. If the mix gets rich enough, you'll get some backfire, and might even shoot some flames out the back of your exhaust.
I should also mention that isn't a good thing.
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"It's hard to drive at your limit, but it's harder to know where it is." -Sterling Moss
so how come my car, with the Turbo XS Type H RFL, one of the loudest and highest flowing, runs absolutely perfect, and i still have my afm at this point in time, cause the vpc isn't in my posession yet?
I will not bother wasting my time answering your inquiry (or any of your other posts, comments or questions) since I could only expect this caliber of a response from you:
Quote:
Originally Posted by 91RED3S
dont be a damn child
I rather spend my time answering questions for people who are sincerely interested in modifying their MR2s safely and to run as best as possible.
The rest of the time, you won't notice a difference ...
Actually you will. A majoriy of aftermarket BOVs are based on spring tension.
If you have the spring adjusted too tightly it will not respond well at lower boost levels.
If you have the spring adjusted too loosely it will open under higher boost levels.
With enough boost pressure, the spring-based valves will always fail.
The OEM valve responds equally well regardless of the boost pressure.
The more boost you run, the tighter it holds.
The fact is, there is no benefit to going to an aftermarket valve.
You are spending money on noise at the expense of performance.
Actually you will. A majoriy of aftermarket BOVs are based on spring tension.
If you have the spring adjusted too tightly it will not respond well at lower boost levels.
If you have the spring adjusted too loosely it will open under higher boost levels.
With enough boost pressure, the spring-based valves will always fail.
The OEM valve responds equally well regardless of the boost pressure.
The more boost you run, the tighter it holds.
The fact is, there is no benefit to going to an aftermarket valve.
You are spending money on noise at the expense of performance.
is it possible that it could be opening when not boosting? I'm getting a little bogging. My first thoght was ignition, but new wires, plugs(NGK's @.028,) cap and rotor). so I started looking for a boost leak, haven't found any. i'm wondering about the BOV now. what do you think Doc?
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