hey guys. im new to the forums and the mr2 as well so please dont flame!!
ive been looking around the forums for info about installing a bov that vents to the atmosphere and it seems like our cars have a tendency to stall out and/or run really poorly because of this?? what exactly would i have to do before i get a bov to prevent this?
thanks guys!
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1995 Integra LS [SOLD 4G's]
1991 Toyota MR-2 Turbo
Originally posted by myRice hey guys. im new to the forums and the mr2 as well so please dont flame!!
ive been looking around the forums for info about installing a bov that vents to the atmosphere and it seems like our cars have a tendency to stall out and/or run really poorly because of this?? what exactly would i have to do before i get a bov to prevent this?
thanks guys!
Get a full EMS and you will be good to go . BOV will not do anything but make noise for you.
well, today i did some thinking. the car stalls out because of the sensor on the IM, but if i were to take off the bypass valve and plug up the hole, and then bore a hole on the intake hoses and install my bov there, would it work??
i know, it probably makes no sense, but i have a method to my madness. i saw this setup on an old supra. the owner said he used to have this kind of problem as well, but that he just did that and i worked. the bov was on his intake tube and not where the bypass valve should have been. the bypass valve was gone and there were just two holes that he had plugged up.
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1995 Integra LS [SOLD 4G's]
1991 Toyota MR-2 Turbo
Since the stock computer can not measure air that has been dumped into the atmosphere, it introduces a unknown parameter into the fuel mixture calculations. This is the reason for the hesitation you will experience when rerouting the stock BOV layout.
I have an HKS Super Sequential Blow off Valve in my 92MR2. I have had no idle problems or stalling since a got it. I had the greddy type-s blow of valve before and had idle problems. Here a description of the HKS B.O.V. from a website: The Super Sequential Blow-Off Valve (SSQV) is a pull type relief valve. The SSQV is actuated by pressure alterations only, ensuring quick valve response and complete closure during idle. Typical blow-off valves utilize large valves in order to accommodate high boost/high horsepower applications. However, these larges valves react slowly and require high activation pressure to open. Smaller, fast reacting valves, do not permit the air flow required for high horsepower. The SSQV incorporates both for maximum performance. It is engineered utilizing a small primary valve and a secondary valve for additional relief capacity. The SSQV is made of billet aluminum and emits a unique aggressive sound. This is a complete bolt-on kit for your car. Hope this info helps.
well, the question was actually if it was possible to take off the oem bypass valve and plug up the holes, then make a flange on the intake tube and put the BOV there. i saw an old supra with this kind of setup and it worked great for him.
also, i heard about a way that you could mod the original bypass valve to vent to the atmosphere. has anyone tried this? how did it work out?
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1995 Integra LS [SOLD 4G's]
1991 Toyota MR-2 Turbo
To properly vent to atmosphere you will need an EMS. The stock ECU cannot make the necessary adjustments to measure the air being dumped into the atmosphere instead of the intake piping.
Now the real question... why do you want a BOV... or to vent the stock bpv to the atmosphere? Basically all it will do is make you run rich and cost you ~$300. It's kinda a lose lose setup.
I had my stock bov vented to the atmosphere when I first had my swap done cause I was missing a few things on my clip that I had to pickup... and Toyota was slacking. Basically... I instantly picked up 2lbs of boost when I got all the recirc pipes back into place on the stock boost controller. I didn't really notice the car running that rough when it was vented to the atmosphere... but I could definately tell the power difference once everything was back in place.
I think the main reason I wanna go to an HKS SSQV BOV is for the sound. My brother has one on his eclipse GS-T and it is very sweet. I realize it's not going to be to much of a performance upgrade, but people definitely won't be questioning whether or not you have a turbo under the lid.
well, i decided to try venting the OEM bypass valve to the atmosphere and so far, ive had no problems with it whatsoever! =) im satisfied with the sound very much and there are no stalling or bogging problems whatsoever. what i did was, i took off the pipe that connected the bpv to the intake tube, then i plugged up the hole on the intake tube and i made sure it was tight. then... i took it for a test drive and WHOOO. hehe. it was awesome.
so, in the future, if anyone is looking for a FREE blowoff valve, this is how to do it.
btw, i have a '91 mr-2. im not sure about the changes made in the later model years to the motor/sensors, so try this at your own risk. im not gonna assume any responsibilities for someone who tries this and blows thier motor doing it. but, with that said, HAVE FUN!
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1995 Integra LS [SOLD 4G's]
1991 Toyota MR-2 Turbo
Originally posted by ishcoleobo . and EMS costs ~$3,000 depending on what you get.
The Nemisis and the AEM are around $1300, not $3000.
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Originally posted by myRice well, the question was actually if it was possible to take off the oem bypass valve and plug up the holes, then make a flange on the intake tube and put the BOV there.
If I am understanding you correct, it sounds like you want to put the BOV before the turbo? ... the point of haivng a BOV is to vent pressurized air so it does not come back through the turbo. The BPV/BOV must be in between the turbo and the throttle body ... or it makes no sense.
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Originally posted by myRice also, i heard about a way that you could mod the original bypass valve to vent to the atmosphere.
If you have a VPC or EMS you can vent it with little affect.
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Originally posted by mkIImr2lvr I realize it's not going to be to much of a performance upgrade, but people definitely won't be questioning whether or not you have a turbo under the lid.
Most BOVs cost you performance and who cares if people know you have a turbo? Regardless, it should be clear by the sound of hte turbo spooling, not hhte BOV.
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Originally posted by myRice well, i decided to try venting the OEM bypass valve to the atmosphere and so far, ive had no problems with it whatsoever!
Consider yourself lucky that you are not having running issues.
1. You are still venting metered air, so you are running rich on throttle lift.
2. Under various circumstance youa re now leeting in unmetered, UNFILTERED air into your engine. At the least I would recommend you put a K&N filter onthe end of your BPV so you are not letting junk into your engine.
Is it really worth all of the risk to your engine and performance to have noise?
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Originally posted by mkIImr2lvr Check that out because I believe he vented his OE BPV to atmosphere with a K&N Filter on Hyde.
Correct, but I have a VPC. I am not using the AFM to measure air.
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Forum for every generation Toyota MR2. Including the AW11 and SW20.
. BOV will not do anything but make noise for you.
HKS Blow off Valve
Linear Mode
