Blow off Valves

2.5RHDsupra · 06-09-2010, 12:05 AM

I got an Automatic supra, is there a good reason to put blow off valves on it, what benefits would i be getting from installing them.

btwilson86 · 06-09-2010, 04:00 AM

BOV and BPV protect against compressor surge as the throttle plate is closed. With an auto, the throttle plate is typically closed less frequently than with a std transmission. However, there are still times that the driver may close the throttle plate abruptly while building boost. This scenario would benefit from having a BOV or BPV installed (correctly) on the vehicle.

2.5RHDsupra · 06-09-2010, 04:38 AM

Ok so what do you think is a good price for a blow off valve?

btwilson86 · 06-09-2010, 07:31 AM

Haha.... THAT I am not sure of. I didn't have a turbo car long enough to start looking for replacement ones. IMO, a "good price" is relative to the purchaser. If you think it's a good price for what you're looking for in a BOV, type the part number into your search engine and see what people are selling one for. I am sure you'll find a deal you can't pass up.

The following is a short list of a few things to look for in a BOV:

Get a piston type valve, they are not as likely to bleed as you build boost. Less bleeding=quicker acceleration/more power, plus the "Whooosssssssh" sound is much more pronounced.

BUY NAME BRAND! Alot of the cheaper "replica" valves have springs that are too tight or too weak, leading to a late release (more compressor surge) or early release (top end boost leak).

Read the reviews, ask questions. If it's a decent BOV, people will have already tried it. See what they thought. Also, a good BOV will usually have a good company behind it. Look at the specs, talk to the sales reps. Find out what makes that one better than the rest.

06-09-2010, 12:05 AM	#1
2.5RHDsupra Intake Join Date: Mar 2010 Location: calgary Posts: 40	Blow off Valves I got an Automatic supra, is there a good reason to put blow off valves on it, what benefits would i be getting from installing them.

06-09-2010, 04:00 AM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	BOV and BPV protect against compressor surge as the throttle plate is closed. With an auto, the throttle plate is typically closed less frequently than with a std transmission. However, there are still times that the driver may close the throttle plate abruptly while building boost. This scenario would benefit from having a BOV or BPV installed (correctly) on the vehicle. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

06-09-2010, 07:31 AM	#4
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Haha.... THAT I am not sure of. I didn't have a turbo car long enough to start looking for replacement ones. IMO, a "good price" is relative to the purchaser. If you think it's a good price for what you're looking for in a BOV, type the part number into your search engine and see what people are selling one for. I am sure you'll find a deal you can't pass up. The following is a short list of a few things to look for in a BOV: Get a piston type valve, they are not as likely to bleed as you build boost. Less bleeding=quicker acceleration/more power, plus the "Whooosssssssh" sound is much more pronounced. BUY NAME BRAND! Alot of the cheaper "replica" valves have springs that are too tight or too weak, leading to a late release (more compressor surge) or early release (top end boost leak). Read the reviews, ask questions. If it's a decent BOV, people will have already tried it. See what they thought. Also, a good BOV will usually have a good company behind it. Look at the specs, talk to the sales reps. Find out what makes that one better than the rest. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

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06-09-2010, 04:38 AM	#3
2.5RHDsupra Intake Join Date: Mar 2010 Location: calgary Posts: 40	Ok so what do you think is a good price for a blow off valve?