why the atmospheric BOV all the time?
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cuz its shoots uber flames y0 !
lol yea , i mean its not really too bad with an afc2 or something that has throttle shit fuel control , so you can lean out teh mixture when the throttle shuts
lol yea , i mean its not really too bad with an afc2 or something that has throttle shit fuel control , so you can lean out teh mixture when the throttle shuts
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H22Prelude = My Sex Slave
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Originally posted by SupraKid
and I will say it again.. a BLOW OFF Valve does nothing for performance. I see nothing good about running rich between shifts.
and I will say it again.. a BLOW OFF Valve does nothing for performance. I see nothing good about running rich between shifts.
Upgrading from a stock BOV also increases your performance, because stock BOV's will tend to leak at a certain amount of boost, by replacing it with a stronger one, you can increase your boost, which makes you faster, which is a PERFORMANCE GAIN.
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I own H22Prelude and her body
1989 Toyota Supra Twin Turbo -FOR SALE!!
-1JZGTE motor, Greddy profec B, HKS BOV, autometer gauges, 3" Blitz Nur Spec R Exhaust, MkIV Rims, Yokohama A032R tires . FOR SALE!!! PM ME!!
1997 Mitsubishi Eclipse GST
Mods: AGP L2R, victoy performance 2.5" O2 housing with 40mm External wastegate, Denso 660's, IRC Race FMIC, 2.5" intercooler piping, 3" dejontool intake, BBK 255lph fuel pump, Blitz Dual turbo timer, Greddy profec B, Stillen 3" downpipe , 3" Tanabe Racing Medallion exhaust, Greddy type S BOV, Apexi EL EGT, Apexi EL Boost Gauge, translab shift kit, alto end clutch, Eibach pro kit, tokico illumina shocks, HKS 264/272 cams, 1G head swap, RRE SS valves, crower titanium retainers, crower valvesprings, mitsu 3 layer metal headgasket, DSMlink, ARP rod bolts, ARP head studs, Aeromotive AFPR with stainless braided lines and B&M gauge, stainless oil feed line with inline filter, gay vitek plug wires, RRE catch can, thin fans, and much more.
I own H22Prelude and her body
1989 Toyota Supra Twin Turbo -FOR SALE!!
-1JZGTE motor, Greddy profec B, HKS BOV, autometer gauges, 3" Blitz Nur Spec R Exhaust, MkIV Rims, Yokohama A032R tires . FOR SALE!!! PM ME!!
1997 Mitsubishi Eclipse GST
Mods: AGP L2R, victoy performance 2.5" O2 housing with 40mm External wastegate, Denso 660's, IRC Race FMIC, 2.5" intercooler piping, 3" dejontool intake, BBK 255lph fuel pump, Blitz Dual turbo timer, Greddy profec B, Stillen 3" downpipe , 3" Tanabe Racing Medallion exhaust, Greddy type S BOV, Apexi EL EGT, Apexi EL Boost Gauge, translab shift kit, alto end clutch, Eibach pro kit, tokico illumina shocks, HKS 264/272 cams, 1G head swap, RRE SS valves, crower titanium retainers, crower valvesprings, mitsu 3 layer metal headgasket, DSMlink, ARP rod bolts, ARP head studs, Aeromotive AFPR with stainless braided lines and B&M gauge, stainless oil feed line with inline filter, gay vitek plug wires, RRE catch can, thin fans, and much more.
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Originally posted by 89TwinTurboSupra
yes it does, if you have no blow off valve you experience compression surge, which will not alllow you to run any decent amount of boost, and which will damabge your turbo. Therefore it does help your performance.
Upgrading from a stock BOV also increases your performance, because stock BOV's will tend to leak at a certain amount of boost, by replacing it with a stronger one, you can increase your boost, which makes you faster, which is a PERFORMANCE GAIN.
yes it does, if you have no blow off valve you experience compression surge, which will not alllow you to run any decent amount of boost, and which will damabge your turbo. Therefore it does help your performance.
Upgrading from a stock BOV also increases your performance, because stock BOV's will tend to leak at a certain amount of boost, by replacing it with a stronger one, you can increase your boost, which makes you faster, which is a PERFORMANCE GAIN.
They make electronics to compensate for running rich between shifts, one of them being EIDS by HKS on the Super AFR.
Additionally, an Electronic Idle Stabilizer function (EIDS) function, which buffers the dramatic airflow meter signal fluctuations, prevents the engine stalling or stumbling effect associated with the sudden imbalances in the air/fuel ratio of airflow meter-equipped vehicles that utilize discharge blow-off valves that vent to the atmosphere.
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Originally posted by 89TwinTurboSupra
yes it does, if you have no blow off valve you experience compression surge, which will not alllow you to run any decent amount of boost, and which will damabge your turbo. Therefore it does help your performance.
Upgrading from a stock BOV also increases your performance, because stock BOV's will tend to leak at a certain amount of boost, by replacing it with a stronger one, you can increase your boost, which makes you faster, which is a PERFORMANCE GAIN.
yes it does, if you have no blow off valve you experience compression surge, which will not alllow you to run any decent amount of boost, and which will damabge your turbo. Therefore it does help your performance.
Upgrading from a stock BOV also increases your performance, because stock BOV's will tend to leak at a certain amount of boost, by replacing it with a stronger one, you can increase your boost, which makes you faster, which is a PERFORMANCE GAIN.
Read up:
http://jekylandhyde.madpowaz.com/bov.htm
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Originally posted by SupraKid
You will NEVER find a PERFORMANCE gain from ANY BOV..... if you ever do please let all of us know....
Read up:
http://jekylandhyde.madpowaz.com/bov.htm
You will NEVER find a PERFORMANCE gain from ANY BOV..... if you ever do please let all of us know....
Read up:
http://jekylandhyde.madpowaz.com/bov.htm
Take a fictional DSM running 26psi on a 50 trim t3/t4. Would his stock bov be sufficient? No. It would leak boost. So therefore an upgraded BOV would make a performance increase.
THE HAMMER
Joined: May 2002
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you will not make any more POWER in the form of HP from a BOV..
HOWEVER.. When you shift gears in a car without a bov or bypass valve (take for example my old 1988 300zx turbo) the turbine is first going forewards creating 14 lbs boost... then you close the throttle and put in the clutch...
All this air stopps and rushes back towards the turbine, hits it, and spins it many thousands of rpm in the WRONG DIRECTION!!!
Then when you get back on the gas, your motor has to take the time to push the turbine back in the RIGHT direction before the turbo can produce boost again.....
with a bov, all this air goes into the atmosphere, and the turbo continues to turn in the INTENDED direction, not having to take the time to REVERSE and then go forewards again...
The performance boost in a bov comes with the response of a turbo after the shift, with a bov or bypass valve, you will return to boost in a much shorter time after the shift....
This also goes for times when you let off the throttle and are not shifting......................
Power returns FASTER because the turbine does not have to accelerate to its boosting rpm's again..... (or return from reversed RPM's in the case of NO bov or bypass valve)
HOWEVER.. When you shift gears in a car without a bov or bypass valve (take for example my old 1988 300zx turbo) the turbine is first going forewards creating 14 lbs boost... then you close the throttle and put in the clutch...
All this air stopps and rushes back towards the turbine, hits it, and spins it many thousands of rpm in the WRONG DIRECTION!!!
Then when you get back on the gas, your motor has to take the time to push the turbine back in the RIGHT direction before the turbo can produce boost again.....
with a bov, all this air goes into the atmosphere, and the turbo continues to turn in the INTENDED direction, not having to take the time to REVERSE and then go forewards again...
The performance boost in a bov comes with the response of a turbo after the shift, with a bov or bypass valve, you will return to boost in a much shorter time after the shift....
This also goes for times when you let off the throttle and are not shifting......................
Power returns FASTER because the turbine does not have to accelerate to its boosting rpm's again..... (or return from reversed RPM's in the case of NO bov or bypass valve)
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H22Prelude = My Sex Slave
Joined: Dec 2003
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I guess my definition of performance gain is different.........
See if I had a stock BOV on my eclipse, it would be able to boost past 12psi......
But with a greddy type S, I can boost 20+...........
so even tho the BOV itself doesnt give me HP, it allows more HP, therefore I would call it a PERFORMANCE GAIN.
See if I had a stock BOV on my eclipse, it would be able to boost past 12psi......
But with a greddy type S, I can boost 20+...........
so even tho the BOV itself doesnt give me HP, it allows more HP, therefore I would call it a PERFORMANCE GAIN.
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I own H22Prelude and her body
1989 Toyota Supra Twin Turbo -FOR SALE!!
-1JZGTE motor, Greddy profec B, HKS BOV, autometer gauges, 3" Blitz Nur Spec R Exhaust, MkIV Rims, Yokohama A032R tires . FOR SALE!!! PM ME!!
1997 Mitsubishi Eclipse GST
Mods: AGP L2R, victoy performance 2.5" O2 housing with 40mm External wastegate, Denso 660's, IRC Race FMIC, 2.5" intercooler piping, 3" dejontool intake, BBK 255lph fuel pump, Blitz Dual turbo timer, Greddy profec B, Stillen 3" downpipe , 3" Tanabe Racing Medallion exhaust, Greddy type S BOV, Apexi EL EGT, Apexi EL Boost Gauge, translab shift kit, alto end clutch, Eibach pro kit, tokico illumina shocks, HKS 264/272 cams, 1G head swap, RRE SS valves, crower titanium retainers, crower valvesprings, mitsu 3 layer metal headgasket, DSMlink, ARP rod bolts, ARP head studs, Aeromotive AFPR with stainless braided lines and B&M gauge, stainless oil feed line with inline filter, gay vitek plug wires, RRE catch can, thin fans, and much more.
I own H22Prelude and her body
1989 Toyota Supra Twin Turbo -FOR SALE!!
-1JZGTE motor, Greddy profec B, HKS BOV, autometer gauges, 3" Blitz Nur Spec R Exhaust, MkIV Rims, Yokohama A032R tires . FOR SALE!!! PM ME!!
1997 Mitsubishi Eclipse GST
Mods: AGP L2R, victoy performance 2.5" O2 housing with 40mm External wastegate, Denso 660's, IRC Race FMIC, 2.5" intercooler piping, 3" dejontool intake, BBK 255lph fuel pump, Blitz Dual turbo timer, Greddy profec B, Stillen 3" downpipe , 3" Tanabe Racing Medallion exhaust, Greddy type S BOV, Apexi EL EGT, Apexi EL Boost Gauge, translab shift kit, alto end clutch, Eibach pro kit, tokico illumina shocks, HKS 264/272 cams, 1G head swap, RRE SS valves, crower titanium retainers, crower valvesprings, mitsu 3 layer metal headgasket, DSMlink, ARP rod bolts, ARP head studs, Aeromotive AFPR with stainless braided lines and B&M gauge, stainless oil feed line with inline filter, gay vitek plug wires, RRE catch can, thin fans, and much more.
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http://jekylandhyde.madpowaz.com/bov.htm read up, like I told you 
but if you consider it a performance gain... more power to you.
but if you consider it a performance gain... more power to you.
THE HAMMER
Joined: May 2002
Posts: 5,184
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i highly doubt that hes tested a stock bypass valve successfully showing that it has a gain on a dyno over an aftermarket..
When he talks about the bov not opening under anything but WOT.. he forgets that u can adjust the springs on bov's (most of them) and get around that.....
He also forgets to mention that the stock mr2 bypass valve is made of plastic materials, and can decide to come apart under higher boost....
I very much doubt that besides the sound that there is any performance difference at all during daily driving at stock boost levels....
How do i know this? I drove MR2 moogies mr2 around plenty before and after putting the recirculating Type H from turbo XS on his car.. both vented and recirc'd... i didnt notice any "loss of power", so even if it was there it might be 1hp.....
I dunno, personally to me metal > plastic stuff..
When he talks about the bov not opening under anything but WOT.. he forgets that u can adjust the springs on bov's (most of them) and get around that.....
He also forgets to mention that the stock mr2 bypass valve is made of plastic materials, and can decide to come apart under higher boost....
I very much doubt that besides the sound that there is any performance difference at all during daily driving at stock boost levels....
How do i know this? I drove MR2 moogies mr2 around plenty before and after putting the recirculating Type H from turbo XS on his car.. both vented and recirc'd... i didnt notice any "loss of power", so even if it was there it might be 1hp.....
I dunno, personally to me metal > plastic stuff..
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Last edited by Slash; Dec 22, 2003 at 01:41 AM.
