North American Turbocoupe Organization



Can we talk blow off valves..bypass valves..?
ianbfromct Offline
Senior Member
#1
Ordered my Intercooler pipes and dont have any flanges for a blow off valve or bypass valve.

I know you don't HAVE to run one. However for science and rice I wouldn't mind running one. My buddy runs a Volvo FMIC on his 2.3 with no extra valves and it appears okay.

Would I be doing any harm not running one? I wouldn't mind having Tial.
88 5 speed TC
-3" DP,lowered, 255 Walbro, Gillis valve, Cobra R's, bondo/rust, Stinger's PIMP Ecu
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margood Offline
Junior Member
#2
Its my opinion that when available, a BOV is always preferred. There is debate on the benefits of recirculating vs. vent to atmo, but its really your preference on that one. Definitely do your homework to figure out what best for you. Then again, you don't HAVE to run a BOV, the stock TC doesn't.
87 TC Not bone stock anymore, no rust, sittin' pretty, always trying to get it running...
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Not B Anymore Offline
Administrator
#3
It's the extra intake path length, when running a front mount, that makes a BOV/BPV a very good idea. Not running one will shorten the life if your turbo. All that air has to go somewhere when the throttle plate closes and back through the turbo is not ideal, to say the least.

As far as which type. As margood stated, it boils down to preference, especially since you are running a Pimp.

If you get a BOV with a regular hose connection, you can get a straight silicone coupler from various places that has a 't' for attaching it. I think the one I have came from treadstone.
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels
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turbo_crazy Offline
Senior Member
#4
Some people end up with a bucking issue when shifting, some don't. I know I did, but I was running an external wastegate. Threw on a tial knock-off BOV and the issue went away completely
87 TC: 5spd, started B234F head swap (overall setup changing), Quarterhorse, T3/T4 63 a/r, 3" exhaust, walbro 255, tubular front clip, 5 lug swap, 17x8 front/17x9 rear cobra r's, wilwood 4 piston calipers (rear only, for now), lightened 471lbs so far
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Dingus00 Offline
Junior Member
#5
BOV or Bypass is better then spinning the turbo backwards(lost my stock IHI to that). Bypass is better for fuel economy and spark plugs over time, but a BOV sounds so much cooler!
2.3 or bust!
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boosted chicken Offline
Senior Member
#6
Absolutely put a BOV on it! You need one with a FMIC and all of the additional piping. Two years ago, my aftermarket BOV stopped working. I was lazy and didn't bother to replace it. Fast forward about 4 months. I was running the boost up and when I lifted, the gas pedal dropped to the floor and the engine went down to idle. Turns out the backfeeding from not having a working BOV weakened and finally broke the throttle shaft in the TB. Of course when that happened, one of the screws holding the throttle blade on the shaft got sucked into the engine, beat the crap out of #3 piston, damaged the exhaust seat on that cylinder and destroyed the turbine wheel on my $900 Precision turbo.
Very expensive lesson. I replaced the turbo, fixed the head and piston and you better believe I put a new BOV on it.
Now when I am running the car hard, I listen carefully making sure the BOV is doing it's job.
88 TC#1 Boport stg 3 alum dport head, PT6466, Boport header, CP pistons, Crower rods, MS2xtra
88 TC#2 drag car project(someday)
88 TC#3 parts car (just needed the header panel...bought the whole car, lol)
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