High boost after BOV 1G Upgrade

[TechyGSX]

So I don't have any UIC piping to mount a 1g BOV onto my 97 GSX, so I had to purchase one of those adapters. Now here's the thing, the rubber tube that goes around the original BOV is to big for the adapter. Well, I figured I'd just go ahead and wrap some electrical tape around the adapter until it was big enough for the rubber tubeto fit snug with it. Once I mounted it, I went out for a test drive and the my turbo was boosting like 20+ pounds at low RPMs. Could this be happening because air is escaping through the adapter? Or is my wastegate just not opening up, and I've had no idea it was doing this because the stock BOV leaks at 13 pounds which means that there's not enough pressure build up in the exhaust manifold which the wastegate would release? Which brings me to another question. If the stock BOV leaks at around 13 pounds, why is that internal wastegate needed? I mean 13 pounds isn't enough pressure that it would need to be released.

 

[TechyGSX]

After a lot of searching I figured it out. I need a MBC! I put the BCS restrictor back and I'm still spiking. Guess I'll have to do adjust the boost myself.

 

[boostedtalon]

Sounds right, not sure why it would affect boost like that though, what type of BOV did you go with? Are you venting to the atmosphere? Hows it work? Do you like it? I am thinking about a new BOV myself.


BoostedTalon

 

[98RedGs]

Originally posted by boostedtalon
Sounds right, not sure why it would affect boost like that though, what type of BOV did you go with? Are you venting to the atmosphere? Hows it work? Do you like it? I am thinking about a new BOV myself.


BoostedTalon

He went with a 1g bov dude. Its at the top of the thread in the title. I really dont think him venting or not would cause that much of a spike. You probably have a leak somewhere. Put some soapy water around that flange and go ride around for a second, or do it at a dead stop and get someone to rev the car where you blowoff. See if you make bubbles in that area. If you do then you do have a leak. The more the bubbles (the bigger the mess) the bigger the leak could possibly be.

Let Us know what happens TechyGSX.

 

[noz]

Did you use any gasket or rtv sealent between your adapter and bov? if not then thats probably where its leaking. I used Rtv on mines without gasket and its holding boost fine.

 

[TechyGSX]

Well here's what concerns me. Let's it was leaking from the BOV adapter, wouldn't that decrease the boost going into the throttle body? If I were to remove the BOV completely, I wouldn't be able to boost at all because there would be a huge hole in the UIC pipe, so pressurized air couldn't be forced in the engine. Do you guys get where I'm going with this? A leaky BOV would just produce less boost, not more. I figure its the BCS which isn't opening the wategate fast enough causing me to spike. Hopefully the hallman I ordered will remedy that.

 

[psychlow]

Take off the BCS, and route the vacuum line from the turbo outlet to the wastegate actuator, then see how much it boosts.

If it goes to 10-11PSI, it's your BCS. If it goes higher than that, something is wrong with the wastegate or the actuator, or you're boost creeping like a madman.

 

[TechyGSX]

Do you mean connect the hose from the turbine nipple to the wastegate nipple, eliminating the T that would go to the BCS?

 

[psychlow]

That's exactly what I mean (except it's the nipple on the compressor, not the turbine if I remember correctly.)

Just to give you some background, the wastegate actuator is set to engage when it sees 10-11 PSI. The BCS just bleeds off some of the boost as long as the engine isn't knocking, which keeps the actuator from reading all of the pressure in the line, so you get 11-12 PSI (normally.)

It sounds like your BCS is bleeding off too much boost, keeping your actuator from seeing enough boost to open the gate. Direct-routing the line from the compressor will allow the actuator to read the actual boost, and will tell you if the gate/actuator is the problem, or if an MBC will take care of it.

 

[noz]

Originally posted by noz
Did you use any gasket or rtv sealent between your adapter and bov? if not then thats probably where its leaking. I used Rtv on mines without gasket and its holding boost fine.

oops my bad...your right...haha
thanks for the info =)

 

[TechyGSX]

Yeah that's what I meant, the compressor housing. OK, I'll give that a shot so I can make sure if its the wastegate or the BCS.

 

[TechyGSX]

Yup it's definately the BSC. Once I connected the compressor nipple to the wastegate it only boosted 10-11 pounds, where I was getting a solid 13 pounds before. Thanx for all your help. Can't wait for my hallman to arrive.

 

[TechyGSX]

Alright it's been a couple of days now and I've realized what my problem was the whole time. The line which Ts into the BCS was really loose on both the T and the BCS, I mean it came right off with no effort. I went over to Auto Zone and picked up some new vacuum hose, installed the BOV with the adapter and voila, no more exagerrated boost. Now I spike 15 psi and settle around 12 psi. Before I use to get a consistant 13 psi, but for some reason now the car seems faster. Might be some leaking due to the adapter not fitting well. Soon enough I'll buy an UIC Pipe and use some RTV so that BOV doesn't leak at all.

 

[Eclipse96Ryder]

the 1g bov is tyte...good upgrade, and good call on the RTV, i used it and it seals beautifully

 

[Jimmy Jr.]

Get a Brode uicp and clean your intercooler.

 

[TechyGSX]

Thanx for the advice but I'm gonna go with a Dejon Tools UIC Pipe. It's a bit more expensive but it's prettier and the pipe & couplers look well made, but I'll make sure to clean the intercooler while I'm down there.