Need noob help with my 1G-GTE

[supranz]

Hi, after searching around the forums for a while I've found a few trinkets of information about blow of valves on 1G-GTE but nothing concrete in what people have said (I'm not saying there isn't a thread, but if there is I haven't been able to find it ). I've bought a replacement bov since my current one does a worse job than MacGyver could with 2 straws and a ping pong ball. The new one can either vent it atmospherically or plumb it back and I was wondering which I should do? I'm leaning toward plumbing it back just because I hate loud bov's.

 

[aznboik1mva]

i though 1ggtes didnt have bovs? i could be wrong

 

[supranz]

I read somewhere (I think) that originally they don't, but every 1G-GTE I've seen researching for mine has one.

 

[nick88]

i though 1ggtes didnt have bovs? i could be wrong

Every turbo engine has to have a bov or bpv.

 

[87supraguy]

yeah a turboed engine with no bov or bpv will have boost surge which is no bueno!!! from my experience you benefit more by recirculating it... (plumbing it back in) it causes less boost lag... only reason some people don't recirculate is to hear the loud pshhhh of boost air escaping into the atomoshpere... sounds almost peotic really...

so it's really a preference thing and a little bit of performance as well.

hope this helps

 

[supranz]

yeah a turboed engine with no bov or bpv will have boost surge which is no bueno!!! from my experience you benefit more by recirculating it... (plumbing it back in) it causes less boost lag... only reason some people don't recirculate is to hear the loud pshhhh of boost air escaping into the atomoshpere... sounds almost peotic really...

so it's really a preference thing and a little bit of performance as well.

hope this helps

Thanks, that does help. However I went and talked to my mechanic today (I would do it myself but I'm a poor University student with no tools or workshop) and he said that I should vent it cause plumbing it back recirculates the charged air (which is warmer) which negates what the intercooler does. Sound about right? I'm thinking to just get it mounted and live with the trumpet noise for a while until I decide fully whether to plumb it back.

 

[Dirgle]

i though 1ggtes didnt have bovs? i could be wrong

You have a good memory, the 1ggte did not come with a BOV.

Every turbo engine has to have a bov or bpv.

Negative. Like stated above the 1ggte, certain versions of the 3sgte and the turbocharged cars built by Noble, are just a few that didn't come with BOV/BPV's.

Thanks, that does help. However I went and talked to my mechanic today (I would do it myself but I'm a poor University student with no tools or workshop) and he said that I should vent it cause plumbing it back recirculates the charged air (which is warmer) which negates what the intercooler does. Sound about right? I'm thinking to just get it mounted and live with the trumpet noise for a while until I decide fully whether to plumb it back.

Wow, your mechanic scares me. His understanding of the system is a little off. A properly recirculated BPV returns the air charge pre-turbo, So it goes through the intercooler to have it's temp re-stablized. Not to mention the fact that when the pressure is released the air goes through a process of cooling just from that. Also, venting to the atmosphere can cause stumbling and potentionaly even stalling if you let off the throttle. If you can recirculate it, do so. You'll be happier in the long run.

 

[A. Jay]

You have a good memory, the 1ggte did not come with a BOV.



Negative. Like stated above the 1ggte, certain versions of the 3sgte and the turbocharged cars built by Noble, are just a few that didn't come with BOV/BPV's.



Wow, your mechanic scares me. His understanding of the system is a little off. A properly recirculated BPV returns the air charge pre-turbo, So it goes through the intercooler to have it's temp re-stablized. Not to mention the fact that when the pressure is released the air goes through a process of cooling just from that. Also, venting to the atmosphere can cause stumbling and potentionaly even stalling if you let off the throttle. If you can recirculate it, do so. You'll be happier in the long run.

... unless you have a MAP sensor instead of a MAF or AFM. I agree with everything though.

 

[Dirgle]

... unless you have a MAP sensor instead of a MAF or AFM. I agree with everything though.

I would be surprised if he did as the 1G came stock with an AFM, but yes if he has a MAP sensor it won't have these problems.

 

[87supraguy]

i was going to say the same thing DIRGLE... it does return before the turbo.....

so the 1GGTE "DIDN'T" have some sort of bov or bpv?

how would it fight boost surge?

 

[aznboik1mva]

i was going to say the same thing DIRGLE... it does return before the turbo.....

so the 1GGTE "DIDN'T" have some sort of bov or bpv?

how would it fight boost surge?

im guessing it didnt..some people run no bovs, ive heard you get a better performance gain without runnin a bov but u hear flutter alot

 

[Dirgle]

i was going to say the same thing DIRGLE... it does return before the turbo.....

so the 1GGTE "DIDN'T" have some sort of bov or bpv?

how would it fight boost surge?

Correct, the 1GGTE had no from of BOV or BPV from the factory. Unfortunately I'm not knowledgeable enough on turbocharger theory to give you an accurate answer about why the manufactures chose to omit the valve, or how they deal with the compressor surge. I have my theories but nothing I can back up with fact. Maybe one of the experts can chime in here.

 

[87supraguy]

well now that i think about some "stock" turbo chargers have a built in mechanism to help with the surge i know the saturn sky/ pontiac solstice has this on the turbo...

cause if there is no way to release or bypass the compressed air when the throttle plate closes, the boosted air literally has to go back the way it came from cause it's gotta get released from the charge pipies some how... from what i understand it's not good for the turbo because the blades on the charger are spinning in one directions and when the surge reaches the blades now they have to spin back the other way to release the pressure and basically wears the bearings and internals faster....

 

[aznboik1mva]

well now that i think about some "stock" turbo chargers have a built in mechanism to help with the surge i know the saturn sky/ pontiac solstice has this on the turbo...

cause if there is no way to release or bypass the compressed air when the throttle plate closes, the boosted air literally has to go back the way it came from cause it's gotta get released from the charge pipies some how... from what i understand it's not good for the turbo because the blades on the charger are spinning in one directions and when the surge reaches the blades now they have to spin back the other way to release the pressure and basically wears the bearings and internals faster....

yea like people with t51s dont run bov beacuse the turbo has a port for anti surge...idk how it works tho, would anybody explain this

 

[Dirgle]

yea like people with t51s dont run bov beacuse the turbo has a port for anti surge...idk how it works tho, would anybody explain this

For newer turbo's yes, but the 1GGTE and the 3SGTE didn't have these anit-surge housings.