2.0L LNF Performance Tech 260hp and 260 lb-ft of torque Turbocharged tuner version.

Forge Motorsport BPV Review.

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Old 12-08-2010 | 09:57 PM
  #51  
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Originally Posted by gdubs
waht u cant see is the fire hydrant right next to the driveway
lmao i actually looked back at the video, "did i miss that?!" ya bastid! haha!
Old 12-08-2010 | 11:34 PM
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hahaha.
Old 12-09-2010 | 02:24 AM
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Nice review. I'd been wondering if this mod had been causing issues or solving them-sounds like the latter in your case anyway
I'd also probably be down for a group buy.
Old 12-09-2010 | 10:36 AM
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Originally Posted by ninja44
Where are you folks applying the grease? So the consensus is that the heavier spring is not necessary even when pushing 24 psi on the stock turbo?
new they come greased. But you grease the piston.

They offer a kit, but unless you really wear out the piston just grease.

Guide to how:
http://www.forgemotorsport.co.uk/valve_service.pdf

Link to the valve rebuild:
Forge Motorsport | Alloy Fabrication

gdubs - I dunno if you've talked to Forge about selling this bpv for the lnf in the US? I emailed them informing them of the fitment and that you got it working. So hopefully they test it and post it on their site as a usable part for the cobalt, hrr etc.

Last edited by northvibe; 12-09-2010 at 10:41 AM.
Old 12-09-2010 | 11:33 AM
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Yup I spoke with mike at forge motorsport us division. Problem is their website is based out of the UK. So updates are very slow. He said he was going to try and get on the site and answer any questions
Old 12-09-2010 | 11:47 AM
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Dammit I can't watch the video because I'm at work but I havent seen people this excited about a product for the LNF since the K&N SRI was releassed. What's all the excitement about?!?! Does it simply reduce surge issues, does it imporve sound, what is it?

Anyways my 2 cents, Forge makes great stuff I had a Forge BOV on my Talon back in the day and you could tell just by looking at the piece it was quality.
Old 12-09-2010 | 11:49 AM
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Originally Posted by gdubs
Yup I spoke with mike at forge motorsport us division. Problem is their website is based out of the UK. So updates are very slow. He said he was going to try and get on the site and answer any questions
hey you never answered my question about the sound...is it like a metallic ping? like 2 swords clashing or mario getting a coin?
Old 12-09-2010 | 12:08 PM
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No. Not at all. Sounds like a bov. Lol
Old 12-09-2010 | 12:11 PM
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Originally Posted by gdubs
No. Not at all. Sounds like a bov. Lol
damn it. I miss the coin sound.
Old 12-09-2010 | 12:16 PM
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here is kinda what it sounds like

YouTube - Forge BPV with Cobb SRI
Old 12-09-2010 | 12:19 PM
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1up!!!!lol
Old 12-09-2010 | 12:21 PM
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Lol. Nope not at all.
Old 12-09-2010 | 12:24 PM
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Originally Posted by gdubs
Lol. Nope not at all.
that makes me sad, but I'll still get it. The plastic one on the ms3 was known to have a slight leak and the forge would hold boost much better and to the end. Its a good upgrade like you stated, specially if people stay on the stock turbo. I'll have to get me onez.
Old 12-09-2010 | 03:18 PM
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Originally Posted by northvibe
that makes me sad, but I'll still get it. The plastic one on the ms3 was known to have a slight leak and the forge would hold boost much better and to the end. Its a good upgrade like you stated, specially if people stay on the stock turbo. I'll have to get me onez.
the forge would hold boost much better and to the end.

Can you tell me why? The stock BPV not only has the spring to hold it but under boost, the vacuum line is now providing ADDED pressure (the boost itself) equal to the boost *on the other side*. So you have the spring pressure (8lbs) PLUS the boost pushing againt the valve. It's only going to fail to hold if it's cracked. Did you see the condition of the OP's valve..PRISTINE. Not knocking this mod..very nice..go for it if you like. But the stock BPV works fine.
Old 12-09-2010 | 03:21 PM
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Originally Posted by ronn
the forge would hold boost much better and to the end.

Can you tell me why? The stock BPV not only has the spring to hold it but under boost, the vacuum line is now providing ADDED pressure (the boost itself) equal to the boost *on the other side*. So you have the spring pressure (8lbs) PLUS the boost pushing againt the valve. It's only going to fail to hold if it's cracked. Did you see the condition of the OP's valve..PRISTINE. Not knocking this mod..very nice..go for it if you like. But the stock BPV works fine.
The stock BPV diaphram is prone to cracking, collapsing under high boost sometimes and not seating properly (sticking open) which causes boost leaks. If I ever have an issue with mine (none that I know of yet) I will switch over that is if I am still on the stock turbo then
Old 12-09-2010 | 03:28 PM
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Originally Posted by Terminator2
The stock BPV diaphram is prone to cracking, collapsing under high boost sometimes and not seating properly (sticking open) which causes boost leaks. If I ever have an issue with mine (none that I know of yet) I will switch over that is if I am still on the stock turbo then
ronn - term2 stated it best.
Old 12-09-2010 | 03:40 PM
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Originally Posted by northvibe
ronn - term2 stated it best.
Sticking open?? The force of the spring would normally insure that doesn't happen. In fact I think it's more likely for the Forge to stick open with the stock spring. I guess anything's possible. I'm just saying there's a lot of *mis-information* out there.
Almost certain to switch if I ever have a problem. If it ain't broke......you know the rest.
Old 12-09-2010 | 03:46 PM
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I have a *request* for all those replacing their BPV here. Could you please post the condition of the stock BPV and # miles you had on it? Pics would be even better.
Thanks...
Old 12-09-2010 | 03:52 PM
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Originally Posted by Terminator2
The stock BPV diaphram is prone to cracking, collapsing under high boost sometimes and not seating properly (sticking open) which causes boost leaks. If I ever have an issue with mine (none that I know of yet) I will switch over that is if I am still on the stock turbo then
Asisde from what I just posted...All of the pics I've seen of the STOCK BPV..around 4 so far... (which were replaced with the Forge) have shown a pristine valve. I know they can crack..I saw a pic from a foreign car (using same valve, but different application) that was cracked.
Old 12-09-2010 | 03:58 PM
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Originally Posted by ronn
Asisde from what I just posted...All of the pics I've seen of the STOCK BPV..around 4 so far... (which were replaced with the Forge) have shown a pristine valve. I know they can crack..I saw a pic from a foreign car (using same valve, but different application) that was cracked.
Tha valve kinda flops around in there and sometimes becomes stuck which causes the diaphram not the seat completely which causes a boost leak. The valve can look just fine but still stick. The Forge BPV is a better design but it does require lubing.
Old 12-09-2010 | 04:06 PM
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This is another diaphragm style bpv. As you can see, it can crack or tear. It can also fault in that half of it will bend and the other half will remain in its resting position haltering proper function.

I agree, if it isn't broken, don't fix it, but the other turbocharged vehicles being produced today have since gotten the memo and switched to a pure piston style diverter valve. Audi, after 7 revisions of a diaphragm style, has now switched to the piston valve.

Forge makes products that arent just good quality, they are reliable. Look under the hood of any Pike's peak climber and youll see a forge. Look under any of the club level racers hoods and your pretty much guranteed to see forge parts. They dont just work, their trusted. I endorse forge because I have never had a forge unit fail on me or any of my cars, or any of the teams cars (except the plastic solenoids... but they cant be held responsible for that)
Old 12-09-2010 | 08:41 PM
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The pilot shaft on my diaphragm seemed to stick in the cap occaisionally; I tweaked it with a little sandpaper and have no issues. I understand Ronn's position however the op's problems are gone and Term pointed out other "weak links". A couple of other things-Dejon offers a heavier spring (ostensibly for a reason); the new LNF's have a metal bpv cap (ditto); then there's the fact that GM wants like $75 for the rebuild kit. Makes me curious if the Solstice/Sky community have had similar issues (especially higher mileage cars) or if they have experience with the Forge piece.
Old 12-09-2010 | 08:46 PM
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How do us Canadians get our hands on this? Tried adding it to cart but only says shipping to lower 48.
Old 12-09-2010 | 09:21 PM
  #74  
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Originally Posted by northvibe
that makes me sad, but I'll still get it. The plastic one on the ms3 was known to have a slight leak and the forge would hold boost much better and to the end. Its a good upgrade like you stated, specially if people stay on the stock turbo. I'll have to get me onez.
Originally Posted by ronn
the forge would hold boost much better and to the end.

Can you tell me why? The stock BPV not only has the spring to hold it but under boost, the vacuum line is now providing ADDED pressure (the boost itself) equal to the boost *on the other side*. So you have the spring pressure (8lbs) PLUS the boost pushing againt the valve. It's only going to fail to hold if it's cracked. Did you see the condition of the OP's valve..PRISTINE. Not knocking this mod..very nice..go for it if you like. But the stock BPV works fine.
I know this was earlier but he didn't mention in his reply that he was talking about the Mazdaspeed 3 stock bpv which is known to have issues if you check out msf.org. I agree though unless I start having issues with my gms1 like op and this seems to be the cause or my stock one gets cracked / nipple breaks off I will switch to the forge but until then like you said if it ain't broke not worth fixing until needed.
Old 12-09-2010 | 09:27 PM
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Originally Posted by murrant22
How do us Canadians get our hands on this? Tried adding it to cart but only says shipping to lower 48.
Anyone in in canada who wants one PM me. Ull buy it. Ship it to my house. Ill then ship it to you. U have to pay for it all



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