is this mod the real deal or just bs ???? - Page 3 - The Saab Link Forums

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Performance Modifications for the 9-5 This forum contains PERFORMANCE related Q&A's for the 9-5. This may also include suspension.

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Old 03-17-2011, 03:37 PM   #41
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Alright well maybe you can walk me threw it a little better then the pictures.

I now should only have 2 hoses.

One that is capped on the throttle body, and another from the intake straight to the Diverter valve. Solenoid plugged in with no hoses on it?
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Old 03-17-2011, 04:08 PM   #42
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it is a easy mod and im no master tech. i hope this helps took the pics in the dark with my crappy cell so you get what you get

vac valve should have zero lines hooked to it only the electronic plug should be attached. you take the line off the throttle body and replace the hole with a vac plug found at any local parts store. there will be two vac nipples on a black plastic piece attached to the intake manifold as shown in the pic above. remove the top line and leave on the short vac line attached to the bottom that runs to the FPR. replace the line you just removed with the line running to the bypass valve/BOV. tap into that line if need be for a aftermarket boost gauge.




note this pic is upside down so the top is the vac line furthest away from the intake manifold





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Old 03-17-2011, 04:14 PM   #43
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This is probably an idiotic question but what is the right thing to use to cap the port on the TB and solenoid?
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Old 03-17-2011, 04:14 PM   #44
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If you study the linked diagrams for a little, it's not too hard to figure out. I did it in about 5 minutes. It needs a little more refining (trimming out all the extra hose and securing what's left) for full time use, bit I've just been testing. I don't know how this set-up would affect the stock BPV, because I'm running a valve identical to the Greddy Type S (fully recirculated of course) but I do know that my valve behaves like a totally different animal now. It's unbelievable how much better the valve works, and I don't completely understand why. It actually works the way it's supposed to. With the stock routing, I had to take one of the two springs out of the valve, and the only sound I got out of it was a small squeak when I let off at about 5 PSI. With this mod, I had to put the second spring back in and I get a nice crisp chirp/whistle pretty much any time I let off. I'm baffled.
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Old 03-17-2011, 04:31 PM   #45
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they come in packs at autozone or local part stores. i forget what size i got ideal size would be 3.5-4mm caps but in standard i believe its like 3/16 or something like that. some people also use stock vac line and put a small bolt on the end and use a hose clamp around that but i think thats a lot of extra crap in the car thats not needed but if you have nothing else to work with than go for it. i think vac caps come in packs of like 5 and there less then 3$

P.S. you dont need to cap off the vac valve ports just leave them open the TB is the only one you should have to cap off
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Old 03-17-2011, 04:39 PM   #46
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It's unbelievable how much better the valve works, and I don't completely understand why. It actually works the way it's supposed to. With the stock routing, I had to take one of the two springs out of the valve, and the only sound I got out of it was a small squeak when I let off at about 5 PSI. With this mod, I had to put the second spring back in and I get a nice crisp chirp/whistle pretty much any time I let off. I'm baffled.
like i mentioned earlier, its because that solenoid on the firewall is ecu controlled to make the bpv more "civil" and not go hotting around at low psi, so it takes control over the pressure the valve sees. now you are running on true manifold pressure.

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P.S. you dont need to cap off the vac valve ports just leave them open the TB is the only one you should have to cap off
i suggest you cap the solenoid for purposes of keeping dust out and not killing it.



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Old 03-17-2011, 04:51 PM   #47
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yeah prob wouldnt hurt
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Old 03-17-2011, 08:18 PM   #48
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Did this mod befor i went to a car meet with some friends with 240s, and this mod is pretty legit, BOV noise and throttle response are soo much better.
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Hell yeah. All the FWD caddys have roll races like all damn day. Then the cruise over to 'Luca's house for some hard parking and body work tips.
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Old 03-27-2011, 08:01 AM   #49
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I'll post some pics of this up as well for reference.
Attached Images
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Old 03-28-2011, 07:22 AM   #50
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just did this mod on saturday....car does seem a bit "peppy'er" now.
Glad i did it because i did not realize how brittle my vacum lines were, i pulled them gently and they broke off.

Im gonna get a few feet of line and replace all the vacum line in the near future.

THanks for posting up the mod!
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Old 03-28-2011, 07:28 AM   #51
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I'll post some pics of this up as well for reference.
I put a zip tie on the vac plug for extra security.
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Old 03-28-2011, 09:29 PM   #52
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I'm going to give this a shot, but I have at T8 car...does anyone know if this will affect the T8 since its apparently more of a spaz than T7 when it comes to mods.
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Old 03-29-2011, 04:38 AM   #53
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Shouldn't the vavle is jsut ot make the turbo seem more civil and quiet for tis segment
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Old 04-26-2011, 12:49 PM   #54
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I have tried this it does feel more responsive, but I notice that there is a third line on the Solenoid that runs downward along the firewall, what about that line?
While I am not too sure, I think it's something related to the A/C system. It's got a check valve on its way to the firewall though
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Old 04-26-2011, 07:06 PM   #55
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That T is for the solenoid that actuates the heater bypass valve on 9-5's. I have the valve eliminated on my car.

I did this mod to my 9-5. I did it a bit less intricately, though. Take vac line off of port on throttle body, plug line, then move to bypass valve line from the solenoid to the open point on the throttle body.

It does change throttle response a tad but, but it definitely dumps the boost faster, which is reassuring on a stage 3 car.
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'00 9-5 Aero
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Old 05-04-2011, 07:39 AM   #56
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did this on my Vig and the g/f's 9-5 Aero. literally took me 5 minutes a car. so easy! noticed slightly better throttle response in my car and the bpv seemed to actuate better(of course).

as far as the Aero. it reveiled how bad the stock bpv is on hers. it was hooting once in a while before but now its almost constant! we're looking to replace it soon.
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Old 05-16-2011, 05:10 PM   #57
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Hey guys I did this mod today and everything seems to work fine but when im at about 2000 rpms and hold it there. Theres like a loud hum sound and once i left of the gas it goes away. I have a Tee thing that goes from the right side of the solenoid. It goes straight from the solenoid to the tee do i just disconnect that all together? Could that be whats making the hooting noise? Sorry for the nooby questions x.x just new to this saab thing. Btw I have 1999 Saab 9-5 2.3T SE thanks in advance
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Old 05-16-2011, 05:25 PM   #58
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It's probably your bypass valve (bpv) on it's way out. It's nicknamed a hooter valve for a reason.
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Old 05-16-2011, 05:37 PM   #59
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Whats a good replacement for it? All I've done to my saab is a open air kit, saw this mod and figured why not its easy and basically free. I left the vac line from the right side of the solenoid in but it doesnt hook up to anything on the vac line on the bottom of the tee. Goes to somewhere lower on the firewall. Dont know if that'll cause it but it's probably just the BPV. Lemme know of some good replacements for it ^^
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Old 05-16-2011, 05:45 PM   #60
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Searching does wonders... but a Forge valve is good and is what many of us use. Go to Genuinesaab.com.
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