The official Bosch bypass thread.

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11-10-2002, 09:19 AM
468LC

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The official Bosch bypass thread.

This is the setup I use and it is dead simple and very effective.
Why the bypass?
I have already talked to at least 6 people who have had problems with off idle bucking and surging.
It seems to be most prominant with aftermarket MAF meters.
Without the bypass you could literally here the air stalling in the airfilter box area. Kind of a warbling noise.

I used a Bosch bypass valve P/N 0 280 142 108
that I picked up locally at a parts house.
Other parts needed. two 3/4"pipe to 1" barb fittings.
1' of 1"id radiator hose.
several feet of 3/16" vacuum hose.
This install had the biggest effect on drivability on the Novi1k.
It was like a new car all over again.:)

The setup on my car is without a smog pump so I don't know for sure if my setup would clear the smog plumbing or not.
I would like to get some feedback from some of you with smog to let my know if you think it would clear or not.

If you guys have any other questions feel free to ask.
11-10-2002, 12:20 PM
Goliath5.0

468LC, what are the bosch bypass valves rated at in terms of capacity? 12lbs max? Please advise.
11-10-2002, 01:16 PM
468LC

Quote:

Originally posted by Goliath5.0
468LC, what are the bosch bypass valves rated at in terms of capacity? 12lbs max? Please advise.

I have been told by many S trim owners that it will take 15psi before it starts to leak but I have no proof of this.
LOL I'm gonna try a search on the Corral.
11-10-2002, 08:15 PM
Whistler

I am still running my smog equiptment. I'll let you know how easy/difficult the install is...Prolly have it done in a week or so, I'm just waiting on my disharge tube ;) hehe
11-11-2002, 11:33 AM
Goliath5.0

Well I think mine (my bosch bypass valve) is bunking out on me :(
My idle is not the same as when I had my f-150 crank pulley. Since the 8" crank pulley installation the idle has been fluctuating from 1000 rpm to 1300 rpm.

I checked the TPS and have it around 0.95, and I even toyed with adjusting it all the way to 1.00 and still noting (went back to original 0.95 setting, idles the best for me) I think I am getting compressor surge, and the bypass is crapping out on me. I will probably get an HKS or Vortech mondo blow off valve. I dunno yet.:confused:
11-11-2002, 03:38 PM
Jason915

468LC where do you hook the vacume hoose to on your set up?
11-11-2002, 07:05 PM
dawgsgt

468LC the stang is running great with the custom discharge tube and Bosch bypass valve. My car has stopped surging and hunting for an idle. Thanks for all your help.
11-11-2002, 09:37 PM
468LC

No problem dawg.

Jason I run my vacuum line to the tree on the firewall.
I think mine is T'eed off of my Boost gauge line.
11-12-2002, 05:14 PM
root

We installed a bypass valve on Chuck's car. He has all his smog stuff, fits great!

Ian
11-12-2002, 06:24 PM
Whistler

That's good news for me Ian. I was hoping there weren't going to be any clearance issues with the smog hoses. I can't wait to get mine on!!
11-25-2002, 06:22 AM
MikeyMustang

Bridgeville ,Pa?? I live in Monroeville,Pa ...if you need a bypass...i have a extra one i can sell you brand new...BTW ever go to Keystone Raceway?.....if so I am the one with the Green and gold foxbody with the Novi1000

Mike

http://mikeymustang.no-ip.org/

best 11.81 @122mph
11-25-2002, 12:29 PM
Doug

Green and gold foxbody. HUH. Pics please :confused:
Edit. My mistake. I just seen your link, BTW I couldnt tell for sure from the pic, but is that a wing on your car?
11-25-2002, 02:00 PM
bileaux

If you need to use a bypass to chamber unwanted pressure because your t/b is closed, why do you have to plumb in back into the intake tube? Can't you just let it empty into the engine bay?
New NOVI 1000 owner with lots of questions...
Thanks,
Jean
11-25-2002, 02:13 PM
468LC

Quote:

Originally posted by bileaux
Can't you just let it empty into the engine bay?

No
You will lose metered air that was supposed to enter the engine.

It's not impossible though, it can be done with a blow through mass air meter setup.
11-25-2002, 04:03 PM
MikeyMustang

Yea big mistake!!...wing is now gone...just running a GT wing

:)

Mike
11-25-2002, 05:35 PM
Whistler

Quote:

Originally posted by MikeyMustang
Bridgeville ,Pa?? I live in Monroeville,Pa ...if you need a bypass...i have a extra one i can sell you brand new...BTW ever go to Keystone Raceway?.....if so I am the one with the Green and gold foxbody with the Novi1000

Mike

Yea I go to Keystone Raceway when I can...I know you remember me Mike. I have a black 89 GT with 93 Cobra wheels...Everytime I went to the track to race, you would ask me if I had my NOVI on yet...I'm the stupid kid who had his NOVI sitting in the garage for 2 months before I put it on.

To answer your question, i have my bypass and hoses...just need to put it on.
11-26-2002, 06:29 AM
MikeyMustang

ok thought so!! I know you LOL....ok dude let me know when you need some help :).....connect on my web page and send me a e-mail

Mike
http://mikeymustang.no-ip.org/
11-27-2002, 10:03 AM
JMORRIS

468LC or others running bypass...

Can you please post pics of the plumbing you did off the bypass valve?

Thanks,
Jermey
11-30-2002, 12:33 AM
nstycpe93

it was strange today, i took the bosch part numbers to the volvo dealer and he said he needed the year car it fit. he couldnt find a number...he found a bypass and it was metal and didnt look like the plastic bypass .

anyone else have an outlet for this part. i need to get one ordered before i get the metal pipe coming from 468LC.

thanks.
11-30-2002, 12:47 AM
468LC

Here is the p/n that I used for the Bosch valve,0 280 142 108
Any good parts house should be able to get this valve for you without any further info givin to him or her.

here is the pic of my simple 90* plumbing again.:D

http://www.novipower.com/attachment.php?s=&postid=377
11-30-2002, 09:47 AM
dawgsgt

I purchased a custom discharge tube from 468LC and he did a great job. I purchased a bypass from expressautoparts.com. The P/N is 0 280 142 110 it is a charge air bypass valve for a 2000 Saab; 9-5 Turbo V6. Hope this information helps out.

Later,

Dawg
11-30-2002, 09:59 AM
468LC

Quote:

Originally posted by dawgsgt
I purchased a custom discharge tube from 468LC and he did a great job. I purchased a bypass from expressautoparts.com. The P/N is 0 280 142 110 it is a charge air bypass valve for a 2000 Saab; 9-5 Turbo V6. Hope this information helps out.

Later,

Dawg

LOL dawg it's kind of funny you should mention that because that is your tube in the very pic above.:D
11-30-2002, 07:06 PM
dawgsgt

LOL Man thats a good lookin discharge tube.

Dawg
12-07-2002, 02:21 PM
chris

where do i find one in canada ,does anyone have one for sale up here
12-17-2002, 07:46 PM
bileaux

Questions on install...

Just got Bosch bypass today. Thought about trying to install it in the NOVI 1000 discharge tube that comes from Paxton. I have an Accufab 75mm throttle body. What size custom discharge tube could I run, and does anyone know where I could pick one up? Also, is the bypass directional? Any help will be appreciated.
Thanks...
12-17-2002, 09:50 PM
468LC

Hey bileaux
Yes the bypass is directional. The large port directly opposite of the vacuum port faces the discharge tube.

If you want some ideas on a custom dischare tube that won't collapse on itself do a search for my username and or E mail me.
SBeasley@Prodigy.net I can help you out.:)
04-26-2003, 06:37 PM
RydeOn

specifically where did you go? ive been driving around all day and nobody sales the 1" heater hose or the fittings :(
04-26-2003, 06:39 PM
root

NAPA should have Gates hose in that size.

Ian
04-26-2003, 06:49 PM
468LC

Ryde I get my fittings from Lowes in the plumbing section and the radiator hose I get from Pep Girls. LOL I just make the parts dude run around with a tape measure until he coughs up the proper hose.:)
04-27-2003, 02:05 AM
RydeOn

right on well thanks, this thread totally helped me out
04-27-2003, 04:27 PM
mygt8a4re

yeah, most auto parts houses carry it, the idiots that work there just dont have a clue. if you need bring one of the adaptors with the 1" barb end & tell them you need a hose that "this" piece fits into or see if you can talk them into letting you back to the hoses to take a look for yourself............
05-01-2003, 12:58 AM
ersunl

Holy ba-jesus I haven't been around in a while!! (apparently I never registered either??)

Anyway, time to throw up a few pics I guess :)
I'm sure these are all sitting in some ancient thread somewhere...Corral maybe??

http://www.imagestation.com/picture/...a/fd77140b.jpg
http://www.imagestation.com/picture/...5/fd7713fd.jpg
http://www.imagestation.com/picture/...2/fd7713e6.jpg
http://www.imagestation.com/picture/...a/fd7713d1.jpg
http://www.imagestation.com/picture/...c/fd8ce9a9.jpg
[IMG]
http://www.imagestation.com/picture/...8/fd8ce97c.jpg[/IMG]
http://www.imagestation.com/picture/...8/fd8ce994.jpg

I guess those last few don't really show the vacuum hose routing too well... just goes along the firewall to the tree, no big deal. I've ripped so much useless crap off the car I had no problem finding room for it. :)

-Eric
07-06-2004, 11:07 PM
5literstallion

do any more of you have pictures of your bypass setups? the pics posted didnt show up on my computer, or werent working corrrecty
07-30-2004, 12:22 AM
5literstallion

when you say the port on the bypass goes to the discharge, do you mean it goes to the intake tube, or the powerpipe?
08-01-2004, 12:08 PM
468LC

Quote:

Originally Posted by 5literstallion

do any more of you have pictures of your bypass setups? the pics posted didnt show up on my computer, or werent working corrrecty

Here is the original pic.:)

http://www.superchargerhelp.com/phot...Novibypass.JPG