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Old 11-16-2007, 11:31 AM   #1
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3" downpipe without software

Is anyone running a 3" downpipe on a T7 car without a software upgrade? Any issues? I was thinking about putting mine on the viggen before i install the subframe brace.

Thanks

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Old 11-16-2007, 11:34 AM   #2
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I'm t5 but many have done it, go for it.
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Old 11-16-2007, 11:43 AM   #3
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AS tweek has said, many, many people have done it. As long as you have a cat on there you should be just fine!
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Old 11-16-2007, 11:45 AM   #4
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Yep, no probs. I think Bullseye is one of quite a few with Viggens and or T7 cars to run them with no software. Works just fine and still gives a decent power increase before software.
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Old 11-16-2007, 11:48 AM   #5
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Yea i probably should, i just need to get the T7 o2 bung welded on. Jameson would you happen to know anyone good locally for the welding? Thanks guys.
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Old 11-16-2007, 11:57 AM   #6
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Yea i probably should, i just need to get the T7 o2 bung welded on. Jameson would you happen to know anyone good locally for the welding? Thanks guys.
Hmmm. My best friends family owns AGL Welding supply in Clifton, so I bet they know of someone. But I have had all my exhaust work done at Midas in Denville/Rockaway next to Pizza Hut and KFC. They do good work, they straight piped my Z and have made up some other pipes and custom installed exhaust systems on 3-4 cars of mine over the past 10 years.
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Old 11-16-2007, 12:02 PM   #7
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on the topic of 3in dp's wasn't there a member here who made them? jw
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Old 11-16-2007, 12:05 PM   #8
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on the topic of 3in dp's wasn't there a member here who made them? jw
JK, Jessop.
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Old 11-16-2007, 12:10 PM   #9
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ohhh ok i know where your talking about, i'll try to check them out over the weekend. Thanks.
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Old 11-16-2007, 12:26 PM   #10
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on the topic of 3in dp's wasn't there a member here who made them? jw
HA!
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Old 11-16-2007, 01:27 PM   #11
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Go for it!!! Got one and am now getting software. Sounds nice, faster boost but you will lose some torque. Biggest differenc is if you combine it with a bettter IC such as MP's. The combo negates the steering clamp and brace so all that beasty torque steer comes back ; )

You'll also notice that T7 will 'dumb it down' after a couple weeks. Resetting the ecu brings back all the fun! And that's why I'm going for the software.....
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Old 11-16-2007, 01:29 PM   #12
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Go for it!!! Got one and am now getting software. Sounds nice, faster boost but you will lose some torque. Biggest differenc is if you combine it with a bettter IC such as MP's. The combo negates the steering clamp and brace so all that beasty torque steer comes back ; )

You'll also notice that T7 will 'dumb it down' after a couple weeks. Resetting the ecu brings back all the fun! And that's why I'm going for the software.....
What exactly does 'faster boost' mean? I always hear this term and am confused as to what people are referring to
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Old 11-16-2007, 01:36 PM   #13
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The turbo spins up and produces boost faster due to the faster flow of the exhaust down the downpipe.


I had a 3" on my 9-3 for 8 months with no issues.
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Old 11-16-2007, 01:50 PM   #14
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Is anyone running a 3" downpipe on a T7 car without a software upgrade? Any issues? I was thinking about putting mine on the viggen before i install the subframe brace.

Thanks
Are you just doing the downpipe? If you are going all the way back with 3", you're going to hit an issue with the standard subframe brace. You'll need big-ish spacers to make it clear the larger exhaust. This doesn't effect the 6-point, which you should go for anyway
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Old 11-16-2007, 01:56 PM   #15
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The turbo spins up and produces boost faster due to the faster flow of the exhaust down the downpipe.
cool. but wouldn't the turbo spin up to speed faster with a slightly more restricted downpipe?
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Old 11-16-2007, 02:34 PM   #16
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Down pipe is on the exit side of everything.

Hot gas needs more room, so a bigger DP gets you more flow.
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Old 11-16-2007, 03:03 PM   #17
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I am getting the 6 point so i figured i'll put the dp on before i put on the brace so i dont have to take it off and put it back on when i eventually get the software.

I also have the MP intercooler installed which is great and the steering rack clamp which was desperately needed haha...i just need the software.

I figured i'd loose a little tourque with the dp, i noticed that on my 900..i had the dp, saab sport exhaust, viggen ic, and a mbc, it was a little weak at low rpms but much quicker at higher rpms...its a trade off but also alota fun.
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Old 11-16-2007, 04:38 PM   #18
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cool. but wouldn't the turbo spin up to speed faster with a slightly more restricted downpipe?
Not a chance.

edit - for clarity:

On the discharge side you want to be flowing more air, not less air. Get a bunch of water in your mouth, and try to spit it out through a straw, then try to spit it out through a piece of garden hose the same length. Which empties your mouth the quickest?

The header and turbo exhaust housing do the job of keeping the air velocities up, after the air makes it around the exhaust turbine you want to get it out of the way as quickly as possible.
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Old 11-16-2007, 07:55 PM   #19
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The header and turbo exhaust housing do the job of keeping the air velocities up, after the air makes it around the exhaust turbine you want to get it out of the way as quickly as possible.
but if the eye of your turbo is smaller than 3'', thats no good... but thats another annoyance altogether...

something tells me your car isnt gonna run as well if you had NOTHING after the turbo... just open air... that would be the quickest way of getting it out eh? ( i know im just being difficult)

i guess the stock exhaust manifold vs. headers would make the the turbo spin slower vs. faster yea?
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Old 11-16-2007, 08:11 PM   #20
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but if the eye of your turbo is smaller than 3'', thats no good... but thats another annoyance altogether...

something tells me your car isnt gonna run as well if you had NOTHING after the turbo... just open air... that would be the quickest way of getting it out eh? ( i know im just being difficult)

i guess the stock exhaust manifold vs. headers would make the the turbo spin slower vs. faster yea?
Well depending on the manifold and if its a equal length turbo manifold, that would make the exhuast pulses all at diferent times while remaing a constant exhuast flow over the turbine. Versus a stock or log manifold or anything that isnt equal length will have exhuast pulses that hit and miss (or two cylinders flowing at the same time and there is a pause or blank spot) and do not allow for a faster spool time.
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