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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 10-11-2007, 07:07 PM   #1
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opinions on gen saab delivery pipe

i was lookin at possibly buying the delivery pipe and im wondering if the bigger piping would make me lose some spool up and if it would actually be worth it? would i see any gains from it? would i notice any loss from it? give your opinions and info.
--by the way. im stage 5 dynoed 279whp 311 wtrq lb ft hopin to see a bit more next dyno in maybe a month or so
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Old 10-11-2007, 07:12 PM   #2
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Need info on who's stage 5? What turbo? Other current HW?
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Old 10-11-2007, 07:21 PM   #3
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Need info on who's stage 5? What turbo? Other current HW?
1999 9-3
t25/28 hybrid
3 inch turbo back exhaust
50 lb injectors
fmic
jsp tune
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Old 10-11-2007, 07:30 PM   #4
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The pipe may help with total HP & TQ peak output. However, I think you will be giving up some spool time because of the increased size. If you had a T7 I would say defiantly skip it for now because of the heat properties the stock plastic piece vs. metal but you are T5 you have metal as is.. It's the speed of the air more so than the volume that is normally the only issue up till about 400hp, you get that w/ more boost as we all know and love. I would say it could be worth it will help with mid/top and give-up some downlow for ya. Might net 15hp and 15tq or so from it.
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Old 10-11-2007, 07:33 PM   #5
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I have 1 of the 3 MP Performance versions (pretty much identical design), and my spool time actually decreased. I'm not sure why you thought it would increase?

There was definitely a gain in performance from the on-road feeling. My dyno runs couldn't really be conclusive as I modified other parts as well.

I would reccomend this part. My deciding factor was that it looks amazing, and I knew it wouldn't hurt performance, you know?
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Old 10-11-2007, 08:37 PM   #6
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The pipe may help with total HP & TQ peak output. However, I think you will be giving up some spool time because of the increased size. If you had a T7 I would say defiantly skip it for now because of the heat properties the stock plastic piece vs. metal but you are T5 you have metal as is.. It's the speed of are more so than the volume that is normally the only issue up till about 400hp, you get that w/ more boost as we all know and love. I would say it could be worth it will help with mid/top and give-up some downlow for ya. Might net 15hp and 15tq or so from it.
i really love the quick spooling small t25/28 turbo. thats why i went with that turbo was for quick spooling and drivability. but having that pipe would look very nice under the hood in place of the stock one, and if it could net me 15 hp 15 lb ft roughly that would be great cause i would love to see 300whp next dyno session. (i know 300whp is probably pushing it for that turbo though) i love the low end i have so id hate to sacrifice that but id like to see some mid-top end too as it seems my top end is tapering off 5k+. so even with the small turbo i should still see some gain mid-top end but maybe lose a little bottom? thanks guys and keep them coming!

Last edited by sleet; 10-11-2007 at 09:02 PM.
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Old 10-11-2007, 10:06 PM   #7
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Ok here is the thing. The larger volume will reduce the velocity at which the charge pressure travels and as you already know the larger volume to fill means slightly delayed boost. If you put this delivery pipe on I don't see you gaining anything but instead maybe loosing some peak power. There is a reason the larger delivery pipes are noted for above 400 hp where that volume off air is beginning to choke on itself and the larger cross section (in tern more total volume) will keep the velocity of the charge pressure closer to what it was before it became a restriction.

So don't order it unless you go to a gt30 really is my opinion. Instead, take a day and pull off your oem delivery pipe and go to town on it and clean it up and it will look just as nice if not nicer.



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Old 10-11-2007, 10:57 PM   #8
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Ok here is the thing. The larger volume will reduce the velocity at which the charge pressure travels and as you already know the larger volume to fill means slightly delayed boost. If you put this delivery pipe on I don't see you gaining anything but instead maybe loosing some peak power. There is a reason the larger delivery pipes are noted for above 400 hp where that volume off air is beginning to choke on itself and the larger cross section (in tern more total volume) will keep the velocity of the charge pressure closer to what it was before it became a restriction.

So don't order it unless you go to a gt30 really is my opinion. Instead, take a day and pull off your oem delivery pipe and go to town on it and clean it up and it will look just as nice if not nicer.

thats what i was thinking, i was thinking unless im running more power with a bigger turbo i probably shouldnt get the pipe but i figured id ask anyways. ive thought about taking the pipe off and tryin to clean it up some. and by the way, genuinesaabs site says 300+ hp i guess so they can sell more. so i think im gonna stick with the stock unit for now as i dont think it would be a worthwhile 250 bucks spent. it just looks so nice and tempting... but i dont think i would benefit enough if at all from it.
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Old 10-12-2007, 02:58 AM   #9
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I agree with stromer.

I've got the larger pipe on my 9000 and it made a significant difference in top end (I'd say especially on stage 4-5 cars) and if anything it spools faster. Letting the car breathe better certainly isn't going to hurt anything.

Larger duct may mean slower velocity for the same amount of air, but less pressure drop....so its not all bad
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Old 10-12-2007, 06:40 AM   #10
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I had an MP delivery pipe on my stage4 2.3 vert - it looked good too ;].

P.S. And it's still for sale ;P
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Old 10-12-2007, 06:54 AM   #11
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I had an MP delivery pipe on my stage4 2.3 vert - it looked good too ;].

P.S. And it's still for sale ;P
nice advertisements

It says right on the GS site that your car should be putting down 300hp or more for the pipe to be effective.
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Old 10-12-2007, 07:03 AM   #12
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So Stage IV and above.
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Old 10-12-2007, 07:10 AM   #13
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NahumCC thank you for backing me up on that one!
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Old 10-12-2007, 10:51 AM   #14
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ahh i have a solution to the question i going to dyno at nicks and i want one of these so maybe with everyones permission have time to do one run without it and run with it. (sqr stg. 3) and if it lose hp/tq i'll take it off at wait tell next spring when i go bigt28.
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Old 10-12-2007, 11:49 AM   #15
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I have very large intercooler-throttle body plumbing on my 9000 (2.75"), and the stock stuff is pretty small.

My car is NOT laggy at all, and the increased tubing alone too care of my boost tapering out at high RPMs. I had this tubing on my car after installing a TD04hl-15t and at the time I was dropping from around 18psi at 4000rpm to around 11 psi by red-line. This was noticeably changed when I put the large tubing on the car, and then more so when I upgraded the intercooler a few weeks later!
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Old 10-12-2007, 12:01 PM   #16
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ahh i have a solution to the question i going to dyno at nicks and i want one of these so maybe with everyones permission have time to do one run without it and run with it. (sqr stg. 3) and if it lose hp/tq i'll take it off at wait tell next spring when i go bigt28.

i would love to see the dyno results with and without the pipe.

Last edited by sleet; 11-07-2007 at 12:41 PM.
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Old 11-07-2007, 12:42 PM   #17
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any info on the dyno yet with and without the pipe?
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Old 11-07-2007, 01:15 PM   #18
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any info on the dyno yet with and without the pipe?
He didn't end up going.
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Old 11-09-2007, 03:28 PM   #19
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Ok here is the thing. The larger volume will reduce the velocity at which the charge pressure travels and as you already know the larger volume to fill means slightly delayed boost. If you put this delivery pipe on I don't see you gaining anything but instead maybe loosing some peak power. There is a reason the larger delivery pipes are noted for above 400 hp where that volume off air is beginning to choke on itself and the larger cross section (in tern more total volume) will keep the velocity of the charge pressure closer to what it was before it became a restriction.

So don't order it unless you go to a gt30 really is my opinion. Instead, take a day and pull off your oem delivery pipe and go to town on it and clean it up and it will look just as nice if not nicer.
This is being discussed on another site, but I did dyno with my set-up with larger 2.5" delivery pipe and gs 2.5" tb. I gained 7whp and lost 22wtrq. It delayed the onset of the boost and smoothed out the power in my opinion which is better for the transmission. It seems to move the torque band over a few hundred rpm.

I got smoother power transistion and I wanted that because my car had the wait, wait, wait, bam all the torque at once feel. The larger delivery pipe seemed to smooth this out a good bit. I have one on my 9k aero and my ng900 that I made from some 45* bends and some rubber and silicone elbows. I think I made mine for about 80-100 bucks.... Mike Saunder's is nice too with the truck silicone tubing. Having rubber near the dp is a good thing for fighting heat soak.

John
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Old 11-09-2007, 03:40 PM   #20
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correct me if im wrong but the stock pipe is 2 inches and gensaabs is 2.5? if thats the case why not go in the middle make a nice perty pipe 2.25 inches for in between applications. id imagine they would sell a lot more of the 2.25 than the 2.5
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