Question on Exhaust with TURBO

Redmofo · 06-10-2007, 07:28 PM

I plan to order an exhaust this summer and a turbo kit in the winter. I was wondering if PPl with turbos are using 2.5" or 3" piping in their exhaust. I dont want to get 2.5 and creat too much pressure and then need 3". Thanks

Topik · 06-10-2007, 07:31 PM

my current setup is 3 inch turbo back until the muffler where it downsizes to 2.5 inch

Redmofo · 06-10-2007, 09:22 PM

THx
Has anyone ever used 2.5" on a turbo set up?

Blackcoog · 06-11-2007, 12:49 PM

I have a 3" setup here. I didn't have any troubles running it on my Cougar before my supercharger kit.

20COUG00 · 06-19-2007, 07:50 PM

If your going to spend the money get a 3" all the way, 2.5 will be cheaper and easier but will cut you a few losses.

SpookSVT · 06-20-2007, 06:20 PM

Seeing how the turbine operates on a pressure differential, I'd go ahead with the 3", especially if the WG is recirculated. This will keep pressure lower downstream of the turbine.

justa2pt5L · 07-19-2007, 12:37 PM

I have a 2.5" SS setup and I plan on using it with the stage 3 from joey, but my WG wont be recirculated. I think I'll be fine and I plan on testing it out on the dyno by dropping the exhaust for a run or two. Depending on what your goals are and if you want to hear the wastegate or not will determine what size exhaust you need to run. If you're going all out with a built up motor, stage 3 turbo, and you dont want to hear the WG, then buy 3". If you are going with just a stock motor and a stage 1 kit, then 2.5" will work.

If you can wait to buy the exhaust till you buy the turbo, I'll have the stage 3 tested out with a 2.5" setup before it gets cold!

Blackcoog · 07-19-2007, 01:03 PM

With any FI you never want any back pressure and since the difference from getting a 3" over a 2.5" is almost nil always go with a 3" over a 2.5" for an FI setup. That isn't to say a 2.5" won't work but if you have a choice go bigger.

justa2pt5L · 07-19-2007, 01:46 PM

With that being said, I have to state that I bought the 2.5" before the turbo was offered. I was talking to Craig at KKO and he said the 2.5" will be fine with what I had for plans at the time, so I bought it. Well a few months later I met Joey along with my newly developed, never ending expense!

Yes, if I was to do it all over again, I would've bought the 3". But now I'll test out the 2.5" and if it decreases flow/hp, then I'll sell it.

Blackcoog · 07-19-2007, 02:26 PM

That will be really interesting to see the results. Make sure to post them up.

06-10-2007, 07:28 PM	#1 (permalink)
Redmofo NECO Member Join Date: Aug 2006 Location: Hoffman Estates Posts: 886	Question on Exhaust with TURBO I plan to order an exhaust this summer and a turbo kit in the winter. I was wondering if PPl with turbos are using 2.5" or 3" piping in their exhaust. I dont want to get 2.5 and creat too much pressure and then need 3". Thanks __________________ CougarDB GMprincess: I dont want to be a FRIGID BtICH but c'mon! 5 min later me: I dont want to be a frigid BtICH but Cmon! I use to OWN a PROBE

06-10-2007, 07:31 PM	#2 (permalink)
Topik NECO Member Join Date: Apr 2004 Location: MY HOUSE Posts: 5,462	Re: Question on Exhaust with TURBO my current setup is 3 inch turbo back until the muffler where it downsizes to 2.5 inch __________________ Barack the cnt hunter 402whp 379 ft lb. 1999 3l turbo cougar 1998.5 ShtVT contour #3162

06-10-2007, 09:22 PM	#3 (permalink)
Redmofo NECO Member Join Date: Aug 2006 Location: Hoffman Estates Posts: 886	Re: Question on Exhaust with TURBO THx Has anyone ever used 2.5" on a turbo set up? __________________ CougarDB GMprincess: I dont want to be a FRIGID BtICH but c'mon! 5 min later me: I dont want to be a frigid BtICH but Cmon! I use to OWN a PROBE

06-11-2007, 12:49 PM	#4 (permalink)
Blackcoog 3L Install Maestro Join Date: Oct 2000 Location: Minneapolis, MN Posts: 4,608	Re: Question on Exhaust with TURBO I have a 3" setup here. I didn't have any troubles running it on my Cougar before my supercharger kit. __________________ Current Rides 1999 MTX Cougar, 3L Supercharged 325hp and 278tq 1999 SVT Contour, Ported 3L Visit: http://www.3lduratec.com For info on ready to drop in 3L's and our supercharger kit.

06-19-2007, 07:50 PM	#5 (permalink)
20COUG00 NECO Member Join Date: Jul 2006 Location: Winnipeg Posts: 1,555 Images: 2	Re: Question on Exhaust with TURBO If your going to spend the money get a 3" all the way, 2.5 will be cheaper and easier but will cut you a few losses. __________________ Mods: MG Body Kit with Roush Side Skirts, Dual Cat-Back Exhaust, Intake, Ciggy Plug, IMRC Relocation, Tail-Light Covers, Shorty Antenna, Escape Oil Pan, Clear Side Markers, Akuza 18's with Nankang Tires, and a T-Top Sunroof CARDOMAIN

06-20-2007, 06:20 PM	#6 (permalink)
SpookSVT NECO Member Join Date: Feb 2006 Location: MD Posts: 481	Re: Question on Exhaust with TURBO Seeing how the turbine operates on a pressure differential, I'd go ahead with the 3", especially if the WG is recirculated. This will keep pressure lower downstream of the turbine. __________________ 98' SVT Contour 3L - http://www.cardomain.com/ride/678557 00' Focus ZX3 - AWD, 3.5L project car - http://www.cardomain.com/ride/2625400/1

07-19-2007, 12:37 PM	#7 (permalink)
justa2pt5L NECO Member Join Date: Jan 2007 Location: Chesterfield Michigan Posts: 170 Images: 6	Re: Question on Exhaust with TURBO I have a 2.5" SS setup and I plan on using it with the stage 3 from joey, but my WG wont be recirculated. I think I'll be fine and I plan on testing it out on the dyno by dropping the exhaust for a run or two. Depending on what your goals are and if you want to hear the wastegate or not will determine what size exhaust you need to run. If you're going all out with a built up motor, stage 3 turbo, and you dont want to hear the WG, then buy 3". If you are going with just a stock motor and a stage 1 kit, then 2.5" will work. If you can wait to buy the exhaust till you buy the turbo, I'll have the stage 3 tested out with a 2.5" setup before it gets cold! __________________ Custom Millennium Body Kit, Preditor Hood, Z3 fenders, CC Short Throw Trubendz SS Dual Exit w/Magnaflow, Built 3.0L, NPG Stage 3 kit

07-19-2007, 01:03 PM	#8 (permalink)
Blackcoog 3L Install Maestro Join Date: Oct 2000 Location: Minneapolis, MN Posts: 4,608	Re: Question on Exhaust with TURBO With any FI you never want any back pressure and since the difference from getting a 3" over a 2.5" is almost nil always go with a 3" over a 2.5" for an FI setup. That isn't to say a 2.5" won't work but if you have a choice go bigger. __________________ Current Rides 1999 MTX Cougar, 3L Supercharged 325hp and 278tq 1999 SVT Contour, Ported 3L Visit: http://www.3lduratec.com For info on ready to drop in 3L's and our supercharger kit.

07-19-2007, 01:46 PM	#9 (permalink)
justa2pt5L NECO Member Join Date: Jan 2007 Location: Chesterfield Michigan Posts: 170 Images: 6	Re: Question on Exhaust with TURBO With that being said, I have to state that I bought the 2.5" before the turbo was offered. I was talking to Craig at KKO and he said the 2.5" will be fine with what I had for plans at the time, so I bought it. Well a few months later I met Joey along with my newly developed, never ending expense! Yes, if I was to do it all over again, I would've bought the 3". But now I'll test out the 2.5" and if it decreases flow/hp, then I'll sell it. __________________ Custom Millennium Body Kit, Preditor Hood, Z3 fenders, CC Short Throw Trubendz SS Dual Exit w/Magnaflow, Built 3.0L, NPG Stage 3 kit

07-19-2007, 02:26 PM	#10 (permalink)
Blackcoog 3L Install Maestro Join Date: Oct 2000 Location: Minneapolis, MN Posts: 4,608	Re: Question on Exhaust with TURBO That will be really interesting to see the results. Make sure to post them up. __________________ Current Rides 1999 MTX Cougar, 3L Supercharged 325hp and 278tq 1999 SVT Contour, Ported 3L Visit: http://www.3lduratec.com For info on ready to drop in 3L's and our supercharger kit.

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