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Old 05-09-2011, 04:31 PM   #1 (permalink)
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Default Turbos with 2.5" or smaller exhaust

i was wondering who on DSO is running a 2.5" or smaller exhaust on your boosted engines. im curious to see the usual output with 2.5" or smaller exhaust on a small turbo d16
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Old 05-09-2011, 04:41 PM   #2 (permalink)
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I made 270whp on a 2.25" exhaust.
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Old 05-09-2011, 04:48 PM   #3 (permalink)
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Quote:
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I made 270whp on a 2.25" exhaust.
more info plz? what engine, turbo, psi, tuning?
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Old 05-09-2011, 04:51 PM   #4 (permalink)
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This was last summer's build.

A6 block, Z6 head, FJ rods, Vitara Pistons, GT2860RS at 15 psi, tuned on crome. 267whp, 222ftlbs.
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Old 05-09-2011, 04:52 PM   #5 (permalink)
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Oh yeah and the exhaust was a clusterfuck kinda. 3" downpipe, 2.5" from downpipe to axle, 2.25" axleback.
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Old 05-09-2011, 05:18 PM   #6 (permalink)
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I made 230whp on a stock D16Y8 w/ .63 eGay set up on 11 psi with a 2.25" down pipe and a 2.25" exhaust.


Tuner said exhaust wasnt choking it.
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Old 05-09-2011, 05:25 PM   #7 (permalink)
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On a stock bottom end build? ~200 hp?

At low power I doubt you would see any noticeable power gain between 2.5 and 3" exhaust, although they would be an improvement of spool.

At 300+ hp it would be a waste not to run 3" exhaust (maybe keep the DP 2.5" if youre keeping AC)
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Old 05-09-2011, 05:27 PM   #8 (permalink)
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Pretty much. On a stock build keep it smaller, keep it quieter. On a built engine shooting for numbers go 3".
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Old 05-09-2011, 07:41 PM   #9 (permalink)
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Im running 2.5" right now on the stock bottom end around 220whp; engine is coming out tomorrow night to get rebuilt and im keeping to 2.5" but I have a cutout for the track
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Old 05-09-2011, 10:35 PM   #10 (permalink)
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Quote:
Originally Posted by DarkCreep View Post
I made 230whp on a stock D16Y8 w/ .63 eGay set up on 11 psi with a 2.25" down pipe and a 2.25" exhaust.

Nice. with stock clutch?
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Old 05-10-2011, 02:35 AM   #11 (permalink)
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i have a 60mm Apexi N1,cat converter with a gt2860r and made 330hp at 22psi...the exhaust setup is probably killing it...thinking to go up to a straight 3" exhaust system but still dont have the money!!!

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Old 05-10-2011, 05:04 AM   #12 (permalink)
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i have a 60mm Apexi N1,cat converter with a gt2860r and made 330hp at 22psi...the exhaust setup is probably killing it...thinking to go up to a straight 3" exhaust system but still dont have the money!!!
r or rs? seems like alot for a r.
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Old 05-10-2011, 06:32 AM   #13 (permalink)
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Quote:
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Nice. with stock clutch?
No, stock clutch is piss weak. It's only good for about 140 ft lbs.
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Old 05-10-2011, 12:30 PM   #14 (permalink)
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ok cool, i was planning on 2.25" catback with itr muffler on a z6/greddy 15g. glad it wont kill the little bit of power im planning on
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Old 05-10-2011, 02:32 PM   #15 (permalink)
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Quote:
Originally Posted by hotrodj View Post
r or rs? seems like alot for a r.
LOL its a gt2860r not an rs...and yeah im really pushing it...23psi all the way...im looking to upgrade on a gt2871r and a new 3" exhaust system!!!
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Old 05-10-2011, 05:28 PM   #16 (permalink)
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I made 322 on a 2.5". Trying to break that soon. Still working out some bugs. Just about finished up finding them all, then I need a retune.
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Old 05-10-2011, 08:19 PM   #17 (permalink)
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Quote:
Originally Posted by Sentry View Post
No, stock clutch is piss weak. It's only good for about 140 ft lbs.
dang that sucks. i didnt know that. THANKS FOR THE INFO! repped.
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Old 05-10-2011, 09:31 PM   #18 (permalink)
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Quote:
Originally Posted by d16turboguy View Post
Nice. with stock clutch?
Yes on stock clutch. Exedy OEM spec with about 15k.
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No, stock clutch is piss weak. It's only good for about 140 ft lbs.
It held the 190wtq+ I threw at it just fine for about 9 months and it chirped 3rd.


Not completely disagreeing with you though, I couldve chirped 4th if I had a stiffer clutch.
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Old 05-10-2011, 09:52 PM   #19 (permalink)
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hope i make 350whp on my 2.25in exhaust!!!well thats my goal
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Old 05-10-2011, 10:01 PM   #20 (permalink)
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Yeah thats kinda pushing. At that HP goal ill just got 3".
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