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Author
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Topic: On a naturally aspirated engine, at what hp level should u step up to a 3" exhaust?
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STREETFIGHTER50
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Member # 2973
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posted
 
 
rear wheel hp level, when do u need to step up to a 3" exhaust?
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'89 Coupe-Kurgan Tuned 498/491RW, Vortech SI, 351W
Posts: 3925 | From: SF Bay Coastin' to Rocklin | Registered: Jun 2003
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Primer GR40
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Member # 476
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posted
I'd guess at around 400rwhp that a step up would be beneficial.
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Superdupercharged Cobra
No Transmatic Notch
Posts: 2108 | Registered: Sep 2001
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xchpstang
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Member # 1206
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posted
400RWHP would be a good start.
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04 Cobra, K&N FIPK,
Posts: 239 | From: Turlock | Registered: Apr 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
I say 400rwhp on a blower/nos or 450rwhp on an NA set up....
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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Jeff S
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Member # 371
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It completely depends on the setup.
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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STREETFIGHTER50
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Member # 2973
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posted
Currently, this is the list:
331" stroker, C&L 76mm, 75mm TB, Holley intake(opened inlet to 75mm), AFR 185's(61cc 10.1 compression), Comp XE282HR cam, & Pro Magnum 1.6 rockers.
Stock fuel system w/Walbro 255 in-tank pump, Kirban FPR, & FMS 30lb injectors.
Bassani 1 3/4" shorties, Mac 2 1/2" X-pipe, & Magnaflow 2 1/2" cat-back.
Will my exhaust be cool or would I benefit in a 3" system? Also, would this make it in the 11's? It's all goin into my '92 notch w/5sp & 4:10's.
[ October 18, 2003, 10:29 AM: Message edited by: Rhombeus50 ]
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'89 Coupe-Kurgan Tuned 498/491RW, Vortech SI, 351W
Posts: 3925 | From: SF Bay Coastin' to Rocklin | Registered: Jun 2003
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1SLOWLX
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Member # 558
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posted
Get some longtubes for that thing
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Built Tuff with your stuff ;)
Posts: 5231 | From: bay area | Registered: Nov 2001
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STREETFIGHTER50
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Member # 2973
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posted
I have sum Mac 1 3/4" LTs I'm tryin to sell. They're for an automatic. I'm gonna try out my system first, if I can't bust 11's maybe I'll switch sumthin.
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'89 Coupe-Kurgan Tuned 498/491RW, Vortech SI, 351W
Posts: 3925 | From: SF Bay Coastin' to Rocklin | Registered: Jun 2003
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66 AC COBRA
Nitrous King
Member # 904
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posted
dont even bother with the shorties, use the long tubes u have anbd sell the shorties, those shorties will hold u back more than ur fuel system
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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cobraman_1994
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Member # 467
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posted
stick with 2 1/2 exhaust.
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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STREETFIGHTER50
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Member # 2973
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posted
What's the big deal w/1 3/4" shorties vs. 1 3/4" LT's. I heard that the shorties would give me more hp & torque down low, but the LT's pick up about 15-20 hp way up in the rpms. Is this true? My car is gonna be a street car & I don't think I'll be revving it past 5k too often, especially on the street.
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'89 Coupe-Kurgan Tuned 498/491RW, Vortech SI, 351W
Posts: 3925 | From: SF Bay Coastin' to Rocklin | Registered: Jun 2003
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1SLOWLX
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Member # 558
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posted
I have long tubes on my new setup. I have heard they are better and pickup a lot more power than shorties all the way up.
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Built Tuff with your stuff ;)
Posts: 5231 | From: bay area | Registered: Nov 2001
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Fast472Mach1
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Member # 2559
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posted
You only see 3 inch systems on race cars for the most part. You don't need a 3 inch system until you make insane amounts of power really.
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11.7@116 1.7 60ft. N/A
11.4@124 1.9 60ft. 100NX
Posts: 639 | From: Laguna West | Registered: Mar 2003
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kwikrob
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Member # 835
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posted
quote:
Originally posted by Rhombeus50:
What's the big deal w/1 3/4" shorties vs. 1 3/4" LT's. I heard that the shorties would give me more hp & torque down low, but the LT's pick up about 15-20 hp way up in the rpms. Is this true? My car is gonna be a street car & I don't think I'll be revving it past 5k too often, especially on the street.
If your car isn't going to be revved much above 5, stick with the 2 1/2 inch. Also, if you're using shorties for low end torque and hp, why kill it with 3 inch?
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Slowest car on this board!
Posts: 382 | From: Bay Area | Registered: Feb 2002
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hidnn.o.s.
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Member # 1219
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posted
Anything above 450ish horsepower to the wheels and 3" will HELP, below that power it will hurt.
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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