This is topic On a naturally aspirated engine, at what hp level should u step up to a 3" exhaust? in forum Tech Talk at Northern California Ford Owners  .


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Posted by Rhombeus50 (Member # 2973) on :
 
rear wheel hp level, when do u need to step up to a 3" exhaust?
 
Posted by Primer GR40 (Member # 476) on :
 
I'd guess at around 400rwhp that a step up would be beneficial.
 
Posted by xchpstang (Member # 1206) on :
 
400RWHP would be a good start.
 
Posted by Black94 5.0 (Member # 655) on :
 
I say 400rwhp on a blower/nos or 450rwhp on an NA set up....
 
Posted by Jeff S (Member # 371) on :
 
It completely depends on the setup.
 
Posted by Rhombeus50 (Member # 2973) on :
 
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 ]
 
Posted by 1SLOWLX (Member # 558) on :
 
Get some longtubes for that thing
 
Posted by Rhombeus50 (Member # 2973) on :
 
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.
 
Posted by 66 AC COBRA of CA PERFORMANCE (Member # 904) on :
 
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
 
Posted by cobraman_1994 (Member # 467) on :
 
stick with 2 1/2 exhaust.
 
Posted by Rhombeus50 (Member # 2973) on :
 
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.
 
Posted by 1SLOWLX (Member # 558) on :
 
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.
 
Posted by Fast472Mach1 (Member # 2559) on :
 
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.
 
Posted by kwikrob (Member # 835) on :
 
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?
 
Posted by hidnn.o.s. (Member # 1219) on :
 
Anything above 450ish horsepower to the wheels and 3" will HELP, below that power it will hurt.
 




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