will it go faster with open headers? 408w - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 8 Old 08-06-2008, 01:43 PM Thread Starter
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will it go faster with open headers? 408w

lightweight coupe
408w
13:1 compression
victor jr intake
.650 solid roller, 254/258 duration
2" kooks longtubes

I just finished putting the car back together had some bad luck at the track
and hit the wall. Also, blown head gasket. I was thinking of not installing the 3" xpipe/mufflers and running turn downs after the collectors.
Think it will pick up som hp?


83 Mustang Coupe - 10.27 @ 131 on motor
97 twin turbo vette - 10.69 @ 133
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post #2 of 8 Old 08-06-2008, 08:09 PM
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On my setup, I think the ET gain I see is more from the weight than horsepower. It might pick up a little, but I run Dynomax Ultraflo welded mufflers and full 3" pipe. Thats about 50 lbs worth of weight coming off, so about .5 in ET gain and a mph or so.


Carl S.: 417", Yates C3s, Edelbrock 2828, Dominator, Powerglide, 4.10s, 3100 lbs raceweight. 1.27 60' [email protected] nitrous on 275/60 Mickeys in Ultra trim
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post #3 of 8 Old 08-06-2008, 09:46 PM
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I'd run the x-pipe.

X275 build in progress follow on Mustang Junkies.net

http://www.mustangjunkies.net/f9/project-dirty-red-444
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post #4 of 8 Old 08-06-2008, 10:15 PM
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If you can, run just the x pipe without mufflers then drop the x pipe and see what the difference in et is. What I would highly recomend doing is purchasing a set of merged collectors and a set of burns stainless collector mufflers... the merge collector will give you the most gains over the x pipe setup. Of course that might not be in the budget... The x pipe is your best bet though... also, dont run just open headers, attach an 18" extention on each collector and paint them with some high temp paint, after making a pass take a look at the extentions, where ever the paint has burned off to is where you need to trim the extention...
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post #5 of 8 Old 08-06-2008, 10:16 PM
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sorry... double post
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post #6 of 8 Old 08-07-2008, 09:07 AM
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yes, it will help quite a bit. I have a nearly identical combo and it picked up 2 tenths.

91GT
8.90 @ 150 mph NA
1.22 60ft
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post #7 of 8 Old 08-07-2008, 12:23 PM
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Quote:
Originally Posted by White90GT View Post
Thats about 50 lbs worth of weight coming off, so about .5 in ET gain and a mph or so.
I think you mean .05 or your exhaust is 500 lbs.

88 LX, 69 410W , AFR ??/70mm T.B., FTI cam, 3.55's, BBK 1 3/4" L.T, Edel 351W Victor intake, ???mm maf, 60 lbs. injectors,MSD, chipped Vortech T trim making 16 psi, MAFtuner, PA AOD - Lentech VB-5000 non-lockup, Mr. Freeze.
Old best 1/4-11.056 @ 123.62 mph Spinning real bad! Old setup
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post #8 of 8 Old 08-11-2008, 08:34 AM
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Quote:
Originally Posted by Len Schmidt View Post
I think you mean .05 or your exhaust is 500 lbs.
Yes, .05 gain, but at the 1/8 mile. About .1 at the 1/4 for my car I believe.

Carl S.: 417", Yates C3s, Edelbrock 2828, Dominator, Powerglide, 4.10s, 3100 lbs raceweight. 1.27 60' [email protected] nitrous on 275/60 Mickeys in Ultra trim
2014 Ruby Red GT Auto, bone stock for now
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