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Re: open headers vs. full exhaust ? UPDATE
[Re: 68LAR]
#803359
09/19/10 10:39 AM
09/19/10 10:39 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
And the winnner is........wait for it.... wait for it..... Mr. Yuck  
My car now has a new best in both ET and mph.
How's 11.28 @ 121.23 sound? The way the car ran shocked the heck out of me. I would have never thought it... By the way, I never opened the hood. The only adjustments were to tire pressure and shock settings. 
 told ya so...lol good job. I can't wait to get mine to the track. I'd love to see thse kinds of numbers.
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Re: open headers vs. full exhaust ? UPDATE
[Re: BSB67]
#803363
09/19/10 12:54 PM
09/19/10 12:54 PM
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Joined: Oct 2003
Posts: 4,008
South Park, Pa.
68LAR
OP
master
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OP
master
Joined: Oct 2003
Posts: 4,008
South Park, Pa.
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Quote:
Did you do back to back runs with and without the exhaust system?
FWIW, the weather difference between the Nats and PRP yesterday is worth about 0.20 sec.
No, My previous best was at the Nat's @ the 11.57 on a 95* day.
Quote:
Congrats on the new best Larry! What were the weather conditions like compared to your previous best at the Mopar Nats? I know the weather at the Nats was brutal, so I wouldn't be suprised if your gain was more to due to better weather conditions than the open headers. IMO your exhaust system sounds perfect and really shouldn't hold you back much if any.
Btw, did you do some engine changes since last year?? Seems like you picked up a lot...Or are you just getting better at bangin the gears
Weather conditions were very different. Nat's it was 95* hot and humid as you know. But, as stated, I ran my best with the 11.57 @ 118 almost 119 mph. Saturday at PRP, the weather was comfortable at around 73-75*, seemed like no or little humidity.
Over the past winter I installed 1.6 rockers and an aluminum flywheel. I didn't pick up much using my old "launch and shifting" procedures. It wasn't until the UMTR race the week before the Nat's, that some stick shift racers made some suggestions to me with the launch and shift points. I started using those suggestions at the Nat's and the performance level has jumped. I can't thank all the guys with UMTR enough. Great bunch. As far a getting better at bangin' gears,.... maybe. 
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Re: open headers vs. full exhaust ? UPDATE
[Re: 68LAR]
#803364
09/19/10 05:08 PM
09/19/10 05:08 PM
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Joined: Nov 2005
Posts: 690
New Hampshire, USA
oldiron
mopar
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mopar
Joined: Nov 2005
Posts: 690
New Hampshire, USA
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Way to go Larry  Get .15 out of the 60' & 10s street car FWIW - pulled pipes & muffs - no change to 1/4/mph but did have a best ever 60' at PRP (but really wasn't much pipe & muffler) But I like noise - can't really tell if its loud any more though, I wonder why
66 Belvedere Vert, 4 Speed/Jerico, slowly, very slowly, getting faster - NA LD Wedge New New Best: 10.56 @129 68 B'cuda 4 gear Jerico - Another New Best of 9.86 & Trying to slow up https://www.youtube.com/watch?v=T4jDLKwd9Gs
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Re: open headers vs. full exhaust ? UPDATED
[Re: fishy340]
#803368
09/20/10 10:13 AM
09/20/10 10:13 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
with x pipe 3 and 4" exhaust they have today,other then sounding like a top fuel car there is no advantage i believe..plus u have to re jet ur carb for open headers..look @ the turbo and pro charge cars w exhaust..
most of those "exhuast" systems are nothing more than a way for people to say "yeah it has exhaust" They consist of big pipes and mufflers that do anything but muffle the sound and end in dumps in front of the rear wheels. Some of those things are as loud as open exhaust. A 3" complete system, including tail pipes and mufflers (that muffle) will restrict exhaust flow.
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Mine picks up 2-3 tenths with open headers. It likes to run lean though, so we have to fatten it up.
