Re: Question on tuning after adding race mufflers
[Re: Dart Racer]
#1005275
06/02/11 04:20 PM
06/02/11 04:20 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
PSCA just added a muffler requirement, and so I'll be installing the Dynomax Bullet race mufflers. Any thoughts on whether I will need to change the tune with these. Car is currently just a tad on the lean side at sea level.
If your talking a big thru flow header muffler you MIGHT end up leaning 1 jet size... more restrictive will require more reduction on jetting... didnt really need to change timing.... still jet for max MPH
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Re: Question on tuning after adding race mufflers
[Re: Dart Racer]
#1005277
06/02/11 04:46 PM
06/02/11 04:46 PM
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Joined: Aug 2003
Posts: 43,285 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,285
Bend,OR USA
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Quote:
PSCA just added a muffler requirement, and so I'll be installing the Dynomax Bullet race mufflers. Any thoughts on whether I will need to change the tune with these. Car is currently just a tad on the lean side at sea level.
Itreid a set of 3.5 Bullets on my 1969 Dart GTS 440 powered bracket car years ago at LACR, back to back versus open headers to the Bullets 20 minutes later that car slowed down .110 and 1 MPH adding the bullets versu straight out of the 2 inch Hoker A body fenderwell headers On my street Duster, its a lot faster than the dart was, I use a set of Mganaflow 3 inch x 14 inch lon oveals mounted at the rear bumper and the car only changes .04 and .12 MPH in the 1/8 mile track at madras, OR when I switch from the full exhaust to the open headers, same headers that were on the Dart I highly recommend the straight thruough Magnaflows versus the Bullets based on my personel experiences
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Question on tuning after adding race mufflers
[Re: Cab_Burge]
#1005278
06/02/11 05:10 PM
06/02/11 05:10 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
PSCA just added a muffler requirement, and so I'll be installing the Dynomax Bullet race mufflers. Any thoughts on whether I will need to change the tune with these. Car is currently just a tad on the lean side at sea level.
Itreid a set of 3.5 Bullets on my 1969 Dart GTS 440 powered bracket car years ago at LACR, back to back versus open headers to the Bullets 20 minutes later that car slowed down .110 and 1 MPH adding the bullets versu straight out of the 2 inch Hoker A body fenderwell headers On my street Duster, its a lot faster than the dart was, I use a set of Mganaflow 3 inch x 14 inch lon oveals mounted at the rear bumper and the car only changes .04 and .12 MPH in the 1/8 mile track at madras, OR when I switch from the full exhaust to the open headers, same headers that were on the Dart I highly recommend the straight thruough Magnaflows versus the Bullets based on my personel experiences
Did you do any jetting to see what they were really worth or did you just put them on and ran it
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Re: Question on tuning after adding race mufflers
[Re: MR_P_BODY]
#1005279
06/02/11 05:29 PM
06/02/11 05:29 PM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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4" bullets on my 9 sec 800+ hp hemi run the same as open headers.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Question on tuning after adding race mufflers
[Re: MR_P_BODY]
#1005280
06/05/11 03:04 AM
06/05/11 03:04 AM
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Joined: Aug 2003
Posts: 43,285 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,285
Bend,OR USA
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Quote:
Quote:
Quote:
PSCA just added a muffler requirement, and so I'll be installing the Dynomax Bullet race mufflers. Any thoughts on whether I will need to change the tune with these. Car is currently just a tad on the lean side at sea level.
Itreid a set of 3.5 Bullets on my 1969 Dart GTS 440 powered bracket car years ago at LACR, back to back versus open headers to the Bullets 20 minutes later that car slowed down .110 and 1 MPH adding the bullets versu straight out of the 2 inch Hoker A body fenderwell headers On my street Duster, its a lot faster than the dart was, I use a set of Mganaflow 3 inch x 14 inch lon oveals mounted at the rear bumper and the car only changes .04 and .12 MPH in the 1/8 mile track at madras, OR when I switch from the full exhaust to the open headers, same headers that were on the Dart I highly recommend the straight thruough Magnaflows versus the Bullets based on my personel experiences
Did you do any jetting to see what they were reallyworth or did you just put them on and ran it
put them on and ran it, it was late in the day , after the 4th round so that was the last run of the day for me. They shut time only off right after my run
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Question on tuning after adding race mufflers
[Re: Cab_Burge]
#1005281
06/05/11 03:09 AM
06/05/11 03:09 AM
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Joined: Mar 2003
Posts: 2,524 PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,524
PA
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Just ran quicker with my 3 1/2 bullets and side exit exhasut tonight. 5.96 pass I am alky injected though. Might change a carb tune some.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: Question on tuning after adding race mufflers
[Re: Dart Racer]
#1005282
06/05/11 07:57 AM
06/05/11 07:57 AM
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Joined: Jan 2003
Posts: 5,895 Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,895
Florida
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Quote:
PSCA just added a muffler requirement, and so I'll be installing the Dynomax Bullet race mufflers. Any thoughts on whether I will need to change the tune with these. Car is currently just a tad on the lean side at sea level.
I installed a TTI X-pipe and 3" Dynomax Ultraflow mufflers (the big, oval ones) on my car and picked up over open headers. But that was probably due to the X-pipe. I figure if the mufflers are big enough and not restrictive for your particular combo, you won't slow down.
I believe I did jet down a number or two and also had to take out 60lbs from elsewhere in the car to compensate for the weight of the system. The jetting may have also been influenced by the X-pipe rather than the mufflers.
I may try the smaller, lighter bullet style some time in the future.
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Re: Question on tuning after adding race mufflers
[Re: Locomotion]
#1005283
06/05/11 08:06 AM
06/05/11 08:06 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
PSCA just added a muffler requirement, and so I'll be installing the Dynomax Bullet race mufflers. Any thoughts on whether I will need to change the tune with these. Car is currently just a tad on the lean side at sea level.
I installed a TTI X-pipe and 3" Dynomax Ultraflow mufflers (the big, oval ones) on my car and picked up over open headers. But that was probably due to the X-pipe. I figure if the mufflers are big enough and not restrictive for your particular combo, you won't slow down.
I believe I did jet down a number or two and also had to take out 60lbs from elsewhere in the car to compensate for the weight of the system. The jetting may have also been influenced by the X-pipe rather than the mufflers.
I may try the smaller, lighter bullet style some time in the future.
Myron do you have a pic of your exhaust system by any chance?
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