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full exhaust

Post  glenevans on May 3rd 2013, 3:11 pm

Heading out to first race of season here in Utah. This year I have full exhaust hooked up (3" dual w/ dynomax mufflers) behind my 545. Be interesting to see performance difference from open headers. Last May ran 11.13 - 11.15 @121.5 mph

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Re: full exhaust

Post  IDT-572 on May 3rd 2013, 3:39 pm

If they are bullits you have about as good of free flowing exhaust as you can get. I'm sure it will pick up some if it is dueled all the way out the back because of the bends. My guess 1.5 tenths
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Re: full exhaust

Post  glenevans on May 3rd 2013, 3:47 pm

I have them turn down in front of axle. They are the "angled " straight thru. I don't think they are the bullet mufflers. I also added small block front coil springs and tightened the rear shocks . Should be fun. Smile

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Re: full exhaust

Post  IDT-572 on May 3rd 2013, 4:32 pm

glenevans wrote:I have them turn down in front of axle. They are the "angled " straight thru. I don't think they are the bullet mufflers. I also added small block front coil springs and tightened the rear shocks . Should be fun. Smile

Keep us posted................
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Re: full exhaust

Post  glenevans on May 4th 2013, 12:36 am

Just got back (early red light Mad ), car slowed down to run 11.27, 11.29 @ 118 - 119 mph. Never went above 120. About where it runs in 99* July weather.

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Re: full exhaust

Post  IDT-572 on May 4th 2013, 12:38 am

Jetting time Twisted Evil
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Re: full exhaust

Post  glenevans on May 4th 2013, 1:31 am

Running 83 front jet, 90 rear (1050 , non-dommy 4150). Try 81 88 ???

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Re: full exhaust

Post  glenevans on May 4th 2013, 1:35 am

4400 feet elevation.

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Re: full exhaust

Post  4thHorseman on May 7th 2013, 2:31 pm

Yeah I'd try down jetting like you said and watch the mph to see if it picks back up. Was the 60' any better or worse than before?

I'd expect it to actually slow down a tad as it did from open headers to full dual even with quality mufflers.
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Re: full exhaust

Post  glenevans on May 8th 2013, 11:16 pm

60' did slow a bit. I pulled a couple plugs and they were noticeably darker than usual. Went two sizes leaner main jets, three on idle and high speed bleeds. Next outing is the may 17 , see how it goes Smile .

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Re: full exhaust

Post  glenevans on May 8th 2013, 11:21 pm

Also balanced front and rear tires, had vibration around 1000' mark. Was shakin' pretty hard.

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