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  #1  
Old 01-17-2022, 01:47 PM
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Default Exhaust testing
A little real world test results from the weekend.
Since I am in the long process of updating my race car
I am now racing my 69 Firebird streetcar.
We replaced the 30-year-old 2.25" exhaust with turbo mufflers and a H pipe
with 3" pipe, Magnaflow's and a X pipe.

Previous best with the car was 12:38 to 12:43 at 106/107 mph
With approximately the same conditions this last weekend the
car ran 12:00,12:02,12:05,12:08 at 108/111 mph.
The head wind at times was the reason for the car slowing down.

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Old 01-17-2022, 02:05 PM
ta man ta man is offline
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Thanks for sharing! Nice you are at 12.0's now!

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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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  #3  
Old 01-17-2022, 03:24 PM
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Nice, heading for the 11's. Thanks for the info

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Old 01-17-2022, 04:33 PM
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Old 01-17-2022, 04:42 PM
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Old pipes and mufflers with rust scale on the inside eats into flow numbers by a surprising amount!

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  #6  
Old 01-17-2022, 04:48 PM
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Thanks for sharing! Nice you are at 12.0's now!
Yeah I made the last pass after the wind died down looking for a 11 second pass.
Ironically it was 12.000.

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  #7  
Old 01-17-2022, 04:50 PM
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Old pipes and mufflers with rust scale on the inside eats into flow numbers by a surprising amount!
We don't get a lot of rust in Vegas...lol

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Old 01-17-2022, 04:53 PM
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Yeah I made the last pass after the wind died down looking for a 11 second pass.
Ironically it was 12.000.
It will come..I'm interested in your 60 foot times and your overall combination.

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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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  #9  
Old 01-17-2022, 05:35 PM
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Pretty impressive that the old exhaust system ran 12.30's..........wow

I too, wonder what your engine/trans/gear combo is....

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  #10  
Old 01-17-2022, 05:46 PM
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That is a very impressive gain!

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  #11  
Old 01-17-2022, 06:42 PM
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Nice gains…..

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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile
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  #12  
Old 01-17-2022, 07:12 PM
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It will come..I'm interested in your 60 foot times and your overall combination.
60's range in the mid to high 1.6 range.
Car is a 1969 Firebird weighs 3675 with me in it,389 solid flat tappet cam, 64 casting heads,
T400 with 2.75 gear,0riginal 8.2 with 3.90 gear, M/T 9" pro bracket radial tires and
Cal Tracs.

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Old 01-17-2022, 10:35 PM
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Originally Posted by racegto65 View Post
60's range in the mid to high 1.6 range.
Car is a 1969 Firebird weighs 3675 with me in it,389 solid flat tappet cam, 64 casting heads,
T400 with 2.75 gear,0riginal 8.2 with 3.90 gear, M/T 9" pro bracket radial tires and
Cal Tracs.
Damn! Nice! What convertor?

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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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  #14  
Old 01-18-2022, 12:20 AM
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Damn! Nice! What convertor?
The convertor is a hand me down from another racer. Stalls about 3400 rpm
in this combo. This is a footbrake car launching at 2200 rpm and shifting
at 5800.

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Old 01-18-2022, 07:55 AM
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Great results and really nice combo

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69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60'
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