1/8th mile 5/16/08
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1/8th mile 5/16/08 - 5/16/2008 11:47:28 PM
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The stang II
Team MF Member #005
Posts: 475
Joined: 9/26/2006
Status: offline
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(Cliff notes at bottom, Just read the first 2 paragraphs then look at cliff notes)
Well as you may recal, my car caught on fire on christmas day and turned my carburetor into charcol. It was a 600 cfm Holley double pumper. Before that the car went 8.8 in the 1/8th with the 600 cfm carb.
So I bought a new 570 cfm holley street avenger vaccum secondary. Which I thought would make my car 2 tenths slower due to the vaccum secondary.
The entire time with my new carb I was thinking it was slow and not as powerful. I even raced a STOCK '94 GT (from a 60 roll) and lost. And my friend (one I raced) knew I went that quick and now thinks his car is faster than mine due to the change and also in 30* weather (imo bad for my carburetor too cold)
So I bring my car to the 1/8th tonight to see how much "slower" my car is with the smaller carb.
I set my bald street tire (right rear, one tire fire) to 28psi and bump up my fronts to 45.
First pass of the night yields a 9.06 with a 2.5 60ft (i spin sooo bad)
Second pass yields a 9.25 with a 2.4 60 ft
Third pass yields a 9.0 again with a 2.5 60 ft
Now before I shock you guys with the last run, I couldn't get my car to hook at all. It was 75* when these 3 passes went down so a little loose the track was. But I tried with my launches at 2 grand rpm dump the brake and mash on the gas and WOT through the tire spin= BAD
Then I try when it spins get out of the throttle and then get back on it again= SLOW
So bracket racing just started, on my 3rd run and I won my first race in my 9.0-10 second bracket
I was kind of mad since I KNEW my car had a sub 8 second pass in it traction permitted, so I lower my pressure down to 24 psi and the weather was now in the 50's so I knew the track tightened up a bit so my hopes were high.
At this point I could care less if I break up and I decide to not let up on this run.
I launch at 1500 rpm and go full throttle to my best 2.3 60ft and make my way to an 8.86!!!
I caught DECENT traction but still spun quite a bit (obviously) and wouldn't you know just as fast as my previous best.
Ok now my friend with that STOCK '94 GT thinks he can go 8.5-8.7 because he "beat" me. He doesn't realize going from a dig is a lot harder than just flooring it. PLUS my car felt like it pulled the hardest it ever has. the stock 3.00 gears is killing me, one tire fire is killing me! And at the highway, his stock 3.27 helped ALOT from a 60 roll.
Someone tell me if he runs an 8.6 in the 1/8th he has to have gears or something done to it that he doesn't know. I have seen under his hood and it's stock to the paper filter.
-CLIFF NOTES-
First pass 9.0
Second pass 9.2
Third pass 9.0
Fourth pass 8.8!!
_____________________________
-Rebuilt 302
-Hooker Super Competition headers w/ flowmaster 10 series muffs
-Edelbrock Intake Manifold
-4 bbl Holley carb
Fastest 1/8th mile: 8.8
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RE: 1/8th mile 5/16/08 - 5/17/2008 12:14:13 AM
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FuzzyDiceRule
Posts: 2344
Joined: 6/27/2005
Status: offline
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a stock Five liter fox runs ~9.5 stock, and IIRC stock 5 liter SN95s are slower, so if hes stock, hes teh boned
_____________________________
1992 Mustang GT: 5.0, 5 Speed
1969 Mach 1: 351, 5 speed
1971 Chevelle SS 454; 454, TH400 Auto
454ci club- member #2
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RE: 1/8th mile 5/16/08 - 5/17/2008 7:15:26 AM
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bluebeastsrt
Posts: 5155
Joined: 6/22/2006
Status: offline
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Sounds like you have the little relic moving pretty good.
_____________________________
Roll racing isn''t racing. Its just 2 retards speeding together!
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RE: 1/8th mile 5/16/08 - 5/17/2008 10:13:26 AM
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67mustang302
Posts: 5452
Joined: 4/21/2007
Status: offline
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I'm running the 570 SA on my 302 as well, it's a pretty decent little street carb for the money. I'm ALWAYS telling people that they'd be much better off with smaller carbs, firstly because a carb's job is to meter and atomise fuel, not get air into the engine(in that regard smaller carbs have an advantage over larger carbs). Secondaly, most engines are actually pumping FAR less cfm than most people think. The extra 5-10 peak hp gained from a slightly less restrictive carb is NOT worth all the average power that's lost from worse metering. And I actually calculated the true cfm my engine was pumping at 6,500rpm, and it came out to around just under 500cfm of real airflow, which means on a 570cfm carb(rated at 1.5" Hg) I'm prolly only pulling 1-1.1" Hg intake vacuum at 6,500rpm. Granted though, power produced also depends on the design of the carburetor as well.
_____________________________
Who cares how much horsepower it has, all that matters is how fast it goes!
Best run 13.23 at 106.97mph with a 2.183 60'
Times from before tune and driver mod.
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RE: 1/8th mile 5/16/08 - 5/18/2008 12:57:48 AM
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67mustang302
Posts: 5452
Joined: 4/21/2007
Status: offline
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Vacuum secondary carbs are a lot more forgiving too, and with a double pumper you really have to have the pumps tuned right. It does leave the line nicely though.
_____________________________
Who cares how much horsepower it has, all that matters is how fast it goes!
Best run 13.23 at 106.97mph with a 2.183 60'
Times from before tune and driver mod.
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