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Old 09-04-2007, 02:58 PM   #1
revnseven
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Default 1/4 mile mph question

I took my car to the track over the weekend and turned in my best time at 13.6 @99 mph. This mph seem low to me or am I wrong? I have a 02 wagon with uppipe, dp, cat delete, cobb catback, perrin crank pulley, injen long cai, NGK idrium 1 step colder, cobb stage 2 on 91 octane. I know I should be on 93 octane but is hard to find good fuel that won't make the car misfire. So having to put octane booster everytime I fill up. Every thing else is stock except the suspension. I launch the car between 4500 and 5000 and shifting around 6600 rpm and running throw the traps in 4th gear around 5500 rpm. On that pass it went 1.89 60'. I know I should be happy but just confused.

Thanks
Brian
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Old 09-04-2007, 03:00 PM   #2
The Head
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That's about where my mph was at with the same ET (back then).
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Old 09-04-2007, 03:13 PM   #3
revnseven
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My buddys car with about the same engine parts but in a sedan was turning 102 to 103 mph with 13.7's to 13.8's
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Old 09-04-2007, 04:30 PM   #4
Audiosavvy
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I have a Stage 2 bugeye (uppipe, 3" TBE with twin-dump DP, OS tuning through Enginuity, Prodrive springs), and last time out I did 13.385 @ 103.07, at 480ft at 93 degrees on 91 pump gas. I typically average around 13.5-13.6 @ 101-102. My 60ft time is usually between 1.8-1.9. I tried Scotty's Cocktail in my tranny and that helped me shift a little faster and smoother. Also, if it helps, I pull my passenger seat and spare tire when I run, and usually have 2/3 of a tank of gas (gotta have enough to get home) and I keep dry ice on the TMIC while in the staging lanes. If it makes you feel any better, my first few times out, the best I pulled was 13.9 @ 99 on a Cobb OTS map.
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Old 09-04-2007, 04:33 PM   #5
PaulRex
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why is your car misfiring? which octane booster are you using? ive seen orange deposits on my sparkplugs using some octane boosters (NOS ) and i stopped trying that stuff a few years ago.

if your car is misfiring you have some other issue besides bad gas.. and bad gas is very uncommon anyway which leads me to believe you probably need to touch up a few spots with your tune?

On the other hand 13.6 is a great e.t., however your trap speed has room for improvement, like your car is laying over in 3rd and 4th gear or something.

Overall.. NICE DRIVING!
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Old 09-04-2007, 04:47 PM   #6
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Quote:
Originally Posted by PaulRex View Post
if your car is misfiring you have some other issue besides bad gas.. and bad gas is very uncommon anyway which leads me to believe you probably need to touch up a few spots with your tune?

I agree. The best thing I ever did for my car was the open-source tune. The car is much smoother, much more responsive, more torque in the low-end, it's even easier to drive, especially with the AC on (we need it here, it was 109 yesterday ). Even the exhaust note became more defined vs. the Cobb Stage 2 OTS map, although that's just a bonus in my opinion. Like PaulRex said though, 13.6 is nothing to be ashamed of amigo
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Old 09-05-2007, 01:53 AM   #7
revnseven
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Yes it sound silly but about it misfiring due to octane. But i've had this problem since BP went to 91 octane. So i think all the gas around my area is on the bad side. I wish we had a sonoco or mobil station around but none in site. I have just started to use the outlaw octane booster. They was out of the lucas octane booster. I've been trying to get everything else done be for getting the car tuned. The car pull good throw 3rd and 4th but will try to adjust shift point next time out.
Where do you shift and launch at?
I also ice my intercooler while in the staging lanes.
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Old 09-05-2007, 02:49 PM   #8
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Quote:
Originally Posted by revnseven View Post
Where do you shift and launch at?

I've had the best luck launching between 5200-5500, but I don't dump the clutch, and really don't ride it either, I find the catch point and then put my right foot to the floor while letting my left foot up, ALMOST dumping it. When I do it right, I smell no clutch while still getting a smooth, strong launch. With the Cobb OTS map, I shifted at redline, but after the OS tuning (thanks Aaron ), I shift around 6800 (200 RPM lower) because we cranked up the boost a little, and it tapers off like normal up top (stock TD04 falls on its face up top), so I try to spend more time under 6k, where I'm still pulling 19-19.5 pounds. That may not be the best way to do it with the Cobb Stage 2 OTS map, but that's how I do it
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