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Old 10-31-2005, 02:09 PM
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1/4 mile with low mph

I ran my car at the track. I ran my first pass at 10.76 at 114mph

To me it seems that the Mph is pretty low for that time, what causes that? The 1/4 mile calculators estimate something closer to 127mph. I think my 60ft times were around 1.43

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Old 10-31-2005, 02:39 PM
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All that means is that all your time is made up early on. I would say you have a lower than normal gear or more torque than you know what to do with. If you plan to bracket race the car you have that in your favor, nobody would know how to estimate themselves. My current set up has 3.08 gears an all my time is in the top end. I usually get caught around half track and really pick up on the top. Kinda fun to watch though.
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Old 11-03-2005, 06:01 AM
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What are some things that can be done to bring up my MPH? Or should I just continue working on getting my time down?
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Old 11-03-2005, 06:19 AM
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What was your 1/8 mile ET & MPH? Also, what gear and tire size do you run?

Does it feel like it is falling off on the top end. Maybe a fuel starvation issue?

I did a comparison of a few cars to see the factor between 1/8 and 1/4 mile ET and MPH. Most the cars listed here are N/A without power adders.
http://www.edgesz28.com/edgesZ28/et.htm

Ed www.edgesz28.com


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Old 11-03-2005, 06:35 AM
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I have the time slip at home, but I think it was 7 somthing in the 1/8. I'll look tonight to be sure.
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Old 11-03-2005, 06:47 AM
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what rear gears are you running?

How tall are the tires?

What rpm are you going through the traps?
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Old 11-03-2005, 06:53 AM
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3.89:1 detroit locker
MT 28x13.5 street ET's
First shift was a little too soon at 6000
second shift was at 6800
went through finish at 6400
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Old 11-03-2005, 07:26 AM
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"quickest" wins! AND IT IS A HELL OF ALOT LESS braking force and distance to stop from 114mph than it is at 130mph.....

need lots more detail on the car (motor/cam/tranny/gears etc.) to offer any suggestions.

agree with the above post, you gotta kinda' choose if you want to win the race early with "quick" (catch me if you can, my choice) or late with "speed" (I'm gonna blow your doors off top end) and that is what makes it fun

Hey! Your in the 10's.....be happy
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Old 11-03-2005, 07:49 AM
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408ci windsor
4" stroke 6.20" rods (1.55 rod ratio)
10.68:1 compression
Rings gapped .024 /top ring .350 low (made for nitrous havent run it yet)
Heads Aluminum 215cc runners, 2.08/1.60 64cc chambers
flowed cfm around 285/210 @ .500
1-3/4 headers 3"exhaust down to 2.5 for flowmasters(running full exhaust)
Cam Hyd roller - 294/300 (242/248) .576/.600 110 ls
Trans Full roller C4, 9.5" supposed to be a 4000stall probably only get 3300
Lightend drums and Manual Valve body.
Ford 9" 3.89:1 gears with detroit locker
Tires MT's 28" 13.5 wide
Total weight at the moment is 2580 with my big butt in it.
___________

So you basically saying dont worry about the mph?
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Old 11-03-2005, 09:05 AM
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EXACTLY. Which is faster -- 10.76 @ 114 mph or 10.83 @ 120 mph??
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Old 11-03-2005, 10:02 AM
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Quote:
Originally Posted by farna
EXACTLY. Which is faster -- 10.76 @ 114 mph or 10.83 @ 120 mph??

One is faster, the other is quicker.......
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Old 11-03-2005, 10:16 AM
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I'm going back to the track this saturday. Any suggestions before I go? Im bringing my carb kit, so planned on playing with some different jettings. Right now the timing is set to 12degrees at 1000rpm and 34 total advance. Any ther idea's? I havent used the nitrous yet but with it I want to get into the 9's, I'm just trying to tune things up before I use it.
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Old 11-03-2005, 10:21 AM
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I figure, since you are going through the traps at 6400, you aren't going to get much more speed out of it............wonder if your torque converter is slipping?
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Old 11-03-2005, 10:33 AM
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How do I tell if its slipping?
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Old 11-03-2005, 12:34 PM
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yeah, your slippin' about 10% to much......28" tire with 3.89 gears at 6500rpm = 139 mph if all is perfect, (139x.90%=125mph= "real world")

28" tires with with 3.89 gears at 5500 rpm = 117 mph if perfect, close to your 114mph

so your slippin approx 1000 rpm in the tranny at top end top.....

with as much torque and HP as you have beatin' on those poor C-4 bands it not to surprising

??? You are using "Type F" tranny fluid only in the C-4 ???? if not that can cause the slippage

Last edited by red65mustang; 11-03-2005 at 12:55 PM. Reason: add a line
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