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Re: Please rate time slip for street car
[Re: dfsmopars]
#1509319
09/30/13 08:14 PM
09/30/13 08:14 PM
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Joined: Feb 2005
Posts: 4,310
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,310
Prospect, PA
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You are getting a lot of conflicting info here. Some say gear and converter, others say "more power".
Your time slip actually points to one on these as the place to focus if you want better ets and mph. Quite simply, it is not the gear/converter. Unless of course there is something wrong with the converter that it is eating hp (possible).
When you look at the generally accepted formula for dissecting quarter mile data, it shows that if your had a perfect racing suspension (this includes gear and converter) you best possible et is about 13.9.
These empirically derived formula are pretty reflective of reality. However, certain conditions can alter the conclusions drawn. These conditions include motor related problems that cause the motor to be down on power at the end of the track (i.e. skewing the et/60" times relative to the mph), examples include ignition cut out, or fuel starvation. When power, or mph seem down, always check that you don't have a fuel delivery problem.
IIRC, your post asked what we thought about your quarter mile performance relative to what you have, and not necessarily what is need to go quicker/faster. I still maintain that you are not that far off and hold to my previous suggestions to make what you have perform better. My sense from your post was."..what should it run with what I have", not "...what could it run if I throw a bunch of money/changes at it".
Also, like someone else said, wind and atmospheric conditions can have a very measurable effect on performance.
Tell us what day and track you were at.
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Re: Please rate time slip for street car
[Re: BSB67]
#1509323
10/01/13 07:41 AM
10/01/13 07:41 AM
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Joined: Aug 2007
Posts: 2,356
Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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Quote:
You are getting a lot of conflicting info here. Some say gear and converter, others say "more power".
Your time slip actually points to one on these as the place to focus if you want better ets and mph. Quite simply, it is not the gear/converter. Unless of course there is something wrong with the converter that it is eating hp (possible).
When you look at the generally accepted formula for dissecting quarter mile data, it shows that if your had a perfect racing suspension (this includes gear and converter) you best possible et is about 13.9.
These empirically derived formula are pretty reflective of reality. However, certain conditions can alter the conclusions drawn. These conditions include motor related problems that cause the motor to be down on power at the end of the track (i.e. skewing the et/60" times relative to the mph), examples include ignition cut out, or fuel starvation. When power, or mph seem down, always check that you don't have a fuel delivery problem.
IIRC, your post asked what we thought about your quarter mile performance relative to what you have, and not necessarily what is need to go quicker/faster. I still maintain that you are not that far off and hold to my previous suggestions to make what you have perform better. My sense from your post was."..what should it run with what I have", not "...what could it run if I throw a bunch of money/changes at it".
Also, like someone else said, wind and atmospheric conditions can have a very measurable effect on performance.
Tell us what day and track you were at.
The day was sunnny and at the time of the run it was about 78° and the RH was pretty low at about 60%. There was a slight cross wind coming across from right to left.
Seems the car has something left on the table as it is built and it'd be nice to find the optimum set up with the equipment currently installed then move on to better things down the road. Gears and carb are definitely in its future but not right now. Life demands more thoughtful spending these days. 
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Please rate time slip for street car
[Re: dfsmopars]
#1509324
10/01/13 09:38 AM
10/01/13 09:38 AM
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Joined: Oct 2011
Posts: 318
Fort Collins, Colorado
CoDart
enthusiast
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enthusiast
Joined: Oct 2011
Posts: 318
Fort Collins, Colorado
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Heres my setup which is very similar to yours: 3450lb Dart(with me) Magnum 360 with 9.5 compression, RHS indy heads, 228/232 .540 lift cam, 904 3500rpm stall, 3.91 gears,275/60/15 et radial tires. 85 octane gas. Ran a 13.8@98mph(1.91 60ft). Keep in mind this was at 5500ft above sea level and was 8400 DA that day, this would equal out to a high 12 second car at sea level. With your set up a larger carb would help out. I went from a 600cfm edelbrock to a 950DP holley and it went from 95mph to 98mph instantly without no tuning or changes on anything else. That change is about 25-30hp gain by a simple carb swap. My timing is set at 38* advanced. With a few changes to your combo you will be seeing low 14s high 13s 
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Re: Please rate time slip for street car
[Re: dfsmopars]
#1509325
10/01/13 01:33 PM
10/01/13 01:33 PM
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Joined: Feb 2003
Posts: 10,198
Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,198
Someplace you aren't
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The 60 foot is good to get into the 13's with. The ET and MPH are indicating the engine is not producing at the end of the run. While the ignition might not be perfect, it is more likely fuel that needs attention.
I want my fair share
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Re: Please rate time slip for street car
[Re: Triple Threat]
#1509329
10/01/13 05:25 PM
10/01/13 05:25 PM
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Joined: Sep 2004
Posts: 22,873
Chicken coop
dustergirl340
Chicken Little
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Chicken Little
Joined: Sep 2004
Posts: 22,873
Chicken coop
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Quote:
I daily drove my dart for years with the 340 and a 4150 750. The car ran 12.30 @107 and would get 15MPG @3600# with 3.91 gears and 26" tire.
Mine runs 12.40's at 107 with a 340, same carb, same gears, and 28" tall tire and gets 14MPG.
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Re: Please rate time slip for street car
[Re: Triple Threat]
#1509333
10/01/13 06:01 PM
10/01/13 06:01 PM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
Quote:
Quote:
Who has a 750 DP laying around?
Throwing street use out the window?
A DP is the last carb you need on the street. It'll suck fuel like no tomorrow. Every time the pedal moves they shoot fuel on both sides.
Wrong... The linkage is still progressive. Stay out of the secondaries and you'll be fine. I daily drove my dart for years with the 340 and a 4150 750. The car ran [Email]12.30@107[/Email] and would get 15MPG @3600# with 3.91 gears and 26" tire. BUT, I dont think the carb is the issue, its probably multitude of things making this a mismatched/ underperforming combo.
The OP needs to weigh that thing before we get into too much detail. Yes MPH seems low, but that car could be pretty heavy which would explain most of that.
BINGO!
Drive a DP with any sense of what you are doing and mileage is not an issue. If you have a lead foot and always mat it from a light, mileage will stink. It's all in the right foot.
13.60-104, 20 mpg on the highway with a 4779 750dp. It got 14-15 around town...
My guess, OP needs to fix the initial timing, bushing, springs FIRST! Don't do anything else until you get that sorted out.
Vacuum carbs easily give up 2 tenths at the track compared to a DP.
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Re: Please rate time slip for street car
[Re: BSB67]
#1509337
10/01/13 09:58 PM
10/01/13 09:58 PM
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Joined: Aug 2007
Posts: 2,356
Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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Quote:
Still helpful to give us the track and date, and car weight when you get it.
I'll get the weight this week. The run was on 9/28/13 at Mountainpark Dragway in Clay City, KY at about 4:00 PM.
Keep in mind the dist is fully electronic. No weights or manual adjustments. Everything is controlled by pods.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
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