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car goes quicker after a few runs???
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car will run close to the same number maybe three passes in a row then it will pick up .06 to .08 it's a new motor and a different carburetor. Could this be a carburetor issue? It's a quick fuel 1050 Dominator 3 circuit. everything else is the same.. 60 foot times are all fairly close.. last weekend for example. 9.21 9.21 9.24 9.16... the air density went up like 300 foot the whole day. Its been doing this for a while

This message has been edited. Last edited by: mopar man,
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
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Try another carburetor and see if you get the same erratic results. I'm certain that you have gone over the fuel delivery system to eliminate any problems, the next item is possibly the converter.

Good luck

Bob
 
Posts: 2119 | Location: Lakeside, Ca | Registered: February 15, 2003Reply With QuoteReport This Post
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yes,3 year old magna fuel 500 pump and regulator. just got the converter back from A-1 40 passes ago ..trying a diff carb is probably a good and easy place to start
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
DRR Sportsman
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Does it maintain the quicker time for the rest of the race? Or go back to the previous slower times?


Jeff McClure
 
Posts: 126 | Location: Texas | Registered: December 02, 2006Reply With QuoteReport This Post
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I don't know I seem to always breakout and lose so I'm not sure
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
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Does it seem to happen in the same lane? The reason I'm asking as I have seen an experienced this. It was always left lane. The tracks beams were off and if you didn't stage in same location each time you hung in the beams longer and slow reaction quick 60' quick et but same mph as slow pass. Think it has to do with crown in track when they set roll out or wiring issues. Look at your time slip and see if these things happen it may not be your car but the tracks timing setup.


Jeff McClure
 
Posts: 126 | Location: Texas | Registered: December 02, 2006Reply With QuoteReport This Post
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nope either lane
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
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Do monitor trans temp? When it picks up is after hot laping it?
 
Posts: 23 | Location: chicago | Registered: July 28, 2013Reply With QuoteReport This Post
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yup, never gets over 180
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
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What part of the track are you picking up the ET?


Mark Yeager
 
Posts: 1194 | Location: Hollister,CA | Registered: April 06, 2004Reply With QuoteReport This Post



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quote:
Originally posted by mopar man:
yup, never gets over 180

180 is hot unless you are round robin racing in the late rounds.


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Posts: 8562 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
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Calculate your split times and really hone in on where its picking up (between which cones), this will help point to the issue of what could be causing it.


Ryan Fasano

2014 Byron Overall Track Champion
Byron's actual elevation is 730' because that matters more than winning anything ever....
 
Posts: 626 | Location: wisconsin | Registered: January 08, 2008Reply With QuoteReport This Post
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quote:
Originally posted by Mark Yeager:
What part of the track are you picking up the ET?

gaining
in the first 330ft. 9.21--9.21--9.24--9.16
60 ft 1.313-1.313-1.321-1.303
330 ft 3.832-3.834-3.859-3.793

the 9.16 pass gained .01 60ft and .03 more by the 330ft..so .04 quicker by the 330ft and by then the DA was 300 higher then the first pass
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
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quote:
Originally posted by 1320racer:
quote:
Originally posted by mopar man:
yup, never gets over 180

180 is hot unless you are round robin racing in the late rounds.


yes thats as hot as it has ever got. after a few rounds driving back but it cools down quickly.. mostly 140-060
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
DRR Sportsman
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How do you shift the car? Time,RPM or by hand? Powerglide?


Mark Yeager
 
Posts: 1194 | Location: Hollister,CA | Registered: April 06, 2004Reply With QuoteReport This Post
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You would benefit from calculating the split times. I think you just posted the incrementals. Calculate the splits and then trend them to the weather, that should tell you a lot about your combo. or you can PM me and we can speak more about it.


Ryan Fasano

2014 Byron Overall Track Champion
Byron's actual elevation is 730' because that matters more than winning anything ever....
 
Posts: 626 | Location: wisconsin | Registered: January 08, 2008Reply With QuoteReport This Post
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What type of oil do you use?
 
Posts: 22 | Location: south carolina | Registered: November 07, 2008Reply With QuoteReport This Post
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kendall 20-50
 
Posts: 27 | Location: cedar rapids, iowa | Registered: September 16, 2009Reply With QuoteReport This Post
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After looking at the split times your variance is occurring early in the run. Those early time variances become greater as the run continues. So look at the items that can effect those early (0 to 60 and 60 to 330) split time variances, Fuel pick up, converter, trans fluid temperature, tire slippage, etc.

Good luck......

Bob
 
Posts: 2119 | Location: Lakeside, Ca | Registered: February 15, 2003Reply With QuoteReport This Post
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It's tough to say without the entire slips, and even entire slips for multiple days of this happening.

From what you've shared so far, all of the numbers trend together so it doesn't look like anything too strange is happening. From what we can see here, the car is making different HP on each pass.

Does the MPH trend according to the ET also?

Do you have any examples where the 60' was slower or the same as the prior pass, but it was still much quicker by 330?


Tony Leonard
 
Posts: 2329 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post



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