10-22-2005, 07:57 PM | #1 |
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4.56 Or 4.88?
I went to Cedar Falls Raceway today. I have been there the last three weekends. Last weekend I was running the 4.56 gear. This weekend the only thing I changed was swapping the 4.56 for a 4.88. The weather was great both weekends though there was a head wind of about 10 knots or so today.
I made three passes last weekend with the 4.56s’ and one of them was my best pass ever. Here are the passes from last weekend. LAST WEEKEND FIRST PASS R/T - .504 60’ - 1.445 330 - 4.395 1/8 - 6.848 MPH - 100.97 1000 - 8.986 1/4 - 10.782 MPH - 125.87 SECOND PASS R/T - .520 60’ – 1.483 330 – 4.449 1/8 – 6.898 MPH – 100.65 1000 – 9.028 1/4 -10.811 MPH – 126.65 THIRD PASS R/T - .343 60’ - 1.447 330 – 4.397 1/8 – 6.842 MPH – 100.61 1000 – 8.969 1/4 – 10.754 MPH – 126.51 As you can see, the MPH and ET was better last weekend with the 4.56’s but the 60fts’ were MUCH better this weekend with the 4.88s’. I usually crossed the traps at 7,000 rpm or so with the 4.56’s and today I was crossing about 7,300 to 7,400 or so. What do you think I should do here? Should I swap back to the 4.56 gears or should I keep the 4.88s’ in the car and give them another chance during a day with no headwind? I am kind of wondering if the 4.88’s are too much gear for my set up? My set up only makes good power to about 7,000 rpm. After that, it falls off a cliff. I was hoping the decrease in 60ft time with the 4.88 would help offset what I would lose up top but it doesn’t look too promising. I did manage to get a 10.76@123.93. I guess I am stumped on which way to go. Thanks in advance to all who reply. THIS WEEKEND FIRST PASS R/T…...130 60’……1.489 330…...4.503 1/8……6.994 MPH…98.77 1000…9.141 1 / 4….10.950 MPH…122.73 SECOND PASS R/T…...407 60’……1.423 330…...4.399 1/8……6.876 MPH…98.82 1000…9.012 1 / 4….10.823 MPH…123.06 THIRD PASS R/T…...171 60’……1.409 330…...4.391 1/8……6.868 MPH…98.12 1000…9.010 1 / 4….10.822 MPH…123.29 FOURTH PASS R/T…..-.121 60’……1.437 330…...4.435 1/8……6.914 MPH…98.37 1000…9.055 1 / 4….10.868 MPH…123.17 FIFTH PASS R/T…...095 60’……1.413 330…...4.368 1/8……6.835 MPH…99.11 1000…8.963 1 / 4….10.767 MPH…123.93
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Dart 360 (ADPerformance), FTI AFR 225, FTI Edelbrock Victor EFI, FTI Cam, Pro M 80 MM (42lb injectors), KOOKS Longtubes 1 7/8 inch to 2 inch to 3.5 inch collectors, Pro Motion TKO, FMS 4.88, Global West Suspension, ET Drags, TwEECer RT 10.74 @ 127.68 (best so far) THANKS : Ed Curtis www.flowtechinduction.com, Dave of www.jdsperformance.com, Walt of Pro Motion Transmissions, Jack of www.musclemotors.com, Brian of www.adperformance.com and Matt of SPEC clutches (www.specclutch.com) |
10-22-2005, 09:01 PM | #2 |
5.0 Block/Walnut Cracker
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Re: 4.56 Or 4.88?
How tall of a tire 26 or 28?
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10-22-2005, 09:40 PM | #3 |
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Re: 4.56 Or 4.88?
28 inch tire Dale.
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Dart 360 (ADPerformance), FTI AFR 225, FTI Edelbrock Victor EFI, FTI Cam, Pro M 80 MM (42lb injectors), KOOKS Longtubes 1 7/8 inch to 2 inch to 3.5 inch collectors, Pro Motion TKO, FMS 4.88, Global West Suspension, ET Drags, TwEECer RT 10.74 @ 127.68 (best so far) THANKS : Ed Curtis www.flowtechinduction.com, Dave of www.jdsperformance.com, Walt of Pro Motion Transmissions, Jack of www.musclemotors.com, Brian of www.adperformance.com and Matt of SPEC clutches (www.specclutch.com) |
10-23-2005, 08:30 AM | #4 |
3v's are slow
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Re: 4.56 Or 4.88?
I think you should go back to a 4.56. Seems like 4.88 is to much for your setup
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10-23-2005, 06:56 PM | #5 | |
5.0 Block/Walnut Cracker
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Re: 4.56 Or 4.88?
Quote:
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10-23-2005, 07:28 PM | #6 |
Nothing new here
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Re: 4.56 Or 4.88?
I would tend to agree that if your crossing at 7300-7400, and you loosing power after 7000, I too would think the 4.56's are the better choice.
Plus look at your 1/8 mile speeds, looks like your already stating to loose some at that point.
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10-23-2005, 07:30 PM | #7 |
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Re: 4.56 Or 4.88?
I have been thinking about this and one of the things I noticed is I did run within .001 of my best time and this was with a set of gears that I have NEVER run with. I think I need to give them some more seat time before I dump them.
I am going to adjust my shift points by 150 rpm or so and see if that helps keep the car pulling through the traps. I think it might help me. If the car can 60 ft in the low 1.40s' all I have to do is get it in 3rd gear by the 1/8th or so and I can get those mid 10's with these gears. I am not going to sell the 4.56s' just yet but I am not going to give up on the 88s' with just five passes with them under my belt either. Thanks for the replys everyone. I appreciate it.
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Dart 360 (ADPerformance), FTI AFR 225, FTI Edelbrock Victor EFI, FTI Cam, Pro M 80 MM (42lb injectors), KOOKS Longtubes 1 7/8 inch to 2 inch to 3.5 inch collectors, Pro Motion TKO, FMS 4.88, Global West Suspension, ET Drags, TwEECer RT 10.74 @ 127.68 (best so far) THANKS : Ed Curtis www.flowtechinduction.com, Dave of www.jdsperformance.com, Walt of Pro Motion Transmissions, Jack of www.musclemotors.com, Brian of www.adperformance.com and Matt of SPEC clutches (www.specclutch.com) |
10-24-2005, 08:32 AM | #8 |
The Kocky One
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Re: 4.56 Or 4.88?
I agree, give a little more time/more testing before swapping back out...
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10-26-2005, 03:51 PM | #9 |
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Re: 4.56 Or 4.88?
Swap back. Change some suspension stuff to get the 60' where you want it
or spray it Let your motor do what it needs to do.
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