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Old 11-05-2009, 09:09 AM   #1
streetstang88gt
 
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Default Help! Going through traps in middle of 4th rather than top of 3rd?!?!

Went to the track last night since putting a new cai, longtubes and x pipe, tune up and underdrives...Everytime ive gone to the track before, i was going the the traps at 5500rpm in 3rd gear with my 3:55s. Last night i put it into 4th about 3/4 track and lost 3-5mph running very disappointing times..clutch isn't slipping or anything....i am assuming its the tranny but i just found it odd...any help would be greatly appreciated!!!
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1988 Mustang GT- 302ci, GT40 tubular upper and lower, GT40P heads mild port & polish, 1.6rr, B303, BBK fenderwell c/a, 73mm C&L, BBK Longtubes, BBK o/r X, 40 series Flows, King Cobra clutch, Pro 5.0 shifter, 3:55 gears, eibach springs, KYB shocks and struts, etc...
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Last edited by streetstang88gt; 11-05-2009 at 09:16 AM.
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Old 11-05-2009, 12:59 PM   #2
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when that happens to me its usually cuz i spun out off the line and shifted out of first way too early. did you get multiple runs in or just the one? if just 1 run i wouldnt worry about it, probably driver error.
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Old 11-05-2009, 02:23 PM   #3
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What rpm are you shifting at?
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13.20's with 2.25-2.30 60's, 40+ year old suspension sucks!
Best trap 107.11mph, we'll see what the new intake/carb setup does.
12.80 at 110.5mph NHRA DA corrected
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Old 11-05-2009, 02:54 PM   #4
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reguardless if it were driver error or not, i still wouldn't ever hit 4th...i did 3 runs and all were the same...still in 4th...my dumbself was still driving it..haha..but i dont know how it could be the tranny, that would be the rear end more so right?! I am shifting at 5500..
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Old 11-05-2009, 03:00 PM   #5
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You should probably be shifting at more like 6,000 with your setup, maybe even a tad more. As long as you have good pushrods and valve springs it shouldn't be a problem. Your power probably peaks at 5,500, but it doesn't fall off instantly.
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Who cares how much horsepower it has, all that matters is how fast it goes!

13.20's with 2.25-2.30 60's, 40+ year old suspension sucks!
Best trap 107.11mph, we'll see what the new intake/carb setup does.
12.80 at 110.5mph NHRA DA corrected
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Old 11-06-2009, 03:04 AM   #6
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You've done mods AND tried a different driving style. 2 huge variables here.

Go back and experiment with hanging onto 3rd vs switching to 4rth. After a back to back comparison you will have your answer.
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Old 11-06-2009, 09:24 AM   #7
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i cant is what im sayin....man i must not be explaining it right....i bounce off the rev limiter at 3/4 track in 3rd...i have no choice...
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Old 11-06-2009, 09:26 AM   #8
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technically i dont have the pheads on yet...there still in the machine shop...there done i just owe him about $200 more..lol
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Old 11-09-2009, 08:52 AM   #9
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has anyone experienced same issue...im hoping my tach is reading wrong but I don't know if its my rearend or not....i definately know what my car sounds like at high rpms....im just lost with it...i am about to go 410's as well..
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1988 Mustang GT- 302ci, GT40 tubular upper and lower, GT40P heads mild port & polish, 1.6rr, B303, BBK fenderwell c/a, 73mm C&L, BBK Longtubes, BBK o/r X, 40 series Flows, King Cobra clutch, Pro 5.0 shifter, 3:55 gears, eibach springs, KYB shocks and struts, etc...
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