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wrapping out 3rd in the 1/4?

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Old Oct 20, 2008 | 01:01 PM
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Default wrapping out 3rd in the 1/4?

This past Friday I took a trip out to the track and only made two passes before deciding to call it a night due to the fact that track prep was horrible and no one was hooking AND I was banging on the limiter due to wrapping out 3rd before the end of the 1/4 (by a couple hundred feet).

Ive been reading and searching all weekend on the solution and am under the impression that I can extend my gearing by going with a taller tire (28"). Is this the easiest/best/correct solution?

The car is stock cubes, forged internals, 5.3L 2.5 heads, 228/232 .571/.588 113LSA cam. full bolt-ons.

Drivetrain is FLT LVL5 tranny, Yank 3500/2.5str, 3.73s. Tires are 275/40/17 Nittos

I downloaded the tune from my VCM even though the tuner said it was locked (not sure if this means its not) and see that the shiftpoints for 1->2 and 2->3 are set for 5200 which equates to 6000 on the scanner. 3->4 is set at 8160 which I believe is set so that I stay in 3rd through the 1/4.
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Old Oct 20, 2008 | 03:57 PM
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Originally Posted by my2kTA
This past Friday I took a trip out to the track and only made two passes before deciding to call it a night due to the fact that track prep was horrible and no one was hooking AND I was banging on the limiter due to wrapping out 3rd before the end of the 1/4 (by a couple hundred feet).

Ive been reading and searching all weekend on the solution and am under the impression that I can extend my gearing by going with a taller tire (28"). Is this the easiest/best/correct solution?

The car is stock cubes, forged internals, 5.3L 2.5 heads, 228/232 .571/.588 113LSA cam. full bolt-ons.

Drivetrain is FLT LVL5 tranny, Yank 3500/2.5str, 3.73s. Tires are 275/40/17 Nittos

I downloaded the tune from my VCM even though the tuner said it was locked (not sure if this means its not) and see that the shiftpoints for 1->2 and 2->3 are set for 5200 which equates to 6000 on the scanner. 3->4 is set at 8160 which I believe is set so that I stay in 3rd through the 1/4.


Converter slippage, trans going out? Someting doesnt sound right, I mean even on a 26 inch tall tire, youre 3rd gear should top out around 123 mph or so on a stock size tire.
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Old Oct 20, 2008 | 06:16 PM
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Originally Posted by BADD SS
Converter slippage, trans going out? Someting doesnt sound right, I mean even on a 26 inch tall tire, youre 3rd gear should top out around 123 mph or so on a stock size tire.
Trans has around 1k on it. The converter is a different story as it was in the car when it was my DD for 4 years. Maybe has 25k on it, but I would only hit the track once or twice a month and even then was making 3 or 4 passes a time.

ill head over the the trans section of the board and start reading up there. Thanks for the reply!
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Old Oct 20, 2008 | 06:34 PM
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Originally Posted by BADD SS
Converter slippage, trans going out? Someting doesnt sound right, I mean even on a 26 inch tall tire, youre 3rd gear should top out around 123 mph or so on a stock size tire.
third gear with 3.42 and a vigilante 3600 i dont top out in third til 136+ with 275/35/18 and 6600 shift point
Dave
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Old Oct 20, 2008 | 07:45 PM
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Originally Posted by dab2pds
third gear with 3.42 and a vigilante 3600 i dont top out in third til 136+ with 275/35/18 and 6600 shift point
Dave


Yeah, with a 3.42 and 6600 shift, iwas figuring on his gears 3.73 and a 6200 rpm rev limit.....
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Old Oct 20, 2008 | 10:23 PM
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i run a 3.73 and a 26" tire and have never had problems with hitting the limiter. although i'm shifting at 6800. whats your limiter set at?
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Old Oct 20, 2008 | 11:06 PM
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Originally Posted by BadBandit69
i run a 3.73 and a 26" tire and have never had problems with hitting the limiter. although i'm shifting at 6800. whats your limiter set at?
From the HPTuners file under the WOT Shift RPM vs Shift - Performance

1->2 5200
2->3 5200
3->4 8192

When looking back at the scan of my run it shifts just about 5.8k for the 1->2 but goes all the way up to 6.8k for the 2->3

edit: ive reviewed the scan for about the 15th time while posting this and am now only counting two gears (1->2 shift) which would mean im wrapping out 2nd and not third....which makes more sense. time to look else where.

Thanks for all the help everyone
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Old Oct 22, 2008 | 01:02 PM
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Sounds like 2-3 flare up.
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Third gear is good for 124-128mph. Your converter is too loose, trans is going out, or something. You should be shifting that cam at 6500 at least.
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