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Re: Car loses ET (alot) after a few rounds?
[Re: cl440]
#1654881
08/04/14 05:56 PM
08/04/14 05:56 PM
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Joined: Oct 2005
Posts: 254
PA
MrMopar95
Panhandler
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Panhandler
Joined: Oct 2005
Posts: 254
PA
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I had the exact same problem TWICE in my life of racing with a 727 transmission.
The problem both times was the converter...
My issue was getting them too hot after so many footbrake passes in a row. I had SHELF B&M and TCI 10inch converters neither had anti-ballooning plates what allowed it to expand when hot.
I lost everything in my slip including reaction times fading away, i litterally would take an extra bump or too in the last few rounds to cover up some lost reaction time...
Consider having converter checked or if you do not have a converter with anti ballooning plates, CALL "ATI" AND HAVE THEM BUILD YOU A BAD ASS BRAND NEW CONVERTER FOR EITHER FOOTBRAKE OR TRANSBRAKE. I suggest ATI because i and many i know use them and they have proven to be reliable and extremely consistent.
Nick Bowman
1970 Plymouth Duster -
"Footbrake" Red-or-Dead
2X Pittsburgh Raceway Park Points Champion
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Re: Car loses ET (alot) after a few rounds?
[Re: Al_Alguire]
#1654882
08/04/14 06:33 PM
08/04/14 06:33 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Take a close look at your incrementals. They should tell you where you are loosing ET. Back track from there, in otherwords confirm where it is loosing the ET.
You say it feels like it will not pull up top but do the incremental times show that? Or is the problem form the get go. If it is that you are loosing ET the entire track I would be looking close at the converter or trans itself. Maybe pump pressure is being affected as the trans heats up? Know where it is loosing the ET will help diagnose where the issue is. Takes a BIG problem to loose that much ET on the top end of the track. I suspect it will be found elsewhere.
 would like to see your time slips
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Re: Car loses ET (alot) after a few rounds?
[Re: Quicktree]
#1654883
08/04/14 06:42 PM
08/04/14 06:42 PM
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Joined: Feb 2004
Posts: 34,928
S.E. South Dakota !
bigdad
Still Posting A Lot
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Still Posting A Lot
Joined: Feb 2004
Posts: 34,928
S.E. South Dakota !
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I remember one time a guy had problems similar
rear end finally seized up, out of grease
The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6
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Re: Car loses ET (alot) after a few rounds?
[Re: bigdad]
#1654885
08/04/14 07:21 PM
08/04/14 07:21 PM
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Joined: Oct 2003
Posts: 7,143
my own world
theraif
master
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master
Joined: Oct 2003
Posts: 7,143
my own world
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Quote:
I remember one time a guy had problems similar
rear end finally seized up, out of grease
same here a race buddy had the same issue though it was a ford
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Re: Car loses ET (alot) after a few rounds?
[Re: cl440]
#1654887
08/05/14 12:10 AM
08/05/14 12:10 AM
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Joined: Mar 2006
Posts: 9,858
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,858
MI, usa
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Quote:
Quote:
How do the 1/8 mile times compare?
Don't have the slips in front of me but when it started going away it was all after the 60'. 
Mine car is about a .10 slower than yours. I saw the same thing at Milan Sunday. The loss is almost always 330ft and earlier. If I do the math after 330ft to 660ft to 1000ft to 1320ft it's dead on. Even the 60ft on 6 out of 7 passes were with-in .01. According to my gauges the correction best to worst was 1.015-1.021. My bet is it's spinning 60-330. I run gas. Tires are 10.5Wx31 M/T.
Doug
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Re: Car loses ET (alot) after a few rounds?
[Re: dvw]
#1654888
08/05/14 12:38 AM
08/05/14 12:38 AM
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Joined: Jan 2003
Posts: 11,721
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,721
Portage,michigan
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I had a similar problem a few years back. Car would run a few good laps then fall way off( 1/2 sec) starting in top of 2nd gear and to the stripe. Then it might not act up again the rest of the night, or might do it 2 or3 times. Tried ice, moving stuff around, finally after two months of guessing I got lucky and swapped out the 6al box. That fixed it. Mine fell off a lot more, but otherwise similar symptoms. With having a spare box, it's a quick possibility to rule out.  
Last edited by B3422W5; 08/05/14 12:41 AM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: Car loses ET (alot) after a few rounds?
[Re: B3422W5]
#1654889
08/05/14 08:56 AM
08/05/14 08:56 AM
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Joined: Feb 2003
Posts: 2,563
S.E. Michigan
cl440
OP
master
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OP
master
Joined: Feb 2003
Posts: 2,563
S.E. Michigan
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Quote:
I had a similar problem a few years back. Car would run a few good laps then fall way off( 1/2 sec) starting in top of 2nd gear and to the stripe. Then it might not act up again the rest of the night, or might do it 2 or3 times. Tried ice, moving stuff around, finally after two months of guessing I got lucky and swapped out the 6al box. That fixed it. Mine fell off a lot more, but otherwise similar symptoms. With having a spare box, it's a quick possibility to rule out.
Sounds exactly like our problem Don. We are still going to try a different carb and hopefully test Wednesday. We will have our spare 6AL with us and swap if the problem arises. If neither fix the problem then maybe we need to consider a converter change.
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Re: Car loses ET (alot) after a few rounds?
[Re: cl440]
#1654890
08/05/14 04:59 PM
08/05/14 04:59 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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I had a rear rubber brake line swell shut. It would be fine for awhile then start slowing the car down drastically
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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