needing help with launch
#1082116
09/25/11 01:26 PM
09/25/11 01:26 PM
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Joined: Jan 2005
Posts: 716
Indiana
65dragnet
OP
super stock
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OP
super stock
Joined: Jan 2005
Posts: 716
Indiana
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Well another wasted weekend trying to get my car to launch. Was a total embarrassment at Monster Mopar. My car is totally lazy off the starting line. I'm at my wits end with it. I've rep laced Msd ign box ,coil, carb torque convertor,went through tranny, two step box, even tried foot braking it and it still won't launch.I know I have probably not gave enough info with my combo for some people to help but this car has had 1.38 60 fts. and now i have 1.58 at best will not spin the tires other than the burnout. Sat. it ran the best at 1.57 60ft 10.34 @ 129.80. I let off the transbrake button and the car drives out like a throttle stop car and then it kicks butt and runs flawlessly through the 1/4 mile no misses pops or anything. I'm beat! ANY HELP APPRECIATED  
E. Williams 65 Coronet 500 3400lbs w/d, 446, Indy EZ'S, A&A transbrake,Comp 650 lift cam, 6.50 @ 105 mph 1/8th 10.25 @ 130mph 1/4
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Re: needing help with launch
[Re: 65dragnet]
#1082117
09/25/11 02:12 PM
09/25/11 02:12 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Well another wasted weekend trying to get my car to launch. Was a total embarrassment at Monster Mopar. My car is totally lazy off the starting line. I'm at my wits end with it. I've rep laced Msd ign box ,coil, carb torque convertor,went through tranny, two step box, even tried foot braking it and it still won't launch.I know I have probably not gave enough info with my combo for some people to help but this car has had 1.38 60 fts. and now i have 1.58 at best will not spin the tires other than the burnout. Sat. it ran the best at 1.57 60ft 10.34 @ 129.80. I let off the transbrake button and the car drives out like a throttle stop car and then it kicks butt and runs flawlessly through the 1/4 mile no misses pops or anything. I'm beat! ANY HELP APPRECIATED
When did it start the slow launch... did you change
something in the engine... what is the stall on the
converter(when you stall it on the trans brake without
a rev chip)... I had a similar issue when I first
built my car... the stall was WAY TO LOW plus the
valve springs were JUNK so it made no power
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Re: needing help with launch
[Re: 65dragnet]
#1082118
09/25/11 02:47 PM
09/25/11 02:47 PM
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Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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Sounds like convertor to me...I spent several $$$ and weeks a few years ago with a problem pretty much like you described. A new convertor fixed the problem.  My car felt like it had a vacuum secondary carb,or, a real slow advancing distributor...which it had neither. Felt like I was chained to the tower till about the 60' marker, then would go fine.
If you like drag racing, support your local track.
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Re: needing help with launch
[Re: MR_P_BODY]
#1082121
09/25/11 05:15 PM
09/25/11 05:15 PM
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Joined: Jan 2005
Posts: 716
Indiana
65dragnet
OP
super stock
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OP
super stock
Joined: Jan 2005
Posts: 716
Indiana
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Mr P; this all came about when I took my 499 out and replaced it with my known good backup engine,(446c.i.)When freshening this engine I decided to install cam straight up. Big mistake , I did remove two step chip and stalled it against the brake , it wouldn't do 3100 rpms. So I assumed I smoked a convertor. Had the convertor cut open and there was nothing wrong with it. Looked like a new one and by the way this convertor usually stalls 5700 on the brake. Going from there I decided the cam needed to be advanced so I put it back at 4* advanced, where it was originally was.This didn't help either and it still wouldn't stall so I borrowed a convertor and went through tranny just to be sure.Now this convertor will stall 5500 on tranny brake and said now we're getting somewhere. Wrong again! By the way new valve springs too thanks for your input
E. Williams 65 Coronet 500 3400lbs w/d, 446, Indy EZ'S, A&A transbrake,Comp 650 lift cam, 6.50 @ 105 mph 1/8th 10.25 @ 130mph 1/4
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Re: needing help with launch
[Re: 65dragnet]
#1082124
09/25/11 07:23 PM
09/25/11 07:23 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Mr P; this all came about when I took my 499 out and replaced it with my known good backup engine,(446c.i.)When freshening this engine I decided to install cam straight up. Big mistake , I did remove two step chip and stalled it against the brake , it wouldn't do 3100 rpms. So I assumed I smoked a convertor. Had the convertor cut open and there was nothing wrong with it. Looked like a new one and by the way this convertor usually stalls 5700 on the brake. Going from there I decided the cam needed to be advanced so I put it back at 4* advanced, where it was originally was.This didn't help either and it still wouldn't stall so I borrowed a convertor and went through tranny just to be sure.Now this convertor will stall 5500 on tranny brake and said now we're getting somewhere. Wrong again! By the way new valve springs too thanks for your input
Have you done a compression check... it sounds like
a engine issue not making any torque
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Re: needing help with launch
[Re: 65dragnet]
#1082128
09/25/11 10:23 PM
09/25/11 10:23 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
No but I will ! I don't think that's an issue but I can't leave a stone unturned. Thanks Mike ! Engine has fresh stress hone new rings and bearings on freshen up, has 20 passes on it now.
Whats the LSA and what do you have it in at.... and
ARE YOU SURE its at that installed degree... its acting
like its down (alot) on torque... you could have broke
some rings on the install (just a guess) but the
compression test should tell you something..... JMO
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Re: needing help with launch
[Re: 65dragnet]
#1082131
10/06/11 01:19 AM
10/06/11 01:19 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Many days have past since my original post and I have finally stumbled onto the problem. I don't have an explaination as to why but , I changed out the transbrake for another , and bingo the launch is back and actually faster. Thanks for the guys who posted and tried to help, I was ready to throw in the towel ! We tested tonight and the car had a best of 10.27 @ 130.71 
Thats strange... wonder if it was totally releasing...
did you open up the valve body yet to see whats happening
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