Re: 60 ft frustration is driving me nuts
[Re: Al_Alguire]
#2786615
06/17/20 10:08 PM
06/17/20 10:08 PM
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Joined: Apr 2005
Posts: 2,128 Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Well I would be looking hard to the converter. Reaction times obvious would change with tire slippage, but if it is dead hooking and running slow on the tree and 60' I would be looking for a converter to toss in it for sure. Might look at the trans as well but sure sounds like a converter issue to me. Just went through this on a biddies S/ST car. Pulled converter and found some fins had been knocked loose from brazing, same deal. Reaction times and 60's inconsistent down track was fine. This! Converter sounds hurt to me too.
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Re: 60 ft frustration is driving me nuts
[Re: dvw]
#2786902
06/18/20 05:34 PM
06/18/20 05:34 PM
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Joined: May 2006
Posts: 740 WA
JD Dart
super stock
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super stock
Joined: May 2006
Posts: 740
WA
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I'm not a fan of mechanical diode had one go bad you could see on racepak, when it went bad, 60' was all over the place. Sent the converter back they said it's OK. Ask them to change the stall by 300 hundred looser Long story short I didn't put that converter back in for a few years then went to a bracket final in Boise and thought I'll give it a try should work great for higher altitude. It did on the 1st pass then broke on the second pass would want to push me while staging but it was done lost 7-9 mph and ET went to crap. Sent it back again this time they changed the diode and I sold that convertor and will never use them again. I will only run spragless nothing to go wrong but the normal laying over fins. You don't have racepak or any data recorder on your car?
best so far 8.53 @ 158.59 MPH 60'1.240
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Re: 60 ft frustration is driving me nuts
[Re: tabletop390]
#2787009
06/19/20 07:32 AM
06/19/20 07:32 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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We just ran into something similar on a buddy’s car and the fix believe it or not was a new master switch. The initial hit and vibration off the line and during the burnout was causing the disconnects and reconnects and making his MSD go nuts. Once he got out around 30-40 ft car settled and didn’t vibrate as much and ran like a champ. We did everything, converters, carbs, rebuilt the trans, etc. Don’t discount this. It has happened to me also. My car was EFI. The logger was the EFI. When this happened, it would get a corrupt the log, so finding the issue was difficult. The engine wouldn’t die, nothing went 100% dead, but everything electrical would glitch. Would not believe it if it hadn’t happened to me.
"use it 'till it breaks, replace as needed"
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Re: 60 ft frustration is driving me nuts
[Re: dvw]
#2787026
06/19/20 09:19 AM
06/19/20 09:19 AM
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Joined: Aug 2003
Posts: 4,689 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,689
On the parachute mount
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Tires were swapped at the end of the years when I started noticing the problem. Since this issue has occurred the video shows zero tire slip. Also has done it now with 2 different brand converters. it will be getting a data logger. Doug I know that some NSS rules say no data loggers, But honestly I would hide it in the car if I had to. At the minimum get yourself a Racepak Sportsman. Best thing you will ever do, and your fast car will become even faster ! ! I couldn't race without one now LOL
....BAD A$$ STREET CAR.....
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Re: 60 ft frustration is driving me nuts
[Re: TRENDZ]
#2787041
06/19/20 10:07 AM
06/19/20 10:07 AM
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Joined: Jan 2003
Posts: 8,030 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,030
Tulsa OK
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We just ran into something similar on a buddy’s car and the fix believe it or not was a new master switch. The initial hit and vibration off the line and during the burnout was causing the disconnects and reconnects and making his MSD go nuts. Once he got out around 30-40 ft car settled and didn’t vibrate as much and ran like a champ. We did everything, converters, carbs, rebuilt the trans, etc. Don’t discount this. It has happened to me also. My car was EFI. The logger was the EFI. When this happened, it would get a corrupt the log, so finding the issue was difficult. The engine wouldn’t die, nothing went 100% dead, but everything electrical would glitch. Would not believe it if it hadn’t happened to me. I had a friend with a backfire problem on a nitrous mustang. It would backfire at the hit no matter what we did. The problem ended up being a bad connection at the master switch. We found the problem real quick at the first night race because the taillights flashed, then it backfired and moved out. We fixed the connection and he promptly dang near drug the bumper off of it on the next pass when everything worked as it should.
68 Barracuda Formula S 340
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Re: 60 ft frustration is driving me nuts
[Re: dvw]
#2787108
06/19/20 01:11 PM
06/19/20 01:11 PM
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Joined: Jan 2003
Posts: 19,378 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,378
Las Vegas
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Jess echoes my sentiments on mechanical diode converters. Been there done that. As for converter guys saying they found nothing been there done that more than once as well. not saying that's happening but seen it happen more than once. Just had a buddy wipe out the thrust in his S/ST car due to a converter(big name shop), but they told him all was well. Oddle enough came back with a billet fro Kinda like finding a problem with and MSD unit that wont start a car yet they find nothing and works like a champ when it comes back Plenty of validity to the cut off switch deal, seen that happen a number of times. Especially on older switches or hard leaving cars. Charging system voltage issue in general on the same style car. We had an alternator issue on the dragster that was causing the car to shut off when the shifter was activated. Car was still deadly consistent but we could not figure it out. Til it was on a single and we heard it shut off. The alternator was working just not enough to cover up the draw of the solenoid. If we had a date logger would have been much easier to diagnose. New battery and alternator and it was good to go. Like I say be interested to see what you ultimately find.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 60 ft frustration is driving me nuts
[Re: A727Tflite]
#2787158
06/19/20 03:27 PM
06/19/20 03:27 PM
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Joined: Jan 2003
Posts: 11,723 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,723
Portage,michigan
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First thing I would swap would be the MSD box. One of our cars back in the day lost a tenth over time, car was running low tens. Forgot what led us to it but replacing the box brought it to life.
Two converters - same result, eliminates that I think.
Had a bad digital 6 box years ago that slowed my car down 1/2 second, but not on every pass. Maybe once every three or four passes. Set up to run 10 flat, would run 10.50ish when it occurred. Chased everything most of a season before swapping the box out and finally fixing it. Good thought, could well be the box.. capable of wierd issues
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, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: 60 ft frustration is driving me nuts
[Re: dvw]
#2787200
06/19/20 06:22 PM
06/19/20 06:22 PM
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Joined: Jan 2003
Posts: 5,991 Anoka County, MN
Leigh
master
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master
Joined: Jan 2003
Posts: 5,991
Anoka County, MN
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Having chased the same dog, and frankly, still waiting to see if I know the reason, and actually holding a diode in hand, they either work or destroy themselves. Mine wore over 15 years, but still worked. I’m trying to get back together, to verify a fuel delivery suction issue. Good luck!
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