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Converter help
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William Jones
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Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Tue Jul 13, 2010 9:53 pm    Post subject: Converter help Reply with quote

Figured out that the converter seems tobe to loose in high gear I am turning 7000K at 114 in the 1/8 with a 4.30 gear and a 28 X 10 1/2. But the wierd thing is I am only turning 7800 at 142 in the 1/4. Something isn't right I have been chasing incosistency issues I will the same 60ft but the car will be all over the place last time out I ran 6.18 then the next pass would have ran 6.09 but dumped it at the end. I think the problem is in the converter or trans what do you guys think. I have a free reflash with this converter should I tighten it or what? Here is a link to some video so you can here the motor going down track. What do you guys think

Bam

http://sbftech.com/index.php/topic,26679.msg275301.html#new

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92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Wed Jul 14, 2010 4:57 pm    Post subject: Reply with quote

what kind of tire radial or bias ply?
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af2
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Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Wed Jul 14, 2010 6:47 pm    Post subject: Reply with quote

I think you are going through the converter in the 1/8th and then settling down from there.

Trans temp could be what's going on?
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William Jones
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Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Wed Jul 14, 2010 9:57 pm    Post subject: Reply with quote

Its a M/T bias ply slick.

I was thinking the same thing the converter company said that since my motor starts to drop Hp after 6800 that the converter starts to tighten back up down track so maybe thats why its not so far off in the 1/4. Which I think is wierd since it was built with a small shot of Nitrous in mind so it should have been a little tight. Maybe he didn't believe me when I said it makes around 700fwhp. So now the deliema do I get it restalled and change the rear gear to cross at 7100 or what? I will try to get a trans temp reading next time out after a pass but the oil isn't burnt yet I keep an eye on that. Trying to get everything I can out of this thing I am leaning toward a 3.90 gear and restalling the converter. I just hope it don't kill my 1/8 mile ET's to bad. I wish I was running a 3 speed in this situation.

Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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af2
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Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Wed Jul 14, 2010 10:49 pm    Post subject: Reply with quote

William Jones wrote:
Its a M/T bias ply slick.

I will try to get a trans temp reading next time out after a pass but the oil isn't burnt yet I keep an eye on that.

Bam


Not what I was saying!
I was going to not warm enough and pulling through and that is all.
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William Jones
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Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Thu Jul 15, 2010 1:18 am    Post subject: Reply with quote

It happens when the tranny is still hot we run within a hour time frame lastime it was only like 45min. between runs. So you don't think the converter is to loose?


Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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af2
Member


Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Fri Jul 16, 2010 12:32 am    Post subject: Reply with quote

William Jones wrote:
It happens when the tranny is still hot we run within a hour time frame lastime it was only like 45min. between runs. So you don't think the converter is to loose?


Bam


I feel you have a problem with the converter. What does "tightening" have to do with it? So you have a 5000 now that pulls to 5400 at the 1/4? It doesn't make sense.
Just an illustration.

Why a shop would say to tighten it is pretty absurd. You are blowing through it without the NOS ,what is going to happen when you juice it?


7000 at 114 and 7800 at 142 is pretty simple for the converter guy to figure out I would think. Wink
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Fri Jul 16, 2010 12:47 am    Post subject: Reply with quote

I haven't listened to your video's yet, but from your 1/8th and 1/4 mph numbers I have heard Powerglide cars sound like they were doing the same thing. Not really much drop on the shift and they sounded like they weren't going anywhere since rpm's weren't really climbing. I haven't heard it too much with a 3 speed setup which is weird because high is of course the same ratio in each. What type of fluid are you running? I have read about switching to a John Deere hydraulic fluid being worth a couple hundred rpm's different in stall speed. However I'm sorta like af2, the inconsistency bothers me. Too loose or too tight, it should repeat. Clay
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Fri Jul 16, 2010 1:44 am    Post subject: Reply with quote

are you spraying or are those passes motor only ?
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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af2
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Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Fri Jul 16, 2010 2:18 am    Post subject: Reply with quote

10sec.et wrote:
are you spraying or are those passes motor only ?



NA.
At 7000 you should be in the 130 range.
At 7800 about 145ish.
That is the reason the converter is messing with you.
You lost about 800 rpm in the 1/8th.

I haven't said it for a reason! Fix the problem(converter) before you start changing everything else PLEASE!!!!!!

Nothing worse than going backwards!! I KNOW! Laughing
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William Jones
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Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Fri Jul 16, 2010 8:49 pm    Post subject: Reply with quote

Yeah I agree the converter is coming out on Monday. I wanted to try Q-16 out so I took it to a friends dyno to see what it would pickup. We gained a solid 10hp to the wheels just changing fuel and jetting it up for the Q 16 no other changes. But the converter started to show its ugly face on the dyno we made peak torque at 6600rpm and peak Hp at 6850 and the torque was way low then started to come on when it should have been going down. It made a peak of 543whp and 421 ftlbs I kinda of figured the numbers were going to be low cause we have so much slippage. About 4 pulls in with 20 min in between the numbers started dropping then coming back on subsequent runs. I called FTI to tell him it was on its way back after I run this weekend and that I have all the info and videos he will need to get this thing right he said he will get on it as soon as it gets there and fix her up for me.

Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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William Jones
Member


Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Fri Jul 16, 2010 8:49 pm    Post subject: Reply with quote

10sec.et wrote:
are you spraying or are those passes motor only ?


N/A

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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William Jones
Member


Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Tue Jul 20, 2010 2:33 am    Post subject: Reply with quote

Here is link from this weekend watch the tach. This converter is through like AF2 said. It came out of the car today and is going back. When I shifted at 7200 it only dropped to 6800. With out the chip in it on the brake it goes 6500rpm this thing is way wrong for my car.

Bam

http://www.youtube.com/watch?v=K7dApbwynos&feature=channel

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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af2
Member


Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Tue Jul 20, 2010 6:36 pm    Post subject: Reply with quote

Where is the Tach? Confused It is dark.
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William Jones
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Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Tue Jul 20, 2010 8:26 pm    Post subject: Reply with quote

Its in the center of the dash and its kinda hard to see watch in full screen to see it better. I left at 5000 rpm on the Tbrake.

Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
Back to top
View user's profile Send private message
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