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Old 08-21-2010, 08:30 AM   #16
$upernova
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Default Re: Trans-brake pressure relief orfice ?????

Have to remember this is a 275/60/15 DR. Not forgiving.

Last edited by $upernova; 08-21-2010 at 08:33 AM.
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Old 08-21-2010, 09:30 AM   #17
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Lightbulb Re: Trans-brake pressure relief orfice ?????

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Originally Posted by $upernova View Post
It's a leaf spring car.

I think that too fast of a brake at a high rpm causes higher fluid pressure and will hit so hard that it will slap the tires into a hard spin.
Then why do many leaf spring cars on drag radials nearly stand on the rear bumper when they launch? The suspension, the set up of the suspension, the trans hitting the tires


You think the trans is the problem from your years of trans experience ?

Re-read what Grinertech posted on suspension. That is where one of your problems is, not the trans hitting the tires
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Old 08-21-2010, 02:11 PM   #18
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Default Re: Trans-brake pressure relief orfice ?????

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Hey John,

I've had 25* out for up to .5 in the 7531 box. I've had the progressive starting as low as 20% and dual ramped it in at a 1.25 seconds. Very soft tune up stuff. I can launch on the brake at 2500 rpm's wih these setting and that's about it any higher on the rpm and it just slaps the tires.
I looked at all the data and found that no matter if it's on or off nitrous, it will only handle a mid 1.4 60'. Try to tune it up and spin the tires
this isnt John. Im Anthony, I used a pic of Johns car since I thought it was a cool pic, well that and the fact that my car never seems like it will be done. You could do a serch on Johns board and there some pics of my car.
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Old 08-21-2010, 02:18 PM   #19
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Default Re: Trans-brake pressure relief orfice ?????

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Then why do many leaf spring cars on drag radials nearly stand on the rear bumper when they launch? The suspension, the set up of the suspension, the trans hitting the tires


You think the trans is the problem from your years of trans experience ?

Re-read what Grinertech posted on suspension. That is where one of your problems is, not the trans hitting the tires
The problem is more than one thing, its a leaf spring car problem #1 but that can be worked out. #2 its got too much gear for a leaf spring car on a tire that measures something like 27 1/2 or 27 3/4 tall and about 9 wide. mind you its a nitrous car. It has happened many times before put less gear in it and the car is quicker and faster. BTW we did it from a 4.56 to a 3.90 and the car was much easier to get off the line, gained 60 ft , et and mph.
also sometimes the taller gear will cause the car to stand on the bumper, most think its the other way but its not. same as taking power with the progressive or 7531, somtimes pulling power to a lever makes the car climp the ring gear.
I would suggest a better set of shocks in the rear.
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Old 08-21-2010, 04:43 PM   #20
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Default Re: Trans-brake pressure relief orfice ?????

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The problem is more than one thing, its a leaf spring car problem #1 but that can be worked out. #2 its got too much gear for a leaf spring car on a tire that measures something like 27 1/2 or 27 3/4 tall and about 9 wide. mind you its a nitrous car. It has happened many times before put less gear in it and the car is quicker and faster. BTW we did it from a 4.56 to a 3.90 and the car was much easier to get off the line, gained 60 ft , et and mph.
also sometimes the taller gear will cause the car to stand on the bumper, most think its the other way but its not. same as taking power with the progressive or 7531, somtimes pulling power to a lever makes the car climp the ring gear.
I would suggest a better set of shocks in the rear.
Hi Anthony,
It seems to be solid advice. I'm already looking for shocks and the gear is coming.

Thanks

And to some of you smart a$$e$ Kiss my
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Old 08-21-2010, 09:26 PM   #21
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Default Re: Trans-brake pressure relief orfice ?????

I have made leaf spring drag radial cars work just fine with a 2.48 first gear TH400 without a progressive. You have more tols to work with that I ever had so im certain you will get it sorted out. Don't think of caling me a smart ass , I hope im not coming across as one. I speak from hands on experience , im not just a trans guy I have spent some time in the trenches too!!
I still think your car will work with what you have , Im just trying to save you a few bucks on a bunch of shit you don't need.



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Old 08-21-2010, 09:57 PM   #22
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Default Re: Trans-brake pressure relief orfice ?????

I'm not calling you one Hutch, I respect your knowledge and info. You did answer my question so i'm looking at other things like shocks in the rear. I have QA-1 R's in the front and Rancho RS 9000's in the rear. I going to put a good double ajust on it.

Here a video of the car leaving... UGLY!!!!

http://www.youtube.com/watch?v=m-gGt-82XcE
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Old 08-21-2010, 10:33 PM   #23
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Default Re: Trans-brake pressure relief orfice ?????

Was that track prepped with Mazola?


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Old 08-21-2010, 10:36 PM   #24
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Default Re: Trans-brake pressure relief orfice ?????

It sucked all night. But I did get a the video to see the launch....
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Old 08-21-2010, 11:36 PM   #25
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Default Re: Trans-brake pressure relief orfice ?????

No car with any kind of power will work on a poorly prepped surface like that. The car would not even get a hold of the track in high gear!! You would have been better off testing on an old back road.


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Old 08-21-2010, 11:39 PM   #26
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Default Re: Trans-brake pressure relief orfice ?????

Amazingly it initially hooked , so the transbrake hit is fine.


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Old 08-22-2010, 06:54 AM   #27
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Default Re: Trans-brake pressure relief orfice ?????

Quote:
Originally Posted by Hutch View Post
No car with any kind of power will work on a poorly prepped surface like that. The car would not even get a hold of the track in high gear!! You would have been better off testing on an old back road.


Hutch
it does that on a good track. I had all the power out of it.
23* out on the timing held out for .5
and the progressive at 20% out for .8

We're not going back out until it cools off some. It's been no less than 103* every day for a month now.
I want to changh the rear shocks. I think it's unloading because the shock can't hold. what do you think? It has to do better than that. A buddy of mine went a 5.62 right after I made the run.
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Old 08-22-2010, 07:02 AM   #28
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Default Re: Trans-brake pressure relief orfice ?????

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Amazingly it initially hooked , so the transbrake hit is fine.


Hutch
At 2500 rpm's. If i set the rpm any higher it hits so hard it goes in to instant tire spin.
Thats why I aksed the question in the first place. Got get it worked out and have to look at everything.

How much will gear calm it down?

I wished I had a video of it hitting so hard. Let me look.
I have a video I will load it tonight . It's amazing...

I would be greatful for any help...
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Old 08-22-2010, 02:12 PM   #29
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Default Re: Trans-brake pressure relief orfice ?????

It will hit harder at higher RPM's but thats not the trans doing it. Thats because with more RPM's you are generating more stored energy to send to the tire. Converters play a big role , maybe you need a looser converter to take away some hit. I don't know your combination at all so I can't say for sure.


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Old 08-22-2010, 02:29 PM   #30
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Default Re: Trans-brake pressure relief orfice ?????

I'm at work until later this evening. I'll post my whole combo and the video of the tires spinning at the hit when I get home.
With more info maybe we get to a better understanding of what's going on.
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