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Author Topic:   Do I need a different converter?
Rustang
Gearhead

Posts: 452
From: Clarion PA
Registered: Nov 2000

posted 06-10-2001 10:10 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
I'm thinking I need a different converter, but is there anything else I should check first before spending the bucks?
Last year, with the DOT drag radials, (28" tall) these were my best times:
60' 1/8 1/8mph 1/4 1/4mph
1.60 7.068 97.56 11.14 119.9
1.52 7.08 96.6 11.175 119.9
1.61 7.09 97.87 11.109 121.9
1.68 7.12 98.23 11.123 122.5
With the exception of the 1.52 all passes were spinning. I don't know what to think about that 1.52, but I remember it jerked the wheels pretty good on that pass.
Now last Thursday night, with the Hoosier 29x10 slicks, here's what I ran:
1.63 7.02 99.53 11.000 122.34
1.65 6.99 99.76 10.96 123.33
1.61 6.97 99.83 10.933 122.78
60 foots were bad, yet I picked up in all cases down track. There was no spinning with the slicks. Any suggestions on what to look for?

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Fordwiser
Gearhead

Posts: 213
From: Metamora, Illinois
Registered: Dec 2000

posted 06-10-2001 11:09 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
My cleveland is running almost identical to yours. [email protected] with consitant 1.60 60 fts. I'm going to switch from 4.57 gears to 4.86 to see if that helps the 60 fts. I think that could be your problem too, especially since you went to 1 inch taller tire. A gear change would be alot cheaper then a new converer, at least something to think about! Roger

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kid vishus
Gearhead

Posts: 4357
From: middle of NC
Registered: Oct 2000

posted 06-11-2001 09:39 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
For that ET the 60' are not that bad, especially if you are footbraking it. The taller tire did kill a little gear ratio, but it made up for it with traction. I would change the easiest things first. And a gear swap is alot easier and cheaper than a convertor swap. Or you could try some other little "free" things first; put some more timing in it, or loosen the lash up, both of those things will give the motor some more "bottom end" torque.

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Big Block Capri
Gearhead

Posts: 126
From: Essex, Ontario, Canada
Registered: Nov 2000

posted 06-11-2001 12:18 PM     Click Here to See the Profile for Big Block Capri   Click Here to Email Big Block Capri     Edit/Delete Message   Reply w/Quote
Hey Rustang,
I posted a similar question a while back. Check out, Okay now splain me this. It was originally posted 11-30-2000. You may find some help there

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Paul Garant
"No replacement for displacement."

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70coupe
Gearhead

Posts: 346
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 06-11-2001 01:15 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
I'm running a cleveland 4v closed chamber heads with .554/.577 238/248 duration @.050 my gears are 4:11's and my 60's are completely awful. My motor isnt running near the power you guys have but could you give me a couple of tips for the cleveland? If you need any specs or anything I'll post them if your willing to help out. My times with a 70 coupe (3270lbs without driver) runs [email protected] 60's are 1.99-2.01. My buddy runs a camaro and his times are coming close to mine 13.37 and I want to stay quicker. My intake manifold is a Weiand X-cellerator single plane with a 750 double pumper mech secondaries.

[This message has been edited by 70coupe (edited 06-11-2001).]

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MrXerox
Gearhead

Posts: 322
From: Oklahoma City, Oklahoma
Registered: Nov 2000

posted 06-11-2001 01:33 PM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
Sneak a 150hp nitrous setup in there and use it just enough to stay barely ahead of him each time he makes a gain...

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steve'66
Gearhead

Posts: 6352
From: Sonoma,CA,USA
Registered: Mar 2000

posted 06-11-2001 01:43 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 70coupe:
I'm running a cleveland 4v closed chamber heads with .554/.577 238/248 duration @.050 my gears are 4:11's and my 60's are completely awful. My motor isnt running near the power you guys have but could you give me a couple of tips for the cleveland? If you need any specs or anything I'll post them if your willing to help out. My times with a 70 coupe (3270lbs without driver) runs [email protected] 60's are 1.99-2.01. My buddy runs a camaro and his times are coming close to mine 13.37 and I want to stay quicker. My intake manifold is a Weiand X-cellerator single plane with a 750 double pumper mech secondaries.

[This message has been edited by 70coupe (edited 06-11-2001).]



Your MPH is good enough for mid 12's. I'd do what I did to my daughter's '66. Get it to launch better. If you get your 60'ers down to 1.7s you'll be way ahead of your buddy. Every 2 tenths off your 60'er is worth 3 tenths off your e.t., so 1.7 60'ers should give you a 12.65 @ 105mph. Once you get the car to hook, then give it more "motor".

SteveW

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70coupe
Gearhead

Posts: 346
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 06-11-2001 03:20 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
The car hooks just fine. I'm running MT 26X10X15 slicks on the back. My 60' just completely sucks. Sway bar is disconnected,70/30 front, 50/50 rear shocks. I run the carb a little rich 75 front 77 rear with 5.5pv. Carb is list 4779 (originally 75 front 76 rear with 8.5pv).A guy at the track said try 74/75 in front and 75/74 in rear? What do you guys think?

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steve'66
Gearhead

Posts: 6352
From: Sonoma,CA,USA
Registered: Mar 2000

posted 06-11-2001 03:52 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
70coupe,

What torque convertor, and what are your launch rpms. Does it bog, or is it just a slug?

SteveW

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kwazykat
Moderator

Posts: 6317
From: ...a wonderful place to be.... orange county... NC!!!! M&M member #92 .... a blue-oval GRRL-deluxe.....
Registered: Jun 99

posted 06-11-2001 08:46 PM     Click Here to See the Profile for kwazykat   Click Here to Email kwazykat     Edit/Delete Message   Reply w/Quote
oops

[This message has been edited by kwazykat (edited 06-11-2001).]

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70coupe
Gearhead

Posts: 346
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 06-11-2001 10:04 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
My 60's are awful 1.98-2.00. My stall is supposed to be a 3500 but I only get 2500 with the foot brake and 2800-2900 flash. The tranny guy is having a new 8 3/4" converter, he call it built for me and I get it on Wednesday. He said this converter will get me 3500 minimum.

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Rustang
Gearhead

Posts: 452
From: Clarion PA
Registered: Nov 2000

posted 06-11-2001 10:21 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
70coupe, I think the higher stall will definitely help. 4V heads are notorious "boggers" with a high rpm torque curve. Another thing to try is a 750 vacuum secondary carb. I ran one for a long time with 34 squirter and light secondary spring, and it worked well with my 12 second motor. I don't recall the jet size, but I was running the secondary metering plate that had no jets.

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