Transmission Gurus...a question

Everything from the motor to the wheels

Moderator: John_Heard

Post Reply
Message
Author
User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Transmission Gurus...a question

#1 Post by BracketNova » Sat Oct 01, 2011 7:46 pm

Had some trans brake related issues this weekend...

The car seems to be having issues with the trans brake holding. I went out Friday night first two passes went great trans was 120° first pass, came right around again trans was 165° on the second pass, around again trans was 190° and acted like the trans brake wasn't even on.

Same deal Saturday but without hot lapping. First two runs were great third run the trans was at 180° and acted like the brake wasn't engaged. I inspected the wiring and thought it might have been a bad connection, re did the connectors. Went out again, the car moved forward a bit (which it usually never does) when I brought it up against the converter, but held. Trans temp I believe was around 170°. The next two passes the brake held but the 60s got ~.01 worse each pass. The car had rests between rounds and the temp was again around 170° or so.

Someone had said my lower band may need adjusted :smt102 I've never done this.

I did remove the alternator for this weekend, could that have something to do with it? I use an optima red top. Charged it before I went everytime on saturday. :scratch:

The trans is the only thing I outsource on the car, everything else I do. I like to learn but not when it costs me $400 or $1000 - I was heading into the finals. banghead:

On a positive note...new personal best 7.06 @ 95.97 :mrgreen:
Last edited by BracketNova on Sun Oct 02, 2011 11:07 pm, edited 1 time in total.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

User avatar
wikd69
Posts: 2068
Joined: Sat Feb 23, 2008 12:42 pm
Location: Rocklin, CA
Contact:

Re: Transmission Gurus...a question

#2 Post by wikd69 » Sat Oct 01, 2011 11:05 pm

Whose valve body are you using ?

I have a TCI on my TH400 and it seems that it will sometimes hang the brake from locking for just a split second, just enough to push me through the beams...

I've learned to get on the break a lot earlier, way before I nailed the throttle...
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: Transmission Gurus...a question

#3 Post by BracketNova » Sat Oct 01, 2011 11:58 pm

I don't recall who made it. It's not had a 'delay' problem if you will in the past :scratch: I generally hit the button when I stage and hit the throttle after I release the button (delay box).

I may need to rig up a pressure gauge, just wanted to see if it's something I need to adjust before I go to the trouble.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: Transmission Gurus...a question

#4 Post by BracketNova » Mon Oct 03, 2011 8:25 pm

Thinking it was taking the alternator off. I only have one battery, so I'd imagine other components were competing for juice.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

User avatar
Bruce69Camaro
Posts: 1781
Joined: Thu Jul 23, 2009 11:07 am
Location: PA

Re: Transmission Gurus...a question

#5 Post by Bruce69Camaro » Tue Oct 04, 2011 11:20 am

Sounds very similar to a problem my co-worker had with his Mustang.

All he did was change from a manual valve body to a trans brake in his C4 and that's when all the problems started.

He had a TCI trans brake and he sent it back two times to be checked out and each time they said nothing was wrong.

He then sent the trans back to the tranny shop and they said it was indeed the T/B.

He got tired of messing around so he replaced it with a Trans Specialties T/B and the problem went away.

I'm not saying that's the problem, but your story sounds very similar.
Those who think they know it all have no way of finding out they don't......... :scratch:

User avatar
Hnrywho
Posts: 18
Joined: Wed Aug 18, 2010 8:30 pm

Re: Transmission Gurus...a question

#6 Post by Hnrywho » Tue Oct 04, 2011 11:25 am

Congrats on the new personal best! Looks like the improvements you made helped. :thumb:

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: Transmission Gurus...a question

#7 Post by BracketNova » Tue Oct 04, 2011 7:46 pm

Thanks Hnrywho


I'm going to put the alternator back on and see how it goes. If I hadn't made any changes and theses problems surfaced I would start looking at the tranny. But I think my best bet is to put it back to the way I had it :roll:

My friend that built it used Trans Specialties parts so I'd imagine thats the valve body that's in there.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

luv454
Posts: 45
Joined: Fri Apr 24, 2009 4:28 pm

Re: Transmission Gurus...a question

#8 Post by luv454 » Wed Oct 05, 2011 8:26 am

In the past I had a transbrake solenoid go bad. It would work fine first couple passes then nothing. When the solenoid gets real hot it quits. Reach under the car and touch the solenoid after a pass. Carefully! Or check the wire going to it make sure it did not burn into.

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: Transmission Gurus...a question

#9 Post by BracketNova » Wed Oct 05, 2011 7:25 pm

That makes sense. I'll check it out.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: Transmission Gurus...a question

#10 Post by BracketNova » Fri Oct 07, 2011 10:16 pm

Well gents it looks like it indeed was a voltage problem. Didn't miss a lick tonight.

Also on a positive note.... Ran a 7.1772 in the right lane, next time up ran a 7.1771 in the left. :bling: The air was 40' better the second pass.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

User avatar
wikd69
Posts: 2068
Joined: Sat Feb 23, 2008 12:42 pm
Location: Rocklin, CA
Contact:

Re: Transmission Gurus...a question

#11 Post by wikd69 » Sat Oct 08, 2011 1:44 am

BracketNova wrote:Well gents it looks like it indeed was a voltage problem. Didn't miss a lick tonight.

Also on a positive note.... Ran a 7.1772 in the right lane, next time up ran a 7.1771 in the left. :bling: The air was 40' better the second pass.
Cool beans !!!! Nice runs :thumb:
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest