Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

Carb swap

Thread Tools
 
Search this Thread
 
Old 02-04-2018, 08:37 AM
  #1  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Carb swap

okay so my car is almost done but the mechanic didn't use the return regulator like i wanted him to and he has the tv cable in the wrong position i have a street demon carb and he did not use the center stud hole he used the one for the ford trans.

What would happen with the trans in that spot he said he had to put it there because its not long enough , and the regulator he has the supply line going to the return port and out to the carb i know this will make my pump not live as long.
Old 02-04-2018, 08:40 AM
  #2  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

Oh and he cant get it to shift correctly, hopefully he will sort the trans part out before he gives it back but i will still might have to mess with that return regulator
Old 02-04-2018, 10:16 AM
  #3  
Supreme Member

iTrader: (3)
 
TylerSteez's Avatar
 
Join Date: May 2013
Location: CT
Posts: 1,393
Received 54 Likes on 38 Posts
Car: 86 Trans Am WS6
Engine: 383 stroker
Transmission: Dynamic Racing Reverse Manual 700r4
Axle/Gears: 9 Bolt 3.45
Re: Carb swap

A misadjusted TV cable will kill a trans fast. What are you switching from? TBI or TPI?
Old 02-04-2018, 01:53 PM
  #4  
Sponsor

iTrader: (92)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 15,393
Received 644 Likes on 569 Posts
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Carb swap

He’s going from tpi to carb.
https://www.thirdgen.org/forums/tran...wn-detent.html
I think this is the cable you need


Last edited by Tuned Performance; 02-04-2018 at 01:59 PM.
Old 02-04-2018, 06:02 PM
  #5  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

Originally Posted by TylerSteez
A misadjusted TV cable will kill a trans fast. What are you switching from? TBI or TPI?
Tpi we got a new shift cable and fixed that but now we need a new kick down cable they say it isn't shifting out of low gear and they have it rigged up with zip tes in a chain fashion hooked up to the stud hole for a ford transmission
Old 02-04-2018, 06:03 PM
  #6  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

Originally Posted by Tuned Performance
He’s going from tpi to carb.
https://www.thirdgen.org/forums/tran...wn-detent.html
I think this is the cable you need

Yeah that is what I need how much would it cost to install it would you think
Old 02-04-2018, 07:21 PM
  #7  
Supreme Member
iTrader: (1)
 
NoEmissions84TA's Avatar
 
Join Date: Feb 2017
Location: Meriden, CT 06450
Posts: 4,030
Received 511 Likes on 428 Posts
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Carb swap

street demon carb

You need a throttle valve correction bracket. https://www.summitracing.com/parts/sum-700202
Old 02-04-2018, 07:47 PM
  #8  
Sponsor

iTrader: (92)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 15,393
Received 644 Likes on 569 Posts
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Carb swap

Originally Posted by SketchyZed
Yeah that is what I need how much would it cost to install it would you think
I’m not sure, it’s only retained with one bolt in the transmission.
Old 02-04-2018, 08:07 PM
  #9  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

Originally Posted by Tuned Performance
I’m not sure, it’s only retained with one bolt in the transmission.
how long of a tv cable you think I need to get
Old 02-04-2018, 08:12 PM
  #10  
Supreme Member

 
skinny z's Avatar
 
Join Date: Dec 2005
Location: Alberta
Posts: 9,123
Received 625 Likes on 526 Posts
Re: Carb swap

Originally Posted by SketchyZed
Yeah that is what I need how much would it cost to install it would you think
If they're an honest bunch, it shouldn't amount to an hours labour. One bolt, the pan stays on.
But.....

Originally Posted by NoEmissions84TA
street demon carb

You need a throttle valve correction bracket. https://www.summitracing.com/parts/sum-700202
You've got to have this bracket or you will cook your transmission. Without the corrector, the amount the cable is pulled relative to the amount the throttle is out of whack an insufficient line pressure rise is the result.
Old 02-04-2018, 09:23 PM
  #11  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

The holley street demon already came with a stud hole for the 200r4 and 700r4 trans http://documents.holley.com/lit701rev10.pdf
Old 02-04-2018, 09:33 PM
  #12  
Supreme Member

 
skinny z's Avatar
 
Join Date: Dec 2005
Location: Alberta
Posts: 9,123
Received 625 Likes on 526 Posts
Re: Carb swap

Fair enough.
I have a Barry Grant Street Demon and there is no such provision. (Holley acquired BG and the Demon brand).
Old 02-04-2018, 09:47 PM
  #13  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

tomorrow morning we are getting it on a trailer and bring it down to a trans shop to get this taken care of.

He said we had two options get a new tv cable or a tv cable extension but i don't know which one i would need.

Last edited by SketchyZed; 02-04-2018 at 09:51 PM.
Old 02-04-2018, 09:57 PM
  #14  
Supreme Member

 
skinny z's Avatar
 
Join Date: Dec 2005
Location: Alberta
Posts: 9,123
Received 625 Likes on 526 Posts
Re: Carb swap

Seeing as this is a swap, any number of things can get in the way of getting the proper geometry. Your mechanic may not be aware that there's more to just putting the cable in the proper hole. If the manifold, throttle cable bracket or related items have been changed, then the alignment and amount the cable is drawn out before and after mid-throttle can be seriously off.
If you're not aware already, here's a link to about the best video demonstrating the details. Maybe with this information you'll be able to tell if your mechanic knows what he's doing , (and so far you explained to us that he clearly doesn't).
It's important to know that the cable isn't "adjusted" to alter shift points. If that's done, then you're on borrowed time and something else is off with the trans.
Good luck.
The video is about 9 minutes long.

Old 02-04-2018, 11:32 PM
  #15  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

One thing i don't understand is my tpi tv cable is too short even though it reached the front of my engine with ease i know it may be something with the bracket but i cant even remember seeing the tv bracket on my car
Old 02-05-2018, 07:35 AM
  #16  
Supreme Member

 
skinny z's Avatar
 
Join Date: Dec 2005
Location: Alberta
Posts: 9,123
Received 625 Likes on 526 Posts
Re: Carb swap

Check out the link in post #4 above. It describes the various TV cables available. I ordered a new one from an auto parts store for a carved 84 V8. Aftermarket bracket as well which will compensate for any small differences in length.
Old 02-05-2018, 02:38 PM
  #17  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

Okay they that the bracket backwards we turned it around and hooked things up still didn't shift thinking the cable is too long, it will only be in 1st and wont shift

Bad Governor?

Last edited by SketchyZed; 02-05-2018 at 02:53 PM.
Old 02-05-2018, 04:02 PM
  #18  
Supreme Member

 
skinny z's Avatar
 
Join Date: Dec 2005
Location: Alberta
Posts: 9,123
Received 625 Likes on 526 Posts
Re: Carb swap

What bracket are you using? And what intake manifold?
Old 02-05-2018, 04:03 PM
  #19  
Supreme Member

 
skinny z's Avatar
 
Join Date: Dec 2005
Location: Alberta
Posts: 9,123
Received 625 Likes on 526 Posts
Re: Carb swap

A picture would be helpful too.
Old 02-06-2018, 12:44 PM
  #20  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

Originally Posted by skinny z
A picture would be helpful too.
the bottom of the bracket for the tv cable was backwards till I got my hands on it

Old 02-06-2018, 12:49 PM
  #21  
Sponsor

iTrader: (92)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 15,393
Received 644 Likes on 569 Posts
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Carb swap

Originally Posted by SketchyZed

That missing governor gear is definitely a issue.
Old 02-06-2018, 08:31 PM
  #22  
Supreme Member

 
skinny z's Avatar
 
Join Date: Dec 2005
Location: Alberta
Posts: 9,123
Received 625 Likes on 526 Posts
Re: Carb swap

Originally Posted by Tuned Performance
That missing governor gear is definitely a issue.
It certainly is. In a big way.



And the loose TV cable, despite the appearance of the proper bracket, makes me wonder if the cable is actually connected inside the transmission. It would certainly explain the slack. Is there any resistance when it's drawn out of the case or is it completely loose? It should get harder to pull the further it's drawn out as it's working against a spring in the valve body.

Last edited by skinny z; 02-06-2018 at 08:35 PM.
Old 02-06-2018, 09:04 PM
  #23  
Member
Thread Starter
 
SketchyZed's Avatar
 
Join Date: Jul 2016
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 camaro z28
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: Carb swap

i got it shifting and got a new gear for the governor gear but i cant get the dust cover on properly and now it has a leak any tips or anything, it was the cable that was causing all this i adjusted it and it shifts gonna take in to a friends who does that for a living and have him adjust the tv cable and throttle cable
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
five7kid
Carburetors
12
10-18-2007 12:54 AM
shipfitter_sjd
Carburetors
1
12-30-2005 03:52 PM
25thanniversZ
Tech / General Engine
12
07-25-2003 10:33 PM



Quick Reply: Carb swap



All times are GMT -5. The time now is 11:41 PM.