HP and T-Tops
Thread Starter
Senior Member

Joined: Apr 2002
Posts: 531
Likes: 0
From: Northern New Jersey
Car: 91 Firebird Formula
Engine: For me to know.....
Transmission: and you to find out....
HP and T-Tops
Ok..I got somewhat of a dumb question to ask......
Ive been told that you CAN'T go crazy building up a motor if you car has T-tops. Is this true?? I understand the fact that having T-Tops is a weaker construction than a hard top. I was told from another person that IF you do build the motor up you can add addittional support to the chassis to make it stronger. Can someone please tell whats truth and whats
???
Thanks in advance....
Ive been told that you CAN'T go crazy building up a motor if you car has T-tops. Is this true?? I understand the fact that having T-Tops is a weaker construction than a hard top. I was told from another person that IF you do build the motor up you can add addittional support to the chassis to make it stronger. Can someone please tell whats truth and whats
???Thanks in advance....
I think that is mostly
b/c there are many guys on this board w/ big hp and torque numbers w/ T-tops. It is true that the T-tops take a lot of strength or "stability" out of the car, but this can be cured w/ a set of subframe connectors. These are a must for any t-top 3rd gen. I am getting ready to order my from Spohn.
b/c there are many guys on this board w/ big hp and torque numbers w/ T-tops. It is true that the T-tops take a lot of strength or "stability" out of the car, but this can be cured w/ a set of subframe connectors. These are a must for any t-top 3rd gen. I am getting ready to order my from Spohn. TGO Supporter


Joined: Jul 2001
Posts: 4,991
Likes: 1
From: Cheyenne, Wyoming
Car: 1992 B4C 1LE
Engine: Proaction 412, Accel singleplane
Transmission: built 700R4 w/custom converter
Axle/Gears: stock w/later 4th gen torsen pos
two words; subframe connectors. check with SPOHN (look at top of your screen at the banner)
Trending Topics
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
I have heard that too,
I have heard a million people say some simular about t top camaros. they tole me that they do not run as fast as the hard tops. When question further they did not really know why they just seem to say it.
I think they are just jelous, I love my ttops
:lala: :lala: :lala:
I think they are just jelous, I love my ttops
:lala: :lala: :lala:
Senior Member
Joined: Oct 2001
Posts: 930
Likes: 0
From: Timrå, Sweden
Car: 1984 Corvette
Engine: Turbo 350
Transmission: 4L80E with TCI T-Com
My friend has a 86 IROC with t-tops and it <b>IS</b> electronically speed limited to 200 kph ( 125 mph ). At high speed there is a high vaccum above the t-tops and as I understand the targa locks are not designed to hold at a higher speed. (some saftey factor added ).
I don't think that the non targa cars have that speed limit.
I don't think that the non targa cars have that speed limit.
Originally posted by JoBy
My friend has a 86 IROC with t-tops and it <b>IS</b> electronically speed limited to 200 kph ( 125 mph ). At high speed there is a high vaccum above the t-tops and as I understand the targa locks are not designed to hold at a higher speed. (some saftey factor added ).
I don't think that the non targa cars have that speed limit.
My friend has a 86 IROC with t-tops and it <b>IS</b> electronically speed limited to 200 kph ( 125 mph ). At high speed there is a high vaccum above the t-tops and as I understand the targa locks are not designed to hold at a higher speed. (some saftey factor added ).
I don't think that the non targa cars have that speed limit.
i have taken my car up to 135mph when it was stock and my t-tops didn't go anywhere and didn't encounter any speed limit
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
Umm..
Ok, maybe you will not go air borne, but does that mean you have less traction?
Do you know if that is with tops on or off or does it even make a diference?
thanks:hail: :hail: :hail:
Do you know if that is with tops on or off or does it even make a diference?
thanks:hail: :hail: :hail:
Senior Member
Joined: Oct 2001
Posts: 930
Likes: 0
From: Timrå, Sweden
Car: 1984 Corvette
Engine: Turbo 350
Transmission: 4L80E with TCI T-Com
The speedo might be mecanical but the ECM still knows the vehicle speed. I know this because when I hook up my ALDL scanner (WinALDL) to his car MPH is displayed on the laptop. There must be a pulse sender somewhere on the speedo wire that provides the ECM with that information.
I did't say that the targas would blow off if you went faster. Just that the ECM has a speed limit to make sure. They might have removed that on the 89, but my friends 86 IROC ( 305 TPI ) has the speed limit.
I did't say that the targas would blow off if you went faster. Just that the ECM has a speed limit to make sure. They might have removed that on the 89, but my friends 86 IROC ( 305 TPI ) has the speed limit.
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
=\
I did not think they would pop off. I was just wondering if the low pressure spot above the car would affect the rear whell traction or anything?
thanks :hail: :hail: :hail:
thanks :hail: :hail: :hail:
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
oh =(
I knew audi TTs had a lot of lift, something like 80 poeple were killed in germany just from driving at high speeds, that was when they first came out.
That is why they have the small fin thing on them now.
That is why they have the small fin thing on them now.
Senior Member
Joined: Oct 2001
Posts: 930
Likes: 0
From: Timrå, Sweden
Car: 1984 Corvette
Engine: Turbo 350
Transmission: 4L80E with TCI T-Com
These are some numbers I found. It is front / rear lift ( lbs ) at 130 mph.
84 Corvette : 148 / 55
82 Camaro : 239 / 40
82 porsche 928 : 232 / 173
82 Toyota Supra : 290 / 57
82 Datsun 280ZX : 174 / 116
84 Corvette : 148 / 55
82 Camaro : 239 / 40
82 porsche 928 : 232 / 173
82 Toyota Supra : 290 / 57
82 Datsun 280ZX : 174 / 116
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
WOW
That is alot of lift in the front of the camaro, did not think there would be that much,
I am not sure waht to say about that.
It is bad if I lose too much weight up front?
I am not sure waht to say about that.
It is bad if I lose too much weight up front?
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
This reminds me
AS anyone seen the movie Cannon Ball run???
It is the 70's movie. There is a lamborghini with 2 spoilers on it, one on the rear and one one the nose.
It looks butt ugly but it made me think alittle.
:lala: :lala: :lala:
It is the 70's movie. There is a lamborghini with 2 spoilers on it, one on the rear and one one the nose.
It looks butt ugly but it made me think alittle.
:lala: :lala: :lala:
I can believe the thing about high speed with t-tops on. I forget the exact equation, but when air is moving at high speeds, the pressure drops creating lift (that's how airplains fly, wings are designed so air on the top of the wing moves faster than air on the bottom), so relive to the t-tops, the air in the car is still, and if the air outside was moving at 125, the diference in pressure would be very high.
I'll stick with my hardtop, even though i don't plan on going over 130 any time soon.
I'll stick with my hardtop, even though i don't plan on going over 130 any time soon.
Senior Member
Joined: Jul 2000
Posts: 580
Likes: 0
From: Charlotte, NC
Car: 1989 Camaro RS
Engine: 355 mildly modified
Transmission: 700R4 fully modified
I don't think that you'll have any problems with a lost t-top, I've had my car at about 135 and there weren't any problems. I have heard of, and actually saw it on one of the old 70's mustangs with the t-tops, where the torque going through the frame had caused so much twist that the tops have shattered. GM took care of that problem though by switching from glass over to safety glass in the mid80's. Nothing was neater though then seeing that top just shatter, but I don't think I'd want it to bust on me.
I could see a problem with the tops lifting off if you were to only have one removed and the other locked in. THats probably why GM says to either remove them both or don't remove them at all.
-=-Mike
I could see a problem with the tops lifting off if you were to only have one removed and the other locked in. THats probably why GM says to either remove them both or don't remove them at all.
-=-Mike
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
:D
wish I could see a movie of that mustang shattering a T-Top. That sonds nice
would not want it to happen to me though.
:lala: :lala: :lala:
would not want it to happen to me though.
:lala: :lala: :lala:
TGO Supporter


Joined: Jul 2001
Posts: 4,991
Likes: 1
From: Cheyenne, Wyoming
Car: 1992 B4C 1LE
Engine: Proaction 412, Accel singleplane
Transmission: built 700R4 w/custom converter
Axle/Gears: stock w/later 4th gen torsen pos
I believe that for two reasons, 1) saw one flyoff at the dragstrip and break 2) at 151 mph in my B4C it was so loud from the wind noise (even without having t-tops) that if I yelled something to the passenger he would not have heard it.
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
Umm...
What is a B4C?
Sorry, I don't mean to sound like an idiot. I have been them a few places on this board and I am wondering. I am guessing it is a type of car.
thanks:hail: :hail: :hail:
Sorry, I don't mean to sound like an idiot. I have been them a few places on this board and I am wondering. I am guessing it is a type of car.
thanks:hail: :hail: :hail:
TGO Supporter


Joined: Jul 2001
Posts: 4,991
Likes: 1
From: Cheyenne, Wyoming
Car: 1992 B4C 1LE
Engine: Proaction 412, Accel singleplane
Transmission: built 700R4 w/custom converter
Axle/Gears: stock w/later 4th gen torsen pos
Re: Umm...
Originally posted by Trux
What is a B4C?
Sorry, I don't mean to sound like an idiot. I have been them a few places on this board and I am wondering. I am guessing it is a type of car.
thanks:hail: :hail: :hail:
What is a B4C?
Sorry, I don't mean to sound like an idiot. I have been them a few places on this board and I am wondering. I am guessing it is a type of car.
thanks:hail: :hail: :hail:
Thread Starter
Senior Member

Joined: Apr 2002
Posts: 531
Likes: 0
From: Northern New Jersey
Car: 91 Firebird Formula
Engine: For me to know.....
Transmission: and you to find out....
pics of sub frame connectors???
does anyone here have any pics of subframe connectors on their Camaro/ Firebird??? I looked at Spohn's website and they DID offer pictures but their pictures look like sh#t! Also are sub frame connectors a simple bolt on or is more involved than that???
Thanks in advance....
Thanks in advance....
Senior Member
Joined: Jul 2000
Posts: 580
Likes: 0
From: Charlotte, NC
Car: 1989 Camaro RS
Engine: 355 mildly modified
Transmission: 700R4 fully modified
they usually just bolt right in depending on the kind that you get but you usually want to reinforce it by welding everything together. I don't have any pics though since I haven't done it to my car yet
Senior Member
Joined: Mar 2002
Posts: 591
Likes: 0
From: portland, Maine USA
Car: grand prix/84 z28
Engine: 4.6 Northstar
Transmission: t-56
=)
Thanks for the subframe pics:hail: :hail: :hail:
What is the wash bottle for?
At first I thought it was water injection or something but I have not clue right now.
Thanks again:hail: :hail: :hail:
What is the wash bottle for?
At first I thought it was water injection or something but I have not clue right now.
Thanks again:hail: :hail: :hail:
Thread
Thread Starter
Forum
Replies
Last Post
1Aauto
Sponsored Vendors
1
Jan 15, 2016 06:26 AM
Thirdgen89GTA
NW Indiana and South Chicago Suburb
4
Nov 26, 2015 11:04 PM





