LS2 Intake and 90MM TB install on LSx engine
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
LS2 Intake and 90MM TB install on LSx engine http://forums.corvetteforum.com/showthread.php?t=875879
LS2 intake asm will bolt on an LSX engine,
It will require
The new fuel rails and lower injector o-rings seals and .300" rail spacers to make up the different in height between the injectors.
The original current rail can be use with a buncha tweaking, but the new LS2 are a much larger diameter.
90MM LS2 drive by wire throttle body can be retro wired to current PCM and be fully functional.
Extend MAP sensor (use current lsx sensor ) wiring 21� to reach the front from current rear position.
Current fuel rail covers will not directly bolt on, but will with a tweak to the fuel inlet and some tweaking with a die grinder
All the current Brake Booster,PCV lines etc as well at the 4"OD inlet hose are the same.
90MM LS2 Throttle body will work with the following information
PIN ID LS2 90mm
A.) ACT2
B.) ACT1
C.) +5v TPS Reference – Common to both TPS’s
D.) TP1 Signal 0-5v
E.) Common Ground
F.) TP2 Signal 5-0v
98-04 Wiring hookup
A.) ACT 2 - Brown
B.) ACT 1 - Yellow
C.) +5 TPS Dk Green/Wht
D.) TP1 Signal – Drak Blue
E.) TPS GND – Purple
F.) TP2 Signal – Pink
Yes it works better and much cheaper than an LSX manifold, and the drivability of the 90mm TB is very good. The bell shaped entrys into the runners seem to work very well. They also moved the injector entry higher in the runner, so not it does not block the port roof.
PN are avail at your local dealer..it can be weasled if you know how. Should be avail straight up in less than 4 weeks. The only major snag for most will be the new style connector for the throttlebody. I suspect most will use the old style packard pins on them (they fit) and solder and epoxy them in place. The Delphi part #'s have not hit the market yet, it is the new corporate standard plugs so they will be used in a lot of different applications.
LS2 intake asm will bolt on an LSX engine,
It will require
The new fuel rails and lower injector o-rings seals and .300" rail spacers to make up the different in height between the injectors.
The original current rail can be use with a buncha tweaking, but the new LS2 are a much larger diameter.
90MM LS2 drive by wire throttle body can be retro wired to current PCM and be fully functional.
Extend MAP sensor (use current lsx sensor ) wiring 21� to reach the front from current rear position.
Current fuel rail covers will not directly bolt on, but will with a tweak to the fuel inlet and some tweaking with a die grinder
All the current Brake Booster,PCV lines etc as well at the 4"OD inlet hose are the same.
90MM LS2 Throttle body will work with the following information
PIN ID LS2 90mm
A.) ACT2
B.) ACT1
C.) +5v TPS Reference – Common to both TPS’s
D.) TP1 Signal 0-5v
E.) Common Ground
F.) TP2 Signal 5-0v
98-04 Wiring hookup
A.) ACT 2 - Brown
B.) ACT 1 - Yellow
C.) +5 TPS Dk Green/Wht
D.) TP1 Signal – Drak Blue
E.) TPS GND – Purple
F.) TP2 Signal – Pink
Yes it works better and much cheaper than an LSX manifold, and the drivability of the 90mm TB is very good. The bell shaped entrys into the runners seem to work very well. They also moved the injector entry higher in the runner, so not it does not block the port roof.
PN are avail at your local dealer..it can be weasled if you know how. Should be avail straight up in less than 4 weeks. The only major snag for most will be the new style connector for the throttlebody. I suspect most will use the old style packard pins on them (they fit) and solder and epoxy them in place. The Delphi part #'s have not hit the market yet, it is the new corporate standard plugs so they will be used in a lot of different applications.
TECH Fanatic
Joined: Nov 2001
Posts: 1,695
Likes: 9
From: Raleigh, NC
Originally Posted by J-Rod
http://forums.corvetteforum.com/showthread.php?t=875879
LS2 intake asm will bolt on an LSX engine,
It will require
The new fuel rails and lower injector o-rings seals and .300" rail spacers to make up the different in height between the injectors.
The original current rail can be use with a buncha tweaking, but the new LS2 are a much larger diameter.
90MM LS2 drive by wire throttle body can be retro wired to current PCM and be fully functional.
Extend MAP sensor (use current lsx sensor ) wiring 21� to reach the front from current rear position.
Current fuel rail covers will not directly bolt on, but will with a tweak to the fuel inlet and some tweaking with a die grinder
All the current Brake Booster,PCV lines etc as well at the 4"OD inlet hose are the same.
90MM LS2 Throttle body will work with the following information
PIN ID LS2 90mm
A.) ACT2
B.) ACT1
C.) +5v TPS Reference – Common to both TPS’s
D.) TP1 Signal 0-5v
E.) Common Ground
F.) TP2 Signal 5-0v
98-04 Wiring hookup
A.) ACT 2 - Brown
B.) ACT 1 - Yellow
C.) +5 TPS Dk Green/Wht
D.) TP1 Signal – Drak Blue
E.) TPS GND – Purple
F.) TP2 Signal – Pink
Yes it works better and much cheaper than an LSX manifold, and the drivability of the 90mm TB is very good. The bell shaped entrys into the runners seem to work very well. They also moved the injector entry higher in the runner, so not it does not block the port roof.
PN are avail at your local dealer..it can be weasled if you know how. Should be avail straight up in less than 4 weeks. The only major snag for most will be the new style connector for the throttlebody. I suspect most will use the old style packard pins on them (they fit) and solder and epoxy them in place. The Delphi part #'s have not hit the market yet, it is the new corporate standard plugs so they will be used in a lot of different applications.
LS2 intake asm will bolt on an LSX engine,
It will require
The new fuel rails and lower injector o-rings seals and .300" rail spacers to make up the different in height between the injectors.
The original current rail can be use with a buncha tweaking, but the new LS2 are a much larger diameter.
90MM LS2 drive by wire throttle body can be retro wired to current PCM and be fully functional.
Extend MAP sensor (use current lsx sensor ) wiring 21� to reach the front from current rear position.
Current fuel rail covers will not directly bolt on, but will with a tweak to the fuel inlet and some tweaking with a die grinder
All the current Brake Booster,PCV lines etc as well at the 4"OD inlet hose are the same.
90MM LS2 Throttle body will work with the following information
PIN ID LS2 90mm
A.) ACT2
B.) ACT1
C.) +5v TPS Reference – Common to both TPS’s
D.) TP1 Signal 0-5v
E.) Common Ground
F.) TP2 Signal 5-0v
98-04 Wiring hookup
A.) ACT 2 - Brown
B.) ACT 1 - Yellow
C.) +5 TPS Dk Green/Wht
D.) TP1 Signal – Drak Blue
E.) TPS GND – Purple
F.) TP2 Signal – Pink
Yes it works better and much cheaper than an LSX manifold, and the drivability of the 90mm TB is very good. The bell shaped entrys into the runners seem to work very well. They also moved the injector entry higher in the runner, so not it does not block the port roof.
PN are avail at your local dealer..it can be weasled if you know how. Should be avail straight up in less than 4 weeks. The only major snag for most will be the new style connector for the throttlebody. I suspect most will use the old style packard pins on them (they fit) and solder and epoxy them in place. The Delphi part #'s have not hit the market yet, it is the new corporate standard plugs so they will be used in a lot of different applications.
I know this is a little off topic, but the dyno numbers posted in this forum for the GTO were a little bit of a shock to me. It just seemed to me that the 4"bore, with the 90mm TB, better intake, better manifolds, 10.9:1 cr would add up to a little more power. I guess it is just a testament to the fact that the LS1, 6 engines were pretty darn good to go...The camshaft was the biggest limitation
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
that is GOOD NEWS! Now we need to test a TPIS or FAST 90mm T-body on an F-body that isnt drive by wire 
Any dyno comparisions to the LS6 intake?
That setup with a bigger MAF and custom intake will do wonders
Any dyno comparisions to the LS6 intake?
That setup with a bigger MAF and custom intake will do wonders
My question is how much cheaper than a FAST 90mm setup? Especially with the new LS2 fuel rail you should buy. And does it have extra material to allow for port matching to heads like the LSX?
Trending Topics
TECH Apprentice
Joined: Jan 2004
Posts: 305
Likes: 0
Originally Posted by 11 Bravo
My question is how much cheaper than a FAST 90mm setup? Especially with the new LS2 fuel rail you should buy. And does it have extra material to allow for port matching to heads like the LSX?
