LS1 into LT1 Fbody Help
Sorry it took me so long to reply....I forgot I posted in this thread 
For the fuel system on both cars that I was involved in, I retained the stock LT1 fuel tank and stock LT1 lines. However, I did change the front portion (braided) of the lines and ran the feed into an Aeromotive regulator. The return line came off the regulator since the LS1 rail only has a feed....unless you use the vette rail/regulator (expensive). So, in the end it was much cheaper to buy the Aeromotive regulator and braided line than to buy the LS1 corvette rail/regulator setup that already has the return.
As for the rack....you cannot use the LT1 rack (from my experience) as already mentioned by 765Joey
Thanks
Jason
For the fuel system on both cars that I was involved in, I retained the stock LT1 fuel tank and stock LT1 lines. However, I did change the front portion (braided) of the lines and ran the feed into an Aeromotive regulator. The return line came off the regulator since the LS1 rail only has a feed....unless you use the vette rail/regulator (expensive). So, in the end it was much cheaper to buy the Aeromotive regulator and braided line than to buy the LS1 corvette rail/regulator setup that already has the return.
As for the rack....you cannot use the LT1 rack (from my experience) as already mentioned by 765Joey
Thanks
Jason
Joined: Sep 2004
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From: Downers Grove, IL
Originally Posted by 765joey
I had to change to a LS1 steering rack my driver side header hit the LT1 steering rack knuckle when I converted over
the LS1 IS a return system!! The fuel pressure regulator is in the tank. running straight line will make the pressure too high.
Get ahold of me on AIM and I'll help you out man.
Get ahold of me on AIM and I'll help you out man.
If you use an LS1 tank you still need to make up a return line and a pressure line... The LS1 pressure line has a 3 way block right after the fuel filter that has one line going to the tank for the regulator that is in tank.
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Couldn't you use a fuel rail from a 97 vette? It has the return line and a FPR on the fuel rail.
I am in the process of doing this swap as well. I got everything cheap so it shouldn't be too bad. Almost everything.
If I install a 98 cluster and repin the cluster plug, will my gauges work?
I am in the process of doing this swap as well. I got everything cheap so it shouldn't be too bad. Almost everything.
If I install a 98 cluster and repin the cluster plug, will my gauges work?
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From: Georgetown, IL 61846-1105
Just send your harness, and LS1 PCM out to SpearTech and have them rework it, so it's plug and play with the LT1 car, also have them change your tach setup to a 4 cyl signal, instead of an 8 cyl, and your cluster will work.
As for the fuel, yes I could use the Vette Rails, but I wanna have a clean show like install, so I am gonna run braided line up, and make a return with an inline fuel regulator.
As for the fuel, yes I could use the Vette Rails, but I wanna have a clean show like install, so I am gonna run braided line up, and make a return with an inline fuel regulator.
I have done this swap. Tell me why I blocked off my return line on my LT1 fuel line in the engine bay for the LS1 motor and I am using the LT1 tank just with a diff. Fuel Pump. As I can remember only LS1 that was return is the 97' vette LS1.
All of them have returns... F-bodys just did not have a full return line... like I said above there is a block by the filter to go back to the tank and the regulator in in tank
Joined: Nov 2001
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From: Anderson, Indiana
It's always easiest to leave the fuel tank, plumbing, and instrument cluster alone when doing these swaps. Think of all the connectors and wiring you DON'T have to mess with when you leave the stock tank and cluster in place.
If you can get a 97-98 Corvette fuel rail, that's a great way to simplify the fuel line hookup! No modifications required at all then. Of course if you are changing to braided line or something else, then it doesn't matter, but if you are trying to do this the easiest way possible, the 97-98 Vette fuel rail is even easier than fitting the Vette fuel filter/regulator assembly to the car.
If you can get a 97-98 Corvette fuel rail, that's a great way to simplify the fuel line hookup! No modifications required at all then. Of course if you are changing to braided line or something else, then it doesn't matter, but if you are trying to do this the easiest way possible, the 97-98 Vette fuel rail is even easier than fitting the Vette fuel filter/regulator assembly to the car.
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
what if i had a 99 tank and the lines to the front of the car, i heard the sending units are diff but you can set up the lt1 unit inside the ls1 tank, if so, then all you have to do is rewire the harness right before the tank in yout lt1 car with the ls1 connector, then the tank and lines will be a direct replacement?
also does anyone know the specific wires that go into the lt1 tank?
also does anyone know the specific wires that go into the lt1 tank?
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From: Georgetown, IL 61846-1105
Originally Posted by daniel6718
what if i had a 99 tank and the lines to the front of the car, i heard the sending units are diff but you can set up the lt1 unit inside the ls1 tank, if so, then all you have to do is rewire the harness right before the tank in yout lt1 car with the ls1 connector, then the tank and lines will be a direct replacement?
also does anyone know the specific wires that go into the lt1 tank?
also does anyone know the specific wires that go into the lt1 tank?
The LT1 pump will not work for an LS1, LS1's run on 58psi, where LT1's were 43.5psi I believe, so unless you had an inline pump booster. You wont be supplying enough fuel. You can make your LT1 setup work for $500.00 ALL NEW FUEL SYSTEM being braided and all...from the tank up using braided line, and an -AN fittings....
If this is not for you, there have been a few guys contact me with complete fuel setups out of cars, that I could direct to you...
Joined: Nov 2001
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From: Anderson, Indiana
The fuel pressure the engine runs at is the REGULATED pressure, not the pump capable pressure.
Most of these in-tank pumps are rated anywhere from 90-125 psi deadhead pressure. The fuel pressure regulator determines what pressure the engine actually runs at, not the pump.
On the first LS1 swap we did here (my 91 Z28) we left the stock TPI pump in place and it ran the LS1 at 58 psi just fine. The stock TPI pump carried that car to 11.60's at 116 MPH in the quarter. It wasn't until we supercharged the LS1 that more fuel pump was needed.
The stock LT1 fuel pump will run the LS1 at 58 psi just fine!
Most of these in-tank pumps are rated anywhere from 90-125 psi deadhead pressure. The fuel pressure regulator determines what pressure the engine actually runs at, not the pump.
On the first LS1 swap we did here (my 91 Z28) we left the stock TPI pump in place and it ran the LS1 at 58 psi just fine. The stock TPI pump carried that car to 11.60's at 116 MPH in the quarter. It wasn't until we supercharged the LS1 that more fuel pump was needed.
The stock LT1 fuel pump will run the LS1 at 58 psi just fine!
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
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From: Georgetown, IL 61846-1105
Thanks John, I stand corrected....
So take $100 off the price I said of $500 and that's a hell of a price for a braided setup with an Aeromotive Inline regulator
So take $100 off the price I said of $500 and that's a hell of a price for a braided setup with an Aeromotive Inline regulator