LSA from CTS-V
Thread Starter
Joined: Dec 2006
Posts: 104
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From: Mountain Springs, Texas
LSA from CTS-V Is it possible to rework the stock harness and retain the fuel pump controller etc? Can the ECU be programmed with basic standalone settings to delete VATS etc? Speartech uses new injectors, new ECU etc for their LSA swap harness and they will not rework LSA harnesses. They also do not use the stock fuel pump and controller.
Don
Don
Is it possible to rework the stock harness and retain the fuel pump controller etc? Can the ECU be programmed with basic standalone settings to delete VATS etc? Speartech uses new injectors, new ECU etc for their LSA swap harness and they will not rework LSA harnesses. They also do not use the stock fuel pump and controller.
Don
Don
I don't have answers to your questions, but GM does offer a standalone LSA harness and ECU package.
Andrew
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
The harness and ECU come "free" with a used package. I am trying to see if they can be used to reproduce the stock control systems.
Thanks,
Don
LSA idle fuel pressure is 58, just like all other LS engines:
http://www.chevrolet.com/content/dam...e-19260164.pdf
See page 2.
But you're right, a take out harness is free and if it can be reworked, then that's the way to go.
Andrew
http://www.chevrolet.com/content/dam...e-19260164.pdf
See page 2.
But you're right, a take out harness is free and if it can be reworked, then that's the way to go.
Andrew
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
LSA idle fuel pressure is 58, just like all other LS engines:
http://www.chevrolet.com/content/dam...e-19260164.pdf
See page 2.
But you're right, a take out harness is free and if it can be reworked, then that's the way to go.
Andrew
http://www.chevrolet.com/content/dam...e-19260164.pdf
See page 2.
But you're right, a take out harness is free and if it can be reworked, then that's the way to go.
Andrew
http://www.chevrolet.com/content/dam...d-19259293.pdf
Thanks,
Don
Last edited by dhutton; Oct 13, 2014 at 12:23 PM.
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
Got the GM tech line number from Pace and called them. The requirement is as i quoted, 65 to 85 boost referenced. Tough to do....
He said the data sheet you have is out of date.
Don
He said the data sheet you have is out of date.
Don
They don't exactly flood you with info there.
Stupid question....
If an LSA puts out 9-10 psi and a vacuum reading of 18" of Hg = about 9 psi below atmospheric pressure. Couldn't you just use an efi boost/vacuum referenced regulator set at 65 at idle and let it increase fuel pressure abot 19-20 psi to about 85psi at WOT (10psi boost)?
Stupid question....
If an LSA puts out 9-10 psi and a vacuum reading of 18" of Hg = about 9 psi below atmospheric pressure. Couldn't you just use an efi boost/vacuum referenced regulator set at 65 at idle and let it increase fuel pressure abot 19-20 psi to about 85psi at WOT (10psi boost)?
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Verdad Gallardo Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
They don't exactly flood you with info there.
Stupid question....
If an LSA puts out 9-10 psi and a vacuum reading of 18" of Hg = about 9 psi below atmospheric pressure. Couldn't you just use an efi boost/vacuum referenced regulator set at 65 at idle and let it increase fuel pressure abot 19-20 psi to about 85psi at WOT (10psi boost)?
Stupid question....
If an LSA puts out 9-10 psi and a vacuum reading of 18" of Hg = about 9 psi below atmospheric pressure. Couldn't you just use an efi boost/vacuum referenced regulator set at 65 at idle and let it increase fuel pressure abot 19-20 psi to about 85psi at WOT (10psi boost)?
Other issue is I wanted to run a Vapor Works tank and he has already told me that he does not have a solution for those requirements.
Thanks,
Don
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
Thanks,
Don
I'm not a tuning guru, but what the heck difference does the fuel pressure make when you can size the injectors accordingly? If you have a big enough injector that will correctly atomize fuel, you could run 20 PSI normally aspirated with boost reference raising FP incrementally...
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
The goal here is to avoid changing the injectors. Yes, I could change them but that is not my goal. I want to run it as is. No tuning etc needed then.
Thanks,
Don
Thanks,
Don
Andrew
What chassis is this going into? Why the need for a stock style computer/harness?
Considering Walbro 450lph pumps are used in high HP Nissan GTRs making 1200awhp+ why wouldn't they work on your car?
The GTRs actually have an issue with the fuel vapor locking so a factory Porsche fuel cooler (tapped into the a/c) is made to work and solves that problem.
Considering Walbro 450lph pumps are used in high HP Nissan GTRs making 1200awhp+ why wouldn't they work on your car?
The GTRs actually have an issue with the fuel vapor locking so a factory Porsche fuel cooler (tapped into the a/c) is made to work and solves that problem.
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
Don
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
What chassis is this going into? Why the need for a stock style computer/harness?
Considering Walbro 450lph pumps are used in high HP Nissan GTRs making 1200awhp+ why wouldn't they work on your car?
The GTRs actually have an issue with the fuel vapor locking so a factory Porsche fuel cooler (tapped into the a/c) is made to work and solves that problem.
Considering Walbro 450lph pumps are used in high HP Nissan GTRs making 1200awhp+ why wouldn't they work on your car?
The GTRs actually have an issue with the fuel vapor locking so a factory Porsche fuel cooler (tapped into the a/c) is made to work and solves that problem.
The Walbro pump will work as I stated above but a PWM controller is not readily available and I have heard they do not last long when used with PWM controller. Without PWM control I have concerns about fuel heating when sitting in traffic etc. The Porsche fuel cooler sounds intriguing but probably beyond my limited technical abilities... :>)
Thanks,
Don
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Don......I have stock injectors in my car. The engine came out of a totaled (roll over) ZL1 camaro. I have the stock ZL1 pump in a Ricks Vaporworx tank with Carls control system Works perfectly with all the stock parts
Ken
Ken
Thread Starter
Joined: Dec 2006
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From: Mountain Springs, Texas
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The Vaporworx system is so easy to install is ridiculous...........Sensor in the fuel line at the tank and a module mounted near the Battery...........Sensor talks to the module and the module sends voltage to the pump to keep the pressure right where its set to be............Sensor, Module and a few wires Problem gone....
Ken
Ken
Thread Starter
Joined: Dec 2006
Posts: 104
Likes: 3
From: Mountain Springs, Texas
The Vaporworx system is so easy to install is ridiculous...........Sensor in the fuel line at the tank and a module mounted near the Battery...........Sensor talks to the module and the module sends voltage to the pump to keep the pressure right where its set to be............Sensor, Module and a few wires Problem gone....
Ken
Ken
I agree, the Vaporworks is a great product. It just can't support the specified LSA requirements without extensive tuning. This is also the reason that Spearworks supplies new injectors with their LSA setup, to allow fixed pressure without boost referencing. It would be interesting to see the duty cycle of the injectors in your tune at WOT Ken.
Thanks,
Don