lt1 tps vs tpi tps
Thread Starter
Racer
Joined: Apr 2003
Posts: 383
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From: triangle NC
lt1 tps vs tpi tps
I have a 58mm tb off my tpi car I want to put on my lt1 car. Are the voltage signals the same between the different tps's? If I just splice the different conectors will I be OK?
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Re: lt1 tps vs tpi tps (87Z-ya)
First I can't answer your questiob definitively.
Hope this is not wasting your time.
I don't have an LT1 car but the TPS LOOK the same.
5 volts is a standard TTL (transistor-transistor logic level) used in the ECM.
(TTL logic levels have been used for YEARS...nothing new)
There would be no need to change this for the LT1 MPFI.
The TPS is a simple mechanical 'volumn control' device. A 'potentiometer' to be exact.
One lead goes to ground,one to +5 volts and the center lead is the reference signal (DC Voltage) to the ECM.
So, my 'uneducated' guess sez it will work perfectly.
What about the IAC? That's a different type of device.
Are the plugs the same for it? Again there's a 95% chance it will work,also.
It is just providing a calibrated 'air leak'.
Hope this is not wasting your time.
I don't have an LT1 car but the TPS LOOK the same.
5 volts is a standard TTL (transistor-transistor logic level) used in the ECM.
(TTL logic levels have been used for YEARS...nothing new)
There would be no need to change this for the LT1 MPFI.
The TPS is a simple mechanical 'volumn control' device. A 'potentiometer' to be exact.
One lead goes to ground,one to +5 volts and the center lead is the reference signal (DC Voltage) to the ECM.
So, my 'uneducated' guess sez it will work perfectly.
What about the IAC? That's a different type of device.
Are the plugs the same for it? Again there's a 95% chance it will work,also.
It is just providing a calibrated 'air leak'.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Re: lt1 tps vs tpi tps (VetNutJim)
Voltage levels are the same for both TPS sensors. The earlier L98 TB had the older flat style connector vs the new round body connector on the newer TPS sensors. Wire colors are the same as well.
As fo the IAC, there was some different designed IACs from the earlier years, however operationally they are the same as is voltage levels to the IAC. Worse case scenario is to have to splice in a conector for a later model IAC. Just match the wire colors as that hasn't changed in the last few years.
As fo the IAC, there was some different designed IACs from the earlier years, however operationally they are the same as is voltage levels to the IAC. Worse case scenario is to have to splice in a conector for a later model IAC. Just match the wire colors as that hasn't changed in the last few years.
Instructor
Joined: Jun 2003
Posts: 118
Likes: 0
From: Edmonton_visitor Alberta
Re: lt1 tps vs tpi tps (87Z-ya)
I've done same but reverse. LT1 throttle body on TPI plennum. I had to make a cable adapter out of old TPI TPS and LT1 TPS connector plug.
You will have to plug high vacuum port on the TPI throttle body and figure out linkage geometry.
You will have to plug high vacuum port on the TPI throttle body and figure out linkage geometry.
