HO throttle body and senors on RENIX?

[mattbred]

I was thinking about this the other day..

What is incompatible with using the HO throttle body and intake with a RENIX ECU platform?

Does the IAC work the exact same?
Does the TPS still take in about 5 volts, and output about 0.8 volts on the ECU side at idle?

If so, couldn't the harnesses be modified to work with the RENIX era? If someone has a multimeter, could you backprove the TPS at idle position with key ON engine OFF and see what the input/output voltages are? Thanks.

 

[89xj]

you need to adapt the renix tps to the ho throttle body. i dont think the ho intake will match the ports on the renix head. better to swap the ho head, intake, TB, and header and downtube.

hesco sells an adapter for the tps or you can make one.

do a search, there is a bunch of info on this swap.

 

[mattbred]

you need to adapt the renix tps to the ho throttle body. i dont think the ho intake will match the ports on the renix head. better to swap the ho head, intake, TB, and header and downtube.

hesco sells an adapter for the tps or you can make one.

do a search, there is a bunch of info on this swap.

That's not what I'm asking.

I'm asking if the HO TPS can be used with the ECU fuel injection system. Ofcourse I'd end up swapping the head as well, with a new header, but theoretically will the HO TPS and IAC work with the RENIX fuel injection system?

 

[89xj]

That's not what I'm asking.

I'm asking if the HO TPS can be used with the ECU fuel injection system. Ofcourse I'd end up swapping the head as well, with a new header, but theoretically will the HO TPS and IAC work with the RENIX fuel injection system?

no, the tps wont work. thats why hesco makes a kit to swap the renix tps to the HO TB when using the renix fuel injection/ecu.

as for the IAC, i beleive you use the HO iac on the HO tb and dont need to use the renix IAC. with the HO TB, the IAC pintle needs to be longer than the renix IAC.

 

[mattbred]

no, the tps wont work. thats why hesco makes a kit to swap the renix tps to the HO TB when using the renix fuel injection/ecu.

as for the IAC, i beleive you use the HO iac on the HO tb and dont need to use the renix IAC. with the HO TB, the IAC pintle needs to be longer than the renix IAC.

Ok, good info, but; why won't the HO TPS work? Is the output voltage not the same? It still has 3 terminals right? I don't have an automatic so all I need is the information to the ECU. The 0.8 volts at idle, and 4.whatever at WOT.

 

[89xj]

i believe the renix tps is mechanically different than the HO. maybe it would be different since you have the manual tranny though.

do a parts search on napa or rockauto to see the physical difference between the two.

im not sure what the HO tps looks like as i have the manual trans in my renix also.

 

[Muad'Dib]

Ok, good info, but; why won't the HO TPS work? Is the output voltage not the same? It still has 3 terminals right? I don't have an automatic so all I need is the information to the ECU. The 0.8 volts at idle, and 4.whatever at WOT.

IIRC the OBD1 TPS in the HO reads backwards compared to the RENIX TPS. So instead of the ECU reading the TPS voltage from say a lower voltage to a higher voltage, it reads it from a higher voltage to a lower voltage.

I always thought that you used the IAC from the RENIX (well i always read and thought that ALL renix sensors get used). I still have yet to do the swap though... and i wont till i build my stroker.

 

[Muad'Dib]

i believe the renix tps is mechanically different than the HO. maybe it would be different since you have the manual tranny though.

do a parts search on napa or rockauto to see the physical difference between the two.

im not sure what the HO tps looks like as i have the manual trans in my renix also.

IIRC the HO physical difference is only that it doesnt have an arm at the end of the TPS shaft that contacts the thottle plate shaft as it opens / closes.

 

[89xj]

IIRC the HO physical difference is only that it doesnt have an arm at the end of the TPS shaft that contacts the thottle plate shaft as it opens / closes.

thanks, i knew there was a difference, i just couldnt put my finger on it.

 

[markaboo929]

no, the tps wont work. thats why hesco makes a kit to swap the renix tps to the HO TB when using the renix fuel injection/ecu.

yes it will if you slot the holes for it to be adjustable AND you remove the 5 volt reference to the sensor and use a map adjuster to bring the volts to @ 7 volts and it WILL be able to go from .8 v to a full 5v at WOT-if you use the stock 5v reference it will only go to @ 3.8 v at WOT- mine works like a charm!!

 

[mattbred]

So in theory it might work after all.

The whole idea for me was to try and make it non adjustable though. Personally I don't like the fact that it's adjustable, as the screws can loosen over time, or you can be like me and snap the screw while tightening it down, and screwing up the threads in the TB.

 

[markaboo929]

not in theory,but factuality!!! if you play with the voltage setting you can adjust it till its .8 v at idle BUT it probably wont get to 5 v at WOT,have'nt tried that though.either way it does work and my 03 grand rokee 4.0 uses the factory tps ran by my renix ecm(mines an 88),plus the chevy ls1 timming control unit i "fused " into my wiring!!:woohoo:

 

[mattbred]

Well to be honest, I don't believe my TPS goes all the way to 5 volts at WOT anyways. Somewhere around 4.

Does the HO TPS take 5 volts input as well? And at idle position what is it's output? With an umolested sensor/wiring like.

Edit: The FSM calls for 4.2 volts at idle on the transmission side, which is 4.2 volts WOT on the ECU side. (It's direct opposite)