from my understanding that the s4 doesnt have a stock TPS on the throtle body. im looking into buy a open face FORD TPS only thing is, will a ford TPS work with the megasquirt or do i have to change something on the board? if i do then what TPS will work with the MS right out the box? a chevy tps?

 

the S4's have a TPS, it just does not sense for the whole range of motion for the throttle. It will sense from closed to right as the 2ndary plates start opening.

All the TPS's i've seen (not just RX-7's) will work with the MS, most of them are just one wire to 5v, one to ground, and one is signal. Most of the MS is built around GM sensors, so im sure one of them would work if you wanted to replace your TPS, but that may be more trouble than its worth

 

The MS will work with just about any TPS.

I'm using it with the Toyota one on the 20v 4age... I've also used it with an S5 wide-range, and the S4 narrow range, all without problems.

Ken

 

oh ok cool then if there is a s4 tps then ill use it . thanks guys now i just have to find what i need to change out on the board lol

 

Just keep in mind that the S4 one won't show you the whole range of throttle movement.

Ken

 

Any variable resistance type TPS will work. I fit a Ford unit, others have used GM, or stock. Just make sure it's a true variable resistance type, not just a switch.

 

Is there any way to tell if a prospective TPS I am looking at is a variable resistance type or just a switch? My S4's TPS just crapped on me, the replacement I scrounged from the junkyard is no better, and I am looking to get a Megasquirt for tuning purposes in the near future.

 

I used one from a 1999 mazda 626, had to make a bracket but it works nice. Full range also.

 

yea, you can tell by just taking an ohmmeter and hooking it up between two of the leads, and press the sensor in slowly. If the resistance goes up (or down, just means you chose the wrong two wires) steadily as you press it, then you're good. If you get a sudden on/off type behavior, then its a switch type, and if you get no change, then try different combinations of wires.

 

Hmm, should've thought of that myself.

 

i just bought a corrvette TPS / from an LS1 . its adjustable kinda like a ford unit. it costed me like 43 bucks which i thought was rather cheap but im not complaining. do i need to put a fuse anywhere on this? or no? its a GM sensor btw.

 

I didn't use any fuses, 5V system. Is it a 3 wire?

 

sorry to miss inform the parts dealer miss informed me of the kind of TPS .come to find out its a ford TPS which since i bought ill stick to it cause it has the design that i am looking for and want to try it. its a ford TPS not GM

 

1. which model Ford is the TPS?

2. does anyone know of a GM unit that will fit the stock throttle body? I ask only because i'm already using GM sensors for everything else, so I just wanted to just keep it all GM if possible.


EDIT: if I had just waited a few more minutes ... https://www.rx7club.com/megasquirt-f...e-fits-906615/

Cliffs Notes: Custom adapter + Custom bracket + 1995 Chevy Cavalier TPS

 

Nothing fits the stock throttle body directly, but it is VERY easy to retrofit the Ford TPS commonly used in Haltech installations (I think Haltech even sells it). A simple bracket is easy to make to hold it in place and the stock throttle shaft bolt gets ground to fit. Or weld a rod to the bolt and fit the rod to the TPS instead of messing up the bolt.