as i am searching and reading like mad lately i came up with one question. for those who have ms or the 240sx TB. does a 240 TPS fit on the stock throttle body. i have a 60mm weber unit and really dont want to buy a 240 one. apparently you can run ms on map sensor in alpha mode, but apparently it doesnt drive as nice as if you have a tps. the stock tps only reads at idle and wot so its no good to ms.

 

The 240sx 60mm TB uses a different mount for the TPS than the stock 280zx one. But, the 60mm TPS only has the idle switch, nothing else... just on or off.

See pics:

 

so the 240sx tps is exactly the same function as the 280zx one??? hmmmmm. why does everybody use that tps then?

 

It's the same as the 280zxt one. The 280zx n/a has the idle switch AND the full throttle switch. I imagine people use the 240sx one because it has the pig tail for other connections too. It's not a potentiometer though... that's the main thing.

 

Why not convert to z31 or z32 EFI and nistune it? You'd have control over everything like MS, and it would open up to a whole bunch of doors for various electronic gadgets.

 

because i got my ms2 v3.57 and mallory optical dizzy from fubar in trade for my tripple dcoe40's. i find it odd so many people say they need the 240 tps. weird. technically you dont even need it, but for drivablity it really helps. so far its the only thing stumping me. nistune is great but it would have cost some more out of my pocket. plus i havent researched it enough to know it full potential.

 

i got why everyone is using the 240sx one. there are 2 connectors, one that is exactly like ours, on/off same plug. then there is a pigtail coming out, it is the potentiometer and gives full sweep of where the throttle is. apparently the auto trans cars only had the pigtail, and no switch. took me long enough to read about that one.

 

^^^ Interesting. That third pic I posted of the red 240sx TPS has a pigtail. I took it all apart and never saw any kind of potentiometer sweep. I thought the pigtail wires were connected to the main TPS plug wires... but looking close at that pic, I'd say there is a separate circuit board. I think I need to cut open another and check.

 

the red part is sitting on the sweeper i bet. looks like its attached to the board material under. now i just gotta find one. i also found out it mounts to my tb. kinda ghetto like, you use washers and the stock mounting. the washer holds it down with the screws, but the screw doesnt go thru the tabs.

 

The 280ZX sensor is an off/on switch whereas the 240SX is an actual TPS (poteniometer). It seems like the 240SX has a few variations for the sensor (and the TB as well) - some have both the pig tail and the 280ZX style plug and others just the pigtail. They both mount the same way with the ears so I'm not sure why the sensors wouldn't be interchangeable.

Wish there was a bridge between the two of us - I'd definately give you hand setting up your system since that's the road I'm going down. I've got my MSIII built and runing with the stimulator. I've hooked up all the stock S130 sensors on the bench and it seems to work fine too... Just wiring up an adapter to plug the MS into the stock turbo harness....

 

^^^ What the! Post pics / info! (unless you are trying to keep it top secret).

 

I should clarify a little on the TPS. The ears on the 280ZX are farther apart than the 240SX so you would need to make a little plate or extensions on the arms - fairly straight forward. The 240SX TPS with the plug and pigtail will plug directly into the stock harness though and most importantly they all have the same d-shaped shaft input for the throttle body shaft....

Oh and I started going through the FSM and the MSIII (which is probably very similar if not the same as the MSII) and wiring the adapter up. It is possible to wire the AFM up as a TPS..... dunno if that's a good idea if you wanted to test the unit with the stock harness... otherwise the AFM is just another drag on the intake.

 

yeah that dang ferry between us is expensive and a pain. the brother in law is a pilot, but those cost lots to run as well. yeah i ripped out the stock harness as it was just faster and easier for me. plus the db37 connector and single harness looks cleaner than the stock harness. im actually following the throttle linkage for routing to keep everything looking clean

 

Here's the first prototype - it's rough but it should work to plug into the stock N/A harness...

 

Rough? It looks awesome! I'm to do this to mine once I get my tax return, I would appreciate a write-up when you're done.

 

No problem. Are you running NA or Turbo? I'll do a set up for the turbo harness as well. I've got an old 200SX ECU which is the same plug configuration as the 280ZXT.... the one above is from a Maxima which apparently doesn't use the cold air idle valve on pin 23....

 

N/A thanks, I a lot!

 

well got the ms all wired up. only problem is the ecu isnt connecting to my computer. trying to get some info from diy to figure out what it is. it may be a download i dont have or something. there is some ini file or a configuration that isnt right. i thought you just downloaded megatune or tunerstudio and away you went, but apparently not. i had it working for 15 minutes but i tunred it off and went to bed thinking i had fixed it, guess not

 

^^^ MSnS connects via USB right? When connected, do you have any hardware warnings in your Device Manager? Or does the USB display by the clock show a warning when connected?

I've been using a serial connection for my BMW and it requires the comm ports to be set / modified in a certain way.

 

i ended up installing the software package from diyautotune. it includes extra software that automatically detects what version of ecu you have and now tunerstudio works. but still not megatune, thats ok i only need one. it turns out there are ini files that are specific to the many options of ms. now i just need to get that dang tps and a t-stat gasket. then i can start trying to get it started. i played with the stim board and everything works. im still learning and reading, its starting to make my eyes bleed

 

Make sure you have the latest firmware upgrades as well - that's super important and of course the latest version of Tuner Studio...