just give me a limp home mode with a 300 load setting and I will be happy..

 

lol.

 

No TPS=Carb or mechanical injection. Not seeing any benefits at all.

 

no idle switch on 7/8/9 tps

 

I've seen instances on older speed density vehicles where they used TPS only and no pressure sensor in order to run the car (and I also used it for my old ITB Honda's with a predetermined cutoff point to switch back to the MAP ), but not the other way around. Usually TPS is an essential part of making the vehicle run correctly.

I'd be more concerned about how to make an adapter so the TPS will fit the throttle body. Perhaps even as far as trying a different TPS with the same resistance range?

 

Yeah thats Alpha N Slo. Just fuel vs tps and rpm. Great at one elevation but its basically the electronic version of rochester mechanical injection.

 

well the MEgatune (megasquirt tuning software) used to have only TPSDOT option, that was used to determine teh acceleration enrichment and such issues, then the next update they added the option of having MAPDOT where we were able to run the car without a TPS reference just using MAP as a reference and tune the AE according to that.
and in reference to speed density, many of the BMW tuning companies that do sell supercharger kits for the BMW N/A cars, are including bigger injectors with the kit, and an Alfa-N software where they are eliminating the MAS, I have seen it on 3 cars, E36 M3, and E46 M3, both running 440cc injectors, 5bar FPR (Stock unit) MAS removed and AFR is pretty good Under and Off boost, idle is fine as well.
off boost 14-15:1 and under boost 12-11:1, I know some would say not smart, we maybe its not, but it is working. and the E46 runs 7psi, the E36 runs 10psi stock engine etc...
we also had an E46 328ci that was supercharged as well, but that kit from germany included a pretuned piggyback to adjust the afr, with that unit we had more issues than with the M3 cars (kits from USA).

NAB

 

TPSDOT = changes to the TPS
MAPDOT= changes to the MAP
One of the issues with 100% MAPDOT is changes to the MAP sensor can sometimes lag a bit compared to the TPS. One of the issues with 100% TPSDOT is that it doesn't quite know when it's finished acceling or deceling, so it's just based on a decaying timer. Megasquirt is capable of using both TPSDOT and MAPDOT, and uses an adjustable percentage between the two. I think a better benefit to those running different throttle bodies is the ability to calibrate a different TPS signal.

 

It seems like the primary focus on this should be more of dealing with the conditions that are dependent on TPS. Being able to tune the TPS tables would allow the user to use other TPS sensors, should they use something like a Q45 throttle body. They could accomodate the Q45 TPS voltage range instead of trying to fit a Mitsu TPS to the throttle body.

A patch that converted the input voltage to a voltage compatible with the Mitsu range would probably get the job done.

 

Great idea....It would be something similar to the patches seen in the SD conversion. Once the tables are set up it is just a matter of tweaking the settings.

And...a Q45 throttle body is huge compared to ours.

 

I bought my DSM with a bad TPS. Threw an error code. Checked with a DMM, resistance was infinite between two of the pins. Most I've ever spent for a potentiometer...

 

The Q45 throttle body might even work. I had three TPS's to use on my DSM w/evo ecu this past weekend, all of them were slightly different but above 5K from the two outer terminals (so its a 5k potentiometer as to limit current draw). All three ended up working and sending a 0-5 volt signal back to the ecu. The ecu sets up the low and high voltages (ground and ecu sensor voltage) and the center tap on the TPS just gives a range from 0-5 depending on angle. I'm pretty sure that as long as the TPS is above 4kohm and is a 3 pin potientiometer style like a DSM/Evo it should work fine. If not, it is easy enough to make one fit. Just use the DSM/Evo throttle body shaft, chop it to length, and fit it to the end of the Q45 piece. Make a fixture to hold the potentiometer and you are golden.

Also the 1g DSM ecu does not have TPS based maps if it loosed MAF signal. So basically what happens is the car shuts off if it looses MAF signal. Not it sputters and dies, no the car shuts off. You are stranded and you go nowhere. Blow an IC pipe and you are stranded until you fix it.

 

Yes, to a certain degree. The beauty of the tuning program (Crome) was it allowed you to set it for Alpha N-type SD until a certain throttle percentage, and then switch back to standard MAP SD for finer control, and still use the barometric and IAT corrections applied to both standard and Alpha N calculations. It was the only good way we could control ITB's on a Honda motor so they would behave and be a little more "street friendly".