BlownCorona Posted June 8, 2015 Share Posted June 8, 2015 hello all i would like to ask the opinion of OS on how i might go about adding a throttle position sensor to my engine. i cant really see any nice, and proper way of doing it without risking a lot of cumulative error which really would void the reason of even installing a tps and converting to computer ignition. these are the only pictures i have at the moment, but unfortunately the throttle shaft doesn't protrude out either end, and there isn't a great deal i can do in between the carbs. my best idea so far is to shape the end of the mid point throttle shaft that's bolted to the rocker cover and fit it to this assembly. however is a left over from the original carb, and the throttle cable is attached to this in a pretty hory way, i had intentions of eventually binning the whole lot and converting it to run a proper cable from the pedal. Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted June 8, 2015 Share Posted June 8, 2015 Put it on the throttle pedal itself 1 Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 8, 2015 Author Share Posted June 8, 2015 that would result in quite a difference between what the sensor reads at the pedal to what the throttle plates are doing. even being a few degrees different would be enough to throw it all out of wack id say. also the throttle pedal wont lend well do having anything mounted to it unfortunately Quote Link to comment Share on other sites More sharing options...
fletch Posted June 8, 2015 Share Posted June 8, 2015 What ecu are you running? I'm 95% sure that on 100% of aftermarket ecu's you hook up your tps Then set it at zero then mash the pedal and set it at 100%. Then it does not matter what ratio of mover it has relative to the actual butterfly opening. It is good to have as much sensor movement as you can for better resolution. 2 Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 8, 2015 Author Share Posted June 8, 2015 megasquirt, and your correct about the calibration. my main concern is the first 2-3 degrees of pedal movement that do nothing to the butterflys, while it takes up the slack in the cables and linkages. but this may not be such an issue since the only time that will be used it transitioning from idle to some sort of driving. im new to ecus and stuff like this so i dont really know whats important or an issue or not. Quote Link to comment Share on other sites More sharing options...
sluggy Posted June 8, 2015 Share Posted June 8, 2015 what about a bellcrank and use a linear potentiometer, might take a bit of searching to get the right stroke and fit Im guessing. no inuendo intended. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 8, 2015 Author Share Posted June 8, 2015 you did touch on my other concern i forgot to mention. if i did mount it to that shaft thats on the rocker cover. it only rotates about 60-70 degrees. ive got a random TPS of some toyota 4wd here and 3/5ths of how much that one turns. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 8, 2015 Author Share Posted June 8, 2015 oh linear potentiometers look cool im not sure if they will interface properly with the ecu thats expecting to see a voltage change. Edit - cant find much in the way of a slide potentiometer that would be suitable for engine bay use on the nice side of $250 Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 8, 2015 Author Share Posted June 8, 2015 . Quote Link to comment Share on other sites More sharing options...
sentra Posted June 8, 2015 Share Posted June 8, 2015 you allready know this but im giving it a vote anyway cut drill/tap the end of the shaft, drill/tap a spigot, stud+epoxy them together, file flats to accept tps? (yeah you gotta drill a hole in the carb) those carbs only take a moment to pull the end one off. 1 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted June 8, 2015 Share Posted June 8, 2015 Slide potentiometers are crap, just go to a wrecker and raid the tps off a electronic throttle car and use that. The ecu will compensate for the rest. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 9, 2015 Author Share Posted June 9, 2015 anyone know of a common car that has a TPS. with the drive hole that goes right though? like this, but something i could hope to find at a wrecker. otherwise ill just have to suck it up and spend the money Quote Link to comment Share on other sites More sharing options...
Threeonthetree Posted June 10, 2015 Share Posted June 10, 2015 Fliboi are you still in Auckland? Take a trip to Zebra U Pick or Pick A Part and you'll be sure to find something. Quote Link to comment Share on other sites More sharing options...
Bangbug Posted June 10, 2015 Share Posted June 10, 2015 What ecu are you running? I'm 95% sure that on 100% of aftermarket ecu's you hook up your tps Then set it at zero then mash the pedal and set it at 100%. Then it does not matter what ratio of mover it has relative to the actual butterfly opening. It is good to have as much sensor movement as you can for better resolution. I vote for this for an easy mod. 2-3% from idle transition is nothing unless you're transitioning into this area from idle and need ignition control there.... but what do you expect to do with the ignition in this area? Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 10, 2015 Author Share Posted June 10, 2015 yup still in auckland. am away this weekend, but on nights next week so hope to get down to zebra at some point. and ive come to the conclusion, with help from here, that it wont be too much of an issue for the ecu to collaborate to the car. Quote Link to comment Share on other sites More sharing options...
downtrail Posted June 10, 2015 Share Posted June 10, 2015 Yep your table will be 12x12 so youll have it set at 9% intervills to get max table usage so having a little slop isnt the end of the world. It will be if you go injected as it itll miss sudden changes to add on extra fuel for acc enrichement. 1 Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 10, 2015 Author Share Posted June 10, 2015 it will be staying carbs. even though ill have the capability, im just not interested in it for this particular car so that wont be an issue Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 20, 2015 Author Share Posted June 20, 2015 finally got a chance to go poke around pick a part today. in the rain no less! settled on this bmw e36 TPS. nice and small and doesnt look ugly, and dime a dozen, they also have a very nice plug and locking system, plus i used to work for bmw parts, so if i ever need a brand new one i should be able to swing a deal! 1 Quote Link to comment Share on other sites More sharing options...
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