Replacing stock L-Jetronic TPS for Micro/Megasquirt - Alfa Romeo Bulletin Board & Forums

 
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post #1 of 9 (permalink) Old 09-16-2016, 08:14 AM Thread Starter
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Question Replacing stock L-Jetronic TPS for Micro/Megasquirt

Hey All!

I'm in the process of converting over to an MS fuel management system right now and one of my biggest issues right now is finding out if there is a bolt on Throttle position sensor that would work in place of the Throttle position switch that is on the original L-Jet setups. I've seen people post about a bracket install for a TPS but the threads were so old that I don't know if anyone has that file anymore for me to fabricate it.

Any thoughts?
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post #2 of 9 (permalink) Old 09-16-2016, 08:41 AM
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TPS will be one of the easiest things to take care of for a MS install, so if that's your "biggest issue" I'm quite envious.

I don't have a part number right now but can get one. There are several 3-wire TPS that will bolt to the original location with no modification necessary.

Rob
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post #3 of 9 (permalink) Old 09-16-2016, 09:33 AM
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Al Mitchel - Reale made my bracket, powder coated it and supplied the TPS (Volvo, I think). Lots on information here: Installed Megasquirt today

Ed Prytherch
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post #4 of 9 (permalink) Old 09-16-2016, 09:40 AM Thread Starter
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Well, I'm not going to lie and say everything has gone perfectly so far. And actually this really is the least of my worries now, but I might as well start trying to find it.

Wiring is basically complete (with TP switch installed) and aside from the O2 sensor not getting signal everything else has been a go and I've gotten the car start and running, albeit very rough. Car was misfiring and not holding idle so I was getting ready to rotate the engine over to get to TDC for a realignment of the dist cap to make sure timing is good and during the process of removing the spark plugs... one broke.

So now I'm in a bind as a cracked ceramic portion of my spark plug decided to drop into a cylinder, (yay).

Hoping I can get that completely sorted out this weekend with the arrival of a new borescope and some macguyvered tools.

So yes, TPS is definitely not biggest issue, but I wanted to get an answer before I forgot out it again.

Any help on ANY of these issues would be great! haha

BTW, I'm going from 1980 Spica injected Spider, converting over to Microsquirt using a L-Jetronic TB and Injectors, Fuel only for not until I can figure out a Crank sensor set up. Project started when the head gasket blew and I was already tearing everything down and had a donor car for all of the EFI conversion parts. Will post pictures at some point once I get this Frankenstein's monster alive again.
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post #5 of 9 (permalink) Old 09-17-2016, 05:04 AM
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What Ed mentions above is probably the easiest. I know (and have) a TPS from a Porsche 944 Turbo will bolt up with no adaptors but the problem with it is it is a 5 pin connector instead of the 3 pin. I was never able to find the connector to convert (didn't really look that hard) so never used it. The TPS from some mid 80's to early 90's (can't remember exact range) Volvo's work fine but do require an adapter plate. That is what I'm using now, built my own adapter plate out of a hunk of aluminum that I had laying around. I was able to pick up a few TPS's from a pick-n-pull for less than $10 total.

Kevin

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post #6 of 9 (permalink) Old 09-18-2016, 03:35 PM
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Hardly a big issue

Look at the photos and you see how to do it! 5 holes in an adapted 3mm aluminium plate, a cut out for the connector and thats it!

I think you can do this!

G.
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post #7 of 9 (permalink) Old 10-01-2016, 03:00 PM
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if i am not mistaken the jetronic has a 3 position tps, but the mega. needs a variable resistance tps.their should be loads of those available.
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post #8 of 9 (permalink) Old 10-01-2016, 03:23 PM
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The unit you see installed above is a potentiometer installed instead of the switch which was there before.

Showing how to install it was the intention!
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post #9 of 9 (permalink) Old 10-01-2016, 03:44 PM
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Quote:
Originally Posted by Gabor K. View Post
The unit you see installed above is a potentiometer installed instead of the switch which was there before.

Showing how to install it was the intention!
yes of course.a potentiometer or as i called it a veriable resistor.
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