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Posted by: bd1308 Oct 11 2006, 05:52 PM

Did the 1975 L-Jet system have the throttle position sensor? I am using a bus system rigth now and it actually does not have such sensor, but the idle is ROCK SOLID.

Posted by: Marty Yeoman Oct 11 2006, 06:12 PM

Yes, it has a throttle position sensor.
It acts more like a switch.
It only senses WOT.
Nothing but WOT.

Posted by: bd1308 Oct 11 2006, 06:15 PM

INtresting, so no idle contacts too. My 74 one had two sets, one for idle and one for WOT. I was ready to put the TPS on...wheres the connector? It wasnt there.

Posted by: jd66921 Oct 11 2006, 06:23 PM

I have an idle sensor on my '75 914, but I don't know what it does
beyond what the manual says.

Jeff

Posted by: bd1308 Oct 11 2006, 06:26 PM

Intresting, VERY intresting.

Posted by: jd66921 Oct 11 2006, 06:37 PM

What are you plottimg?

Posted by: Mueller Oct 11 2006, 06:56 PM

according to this site: http://www.ratwell.com/technical/FISwap.html, some years of the buses had no TPS...some had a microswitch on the TB and some had neither....

you might end up running lean at WOT...something that might not have been a concern with the buses????

Posted by: bd1308 Oct 11 2006, 07:01 PM

I spend like 1.2% of my time at WOT

Posted by: ClayPerrine Oct 11 2006, 09:12 PM

All of the L-Jet systems used on 914s had a throttle switch, and they all had contacts for wide open throttle and idle.

The 912E didn't have one of the contacts, IIRC it was the WOT contact, but I am not positive.

Posted by: Bleyseng Oct 11 2006, 09:14 PM

On my 77 Westy, I think its all in the AFM as there are traces inside like a TPS. Nope, it doesn't run lean at WOT as it adjusts and set the AFR correctly.

Its a good alternative to Djet and could be adapted for use on a FI on the cheap set up.